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    SubjectRe: Linux 2.6.25-rc1
    On Feb 11, 2008 1:44 AM, Linus Torvalds <torvalds@linux-foundation.org> wrote:
    > So give it all a good testing.

    My mm-mystery-crash has now sneaked into mainline:
    [ 1463.829078] BUG: unable to handle kernel NULL pointer dereference
    at 0000000000000378
    [ 1463.832141] IP: [<ffffffff8047af18>] ether1394_dg_complete+0x28/0xa0
    [ 1463.834616] PGD 7955e067 PUD 7955d067 PMD 0
    [ 1463.836148] Oops: 0000 [1] SMP
    [ 1463.836148] CPU 0
    [ 1463.836148] Modules linked in: radeon drm w83792d ipv6 tuner
    tea5767 tda8290 tuner_xc2028 tda9887 tuner_simple mt20xx tea5761
    tvaudio msp3400 bttv videodev v4l1_compat ir_common compat_ioctl32
    v4l2_common videobuf_dma_sg videobuf_core btcx_risc usbhid tveeprom sg
    i2c_nforce2 hid pata_amd
    [ 1463.836148] Pid: 519, comm: khpsbpkt Not tainted 2.6.25-rc1 #1
    [ 1463.836148] RIP: 0010:[<ffffffff8047af18>] [<ffffffff8047af18>]
    ether1394_dg_complete+0x28/0xa0
    [ 1463.836148] RSP: 0000:ffff81007eeb1e80 EFLAGS: 00010282
    [ 1463.836148] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
    [ 1463.836148] RDX: ffff81004bc62d80 RSI: 0000000000000000 RDI: ffff810051873e40
    [ 1463.836148] RBP: ffff81007eeb1eb0 R08: 0000000000000000 R09: 0000000000000001
    [ 1463.836148] R10: 0000000000000001 R11: 0000000000000001 R12: ffff810051873e40
    [ 1463.836148] R13: ffff81007e1f7200 R14: 0000000000000001 R15: ffff810051873e40
    [ 1463.836148] FS: 00007f727d6d4700(0000) GS:ffffffff807e8000(0000)
    knlGS:0000000000000000
    [ 1463.836148] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    [ 1463.836148] CR2: 0000000000000378 CR3: 0000000079559000 CR4: 00000000000006e0
    [ 1463.836148] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [ 1463.836148] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    [ 1463.836148] Process khpsbpkt (pid: 519, threadinfo
    ffff81007eeb0000, task ffff81007ee9e000)
    [ 1463.836148] Stack: ffff81007eeb1e90 ffff81004bc62b40
    ffff810051873e40 0000000000000000
    [ 1463.836148] 0000000000000001 0000000000000000 ffff81007eeb1ee0
    ffffffff8047b233
    [ 1463.836148] ffff81007eeb1ec8 ffff81007eeb1ef0 ffffffff8046c280
    ffff81007ff6df10
    [ 1463.836148] Call Trace:
    [ 1463.836148] [<ffffffff8047b233>] ether1394_complete_cb+0xb3/0xd0
    [ 1463.836148] [<ffffffff8046c280>] ? hpsbpkt_thread+0x0/0x140
    [ 1463.836148] [<ffffffff8046c33b>] hpsbpkt_thread+0xbb/0x140
    [ 1463.836148] [<ffffffff8024aead>] kthread+0x4d/0x80
    [ 1463.836148] [<ffffffff8020c578>] child_rip+0xa/0x12
    [ 1463.836148] [<ffffffff8020bc8f>] ? restore_args+0x0/0x31
    [ 1463.836148] [<ffffffff8024ae60>] ? kthread+0x0/0x80
    [ 1463.836148] [<ffffffff8020c56e>] ? child_rip+0x0/0x12
    [ 1463.836148]
    [ 1463.836148]
    [ 1463.836148] Code: 00 00 00 55 48 89 e5 48 83 ec 30 48 89 5d d8 4c
    89 75 f0 89 f3 4c 89 7d f8 4c 89 65 e0 49 89 ff 4c 89 6d e8 4c 8b 2f
    49 8b 45 20 <4c> 8b a0 78 03 00 00 4d 8d b4 24 d0 00 00 00 4c 89 f7 e8
    41 f0
    [ 1463.836148] RIP [<ffffffff8047af18>] ether1394_dg_complete+0x28/0xa0
    [ 1463.836148] RSP <ffff81007eeb1e80>
    [ 1463.836148] CR2: 0000000000000378
    [ 1463.836208] ohci1394: fw-host0: Waking dma ctx=0 ... processing is
    probably too slow
    [ 1463.839250] BUG: unable to handle kernel NULL pointer dereference
    at 0000000000000000
    [ 1463.841549] IP: [<ffffffff80296d1d>] kmem_cache_alloc_node+0x6d/0xa0
    [ 1463.842925] PGD 7955e067 PUD 7955d067 PMD 0
    [ 1463.846148] Oops: 0000 [2] SMP
    [ 1463.846148] CPU 0
    [ 1463.846148] Modules linked in: radeon drm w83792d ipv6 tuner
    tea5767 tda8290 tuner_xc2028 tda9887 tuner_simple mt20xx tea5761
    tvaudio msp3400 bttv videodev v4l1_compat ir_common compat_ioctl32
    v4l2_common videobuf_dma_sg videobuf_core btcx_risc usbhid tveeprom sg
    i2c_nforce2 hid pata_amd
    [ 1463.846148] Pid: 519, comm: khpsbpkt Tainted: G D 2.6.25-rc1 #1
    [ 1463.846148] RIP: 0010:[<ffffffff80296d1d>] [<ffffffff80296d1d>]
    kmem_cache_alloc_node+0x6d/0xa0
    [ 1463.846148] RSP: 0000:ffffffff80871ae0 EFLAGS: 00010046
    [ 1463.846148] RAX: 0000000000000000 RBX: ffff810001006820 RCX: ffffffff8052c549
    [ 1463.846148] RDX: 00000000ffffffff RSI: 0000000000000000 RDI: ffffffff807fbec0
    [ 1463.846148] RBP: ffffffff80871b00 R08: 00000000000005e0 R09: 000000000000ffc1
    [ 1463.846148] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000ffffffff
    [ 1463.846148] R13: 0000000000000020 R14: 0000000000000020 R15: ffffffff807fbec0
    -> here the output from the serial console stopped.
    Caps lock and Scroll lock where flashing again and as it hit a 'good'
    spot during the installing of the package this crash resulted in a
    corrupted ld.so.cache and damage several housekeeping files of the
    package manager. :-(

