Date: Tue, 18 Mar 2008 22:11:09 +0300 From: pluknet <pluknet@gmail.com> To: "Attilio Rao" <attilio@freebsd.org> Cc: freebsd-current@freebsd.org, Alex Goncharov <alex-goncharov@comcast.net> Subject: Re: Seeing lock order reversal Message-ID: <a31046fc0803181211q298da2c3v73fa8fb9f356dba9@mail.gmail.com> In-Reply-To: <3bbf2fe10803181145m79e89955re785e1b5048cafd7@mail.gmail.com> References: <E1JbP4P-0000hU-L3@daland.home> <a31046fc0803171959n65faaf0oc9fc248ebdd8abd3@mail.gmail.com> <3bbf2fe10803181145m79e89955re785e1b5048cafd7@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 18/03/2008, Attilio Rao <attilio@freebsd.org> wrote: > 2008/3/18, pluknet <pluknet@gmail.com>: > > > > Thought taking that into account I could obtain a new one yesterday. I > > didn't see this before. > > > > Mar 17 03:17:14 pl sudo: pluknet : TTY=ttyv1 ; PWD=/usr/home/pluknet > > ; USER=root ; COMMAND=/usr/libexec/getty 3wire.9600 ttyd0 > > Mar 17 03:17:14 pl kernel: lock order reversal: > > Mar 17 03:17:14 pl kernel: 1st 0xc07e9274 proctree (proctree) @ > > /usr/src/sys/kern/kern_exit.c:291 > > Mar 17 03:17:14 pl kernel: 2nd 0xc2fc49e8 devfs (devfs) @ > > /usr/src/sys/kern/vfs_subr.c:2158 > > > This one seems interesting. > Next time you experience it can you please drop in DDB and print-out > the correct order revealed by WITNESS? > Fortunately I could reproduce it. lock order reversal: 1st 0xc07e9274 proctree (proctree) @ /usr/src/sys/kern/kern_exit.c:291 2nd 0xc3c18278 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2158 KDB: stack backtrace: db_trace_self_wrapper(c07682d0,d6078b24,c0573236,c076a615,c3c18278,...) at db_trace_self_wrapper+0x26 kdb_backtrace(c076a615,c3c18278,c075bcfb,c075bcfb,c0770a8c,...) at kdb_backtrace+0x29 witness_checkorder(c3c18278,9,c0770a8c,86e,c07edcd4,...) at witness_checkorder+0x6d6 _lockmgr_args(c3c18278,20002,c3c182a8,0,ffffffff,...) at _lockmgr_args+0x519 vop_stdlock(d6078bc4,d6078bbc,c0572a1c,20002,c3c182a8,...) at vop_stdlock+0x51 VOP_LOCK1_APV(c07a07e0,d6078bc4,851,d6078be4,c3c182a8,...) at VOP_LOCK1_APV+0xa5 _vn_lock(c3c18220,20002,c0770a8c,86e,4,...) at _vn_lock+0xf2 vrele(c3c18220,0,c07619a2,14e,ffffffff,...) at vrele+0x142 exit1(c2fdd690,0,d6078d2c,c0729ed3,c2fdd690,...) at exit1+0x8a1 sys_exit(c2fdd690,d6078cfc,4,c07625a5,c07a3d38,...) at sys_exit+0x1d syscall(d6078d38) at syscall+0x2b3 Xint0x80_syscall() at Xint0x80_syscall+0x20 --- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x2811964f, esp = 0xbfbfeacc, ebp = 0xbfbfead8 --- Something else? wbr, pluknet
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?a31046fc0803181211q298da2c3v73fa8fb9f356dba9>