Re: lock order reversal bufwait/dirhash

On Jun 9, 2010, at 12:51 AM, Bernd Walter wrote:

> Got this during installworld (source on NFS, destination UFS on CF-card)
> Source is current checked out yesterday.
> 
> lock order reversal:
> 1st 0xc28b85b4 bufwait (bufwait) _at_ /data/builder/c13-2010-06-07/head/sys/kern/vfs_bio.c:2575
> 2nd 0xc343f000 dirhash (dirhash) _at_ /data/builder/c13-2010-06-07/head/sys/ufs/ufs/ufs_dirhash.c:283
> KDB: stack backtrace:
> db_trace_self_wrapper(c0905b2b,c0d02c56,c2d3d030,c2d40500,ca657890,...) at db_trace_self_wrapper+0x26
> _witness_debugger(c0d02c56,c343f000,c0d279c2,c2d40500,c0d2762e,...) at _witness_debugger+0x25
> witness_checkorder(c343f000,9,c0d2762e,11b,0,...) at witness_checkorder+0x73c
> _sx_xlock(c343f000,0,c0d2762e,11b,c3a07e80,...) at _sx_xlock+0x51
> ufsdirhash_acquire(e,1828,ca6579f0,c3a07e80,cb2bd814,...) at ufsdirhash_acquire+0x35
> ufsdirhash_add(c3a07e80,ca6579f0,1828,ca657950,ca657954,...) at ufsdirhash_add+0x1f
> ufs_direnter(c3944dd0,c423e220,ca6579f0,ca657bd0,c292ccb0,...) at ufs_direnter+0x894
> ufs_mkdir(ca657bf8,ca657c0c,2,0,0,...) at ufs_mkdir+0x51c
> VOP_MKDIR_APV(c0e0f4c0,ca657bf8,ca657bd0,ca657b3c,2,...) at VOP_MKDIR_APV+0x8e
> kern_mkdirat(c39264e0,ffffff9c,80513e0,0,1c0,...) at kern_mkdirat+0x240
> kern_mkdir(c39264e0,80513e0,0,1c0,ca657c7c,...) at kern_mkdir+0x2f
> mkdir(c39264e0,ca657cec,ca657d28,c0d014f7,0,...) at mkdir+0x27
> syscallenter(c39264e0,ca657ce4,ca657ce4,0,c0e630c0,...) at syscallenter+0xc6
> syscall(ca657d28) at syscall+0x3a
> Xint0x80_syscall() at Xint0x80_syscall+0x20
> --- syscall (136, FreeBSD ELF32, mkdir), eip = 0x281817cf, esp = 0xbfbfe30c, ebp = 0xbfbfe398 ---

I've seen this for a while, but it was definitely present on the kernel that I tried working off of that was from Saturday.
Thanks,
-Garrett