Date: Tue, 25 Mar 2008 14:20:50 +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: <a31046fc0803250420w60ab7a4aw8fe0e9d93ded313b@mail.gmail.com> In-Reply-To: <3bbf2fe10803181145m79e89955re785e1b5048cafd7@mail.gmail.com> References: <E1JbP4P-0000hU-L3@daland.home> <a31046fc0803171959n65faaf0oc9fc248ebdd8abd3@mail.gmail.com> <3bbf2fe10803181145m79e89955re785e1b5048cafd7@mail.gmail.com>
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On 18/03/2008, Attilio Rao <attilio@freebsd.org> wrote: > 2008/3/18, pluknet <pluknet@gmail.com>: > > > On 18/03/2008, Alex Goncharov <alex-goncharov@comcast.net> wrote: > > > [ Sorry if this is old news or not useful ] > > > > > > I am trying to source-upgrade one of my 7.0 systems to 8.0-CURRENT. > > > > > > In the following, when I say "build", it means "csup and build right > > > away". > > > > > > The very first 8.0 build (this morning) gave me the kernel that didn't > > > boot. Built it again, finishing about 15 minutes ago. This one > > > booted all right but I see this in `/var/log/messages': > > > > > > > [there was stripped LORs] > > > > It's due to recent WITNESS lockmgr support that unhides existing LORs. > > > > 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? > > Thanks, > Attilio > btw, I also see this message in dmesg after LOR: sio0: 170 more interrupt-level buffer overflows (total 170) - pluknet
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