Re: Instant panic while trying run ports-mgmt/poudriere

Pawel Pekala wrote this message on Tue, Jul 14, 2015 at 22:47 +0200:
> On 2015-07-13 23:28 +0200, Mateusz Guzik <mjguzik_at_gmail.com> wrote:
> >On Mon, Jul 13, 2015 at 11:12:05PM +0200, Pawel Pekala wrote:
> >> Hi
> >> 
> >> I'm getting 100% reproducible kernel crash while trying build ports
> >> with poudriere on my system. This started to show up about 2-3 weeks
> >> ago. I upgrade my system on weekly basis usually on saturday.
> >> Here's backtrace:
> >> 
> >> (kgdb) bt
> >[..]
> >>     at /hdd/src/sys/amd64/amd64/trap.c:201
> >> #25 0xffffffff80dace32 in calltrap ()
> >> at /hdd/src/sys/amd64/amd64/exception.S:235 #26 0xffffffff80941430
> >> in knote (list=0xfffff801a2589408, hint=2147483648, lockflags=<value
> >> optimized out>) at /hdd/src/sys/kern/kern_event.c:1920 #27
> >> 0xffffffff80946a51 in exit1 (td=0xfffff801b84014d0, rv=<value
> >> optimized out>) at /hdd/src/sys/kern/kern_exit.c:560 #28
> >> 0xffffffff80945f1e in sys_sys_exit (td=0x0, uap=<value optimized
> >> out>) at /hdd/src/sys/kern/kern_exit.c:178 #29 0xffffffff80dcdaa2 in
> >> out>amd64_syscall (td=0xfffff801b84014d0, traced=0)
> >>     at subr_syscall.c:133
> >> #30 0xffffffff80dad11b in Xfast_syscall ()
> >> at /hdd/src/sys/amd64/amd64/exception.S:395 #31 0x0000000800922eea
> >> in ?? () Previous frame inner to this frame (corrupt stack?)
> >> Current language:  auto; currently minimal
> >> 
> >> Let me know if you need more details.
> >
> >
> >Well, if the problem is really that reproducible it would be best if
> >you narrowed it down to the exact commit.
> >
> >However, quick look suggests you may be a "victim" of r284861.
> 
> After further testing I can confirm that this panic was introduced in
> r284861, thanks for the hint!

Can you tell me what your line 1920 of kern_event.c is? (and the context
around it?   Or at least the $FreeBSD$ line from kern_event.c?  Because
in HEAD, the line is:
		} else if ((lockflags & KNF_NOKQLOCK) != 0) {

and there isn't a way to fault on that code...

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     "All that I will do, has been done, All that I have, has not."