    Last good mm was 2.6.24-rc2-mm1, the next booting mm was
    2.6.24-rc3-mm2 and that version had these "random" crashes.
    Last good mainline was 2.6.24-rc7 that I was testing with the new
    iommu patches that where added to 2.6.24-rc3-mm2.

    I did a partly bisect of 2.6.24-rc6-mm1 that narrow it to this range:
    2.6.24-rc6 + mm-patches up to (including) git.nfsd -> worked
    2.6.24-rc6 + mm-patches up to (including) git.xfs -> crashed

    I think the only added patch between rc2-mm1 and rc3-mm2 in that range
    where the iommu changes that I later ruled out.
    That leaves some git trees as suspects:
    git-ocfs2.patch
    git-selinux.patch
    git-s390.patch
    git-sched.patch
    git-sh.patch
    git-scsi-misc.patch
    git-unionfs.patch
    git-v9fs.patch
    git-watchdog.patch
    git-wireless.patch
    git-ipwireless_cs.patch
    git-x86.patch
    git-xfs.patch

    I don't use ocfs2, selinux, unionfs or the p9fs.
    The system is a dual opteron x86_64 system with 4 GB ECC RAM and an
    nVidia 3600 chipset (MCP55).
    As noted in the rc3-mm2-thread the crash will also happen, if I use
    normal ethernet instead of ether1394.

    The root filesystem is xfs on dm-crypt on raid5 on 3 sata disks. 2 on
    sata_sil24, 1 on sata_nv.

    My testcase is updating the system, this means in the case of gentoo
    compiling the new packages, then installing them. The portage tree and
    the distfiles (source packages) are on a NFSv4 share.

    Sadly I currently lack the time to do much testing, so further
    bisecting that mm-kernel is not possible, as each step takes several
    hours of compiling packages and hoping to hit the bug. Somtimes I
    needed to compile over 100 KDE packages until it triggered.

    Torsten


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