Date: Tue, 21 Jul 2015 05:57:34 -0700 From: David Wolfskill <david@catwhisker.org> To: current@freebsd.org Subject: panic: witness_warn head/amd64 @r285741 on 1 of 2 machines Message-ID: <20150721125734.GF1217@albert.catwhisker.org>
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My laptop had no problems, but the build machine has a panic that
appears quite reproducible (4 "successes" out of 4 tries); here's a bit
=66rom the core.txt file:
freebeast.catwhisker.org dumped core - see /var/crash/vmcore.1
Tue Jul 21 05:36:11 PDT 2015
FreeBSD freebeast.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #1787 r=
285741M/285741:1100077: Tue Jul 21 04:48:37 PDT 2015 root@freebeast.cat=
whisker.org:/common/S4/obj/usr/src/sys/GENERIC amd64
panic: witness_warn
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...
Unread portion of the kernel message buffer:
panic: witness_warn
cpuid =3D 3
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe083b9c0=
860
vpanic() at vpanic+0x189/frame 0xfffffe083b9c08e0
kassert_panic() at kassert_panic+0x132/frame 0xfffffe083b9c0950
witness_warn() at witness_warn+0x498/frame 0xfffffe083b9c0a20
ithread_loop() at ithread_loop+0x165/frame 0xfffffe083b9c0a70
fork_exit() at fork_exit+0x84/frame 0xfffffe083b9c0ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe083b9c0ab0
--- trap 0, rip =3D 0, rsp =3D 0xfffffe083b9c0b70, rbp =3D 0 ---
=2E..
(kgdb) #0 doadump (textdump=3D0) at pcpu.h:221
#1 0xffffffff80377dfe in db_dump (dummy=3D<value optimized out>, dummy2=3D=
false,=20
dummy3=3D0, dummy4=3D0x0) at /usr/src/sys/ddb/db_command.c:533
#2 0xffffffff80377971 in db_command (cmd_table=3D0x0)
at /usr/src/sys/ddb/db_command.c:440
#3 0xffffffff80377604 in db_command_loop ()
at /usr/src/sys/ddb/db_command.c:493
#4 0xffffffff8037a19b in db_trap (type=3D<value optimized out>, code=3D0)
at /usr/src/sys/ddb/db_main.c:251
#5 0xffffffff80a56624 in kdb_trap (type=3D3, code=3D0, tf=3D<value optimiz=
ed out>)
at /usr/src/sys/kern/subr_kdb.c:654
#6 0xffffffff80e61bd1 in trap (frame=3D0xfffffe083b9c0790)
at /usr/src/sys/amd64/amd64/trap.c:540
#7 0xffffffff80e41e02 in calltrap ()
at /usr/src/sys/amd64/amd64/exception.S:235
#8 0xffffffff80a55cfe in kdb_enter (why=3D0xffffffff8136f098 "panic",=20
msg=3D0xffffffff80a5bee0 "UH\211<E5>AWAVATSH\203<EC>PI\211<F7>A\211<FE>=
H\213\004%<D0><C7><B8>\201H\211E<D8>\201<%x<D7><B8>\201") at cpufunc.h:63
#9 0xffffffff80a19739 in vpanic (fmt=3D<value optimized out>,=20
ap=3D<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:737
#10 0xffffffff80a19582 in kassert_panic (fmt=3D<value optimized out>)
at /usr/src/sys/kern/kern_shutdown.c:634
#11 0xffffffff80a74908 in witness_warn (flags=3D2, lock=3D<value optimized =
out>,=20
fmt=3D0xffffffff81367827 "suspending ithread")
at /usr/src/sys/kern/subr_witness.c:1757
#12 0xffffffff809e2985 in ithread_loop (arg=3D0xfffff8000770c820)
at /usr/src/sys/kern/kern_intr.c:1345
#13 0xffffffff809df874 in fork_exit (
callout=3D0xffffffff809e2820 <ithread_loop>, arg=3D0xfffff8000770c820,=
=20
frame=3D0xfffffe083b9c0ac0) at /usr/src/sys/kern/kern_fork.c:1006
#14 0xffffffff80e4233e in fork_trampoline ()
at /usr/src/sys/amd64/amd64/exception.S:610
#15 0x0000000000000000 in ?? ()
Current language: auto; currently minimal
(kgdb)=20
On boot, it dropped into the debugger; it was on the most recent
instantiation that I manually issued a "dump" command from that
environment, then rebooted under the previous kernel:
FreeBSD freebeast.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #1786 r=
285715M/285715:1100077: Mon Jul 20 04:22:26 PDT 2015 root@freebeast.cat=
whisker.org:/common/S3/obj/usr/src/sys/GENERIC amd64
(And yes, it runs an unmodified GENERIC kernel.)
The machine has been deployed only for a couple of months or so,
but has been building stable/10 and head daily during that time.
Until a couple of weeks ago, it was doing this for both i386 and
amd64; since then, I dropped i386 from my home infrastructure, so
it's been only amd64.
In the stable/10 environment, it also make use of a 3-spindle zraid for
running poudriere (to build the ports for my "production" machines), and
it's been doing that quite well, also.
Only other thing that I think of that's noteworthy is that its boot
drive is an SSD (where I have not yet enabled TRIM, as it's a Crucial
M500, and I need to be sure we don't try to use the queued TRIM commands
on it, as there are reports that queued TRIM commands on the M500 will
corrupt data).
OK; please see <http://www.catwhisker.org/~david/FreeBSD/head/>; for the
dump(-related) files. (It's on a residential ADSL, so it's going to be
slow. Sorry; I have a limited amount of bandwidth.)
Peace,
david
--=20
David H. Wolfskill david@catwhisker.org
Those who murder in the name of God or prophet are blasphemous cowards.
See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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