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    SubjectRe: [PATCH V2 0/3] drivers/staging: zcache: dynamic page cache/swap compression
    From
    On Mon, Feb 14, 2011 at 1:29 AM, Matt <jackdachef@gmail.com> wrote:
    > On Mon, Feb 14, 2011 at 1:24 AM, Matt <jackdachef@gmail.com> wrote:
    >> On Mon, Feb 14, 2011 at 12:08 AM, Matt <jackdachef@gmail.com> wrote:
    >>> On Wed, Feb 9, 2011 at 1:03 AM, Dan Magenheimer
    >>> <dan.magenheimer@oracle.com> wrote:
    >>> [snip]
    >>>>
    >>>> If I've missed anything important, please let me know!
    >>>>
    >>>> Thanks again!
    >>>> Dan
    >>>>
    >>>
    >>> Hi Dan,
    >>>
    >>> thank you so much for answering my email in such detail !
    >>>
    >>> I shall pick up on that mail in my next email sending to the mailing list :)
    >>>
    >>>
    >>> currently I've got a problem with btrfs which seems to get triggered
    >>> by cleancache get-operations:
    >>>
    >>>
    >>> Feb 14 00:37:19 lupus kernel: [ 2831.297377] device fsid
    >>> 354120c992a00761-5fa07d400126a895 devid 1 transid 7
    >>> /dev/mapper/portage
    >>> Feb 14 00:37:19 lupus kernel: [ 2831.297698] btrfs: enabling disk space caching
    >>> Feb 14 00:37:19 lupus kernel: [ 2831.297700] btrfs: force lzo compression
    >>> Feb 14 00:37:19 lupus kernel: [ 2831.315844] zcache: created ephemeral
    >>> tmem pool, id=3
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853188] BUG: unable to handle
    >>> kernel paging request at 0000000001400050
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853219] IP: [<ffffffff8133ef1b>]
    >>> btrfs_encode_fh+0x2b/0x120
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853242] PGD 0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853251] Oops: 0000 [#1] PREEMPT SMP
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853275] last sysfs file:
    >>> /sys/devices/platform/coretemp.3/temp1_input
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853295] CPU 4
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853303] Modules linked in: radeon
    >>> ttm drm_kms_helper cfbcopyarea cfbimgblt cfbfillrect ipt_REJECT
    >>> ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc nf_conntrack_irc
    >>> nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp
    >>> iptable_filter ipt_addrtype xt_DSCP xt_dscp xt_iprange ip_tables
    >>> ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit xt_conntrack xt_mark
    >>> xt_multiport xt_connmark nf_conntrack xt_string ip6_tables x_tables
    >>> it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss snd_seq_midi_event
    >>> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_hda_codec_hdmi
    >>> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm
    >>> snd_timer snd soundcore i2c_i801 wmi e1000e shpchp snd_page_alloc
    >>> libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb usb_storage
    >>> ehci_hcd [last unloaded: tg3]
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853682]
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853690] Pid: 11394, comm:
    >>> btrfs-transacti Not tainted 2.6.37-plus_v16_zcache #4 FMP55/ipower
    >>> G3710
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853725] RIP:
    >>> 0010:[<ffffffff8133ef1b>]  [<ffffffff8133ef1b>]
    >>> btrfs_encode_fh+0x2b/0x120
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853751] RSP:
    >>> 0018:ffff880129a11b00  EFLAGS: 00010246
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853767] RAX: 00000000000000ff
    >>> RBX: ffff88014a1ce628 RCX: 0000000000000000
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853788] RDX: ffff880129a11b3c
    >>> RSI: ffff880129a11b70 RDI: 0000000000000006
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853808] RBP: 0000000001400000
    >>> R08: ffffffff8133eef0 R09: ffff880129a11c68
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853829] R10: 0000000000000001
    >>> R11: 0000000000000001 R12: ffff88014a1ce780
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853849] R13: ffff88021fefc000
    >>> R14: ffff88021fef9000 R15: 0000000000000000
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853870] FS:
    >>> 0000000000000000(0000) GS:ffff8800bf500000(0000)
    >>> knlGS:0000000000000000
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853894] CS:  0010 DS: 0000 ES:
    >>> 0000 CR0: 000000008005003b
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853911] CR2: 0000000001400050
    >>> CR3: 0000000001c27000 CR4: 00000000000006e0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853932] DR0: 0000000000000000
    >>> DR1: 0000000000000000 DR2: 0000000000000000
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853952] DR3: 0000000000000000
    >>> DR6: 00000000ffff0ff0 DR7: 0000000000000400
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853973] Process btrfs-transacti
    >>> (pid: 11394, threadinfo ffff880129a10000, task ffff880202e4ac40)
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.853999] Stack:
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854006]  ffff880129a11b50
    >>> ffff880000000003 ffff88003c60a098 0000000000000003
