[Unionfs] Oops: unionfs-2.1.6

[John Nielsen]

Hi list,

I am seeing seemingly random oopses with unionfs that at least partially locks up the kernel. I am not much of a programmer so I was wondering if you guys had any input on this problem. This issue has been haunting me for the past few releases.

I am running a bog standart kernel.org 2.6.22.9 vanilla kernel plus the 2.1.6 unionfs patch. I havent been able to track down the issue to a specific cause. The crashes appear to be random and rather difficult to reproduce.

I have attached my kernel config.

I got this from my kern.log file:

Oct 18 01:47:38 (none) kernel: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000134
Oct 18 01:47:38 (none) kernel:  printing eip:
Oct 18 01:47:38 (none) kernel: c0162b30
Oct 18 01:47:38 (none) kernel: *pde = 00000000
Oct 18 01:47:38 (none) kernel: Oops: 0000 [#1]
Oct 18 01:47:38 (none) kernel: SMP
Oct 18 01:47:38 (none) kernel: Modules linked in: rtc
Oct 18 01:47:38 (none) kernel: CPU:    0
Oct 18 01:47:38 (none) kernel: EIP:    0060:[touch_atime+0x7/0xaf]    Not tainted VLI
Oct 18 01:47:38 (none) kernel: EFLAGS: 00010286   (2.6.22.9 #1)
Oct 18 01:47:38 (none) kernel: EIP is at touch_atime+0x7/0xaf
Oct 18 01:47:38 (none) kernel: eax: cffe1120   ebx: 00000000   ecx: cffe1120   edx: cde9cd10
Oct 18 01:47:38 (none) kernel: esi: c6a02aa4   edi: 00000001   ebp: c105eee0   esp: c7575e00
Oct 18 01:47:38 (none) kernel: ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068
Oct 18 01:47:38 (none) kernel: Process build (pid: 8230, ti=c7574000 task=c1399a50 task.ti=c7574000)
Oct 18 01:47:38 (none) kernel: Stack: c6a02aec c6a02aa4 c02029d2 c1254840 c519fea4 c6a02afc c6a02af4 0000006d
Oct 18 01:47:38 (none) kernel:        fffffffa cff49c20 00000000 c6a02a74 00000000 0000006d 00000004 c105eee0
Oct 18 01:47:38 (none) kernel:        00000000 c6a02b48 c7575e68 c013d886 000000d0 c6a02b4c cff49c20 c6a02b58
Oct 18 01:47:38 (none) kernel: Call Trace:
Oct 18 01:47:38 (none) kernel:  [unionfs_readpage+0x1ea/0x30b] unionfs_readpage+0x1ea/0x30b
Oct 18 01:47:38 (none) kernel:  [__do_page_cache_readahead+0x191/0x1e4] __do_page_cache_readahead+0x191/0x1e4
Oct 18 01:47:38 (none) kernel:  [unionfs_file_revalidate+0xae1/0xaee] unionfs_file_revalidate+0xae1/0xaee
Oct 18 01:47:38 (none) kernel:  [unionfs_file_revalidate+0xae1/0xaee] unionfs_file_revalidate+0xae1/0xaee
Oct 18 01:47:38 (none) kernel:  [filemap_nopage+0x14d/0x294] filemap_nopage+0x14d/0x294
Oct 18 01:47:38 (none) kernel:  [__handle_mm_fault+0x159/0x7fd] __handle_mm_fault+0x159/0x7fd
Oct 18 01:47:38 (none) kernel:  [dput+0x21/0xe6] dput+0x21/0xe6
Oct 18 01:47:38 (none) kernel:  [__fput+0x124/0x145] __fput+0x124/0x145
Oct 18 01:47:38 (none) kernel:  [do_page_fault+0x20d/0x516] do_page_fault+0x20d/0x516
Oct 18 01:47:38 (none) kernel:  [do_page_fault+0x0/0x516] do_page_fault+0x0/0x516
Oct 18 01:47:38 (none) kernel:  [error_code+0x72/0x78] error_code+0x72/0x78
Oct 18 01:47:38 (none) kernel:  =======================
Oct 18 01:47:38 (none) kernel: Code: 89 d8 ba 01 00 00 00 5b e9 c9 6f 00 00 ba 01 00 00 00 89 4b 54 89 43 50 eb d8 89 4b 5c 89 43 58 eb de 5b c3 56 89 c1 53 8b 5a 0c  83 34 01 00 00 02 0f 85 95 00 00 00 8b b3 98 00 00 00 8b 46
Oct 18 01:47:38 (none) kernel: EIP: [touch_atime+0x7/0xaf] touch_atime+0x7/0xaf SS:ESP 0068:c7575e00
Oct 18 01:47:38 (none) kernel: unionfs: find_lock_page failed

Have anyone seen this before?

Kind regards,

John Nielsen
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