2.5.62 oops

2.5.62 oops

[Bob Johnson]

Running a stress test of 50 concurrent kernel tree cp's + md5sum the files on
2.5.62 results in the following:

Feb 17 21:53:41 livewire kernel: VFS: brelse: Trying to free free buffer
Feb 17 21:53:41 livewire kernel: buffer layer error at fs/buffer.c:1170
Feb 17 21:53:41 livewire kernel: Pass this trace through ksymoops for 
reporting
Feb 17 21:53:42 livewire kernel: Call Trace: [__brelse+53/64]  
[bh_lru_install+169/224]  [__find_get_block+113/128]  [__getblk+43/96]  
[ext3_getblk+171/752]  [ext3_bread+51/176]  [dx_probe+158/784]  
[ext3_bread+51/176]  [ext3_dx_find_entry+183/560]  [ext3_find_entry+989/1040]  
[journal_stop+346/496]  [ext3_dirty_inode+147/256]  [d_alloc+32/496]  
[ext3_lookup+90/256]  [real_lookup+192/240]  [do_lookup+159/176]  
[link_path_walk+833/1584]  [__user_walk+73/96]  [vfs_lstat+28/96]  
[sys_lstat64+27/64]  [syscall_call+7/11] 
Feb 17 21:53:42 livewire kernel: Call Trace: [<c0149e85>]  [<c014a049>]  
[<c014a0f1>]  [<c014a12b>]  [<c017edab>]  [<c017f023>]  [<c01824be>]  
[<c017f023>]  [<c0183227>]  [<c018313d>]  [<c018b81a>]  [<c0181b83>]  
[<c015de20>]  [<c01833fa>]  [<c0154880>]  [<c0154abf>]  [<c0154e11>]  
[<c0155559>]  [<c015095c>]  [<c0150ffb>]  [<c010941f>] 

Re: 2.5.62 oops

[Andrew Morton]

Bob Johnson <livewire@gentoo.org> wrote:
>
> Running a stress test of 50 concurrent kernel tree cp's + md5sum the files on
> 2.5.62 results in the following:
> 
> Feb 17 21:53:41 livewire kernel: VFS: brelse: Trying to free free buffer
> Feb 17 21:53:41 livewire kernel: buffer layer error at fs/buffer.c:1170
> Feb 17 21:53:41 livewire kernel: Pass this trace through ksymoops for 
> reporting

It's not really an oops, although the bug which this is reporting could cause
a crash.

It is a known problem in the htree indexed directory code.  I can reproduce
it, but haven't had time to work on it.  Chris Li has time to work on it,
but cannot reproduce it.

We'll get there.