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854035]  ffffffffffffffff
    >>> ffffffff810e6aaa 0000000000000000 0000000602e4ac40
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854063]  ffffffff8133e3f0
    >>> ffffffff810e6cee 0000000000001000 0000000000000000
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854092] Call Trace:
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854103]  [<ffffffff810e6aaa>] ?
    >>> cleancache_get_key+0x4a/0x60
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854122]  [<ffffffff8133e3f0>] ?
    >>> btrfs_wake_function+0x0/0x20
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854140]  [<ffffffff810e6cee>] ?
    >>> __cleancache_flush_inode+0x3e/0x70
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854161]  [<ffffffff810b34d2>] ?
    >>> truncate_inode_pages_range+0x42/0x440
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854182]  [<ffffffff812f115e>] ?
    >>> btrfs_search_slot+0x89e/0xa00
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854201]  [<ffffffff810c3a45>] ?
    >>> unmap_mapping_range+0xc5/0x2a0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854220]  [<ffffffff810b3930>] ?
    >>> truncate_pagecache+0x40/0x70
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854240]  [<ffffffff813458b1>] ?
    >>> btrfs_truncate_free_space_cache+0x81/0xe0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854261]  [<ffffffff812fce15>] ?
    >>> btrfs_write_dirty_block_groups+0x245/0x500
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854283]  [<ffffffff812fcb6a>] ?
    >>> btrfs_run_delayed_refs+0x1ba/0x220
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854304]  [<ffffffff8130afff>] ?
    >>> commit_cowonly_roots+0xff/0x1d0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854323]  [<ffffffff8130c583>] ?
    >>> btrfs_commit_transaction+0x363/0x760
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854344]  [<ffffffff81067ea0>] ?
    >>> autoremove_wake_function+0x0/0x30
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854364]  [<ffffffff81305bc3>] ?
    >>> transaction_kthread+0x283/0x2a0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854383]  [<ffffffff81305940>] ?
    >>> transaction_kthread+0x0/0x2a0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854401]  [<ffffffff81305940>] ?
    >>> transaction_kthread+0x0/0x2a0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854420]  [<ffffffff81067a16>] ?
    >>> kthread+0x96/0xa0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854437]  [<ffffffff81003514>] ?
    >>> kernel_thread_helper+0x4/0x10
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854455]  [<ffffffff81067980>] ?
    >>> kthread+0x0/0xa0
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854471]  [<ffffffff81003510>] ?
    >>> kernel_thread_helper+0x0/0x10
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854488] Code: 55 b8 ff 00 00 00
    >>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00
    >>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00
    >>> 48 89 06 84 c9 48 8b 85 68 fe ff ff
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854742] RIP  [<ffffffff8133ef1b>]
    >>> btrfs_encode_fh+0x2b/0x120
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854762]  RSP <ffff880129a11b00>
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.854773] CR2: 0000000001400050
    >>> Feb 14 00:39:20 lupus kernel: [ 2951.860906] ---[ end trace
    >>> f831c5ceeaa49287 ]---
    >>>
    >>> in my case I had compress-force with lzo and disk_cache enabled
    >>>
    >>>
    >>> another user of the kernel I'm currently running has had the same
    >>> problem with zcache
    >>> (http://forums.gentoo.org/viewtopic-p-6571799.html#6571799)
    >>>
    >>> (looks like in his case compression and any other fancy additional
    >>> features weren't enabled)
    >>>
    >>>
    >>> changes made by this kernel or patchset to btrfs are from
    >>> * io-less dirty throttling patchset (44 patches)
    >>> * zcache V2 ("[PATCH] staging: zcache: fix memory leak" should be
    >>> applied in both cases)
    >>> * PATCH] fix (latent?) memory corruption in btrfs_encode_fh()
    >>> * btrfs-unstable changes to state of
    >>> 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6 (so practically equals btrfs
    >>> from 2.6.38-rc4+)
    >>>
    >>> I haven't tried downgrading to vanilla 2.6.37 with zcache only, yet,
    >>>
    >>> but kind of upgraded btrfs to the latest state of the btrfs-unstable
    >>> repository (http://git.eu.kernel.org/?p=linux/kernel/git/mason/btrfs-unstable.git;a=summary)
    >>> namely 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6
    >>>
    >>> this also didn't help and seemed to produce the same error-message
    >>>
    >>> so to summarize:
    >>>
    >>> 1) error message appearing with all 4 patchsets applied changing
    >>> btrfs-code and compress-force=lzo and disk_cache enabled
    >>>
    >>> 2) error message appearing with default mount-options and btrfs from
    >>> 2.6.37 and changes for zcache & io-less dirty throttling patchset
    >>> applied (first 2 patch(sets)) from list)
