On Fri, 6 Nov 2015, John D. Baker wrote:
Shortly after updating my file server to the latest 7.0_STABLE:
NetBSD yggdrasil.technoskunk.fur 7.0_STABLE NetBSD 7.0_STABLE (YGGDRASIL) #120:
Fri Nov 6 08:52:21 CST 2015
sy...@yggdrasil.technoskunk.fur:/r0/build/netbsd-7/obj/amd64/sys/arch/amd64/compile/YGGDRASIL
amd64
the machine panicked. Upon reboot, the saved crash dump showed:
$ crash -M netbsd.2.core -N netbsd.2
Crash version 7.0_STABLE, image version 7.0_STABLE.
System panicked: trap
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NAGR() at 0
_KERNEL_OPT_NAGR() at 0
vpanic() at vpanic+0x145
snprintf() at snprintf
startlwp() at startlwp
calltrap() at calltrap+0x11
VOP_PUTPAGES() at VOP_PUTPAGES+0x3a
uvm_pageout() at uvm_pageout+0x2f1
crash>
This would seem to be at
(gdb) list *uvm_pageout+0x2f1
0xffffffff802d1bb3 is in uvm_pageout
(/build/netbsd-local/src/sys/uvm/uvm_pdaemon.c:495).
490 KASSERT(swc->swc_nused < swc->swc_nallocated);
491 KASSERT((pg->pqflags & PQ_SWAPBACKED) != 0);
492
493 slot = swc->swc_slot + swc->swc_nused;
494 uobj = pg->uobject;
495 if (uobj == NULL) {
496 KASSERT(mutex_owned(pg->uanon->an_lock));
497 pg->uanon->an_swslot = slot;
498 } else {
499 int result;
(gdb)
I don't have any further insight - I'm not at all familiar with the
pagedaemon code.
The machine was building a -current release at the time as well as
serving the various src/xsrc/pkgsrc trees to two NFS clients building
-current for other architectures. Also serving my home directory to
a third client.
The "_KERNEL_OPT_NAGR()" statements are puzzling. They would appear to
refer to the "agr" link-aggregation pseudo-device, but the running kernel
omits that device, including GENERIC, then using "no pseudo-device agr".
I don't know if I can repeat it, but if it happens again, I'll make note
of it. Anything else to look at in the crashdump?
--
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