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    SubjectRe: 2.6.17-mm5
    On Sat, 1 Jul 2006 15:24:19 +0100
    Grant Wilson <grant.wilson@zen.co.uk> wrote:

    > More RAID1 problems - OOPS on shutdown.

    Thanks. Please copy the mailing lists on these reports - I'm not an MD,
    SCSI or SATA developer, and this is in their area.

    > [ 37.482699] md: Autodetecting RAID arrays.
    > [ 37.547908] md: autorun ...
    > [ 37.566449] md: considering sdb2 ...
    > [ 37.589664] md: adding sdb2 ...
    > [ 37.610757] md: adding sda2 ...
    > [ 37.632116] md: created md1
    > [ 37.650587] md: bind<sda2>
    > [ 37.668571] md: bind<sdb2>
    > [ 37.686541] md: running: <sdb2><sda2>
    > [ 37.710807] raid1: raid set md1 active with 2 out of 2 mirrors
    > [ 37.747557] md: ... autorun DONE.
    > [ 37.784444] EXT3-fs: INFO: recovery required on readonly filesystem.
    > [ 37.824275] EXT3-fs: write access will be enabled during recovery.
    > [ 38.814113] kjournald starting. Commit interval 5 seconds
    > [ 38.848761] EXT3-fs: sdc1: orphan cleanup on readonly fs
    > [ 38.985436] EXT3-fs: sdc1: 7 orphan inodes deleted
    > [ 39.015845] EXT3-fs: recovery complete.
    > [ 39.072168] EXT3-fs: mounted filesystem with ordered data mode.
    > [ 44.693986] Adding 995988k swap on /dev/sda1. Priority:-1 extents:1 across:995988k
    > [ 44.744558] Adding 995988k swap on /dev/sdb1. Priority:-2 extents:1 across:995988k
    > [ 44.966034] EXT3 FS on sdc1, internal journal
    > [ 49.305350] device-mapper: ioctl: 4.8.0-ioctl (2006-06-24) initialised: dm-devel@redhat.com
    > [ 64.091331] raid1: Disk failure on sdb2, disabling device.
    > [ 64.091333] Operation continuing on 1 devices
    > [ 64.212624] RAID1 conf printout:
    > [ 64.233951] --- wd:1 rd:2
    > [ 64.252195] disk 0, wo:0, o:1, dev:sda2
    > [ 64.277712] disk 1, wo:1, o:0, dev:sdb2
    > [ 64.305627] RAID1 conf printout:
    > [ 64.326977] --- wd:1 rd:2
    > [ 64.345220] disk 0, wo:0, o:1, dev:sda2
    > [

    Which device drivers are being used for these disks?