    >>>
    >>>
    >>> in my case I tried to extract / play back a 1.7 GiB tarball of my
    >>> portage-directory (lots of small files and some tar.bzip2 archives)
    >>> via pbzip2 or 7z when the error happened and the message was shown
    >>>
    >>> Due to KMS sound (webradio streaming) was still running but I couldn't
    >>> continue work (X switching to kernel output) so I did the magic sysrq
    >>> combo (reisub)
    >>>
    >>>
    >>> Does that BUG message ring a bell for anyone ?
    >>>
    >>> (if I should leave out anyone from the CC in the next emails or
    >>> future, please holler - I don't want to spam your inboxes)
    >>>
    >>> Thanks
    >>>
    >>> Matt
    >>>
    >>
    >>
    >> OK,
    >>
    >> here's the output of a kernel -
    >>
    >> staying as close to vanilla (2.6.37) as the current situation allows
    >> (only including some corruption or leak fixes for zram & zcache and
    >> "zram_xvmalloc: 64K page fixes and optimizations" (and 2 reiserfs
    >> fixes)):
    >>
    >> so in total the following patches are included in this new kernel
    >> (2.6.37-zcache):
    >>
    >> zram changes:
    >> 1 zram: Fix sparse warning 'Using plain integer as NULL pointer'
    >> 2 [PATCH] zram: fix data corruption issue
    >> 3 [PATCH 0/7][v2] zram_xvmalloc: 64K page fixes and optimizations
    >>
    >> zcache:
    >> 1 zcache-linux-2.6.37-110205
    >> 2 [PATCH] staging: zcache: fix memory leak
    >> 3 [PATCH] zcache: Fix build error when sysfs is not defined
    >>
    >> reiserfs:
    >> 1 [PATCH] reiserfs: Make sure va_end() is always called after
    >> 2 [patch] reiserfs: potential ERR_PTR dereference
    >>
    >>
    >> the same procedure:
    >>
    >> trying to extract the mentioned portage-tarball:
    >>
    >> time (7z e -so -tbzip2 -mmt=5 /system/portage_backup_022011.tbz2 | tar
    >> -xp -C /usr/gentoo/)
    >>
    >>
    >> this hopefully should make it easier to track down the problem:
    >>
    >>
    >> Feb 14 01:59:59 lupus kernel: [  364.777143] device fsid
    >> 684a4213565dd3fe-ca991821badc2aac devid 1 transid 7
    >> /dev/mapper/portage
    >> Feb 14 01:59:59 lupus kernel: [  364.844994] zcache: created ephemeral
    >> tmem pool, id=2
    >> Feb 14 02:02:49 lupus kernel: [  534.577573] BUG: unable to handle
    >> kernel paging request at 0000000037610050
    >> Feb 14 02:02:49 lupus kernel: [  534.577605] IP: [<ffffffff81338cbb>]
    >> btrfs_encode_fh+0x2b/0x110
    >> Feb 14 02:02:49 lupus kernel: [  534.577630] PGD 0
    >> Feb 14 02:02:49 lupus kernel: [  534.577640] Oops: 0000 [#1] PREEMPT SMP
    >> Feb 14 02:02:49 lupus kernel: [  534.577665] last sysfs file:
    >> /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
    >> Feb 14 02:02:49 lupus kernel: [  534.577693] CPU 5
    >> Feb 14 02:02:49 lupus kernel: [  534.577701] Modules linked in: radeon
    >> ttm drm_kms_helper cfbcopyarea cfbimgblt cfbfillrect ipt_REJECT
    >> ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc nf_conntrack_irc
    >> nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp
    >> iptable_filter ipt_addrtype xt_DSCP xt_dscp xt_iprange ip_tables
    >> ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit xt_conntrack xt_mark
    >> xt_multiport xt_connmark nf_conntrack xt_string ip6_tables x_tables
    >> it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss snd_seq_midi_event
    >> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_hda_codec_hdmi
    >> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm
    >> snd_timer snd e1000e soundcore i2c_i801 shpchp snd_page_alloc wmi
    >> libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb usb_storage
    >> ehci_hcd [last unloaded: tg3]
    >> Feb 14 02:02:49 lupus kernel: [  534.578114]
    >> Feb 14 02:02:49 lupus kernel: [  534.578124] Pid: 8285, comm: tar Not
    >> tainted 2.6.37-zcache #2 FMP55/ipower G3710
    >> Feb 14 02:02:49 lupus kernel: [  534.578146] RIP:
    >> 0010:[<ffffffff81338cbb>]  [<ffffffff81338cbb>]
    >> btrfs_encode_fh+0x2b/0x110
    >> Feb 14 02:02:49 lupus kernel: [  534.578172] RSP:
    >> 0018:ffff88023ea9dcc8  EFLAGS: 00010246
    >> Feb 14 02:02:49 lupus kernel: [  534.578189] RAX: 00000000000000ff
    >> RBX: ffff8800b8643228 RCX: 0000000000000000
    >> Feb 14 02:02:49 lupus kernel: [  534.578210] RDX: ffff88023ea9dd04
    >> RSI: ffff88023ea9dd38 RDI: 0000000000000006
    >> Feb 14 02:02:49 lupus kernel: [  534.578230] RBP: 0000000037610000
    >> R08: ffffffff81338c90 R09: 0000000000000000
    >> Feb 14 02:02:49 lupus kernel: [  534.578251] R10: 0000000000000019
    >> R11: 0000000000000001 R12: ffff8800b8643380
    >> Feb 14 02:02:49 lupus kernel: [  534.578272] R13: ffff8800b8643258
    >> R14: 00007fff806f1f00 R15: 0000000000000000
    >> Feb 14 02:02:49 lupus kernel: [  534.578293] FS:
    >> 00007f823d7ed700(0000) GS:ffff8800bf540000(0000)
    >> knlGS:0000000000000000
    >> Feb 14 02:02:49 lupus kernel: [  534.578317] CS:  0010 DS: 0000 ES:
    >> 0000 CR0: 0000000080050033
    >> Feb 14 02:02:49 lupus kernel: [  534.578334] CR2: 0000000037610050
    >> CR3: 000000023dcef000 CR4: 00000000000006e0
