Hi Konstantin, Hi Palle, On 18/09/15 18:06, Konstantin Belousov wrote: > 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.
Thanks, this is useful. So far I did not find any path where tcp_twclose() can call INP_WUNLOCK without having the exclusive lock held, that makes this issue interesting. >> 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. I did not find any issues while testing 10.2 + VIMAGE on my side. Thus Palle what I would suggest: - First, test with stable/10 to see if by chance this issue has already been fixed in stable branch. - Second, if issue is still in stable/10, compile 10.2 kernel with these options: options DDB options DEADLKRES options INVARIANTS options INVARIANT_SUPPORT options WITNESS options WITNESS_SKIPSPIN To see where the original fault is coming from. Thanks. -- Julien
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