Re: linux-2.6.27-rc3: kernel BUG at fs/nfs/write.c:252

["J. Bruce Fields" <bfields@fieldses.org>]

On Fri, Aug 22, 2008 at 09:35:20AM +0200, Le Rouzic wrote:
> Hi,
> Client and server On Intel X86_64 with linux-2.6.27-rc3.
>
> Doing several stress benchmarks simultaneously:
> fsstress
> iozone   (without  -U )
> fsx
> ffsb
> cthon
>
> The server crashed.
>
> Here is the trace on the server:

You're sure it's the server?  This crash is in client code.

--b.

> ------------[ cut here ]------------
> kernel BUG at fs/nfs/write.c:252!
>
> Entering kdb (current=0xffff8800621c78d0, pid 25953) on processor 1 due to
> KDB_ENTER()
> [1]kdb> bt
> Stack traceback for pid 25953
> 0xffff8800621c78d0    25953     5308  1    1   R  0xffff8800621c7c38 *fsx-linux
> sp                ip                Function (args)
> 0xffff8800660cdb88 0xffffffff80330871 nfs_do_writepage+0xe7
> (0xffffe20001770140, invalid, 0xffff8800660cdd18)
> 0xffff8800660cdbf0 0xffffffff80330cd0 nfs_writepages_callback+0xf
> (0xffffe20001770140)
> 0xffff8800660cdc10 0xffffffff802657f9 write_cache_pages+0x1ca
> (0xffff880062402468, 0xffff8800660cddc8, 0xffffffff80330cc1,
> 0xffff8800660cdd18)
> 0xffff8800660cdd10 0xffffffff80330c95 nfs_writepages+0x72 (0xffff880062402468,
> 0xffff8800660cddc8)
> 0xffff8800660cdd90 0xffffffff803315b6 __nfs_write_mapping+0x19
> (0xffff880062402468, 0xffff8800660cddc8, invalid)
> 0xffff8800660cddc0 0xffffffff80331655 nfs_write_mapping+0x68
> (0xffff880062402468, invalid)
> 0xffff8800660cde30 0xffffffff80331675 nfs_wb_nocommit+0x15 (invalid)
> 0xffff8800660cde40 0xffffffff80327638 nfs_getattr+0x5c (0xffff88007fbbf1c0,
> invalid, 0xffff8800660cdef8)
> 0xffff8800660cde80 0xffffffff8028c637 vfs_getattr+0x44 (0xffff88007fbbf1c0,
> 0xffff8800664e00b8, 0xffff8800660cdef8)
> 0xffff8800660cdec0 0xffffffff8028c687 vfs_fstat+0x33 (invalid,
> 0xffff8800660cdef8)
> 0xffff8800660cdef0 0xffffffff8028c6b8 sys_newfstat+0x1a (invalid,
> 0x7fffec90f890)
>  not matched: from 0xffffffff8020bead to 0xffffffff8020bf25 drop_through 0
> bb_jmp[7]
> bb_special_case: Invalid bb_reg_state.memory, missing trailing entries
> bb_special_case: on transfer to int_with_check
>  system_call_fastpath has memory parameters but no register parameters.
>  Assuming it is a 'pass through' function that does not refer to its register
>  parameters and setting 6 register parameters
> kdb_bb: 0xffffffff8020be3b [kernel]system_call_fastpath failed at
> 0xffffffff8020bec8
>
> Using old style backtrace, unreliable with no arguments
> sp                ip                Function (args)
> 0xffff8800660cdb88 0xffffffff80330871 nfs_do_writepage+0xe7
> 0xffff8800660cdbb0 0xffffffff80330871 nfs_do_writepage+0xe7
> 0xffff8800660cdbf0 0xffffffff80330cd0 nfs_writepages_callback+0xf
> 0xffff8800660cdc10 0xffffffff802657f9 write_cache_pages+0x1ca
> 0xffff8800660cdc20 0xffffffff80330cc1 nfs_writepages_callback
> 0xffff8800660cdc68 0xffffffff8032d3bc nfs_wait_bit_killable
> 0xffff8800660cdc80 0xffffffff80603a87 out_of_line_wait_on_bit+0x6e
> 0xffff8800660cdca8 0xffffffff8023f9b8 wake_bit_function
> 0xffff8800660cdd10 0xffffffff80330c95 nfs_writepages+0x72
> 0xffff8800660cdd50 0xffffffff80331c41 nfs_flush_one
> 0xffff8800660cdd90 0xffffffff803315b6 __nfs_write_mapping+0x19
> 0xffff8800660cddc0 0xffffffff80331655 nfs_write_mapping+0x68
> 0xffff8800660cde30 0xffffffff80331675 nfs_wb_nocommit+0x15
> 0xffff8800660cde40 0xffffffff80327638 nfs_getattr+0x5c
> 0xffff8800660cde80 0xffffffff8028c637 vfs_getattr+0x44
> 0xffff8800660cdec0 0xffffffff8028c687 vfs_fstat+0x33
> 0xffff8800660cdef0 0xffffffff8028c6b8 sys_newfstat+0x1a
> 0xffff8800660cdf40 0xffffffff80242540 up_write+0x9
> 0xffff8800660cdf50 0xffffffff802731c5 sys_munmap+0x4d
>
> Bug registered at:
>
>
>
> ------------------------------------------------------------- Bug:  
> http://bugzilla.linux-nfs.org/show_bug.cgi?id=168 
>
>
>
> Best Regards
>
> -- 
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> Name    : Aime Le Rouzic Mail    : Bull - BP 208 - 38432 Echirolles Cedex 
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