    >> Feb 14 02:02:49 lupus kernel: [  534.578356] DR0: 0000000000000000
    >> DR1: 0000000000000000 DR2: 0000000000000000
    >> Feb 14 02:02:49 lupus kernel: [  534.578377] DR3: 0000000000000000
    >> DR6: 00000000ffff0ff0 DR7: 0000000000000400
    >> Feb 14 02:02:49 lupus kernel: [  534.578398] Process tar (pid: 8285,
    >> threadinfo ffff88023ea9c000, task ffff88023e8b9d40)
    >> Feb 14 02:02:49 lupus kernel: [  534.578421] Stack:
    >> Feb 14 02:02:49 lupus kernel: [  534.578428]  000000013d096000
    >> ffff88023ed84800 ffff88023ea9c000 0000000000000002
    >> Feb 14 02:02:49 lupus kernel: [  534.578458]  ffffffffffffffff
    >> ffffffff810e3b1a 0000000000000001 000000061e1d5240
    >> Feb 14 02:02:49 lupus kernel: [  534.578486]  fffffffffffffffb
    >> ffffffff810e3d5e ffff88010f383000 0000001ab86cb908
    >> Feb 14 02:02:49 lupus kernel: [  534.578514] Call Trace:
    >> Feb 14 02:02:49 lupus kernel: [  534.578525]  [<ffffffff810e3b1a>] ?
    >> cleancache_get_key+0x4a/0x60
    >> Feb 14 02:02:49 lupus kernel: [  534.578544]  [<ffffffff810e3d5e>] ?
    >> __cleancache_flush_inode+0x3e/0x70
    >> Feb 14 02:02:49 lupus kernel: [  534.578565]  [<ffffffff810b0ed2>] ?
    >> truncate_inode_pages_range+0x42/0x440
    >> Feb 14 02:02:49 lupus kernel: [  534.578586]  [<ffffffff81338451>] ?
    >> btrfs_tree_unlock+0x41/0x50
    >> Feb 14 02:02:49 lupus kernel: [  534.578605]  [<ffffffff812e4ed5>] ?
    >> btrfs_release_path+0x15/0x70
    >> Feb 14 02:02:49 lupus kernel: [  534.578624]  [<ffffffff8130bf29>] ?
    >> btrfs_run_delayed_iputs+0x49/0x120
    >> Feb 14 02:02:49 lupus kernel: [  534.578644]  [<ffffffff813107e7>] ?
    >> btrfs_evict_inode+0x27/0x1e0
    >> Feb 14 02:02:49 lupus kernel: [  534.578663]  [<ffffffff810fc3aa>] ?
    >> evict+0x1a/0xa0
    >> Feb 14 02:02:49 lupus kernel: [  534.578678]  [<ffffffff810fc6bd>] ?
    >> iput+0x1cd/0x2b0
    >> Feb 14 02:02:49 lupus kernel: [  534.578694]  [<ffffffff810f266f>] ?
    >> do_unlinkat+0x12f/0x1d0
    >> Feb 14 02:02:49 lupus kernel: [  534.578712]  [<ffffffff810027bb>] ?
    >> system_call_fastpath+0x16/0x1b
    >> Feb 14 02:02:49 lupus kernel: [  534.578730] Code: 55 b8 ff 00 00 00
    >> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00
    >> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00
    >> 48 89 06 84 c9 48 8b 85 68 fe ff ff
    >> Feb 14 02:02:49 lupus kernel: [  534.578986] RIP  [<ffffffff81338cbb>]
    >> btrfs_encode_fh+0x2b/0x110
    >> Feb 14 02:02:49 lupus kernel: [  534.579081]  RSP <ffff88023ea9dcc8>
    >> Feb 14 02:02:49 lupus kernel: [  534.579093] CR2: 0000000037610050
    >> Feb 14 02:02:49 lupus kernel: [  534.587513] ---[ end trace
    >> c596b12e66c0b360 ]---
    >>
    >>
    >> for reference I've pasted it to pastebin.com:
    >>
    >> "2.6.37_zcache_V2.patch"
    >> http://pastebin.com/cVSkwQ6M
    >>
    >>
    >>
    >>
    >>
    >> after the reboot I had forgotten to not mount the btrfs volume and it
    >> threw a similar error-message again and remounted several partitions
    >> read-only (including the system partition)
    >> the partition with btrfs (/usr/gentoo) couldn't be unmounted since the
    >> umount process kind of hang
    >>
    >> so here's the error message after a reboot (might not be accurate or
    >> kind of "skewed" since other patches are included (io-less dirty
    >> throttling, PATCH] fix (latent?) memory corruption in
    >> btrfs_encode_fh() and latest changes for btrfs)) but might help to get
    >> some more evidence:
    >>
    >>
    >> Feb 14 02:05:46 lupus kernel: [   63.922648] device fsid
    >> 684a4213565dd3fe-ca991821badc2aac devid 1 transid 13
    >> /dev/mapper/portage
    >> Feb 14 02:05:46 lupus kernel: [   64.047118] btrfs: unlinked 1 orphans
    >> Feb 14 02:05:46 lupus kernel: [   64.051956] zcache: created ephemeral
    >> tmem pool, id=3
    >> Feb 14 02:05:48 lupus kernel: [   65.801364] hub 2-1:1.0: hub_suspend
    >> Feb 14 02:05:48 lupus kernel: [   65.801376] usb 2-1: unlink
    >> qh256-0001/ffff88023fefd180 start 1 [1/0 us]
    >> Feb 14 02:05:48 lupus kernel: [   65.801559] usb 2-1: usb auto-suspend
    >> Feb 14 02:05:50 lupus kernel: [   67.797929] hub 2-0:1.0: hub_suspend
    >> Feb 14 02:05:50 lupus kernel: [   67.797939] usb usb2: bus auto-suspend
    >> Feb 14 02:05:50 lupus kernel: [   67.797942] ehci_hcd 0000:00:1d.0:
    >> suspend root hub
    >> Feb 14 02:05:52 lupus kernel: [   70.050493] BUG: unable to handle
    >> kernel paging request at 0000030341ed0050
    >> Feb 14 02:05:52 lupus kernel: [   70.050670] IP: [<ffffffff8133ef1b>]
    >> btrfs_encode_fh+0x2b/0x120
    >> Feb 14 02:05:52 lupus kernel: [   70.050807] PGD 0
    >> Feb 14 02:05:52 lupus kernel: [   70.050929] Oops: 0000 [#1] PREEMPT SMP
    >> Feb 14 02:05:52 lupus kernel: [   70.051223] last sysfs file:
    >> /sys/module/pcie_aspm/parameters/policy
    >> Feb 14 02:05:52 lupus kernel: [   70.051365] CPU 6
    >> Feb 14 02:05:52 lupus kernel: [   70.051411] Modules linked in:
    >> ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc
    >> nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
