[Lustre-discuss] ras_stride_increase_window() ASSERTION failed

[Christopher J.Walker]

Tom.Wang wrote:
> Hello,
> 
> you need the patch in bug 17197, attachment
> 
> https://bugzilla.lustre.org/attachment.cgi?id=28672
> 
> and probably also the patch in
> 
> https://bugzilla.lustre.org/show_bug.cgi?id=22385
> 

Thanks for the very quick reply.

I've recompiled the patchless client with both these patches and have 
installed it on our machines. I've been running a test for the last 6 
hours, and initial signs are very good - no repeat of the error message 
on any of the machines.

Chris

> Thanks
> WangDi
> 
> 
> Christopher J. Walker wrote:
>> I see the following error in the logs on some of my lustre clients:
>>
>>     Mar 29 20:58:43 cn507 kernel: LustreError:        
>> 18750:0:(rw.c:1948:ras_stride_increase_window())
>>     ASSERTION(ras->ras_window_
>>     start + ras->ras_window_len >= ras->ras_stride_offset) failed:
>>     window_start 1792, window_len 0 stride_offset 2017
>>
>> Several processes seem to be blocking on this machine in state DN.
>>
>> Is this a known issue? I've looked in bugzilla and not found anything 
>> obvious (but this is the first time I've looked in your bugzilla). 
>> I've found 
>> http://www.nersc.gov/hypermail/nersc-io/att-0612/summary.pdf and had a 
>> quick flick through, but it refers to mpi-io, which we are not doing, 
>> and a 1.6 kernel, whereas we are running 1.8.
>>
>> I'm running 1.8.2 servers (downloaded from Sun/Oracle), and 1.8.2 
>> clients compiled from source on a Scientific Linux 2.6.18-164.15.1.el5 
>> kernel.
>>
>>  /var/log/messages says:
>>
>>> Mar 29 20:58:43 cn507 kernel: LustreError: 
>>> 18750:0:(rw.c:1948:ras_stride_increase_window()) 
>>> ASSERTION(ras->ras_window_
>>> start + ras->ras_window_len >= ras->ras_stride_offset) failed: 
>>> window_start 1792, window_len 0 stride_offset 2017
>>> Mar 29 20:58:43 cn507 kernel: LustreError: 
>>> 18750:0:(rw.c:1948:ras_stride_increase_window()) LBUG
>>> Mar 29 20:58:43 cn507 kernel: Pid: 18750, comm: athena.py
>>> Mar 29 20:58:43 cn507 kernel: Mar 29 20:58:43 cn507 kernel: Call Trace:
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8844d6a1>] 
>>> libcfs_debug_dumpstack+0x51/0x60 [libcfs]
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8844dbda>] 
>>> lbug_with_loc+0x7a/0xd0 [libcfs]
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8878d63f>] 
>>> ll_readpage+0x129f/0x1e40 [lustre]
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8000c707>] 
>>> add_to_page_cache+0xaa/0xc1
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8000c2f5>] 
>>> do_generic_mapping_read+0x208/0x354
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8000d0e0>] 
>>> file_read_actor+0x0/0x159
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8000c58d>] 
>>> __generic_file_aio_read+0x14c/0x198
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff800c5d8f>] 
>>> generic_file_readv+0x8f/0xa8
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff800a0307>] 
>>> autoremove_wake_function+0x0/0x2e
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8879a427>] 
>>> our_vma+0x117/0x1d0 [lustre]
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8000b984>] 
>>> touch_atime+0x67/0xaa
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8875f65b>] 
>>> ll_file_readv+0x1e4b/0x2130 [lustre]
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8875f95a>] 
>>> ll_file_read+0x1a/0x20 [lustre]
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8000b695>] vfs_read+0xcb/0x171
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff80011b60>] sys_read+0x45/0x6e
>>> Mar 29 20:58:43 cn507 kernel:  [<ffffffff8006149d>] 
>>> sysenter_do_call+0x1e/0x76
>>> Mar 29 20:58:43 cn507 kernel: Mar 29 20:58:43 cn507 kernel: 
>>> LustreError: dumping log to /tmp/lustre-log.1269892723.18750
>>
>> Thanks,
>>
>> Chris
>> ------------------------------------------------------------------------
>>
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