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    SubjectRe: oops at sr_block_release [Re: 2.6.23-rc3-mm1]
    Hi Jiri,


    On Tue, 28 Aug 2007, Jiri Slaby wrote:

    > Andrew Morton napsal(a):
    > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc3/2.6.23-rc3-mm1/
    >
    > I got this during gxine initialization of ocko.tv live stream without any cd in
    > cdroms:

    Yup, that's an old habit of hald-addon-storage ... doing open(2),
    ioctl(2) and close(2) on the cdrom block device even when it's idle,
    every 2 seconds.


    > BUG: unable to handle kernel NULL pointer dereference at virtual address 0000005c
    > printing eip: f88fbe7a *pde = 00000000
    > Oops: 0000 [#1] SMP
    > Modules linked in: ath5k arc4 ecb blkcipher cryptomgr crypto_algapi
    > rc80211_simple mac80211 cfg80211 nls_cp437 vfat fat usb_storage tun ipv6 floppy
    > parport_pc parport ohci1394 ieee1394 usbhid sr_mod ehci_hcd cdrom ff_memless
    >
    > Pid: 2809, comm: hald-addon-stor Not tainted (2.6.23-rc3-mm1 #315)
    > EIP: 0060:[<f88fbe7a>] EFLAGS: 00010246 CPU: 1
    > EIP is at sr_block_release+0xb/0x2c [sr_mod]
    > EAX: 00000000 EBX: 00000000 ECX: f88fbe6f EDX: 00000000
    > ESI: c21c36c0 EDI: c289a780 EBP: c3729f18 ESP: c3729f10
    > DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    > Process hald-addon-stor (pid: 2809, ti=c3729000 task=c1c2be40 task.ti=c3729000)
    > Stack: 00000000 c21c36c0 c3729f38 c018d7ad c21c36cc c1f9ff80 c21c3730 c21c36c0
    > c2a6ada0 dcbb3f80 c3729f40 c018d7dc c3729f4c c018e103 00000010 c3729f74
    > c016bc5f 00000000 00000000 c217fa80 c1f9ff80 c2a6ada0 dcbb3f80 c1cc6900
    > Call Trace:
    > [<c0105022>] show_trace_log_lvl+0x1a/0x30
    > [<c01050dd>] show_stack_log_lvl+0xa5/0xca
    > [<c01051d2>] show_registers+0xd0/0x1c1
    > [<c01053cd>] die+0x10a/0x24d
    > [<c011afbe>] do_page_fault+0x496/0x608
    > [<c03768e2>] error_code+0x72/0x78
    > [<c018d7ad>] __blkdev_put+0x125/0x14a
    > [<c018d7dc>] blkdev_put+0xa/0xc
    > [<c018e103>] blkdev_close+0x29/0x2c
    > [<c016bc5f>] __fput+0xa6/0x161
    > [<c016bea4>] fput+0x22/0x3b
    > [<c016960b>] filp_close+0x41/0x67
    > [<c016a78c>] sys_close+0x60/0x9f
    > [<c01040ce>] syscall_call+0x7/0xb
    > =======================
    > Code: 0c 81 c3 4c 01 00 00 89 5c 24 08 89 44 24 04 c7 04 24 88 cd 8f f8 e8 99 84
    > 82 c7 e9 04 fe ff ff 55 89 e5 56 53 8b 80 04 01 00 00 <8b> 40 5c 8b 70 3c 8d 46
    > 18 e8 cf f6 fe ff 89 c3 85 c0 75 07 89
    > EIP: [<f88fbe7a>] sr_block_release+0xb/0x2c [sr_mod] SS:ESP 0068:c3729f10

    blkdev_put(bdev, ...)
    __blkdev_put(bdev, ...)
    sr_block_release(bdev->bd_inode, ...)
    (sees bdev->bd_inode->i_bdev->bd_disk == NULL)

    Doesn't seem like an sr_block_release() (or sr_mod) issue to me at all,
    looks more like a wierd race in the block_device code ... can you send
    or put up some link to your .config?

    If this is reproducible (I bet it isn't, though) you could try bisecting.


    Satyam
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