    >> nf_conntrack_ftp iptable_filter ipt_addrtype xt_DSCP xt_dscp
    >> xt_iprange ip_tables ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit
    >> xt_conntrack xt_mark xt_multiport xt_connmark nf_conntrack xt_string
    >> ip6_tables x_tables it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss
    >> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss
    >> snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec
    >> snd_hwdep snd_pcm snd_timer snd i2c_i801 soundcore wmi shpchp e1000e
    >> snd_page_alloc libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb
    >> usb_storage ehci_hcd [last unloaded: tg3]
    >> Feb 14 02:05:52 lupus kernel: [   70.054694]
    >> Feb 14 02:05:52 lupus kernel: [   70.054776] Pid: 7962, comm: umount
    >> Not tainted 2.6.37-plus_v16_zcache #4 FMP55/ipower G3710
    >> Feb 14 02:05:52 lupus kernel: [   70.054912] RIP:
    >> 0010:[<ffffffff8133ef1b>]  [<ffffffff8133ef1b>]
    >> btrfs_encode_fh+0x2b/0x120
    >> Feb 14 02:05:52 lupus kernel: [   70.055084] RSP:
    >> 0018:ffff88023c77d6f8  EFLAGS: 00010246
    >> Feb 14 02:05:52 lupus kernel: [   70.055173] RAX: 00000000000000ff
    >> RBX: ffff88023cde0168 RCX: 0000000000000000
    >> Feb 14 02:05:52 lupus kernel: [   70.055265] RDX: ffff88023c77d734
    >> RSI: ffff88023c77d768 RDI: 0000000000000006
    >> Feb 14 02:05:52 lupus kernel: [   70.055357] RBP: 0000030341ed0000
    >> R08: ffffffff8133eef0 R09: ffff88023c77d8d8
    >> Feb 14 02:05:52 lupus kernel: [   70.055448] R10: 0000000000000003
    >> R11: 0000000000000001 R12: 00000000ffffffff
    >> Feb 14 02:05:52 lupus kernel: [   70.055540] R13: ffff88023cde0030
    >> R14: ffffea0007dd39f0 R15: 0000000000000001
    >> Feb 14 02:05:52 lupus kernel: [   70.055633] FS:
    >> 00007fb1cad04760(0000) GS:ffff8800bf580000(0000)
    >> knlGS:0000000000000000
    >> Feb 14 02:05:52 lupus kernel: [   70.055762] CS:  0010 DS: 0000 ES:
    >> 0000 CR0: 000000008005003b
    >> Feb 14 02:05:52 lupus kernel: [   70.055851] CR2: 0000030341ed0050
    >> CR3: 000000023c7d5000 CR4: 00000000000006e0
    >> Feb 14 02:05:52 lupus kernel: [   70.055943] DR0: 0000000000000000
    >> DR1: 0000000000000000 DR2: 0000000000000000
    >> Feb 14 02:05:52 lupus kernel: [   70.056035] DR3: 0000000000000000
    >> DR6: 00000000ffff0ff0 DR7: 0000000000000400
    >> Feb 14 02:05:52 lupus kernel: [   70.056128] Process umount (pid:
    >> 7962, threadinfo ffff88023c77c000, task ffff88023c7a4260)
    >> Feb 14 02:05:52 lupus kernel: [   70.056257] Stack:
    >> Feb 14 02:05:52 lupus kernel: [   70.056338]  0000000000000000
    >> 0000000000000002 ffff880200000000 0000000000000003
    >> Feb 14 02:05:52 lupus kernel: [   70.056630]  ffffea0007dd39f0
    >> ffffffff810e6aaa ffff880200000041 0000000600000246
    >> Feb 14 02:05:52 lupus kernel: [   70.056922]  ffff88023cdcd300
    >> ffffffff810e6b3a 0000000000000001 ffffffff8132bb7c
    >> Feb 14 02:05:52 lupus kernel: [   70.057213] Call Trace:
    >> Feb 14 02:05:52 lupus kernel: [   70.057301]  [<ffffffff810e6aaa>] ?
    >> cleancache_get_key+0x4a/0x60
    >> Feb 14 02:05:52 lupus kernel: [   70.057393]  [<ffffffff810e6b3a>] ?
    >> __cleancache_get_page+0x7a/0xd0
    >> Feb 14 02:05:52 lupus kernel: [   70.057487]  [<ffffffff8132bb7c>] ?
    >> merge_state+0x7c/0x150
    >> Feb 14 02:05:52 lupus kernel: [   70.057579]  [<ffffffff8132e4de>] ?
    >> __extent_read_full_page+0x52e/0x710
    >> Feb 14 02:05:52 lupus kernel: [   70.057673]  [<ffffffff813bdea4>] ?
    >> rb_insert_color+0xa4/0x140
    >> Feb 14 02:05:52 lupus kernel: [   70.057766]  [<ffffffff8134b0b6>] ?
    >> tree_insert+0x86/0x1e0
    >> Feb 14 02:05:52 lupus kernel: [   70.057859]  [<ffffffff81058c73>] ?
    >> lock_timer_base.clone.22+0x33/0x70
    >> Feb 14 02:05:52 lupus kernel: [   70.058004]  [<ffffffff81305060>] ?
    >> btree_get_extent+0x0/0x1c0
    >> Feb 14 02:05:52 lupus kernel: [   70.058097]  [<ffffffff81330b21>] ?
    >> read_extent_buffer_pages+0x2d1/0x470
    >> Feb 14 02:05:52 lupus kernel: [   70.058191]  [<ffffffff81305060>] ?
    >> btree_get_extent+0x0/0x1c0
    >> Feb 14 02:05:52 lupus kernel: [   70.058283]  [<ffffffff8130674d>] ?
    >> btree_read_extent_buffer_pages.clone.65+0x4d/0xa0
    >> Feb 14 02:05:52 lupus kernel: [   70.058415]  [<ffffffff813076f9>] ?
    >> read_tree_block+0x39/0x60
    >> Feb 14 02:05:52 lupus kernel: [   70.058508]  [<ffffffff812ed5e6>] ?
    >> read_block_for_search.clone.40+0x116/0x410
    >> Feb 14 02:05:52 lupus kernel: [   70.058638]  [<ffffffff812eb228>] ?
    >> btrfs_cow_block+0x118/0x2b0
    >> Feb 14 02:05:52 lupus kernel: [   70.058731]  [<ffffffff812f0bc7>] ?
    >> btrfs_search_slot+0x307/0xa00
    >> Feb 14 02:05:52 lupus kernel: [   70.058823]  [<ffffffff812f6b18>] ?
    >> lookup_inline_extent_backref+0x98/0x4a0
    >> Feb 14 02:05:52 lupus kernel: [   70.058919]  [<ffffffff810e33d7>] ?
    >> kmem_cache_alloc+0x87/0xa0
    >> Feb 14 02:05:52 lupus kernel: [   70.059032]  [<ffffffff812f891c>] ?
    >> __btrfs_free_extent+0xcc/0x6f0
    >> Feb 14 02:05:52 lupus kernel: [   70.059125]  [<ffffffff812fc4cf>] ?