    > [ 155.123022] Unable to handle kernel NULL pointer dereference at 0000000000000048 RIP:
    > [ 155.155867] [<ffffffff8047157a>] md_error+0x45/0x91
    > [ 155.200353] PGD 77954067 PUD 726e5067 PMD 0
    > [ 155.226233] Oops: 0000 [1] PREEMPT SMP
    > [ 155.249516] last sysfs file: /devices/system/cpu/cpu0/cpufreq/scaling_setspeed
    > [ 155.292808] CPU 0
    > [ 155.304968] Modules linked in: dm_mod evdev
    > [ 155.330331] Pid: 0, comm: swapper Not tainted 2.6.17-mm5 #1
    > [ 155.363697] RIP: 0010:[<ffffffff8047157a>] [<ffffffff8047157a>] md_error+0x45/0x91
    > [ 155.409638] RSP: 0018:ffffffff807a0c50 EFLAGS: 00010046
    > [ 155.441445] RAX: 0000000000000000 RBX: ffff81007aa34708 RCX: 000000000000003f
    > [ 155.484216] RDX: 00000000fffffffb RSI: ffff81007a821d28 RDI: ffff81007aa34708
    > [ 155.526989] RBP: ffffffff807a0c60 R08: 0000000000000000 R09: ffff81007aac43b0
    > [ 155.569759] R10: ffffffff804221e5 R11: 0000000000000058 R12: ffff81007aac4ab0
    > [ 155.612533] R13: ffff81007aac43b0 R14: ffff81007aac4ab0 R15: 00000000fffffffb
    > [ 155.655303] FS: 00002aeb361606d0(0000) GS:ffffffff80a46000(0000) knlGS:0000000000000000
    > [ 155.703791] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > [ 155.738195] CR2: 0000000000000048 CR3: 0000000070997000 CR4: 00000000000006e0
    > [ 155.780969] Process swapper (pid: 0, threadinfo ffffffff80a64000, task ffffffff80696a00)
    > [ 155.829404] Stack: ffff81007a821d28 ffff81007aa34708 ffffffff807a0c80 ffffffff804728d9
    > [ 155.877840] ffff81007a821d28 ffff81007aa34708 ffffffff807a0cc0 ffffffff8047409c
    > [ 155.922535] 00001000807a0d00 ffff81007aac4ab0 00000000fffffffb ffff81007aac4ab0
    > [ 155.966085] Call Trace:
    > [ 155.982416] [<ffffffff804728d9>] super_written+0x30/0x65
    > [ 156.015292] [<ffffffff8047409c>] super_written_barrier+0xc4/0xd1
    > [ 156.052297] [<ffffffff8023a5a5>] bio_endio+0x56/0x5b
    > [ 156.082688] [<ffffffff8022d21b>] __end_that_request_first+0x1c9/0x4c9
    > [ 156.122068] [<ffffffff8024a0d6>] end_that_request_first+0xc/0xe
    > [ 156.158343] [<ffffffff8036a692>] blk_ordered_complete_seq+0x7c/0x8b
    > [ 156.196705] [<ffffffff8036a6d1>] post_flush_end_io+0x30/0x35
    > [ 156.231419] [<ffffffff8036a5b5>] end_that_request_last+0xd9/0xf6
    > [ 156.268215] [<ffffffff80422204>] scsi_end_request+0xad/0xd7
    > [ 156.302573] [<ffffffff80422637>] scsi_io_completion+0x3e1/0x3f0
    > [ 156.339004] [<ffffffff8042266c>] scsi_blk_pc_done+0x26/0x28
    > [ 156.373357] [<ffffffff8041d11e>] scsi_finish_command+0xa9/0xb2
    > [ 156.409264] [<ffffffff804229f9>] scsi_softirq_done+0xf4/0xfd
    > [ 156.444143] [<ffffffff80237f66>] blk_done_softirq+0x70/0x7f
    > [ 156.478323] [<ffffffff80211366>] __do_softirq+0x67/0xf4
    > [ 156.510224] [<ffffffff8025f95e>] call_softirq+0x1e/0x28
    > [ 156.542083]
    > [ 156.542083] Code: 48 8b 40 48 48 85 c0 74 3f ff d0 f0 0f ba ab e0 01 00 00 03

    The barrier code is in there again.

    mddev->pers is NULL in md_error(), so the test of
    !mddev->pers->error_handler oopsed. Perhaps this is a real MD bug which is
    now being exposed by the new barrier-handling problem.


    This should get you further, but...

    From: Andrew Morton <akpm@osdl.org>

    Cc: Neil Brown <neilb@suse.de>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    ---

    drivers/md/md.c | 2 ++
    1 file changed, 2 insertions(+)

    diff -puN drivers/md/md.c~md-oops-workaround drivers/md/md.c
    --- a/drivers/md/md.c~md-oops-workaround
    +++ a/drivers/md/md.c
    @@ -4586,6 +4586,8 @@ void md_error(mddev_t *mddev, mdk_rdev_t
    __builtin_return_address(0),__builtin_return_address(1),
    __builtin_return_address(2),__builtin_return_address(3));
    */
    + if (!mddev->pers)
    + return;
    if (!mddev->pers->error_handler)
    return;
    mddev->pers->error_handler(mddev,rdev);
    _
    -
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