witness_checkorder panic

[Kostik Belousov]

On Sat, Dec 02, 2006 at 07:15:37PM +0100, Arno J. Klaassen wrote:
> 
> Hello,
> 
> I just got this on a box I'm testing before installation.
> It has clean RELENG_6 from about two weeks ago with only
> some small if_bge.c-patches Bruce Evans sent me for testing
> performance/hang problems.
> Since I doubt this panic is related to that, I just post
> it here in case someone is interested in more info :
> 
> [sorry, no serial console attached ... just copy-paste from
> screen, but I will leave the box in the debugger for the
> WE ]
> 
>   struct mount mtx (struct mount mtx) @ /files/bsd/src6/sys/ufs/ufs/ufs_vnops.c:138
>   KDB: stack backtrace :
>   witness_checkorder()
>   _mtx_lock_flags()
>   ufs_itimes()
>   ufs_getattr()
>   VOP_GETATTR_APV()
>   filt_vfsread()
>   knote()
>   VOP_WRITE_APV()
>   vn_write()
>   dofilewrite()
>   kern_writev()
>   write()
>   syscall()
>   Xfast_syscall()
>   --- syscall (4, FreeBSD ELF64, write), rip = 0x4363dc, rsp = 0X7fffffffdd78, rbp = 0x2f6 ---
>   KDB: enter: witness_checkorder
>   [thread pid 3987 tid 100133 ]
> 
> Kernel config is stripped GENERIC +
> 
>   options AHC_ALLOW_MEMIO
>   options TCP_DROP_SYNFIN
>   options         KDB
>   options         KDB_TRACE
>   options         DDB
>   options         KTRACE
>   options         INVARIANTS
>   options         INVARIANT_SUPPORT
>   options         DDB_NUMSYM
>   options         BREAK_TO_DEBUGGER
>   options         INVARIANTS
>   options         INVARIANT_SUPPORT
>   options         WITNESS
>   options         WITNESS_KDB
>   options         DEBUG_LOCKS
>   options         DEBUG_VFS_LOCKS
>   options         DIAGNOSTIC
>   options         MUTEX_PROFILING
>   options         MUTEX_DEBUG
>   options         SLEEPQUEUE_PROFILING
>   options         TURNSTILE_PROFILING
>   options         DEBUG_MEMGUARD
> 
> The box was doing (/usr/src nfs-mounted):
> 
>   nohup time make -j 2 -DNO_CLEAN buildworld > /tmp/bw_alone.log 2>&1 &
> 
> It paniced shortly after I started 'tail -f /tmp/bw_alone.log' in another
> window, and /tmp is mfs.

Please, try the patch at
http://people.freebsd.org/~kib/kqueue-lor.1.patch

[ I do not include it inline since spamfilter at freebsd.org notices the
get.*fast pattern in the patch. I need to rename this somehow. ]
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