    >> run_clustered_refs+0x39f/0x880
    >> Feb 14 02:05:52 lupus kernel: [   70.059220]  [<ffffffff810b1f98>] ?
    >> pagevec_lookup_tag+0x18/0x20
    >> Feb 14 02:05:52 lupus kernel: [   70.059312]  [<ffffffff810a7c81>] ?
    >> filemap_fdatawait_range+0x91/0x180
    >> Feb 14 02:05:52 lupus kernel: [   70.059405]  [<ffffffff812fca77>] ?
    >> btrfs_run_delayed_refs+0xc7/0x220
    >> Feb 14 02:05:52 lupus kernel: [   70.059498]  [<ffffffff8130c29c>] ?
    >> btrfs_commit_transaction+0x7c/0x760
    >> Feb 14 02:05:52 lupus kernel: [   70.059591]  [<ffffffff81067ea0>] ?
    >> autoremove_wake_function+0x0/0x30
    >> Feb 14 02:05:52 lupus kernel: [   70.059683]  [<ffffffff8130cdef>] ?
    >> start_transaction+0x1bf/0x270
    >> Feb 14 02:05:52 lupus kernel: [   70.059775]  [<ffffffff8110e96a>] ?
    >> __sync_filesystem+0x5a/0x90
    >> Feb 14 02:05:52 lupus kernel: [   70.059867]  [<ffffffff810eae8d>] ?
    >> generic_shutdown_super+0x2d/0x100
    >> Feb 14 02:05:52 lupus kernel: [   70.059960]  [<ffffffff810eafb9>] ?
    >> kill_anon_super+0x9/0x50
    >> Feb 14 02:05:52 lupus kernel: [   70.060051]  [<ffffffff810eb266>] ?
    >> deactivate_locked_super+0x26/0x80
    >> Feb 14 02:05:52 lupus kernel: [   70.060144]  [<ffffffff811043ea>] ?
    >> sys_umount+0x7a/0x390
    >> Feb 14 02:05:52 lupus kernel: [   70.060235]  [<ffffffff810027bb>] ?
    >> system_call_fastpath+0x16/0x1b
    >> Feb 14 02:05:52 lupus kernel: [   70.060325] Code: 55 b8 ff 00 00 00
    >> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00
    >> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00
    >> 48 89 06 84 c9 48 8b 85 68 fe ff ff
    >> Feb 14 02:05:52 lupus kernel: [   70.063170] RIP  [<ffffffff8133ef1b>]
    >> btrfs_encode_fh+0x2b/0x120
    >> Feb 14 02:05:52 lupus kernel: [   70.063302]  RSP <ffff88023c77d6f8>
    >> Feb 14 02:05:52 lupus kernel: [   70.063386] CR2: 0000030341ed0050
    >> Feb 14 02:05:52 lupus kernel: [   70.063528] ---[ end trace
    >> 3313552d105b1535 ]---
    >> Feb 14 02:06:16 lupus kernel: [   93.961960] BUG: unable to handle
    >> kernel paging request at 0000030341ed0050
    >> Feb 14 02:06:16 lupus kernel: [   93.962171] IP: [<ffffffff8133ef1b>]
    >> btrfs_encode_fh+0x2b/0x120
    >> Feb 14 02:06:16 lupus kernel: [   93.962307] PGD 0
    >> Feb 14 02:06:16 lupus kernel: [   93.962430] Oops: 0000 [#2] PREEMPT SMP
    >> Feb 14 02:06:16 lupus kernel: [   93.962637] last sysfs file:
    >> /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
    >> Feb 14 02:06:16 lupus kernel: [   93.962766] CPU 5
    >> Feb 14 02:06:16 lupus kernel: [   93.962812] Modules linked in:
    >> ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc
    >> nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
    >> nf_conntrack_ftp iptable_filter ipt_addrtype xt_DSCP xt_dscp
    >> xt_iprange ip_tables ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit
    >> xt_conntrack xt_mark xt_multiport xt_connmark nf_conntrack xt_string
    >> ip6_tables x_tables it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss
    >> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss
    >> snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec
    >> snd_hwdep snd_pcm snd_timer snd i2c_i801 soundcore wmi shpchp e1000e
    >> snd_page_alloc libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb
    >> usb_storage ehci_hcd [last unloaded: tg3]
    >> Feb 14 02:06:16 lupus kernel: [   93.966044]
    >> Feb 14 02:06:16 lupus kernel: [   93.966127] Pid: 7915, comm:
    >> btrfs-transacti Tainted: G      D     2.6.37-plus_v16_zcache #4
    >> FMP55/ipower G3710
    >> Feb 14 02:06:16 lupus kernel: [   93.966266] RIP:
    >> 0010:[<ffffffff8133ef1b>]  [<ffffffff8133ef1b>]
    >> btrfs_encode_fh+0x2b/0x120
    >> Feb 14 02:06:16 lupus kernel: [   93.966440] RSP:
    >> 0018:ffff88023c63b6e0  EFLAGS: 00010246
    >> Feb 14 02:06:16 lupus kernel: [   93.966528] RAX: 00000000000000ff
    >> RBX: ffff88023cde0168 RCX: 0000000000000000
    >> Feb 14 02:06:16 lupus kernel: [   93.966620] RDX: ffff88023c63b71c
    >> RSI: ffff88023c63b750 RDI: 0000000000000006
    >> Feb 14 02:06:16 lupus kernel: [   93.966713] RBP: 0000030341ed0000
    >> R08: ffffffff8133eef0 R09: ffff88023c63b8c0
    >> Feb 14 02:06:16 lupus kernel: [   93.966805] R10: 0000000000000003
    >> R11: 0000000000000001 R12: 00000000ffffffff
    >> Feb 14 02:06:16 lupus kernel: [   93.966897] R13: ffff88023cde0030
    >> R14: ffffea0007d59bc8 R15: 0000000000000001
    >> Feb 14 02:06:16 lupus kernel: [   93.966990] FS:
    >> 0000000000000000(0000) GS:ffff8800bf540000(0000)
    >> knlGS:0000000000000000
    >> Feb 14 02:06:16 lupus kernel: [   93.967120] CS:  0010 DS: 0000 ES:
    >> 0000 CR0: 000000008005003b
    >> Feb 14 02:06:16 lupus kernel: [   93.967209] CR2: 0000030341ed0050
    >> CR3: 0000000001c27000 CR4: 00000000000006e0
    >> Feb 14 02:06:16 lupus kernel: [   93.967302] DR0: 0000000000000000
    >> DR1: 0000000000000000 DR2: 0000000000000000
    >> Feb 14 02:06:16 lupus kernel: [   93.967394] DR3: 0000000000000000
    >> DR6: 00000000ffff0ff0 DR7: 0000000000000400
