Re: oops at sr_block_release [Re: 2.6.23-rc3-mm1]

[Jiri Slaby]

Satyam Sharma napsal(a):
> 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?

http://www.fi.muni.cz/~xslaby/sklad/config-2.6.23-rc3-mm1

> If this is reproducible

:) no.

-- 
Jiri Slaby (jirislaby@xxxxxxxxx)
Faculty of Informatics, Masaryk University
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