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    SubjectRe: 2.6.20-mm2: Oops in generic_make_request
    On 18/02/07, Andrew Morton <akpm@linux-foundation.org> wrote:
    > On Sun, 18 Feb 2007 18:58:05 +0100 Mattia Dongili <malattia@linux.it> wrote:
    >
    > > On Sun, Feb 18, 2007 at 02:06:59PM +0100, Laurent Riffard wrote:
    > > > Le 18.02.2007 06:51, Andrew Morton a écrit :
    > > > >Temporarily at
    > > > >
    > > > > http://userweb.kernel.org/~akpm/2.6.20-mm2/
    > > > >
    > > > >Will appear later at
    > > > >
    > > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20/2.6.20-mm2/
    > > >
    > > > Hello, I've got a fully reproducible Oops. I just have to boot to
    > > > runlevel 2 and wait less than one minute.
    > >
    > > Maybe this oops is related too?
    >
    > Looks that way.
    >
    > > Can't yet tell if it's easily reproducible, this is on a JFS filesystem.
    > >
    > > BUG: unable to handle kernel NULL pointer dereference at virtual address 00000004
    > > printing eip:
    > > c02206aa
    > > *pde = 00000000
    > > Oops: 0000 [#1]
    > > PREEMPT
    > > last sysfs file: /devices/pci0000:00/0000:00:00.0/class
    > > CPU: 0
    > > EIP: 0060:[<c02206aa>] Not tainted VLI
    > > EFLAGS: 00010297 (2.6.20-mm2-1 #1)
    > > EIP is at __make_request+0x13a/0x390
    > > eax: ffffffff ebx: 00000000 ecx: 042b0dd8 edx: 00010485
    > > esi: c5f8cea0 edi: cfd587f8 ebp: c653dadc esp: c653dabc
    > > ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
    > > Process sh (pid: 4549, ti=c653c000 task=ccca2090 task.ti=c653c000)
    > > Stack: c137eae8 00000001 cfd587e4 c5f8cea0 c5f893e4 c137eae8 c5f8cea0 00000008
    > > c653db28 c021e0ca cfa3ffa0 cee6a2e0 cfa3ffa0 00000000 00000008 00000100
    > > 00011250 cfedaf60 c653db10 00000206 00000000 c653db18 c014a31e c653db48
    > > Call Trace:
    > > [<c01048ba>] show_trace_log_lvl+0x1a/0x30
    > > [<c0104979>] show_stack_log_lvl+0xa9/0xd0
    > > [<c0104ba6>] show_registers+0x206/0x350
    > > [<c0104dfe>] die+0x10e/0x210
    > > [<c0114652>] do_page_fault+0x2d2/0x600
    > > [<c0351f84>] error_code+0x74/0x7c
    > > [<c021e0ca>] generic_make_request+0x15a/0x200
    > > [<c0220318>] submit_bio+0x58/0xe0
    > > [<c0205d0f>] metapage_writepage+0x18f/0x1b0
    > > [<c014cc2b>] __writepage+0xb/0x30
    > > [<c014d20f>] write_cache_pages+0x22f/0x300
    > > [<c014d303>] generic_writepages+0x23/0x30
    > > [<c014d36c>] do_writepages+0x5c/0x60
    > > [<c0148307>] __filemap_fdatawrite_range+0x67/0x80
    > > [<c0149785>] filemap_flush+0x25/0x30
    > > [<c02080cd>] lmLogSync+0x19d/0x230
    > > [<c020871e>] lmLog+0x5e/0x190
    > > [<c020a360>] txCommit+0x8c0/0x1010
    > > [<c01eecf4>] jfs_create+0x324/0x370
    > > [<c016f38f>] vfs_create+0xaf/0x100
    > > [<c017269c>] open_namei+0x58c/0x640
    > > [<c0165b7c>] do_filp_open+0x2c/0x50
    > > [<c0165be7>] do_sys_open+0x47/0xe0
    > > [<c0165cbc>] sys_open+0x1c/0x20
    > > [<c01041c0>] syscall_call+0x7/0xb
    >
    > Michal Piotrowski is hitting it too, and has bisected it down to
    > git-block.patch.
    >

    I have bisected it down to this patches

    revert-md-avoid-possible-bug_on-in-md-bitmap-handling-for-git-block.patch
    git-block.patch
    git-block-fixup.patch
    git-block-dupe-definitions.patch
    git-block-xfs-barriers-broke.patch

    Regards,
    Michal

    --
    Michal K. K. Piotrowski
    LTG - Linux Testers Group (PL)
    (http://www.stardust.webpages.pl/ltg/)
    LTG - Linux Testers Group (EN)
    (http://www.stardust.webpages.pl/linux_testers_group_en/)
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