    >> Feb 14 02:06:16 lupus kernel: [   93.967500] Process btrfs-transacti
    >> (pid: 7915, threadinfo ffff88023c63a000, task ffff88023c7a1620)
    >> Feb 14 02:06:16 lupus kernel: [   93.967630] Stack:
    >> Feb 14 02:06:16 lupus kernel: [   93.967711]  0000000000000000
    >> 0000000000000002 0000000000000000 0000000000000003
    >> Feb 14 02:06:16 lupus kernel: [   93.968057]  ffffea0007d59bc8
    >> ffffffff810e6aaa 0000000000000041 0000000600000002
    >> Feb 14 02:06:16 lupus kernel: [   93.968348]  0000000000000000
    >> ffffffff810e6b3a 0000000000000001 ffffffff00000001
    >> Feb 14 02:06:16 lupus kernel: [   93.968639] Call Trace:
    >> Feb 14 02:06:16 lupus kernel: [   93.968728]  [<ffffffff810e6aaa>] ?
    >> cleancache_get_key+0x4a/0x60
    >> Feb 14 02:06:16 lupus kernel: [   93.968820]  [<ffffffff810e6b3a>] ?
    >> __cleancache_get_page+0x7a/0xd0
    >> Feb 14 02:06:16 lupus kernel: [   93.968914]  [<ffffffff8132e4de>] ?
    >> __extent_read_full_page+0x52e/0x710
    >> Feb 14 02:06:16 lupus kernel: [   93.969008]  [<ffffffff812f3f93>] ?
    >> update_reserved_bytes+0xb3/0x140
    >> Feb 14 02:06:16 lupus kernel: [   93.969102]  [<ffffffff81305060>] ?
    >> btree_get_extent+0x0/0x1c0
    >> Feb 14 02:06:16 lupus kernel: [   93.969193]  [<ffffffff8132bb7c>] ?
    >> merge_state+0x7c/0x150
    >> Feb 14 02:06:16 lupus kernel: [   93.969285]  [<ffffffff81330b21>] ?
    >> read_extent_buffer_pages+0x2d1/0x470
    >> Feb 14 02:06:16 lupus kernel: [   93.969378]  [<ffffffff81305060>] ?
    >> btree_get_extent+0x0/0x1c0
    >> Feb 14 02:06:16 lupus kernel: [   93.969470]  [<ffffffff8130674d>] ?
    >> btree_read_extent_buffer_pages.clone.65+0x4d/0xa0
    >> Feb 14 02:06:16 lupus kernel: [   93.969602]  [<ffffffff813076f9>] ?
    >> read_tree_block+0x39/0x60
    >> Feb 14 02:06:16 lupus kernel: [   93.969694]  [<ffffffff812ed5e6>] ?
    >> read_block_for_search.clone.40+0x116/0x410
    >> Feb 14 02:06:16 lupus kernel: [   93.969878]  [<ffffffff812f0bc7>] ?
    >> btrfs_search_slot+0x307/0xa00
    >> Feb 14 02:06:16 lupus kernel: [   93.969970]  [<ffffffff812f6b18>] ?
    >> lookup_inline_extent_backref+0x98/0x4a0
    >> Feb 14 02:06:16 lupus kernel: [   93.970065]  [<ffffffff810e33d7>] ?
    >> kmem_cache_alloc+0x87/0xa0
    >> Feb 14 02:06:16 lupus kernel: [   93.970157]  [<ffffffff812f891c>] ?
    >> __btrfs_free_extent+0xcc/0x6f0
    >> Feb 14 02:06:16 lupus kernel: [   93.970249]  [<ffffffff812f8434>] ?
    >> update_block_group.clone.62+0xc4/0x280
    >> Feb 14 02:06:16 lupus kernel: [   93.970343]  [<ffffffff812fc4cf>] ?
    >> run_clustered_refs+0x39f/0x880
    >> Feb 14 02:06:16 lupus kernel: [   93.970436]  [<ffffffff812fca77>] ?
    >> btrfs_run_delayed_refs+0xc7/0x220
    >> Feb 14 02:06:16 lupus kernel: [   93.970529]  [<ffffffff810e15f9>] ?
    >> new_slab+0x169/0x1f0
    >> Feb 14 02:06:16 lupus kernel: [   93.970619]  [<ffffffff8130c29c>] ?
    >> btrfs_commit_transaction+0x7c/0x760
    >> Feb 14 02:06:16 lupus kernel: [   93.970713]  [<ffffffff81067ea0>] ?
    >> autoremove_wake_function+0x0/0x30
    >> Feb 14 02:06:16 lupus kernel: [   93.970806]  [<ffffffff81305bc3>] ?
    >> transaction_kthread+0x283/0x2a0
    >> Feb 14 02:06:16 lupus kernel: [   93.970898]  [<ffffffff81305940>] ?
    >> transaction_kthread+0x0/0x2a0
    >> Feb 14 02:06:16 lupus kernel: [   93.970990]  [<ffffffff81305940>] ?
    >> transaction_kthread+0x0/0x2a0
    >> Feb 14 02:06:16 lupus kernel: [   93.971083]  [<ffffffff81067a16>] ?
    >> kthread+0x96/0xa0
    >> Feb 14 02:06:16 lupus kernel: [   93.971174]  [<ffffffff81003514>] ?
    >> kernel_thread_helper+0x4/0x10
    >> Feb 14 02:06:16 lupus kernel: [   93.971266]  [<ffffffff81067980>] ?
    >> kthread+0x0/0xa0
    >> Feb 14 02:06:16 lupus kernel: [   93.971355]  [<ffffffff81003510>] ?
    >> kernel_thread_helper+0x0/0x10
    >> Feb 14 02:06:16 lupus kernel: [   93.971444] Code: 55 b8 ff 00 00 00
    >> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00
    >> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00
    >> 48 89 06 84 c9 48 8b 85 68 fe ff ff
    >> Feb 14 02:06:16 lupus kernel: [   93.974280] RIP  [<ffffffff8133ef1b>]
    >> btrfs_encode_fh+0x2b/0x120
    >> Feb 14 02:06:16 lupus kernel: [   93.974412]  RSP <ffff88023c63b6e0>
    >> Feb 14 02:06:16 lupus kernel: [   93.974497] CR2: 0000030341ed0050
    >> Feb 14 02:06:16 lupus kernel: [   93.974599] ---[ end trace
    >> 3313552d105b1536 ]---
    >> Feb 14 02:07:04 lupus kernel: [  141.906124] zcache: destroyed pool id=2
    >> Feb 14 02:07:17 lupus kernel: [  154.783358] SysRq : Keyboard mode set
    >> to system default
    >> Feb 14 02:07:18 lupus kernel: [  155.486147] SysRq : Terminate All Tasks
    >>
    >>
    >> That's all for now
    >>
    >> Thanks & Regards
    >>
    >> Matt
    >>
    >
    > (leaving out several folks from the CC to avoid spamming - if I left
    > out someone wrongfully please re-add)
    >
    > running an addr2line reveals:
    >
    >
    > addr2line -e /usr/src/linux-2.6.37_vanilla/vmlinux -i ffffffff81338cbb
    > export.c:0
    >
    >
    > hope that helps
    >
    >
    > Regards
    >
    > Matt
    >


