Date: Fri, 18 Sep 2015 19:06:05 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Julien Charbon <jch@freebsd.org> Cc: Palle Girgensohn <girgen@FreeBSD.org>, freebsd-net@freebsd.org Subject: Re: Kernel panics in tcp_twclose Message-ID: <20150918160605.GN67105@kib.kiev.ua> In-Reply-To: <55FC1809.3070903@freebsd.org> References: <26B0FF93-8AE3-4514-BDA1-B966230AAB65@FreeBSD.org> <55FC1809.3070903@freebsd.org>
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On Fri, Sep 18, 2015 at 03:56:25PM +0200, Julien Charbon wrote: > Hi Palle, > > On 18/09/15 11:12, Palle Girgensohn wrote: > > We see daily panics on our production systems (web server, apache > > running MPM event, openjdk8. Kernel with VIMAGE. Jails using netgraph > > interfaces [not epair]). > > > > The problem started after the summer. Normal port upgrades seems to > > be the only difference. The problem occurs with 10.2-p2 kernel as > > well as 10.1-p4 and 10.1-p15. > > > > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203175 > > > > Any ideas? > > Thanks for you detailed report. I am not aware of any tcp_twclose() > related issues (without VIMAGE) since FreeBSD 10.0 (does not mean there > are none). Few interesting facts (at least for me): > > - Your crash happens when unlocking a inp exclusive lock with INP_WUNLOCK() > > - Something is already wrong before calling turnstile_broadcast() as it > is called with ts = NULL: In the kernel without witness this is a 99%-sure indication of attempt to unlock not owned lock. > > turnstile_broadcast (ts=0x0, queue=1) at > /usr/src/sys/kern/subr_turnstile.c:838 > __rw_wunlock_hard () at /usr/src/sys/kern/kern_rwlock.c:988 > tcp_twclose () at /usr/src/sys/netinet/tcp_timewait.c:540 > tcp_tw_2msl_scan () at /usr/src/sys/netinet/tcp_timewait.c:748 > tcp_slowtimo () at /usr/src/sys/netinet/tcp_timer.c:198 > > I won't go to far here as I am not expert enough in VIMAGE, but one > question anyway: > > - Can you correlate this kernel panic to a particular event? Like for > example a VIMAGE/VNET jail destruction. > > I will test that on my side on a 10.2 machine. > > -- > Julien >
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