Date: Mon, 1 Feb 2010 11:15:17 +0100 From: Giovanni Trematerra <giovanni.trematerra@gmail.com> To: Aioanei Rares <bsdlisten@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: kernel fault when doing some I/O Message-ID: <4e6cba831002010215h781e757yf5b329ff305fc2be@mail.gmail.com> In-Reply-To: <20100131213630.854ff720.bsdlisten@gmail.com> References: <20100131213630.854ff720.bsdlisten@gmail.com>
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On Sun, Jan 31, 2010 at 8:36 PM, Aioanei Rares <bsdlisten@gmail.com> wrote: > > Hi everyone, > > I've been getting this several times but only now I could get a screensho= t (it's a X-less VirtualBox host) > The message I'm getting is the following : > > lock order reversal : > =A01st 0xffffff800a4c8698 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c= :2559 > =A02nd 0xffffff0002b81000 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_di= rhash.c:285 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2a > _witness_debugger() at _witness_debugger+0x2e > witness_checkorder() at witness_checkorder+0x81e > _sx_xlock() at _sx_lock+0x55 > ufsdirhash_acquire() at ufsdirhash_acquire+0x33 > ufsdirhash_add() at ufsdirhash_add+0x19 > ufs_direnter() at ufs_direnter+0x889 > ufs_makeinode() at ufs_makeinode+0x38a > VOP_CREATE_APV() at VOP_CREATE_APV+0x8d > vn_open_cred() at vn_open_cred+0x473 > kern_openat() at kern_openat+0x179 > syscall() at syscall+0x1ae > Xfast_syscall() at Xfast_syscall+0xe1 > --- syscall (5, FreeBSD ELF64, open), rip =3D 0x800c1095c, rsp =3D 0x7fff= ff1f9b38, rbp =3D 0x800e0a900 --- > That isn't a kernel fault but a LOR. you can read more on LOR at http://sources.zabbadoz.net/freebsd/lor.html. You got it because you compile your kernel with WITNESS option. Bye -- Gianni
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