    ok, maybe it's useful to have some more details how to reproduce it as
    easily as possible and about my configuration:

    preparation steps:

    1) 2.6.37 vanilla kernel with the mentioned changes to zram (and
    xvmalloc), zcache (+ fixes)

    configuration specifics:

    CONFIG_CRYPTO_PCRYPT=y

    2) on a non-btrfs partition or with zcache disable: get a
    portage-tarball comparable to mine download from one of the
    gentoo-mirrors (http://www.gentoo.org/main/en/mirrors2.xml), e.g. the
    University of California:
    ftp://ftp.ucsb.edu/pub/mirrors/linux/gentoo/snapshots/

    (weighing only around 40 MiB) then

    get that tarball to a decent size by adding the latest changes from a
    rsync-mirror (http://www.gentoo.org/main/en/mirrors-rsync.xml)

    I can also upload my specific tarball weighing at 1.7 GiB at request -
    just point me a place to drop it

    3) creating a tar.bzip2 ball (preferably via 7z or pbzip2 so that it
    can be extracted later in parallel to create some pressure)


    Hardware:
    core i7 860 (4 cores - ht -> 8 threads), 8 GiB of RAM,
    underlying harddrive is a Samsung HD203WI, NCQ is disabled
    (queue_depth set to "1"), using CFQ as i/o scheduler

    echo "13" > /proc/sys/vm/page-cluster
    echo "60" > /proc/sys/vm/swappiness
    echo "3000" > /proc/sys/vm/dirty_expire_centisecs
    echo "1500" > /proc/sys/vm/dirty_writeback_centisecs
    echo "15" > /proc/sys/vm/dirty_background_ratio
    echo "50" > /proc/sys/vm/dirty_ratio
    echo "50" > /proc/sys/vm/vfs_cache_pressure
    echo "32768" > /proc/sys/vm/min_free_kbytes

    for i in /sys/block/sd*; do
    /bin/echo "4096" > $i/queue/read_ahead_kb
    /bin/echo "64" > $i/queue/max_sectors_kb
    /bin/echo "1" > $i/queue/rq_affinity
    done

    nr_requests is set to "1024"

    slice_sync to "150"
    fifo_expire_sync to "50"

    echo 4096 > /sys/class/bdi/default/read_ahead_kb


    steps to get the "result":

    1) cryptsetup-partition with aes or twofish-encryption (512 bits)
    [using cryptsetup 1.1.3* or 1.2*]

    2) on top of that btrfs

    3) extracting the tarball (usually I'm adding a "time" in front to see
    how long it took): time (7z e -so -tbzip2 -mmt=5
    /system/portage_backup_022011.tbz2 | tar
    -xp -C /usr/gentoo/)


    "result":

    1) it seems to take several seconds or even minutes until that BUG
    message gets shown so maybe some memory (or other kind of subsystem)
    pressure is needed to trigger it


    I hope that's useful in reproducing the BUG


    Thanks & Regards

    Matt
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