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 from 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 r285741M/285741:1100077: Tue Jul 21 04:48:37 PDT 2015 r...@freebeast.catwhisker.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 conditions. 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 = 3 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe083b9c0860 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 = 0, rsp = 0xfffffe083b9c0b70, rbp = 0 --- ... (kgdb) #0 doadump (textdump=0) at pcpu.h:221 #1 0xffffffff80377dfe in db_dump (dummy=<value optimized out>, dummy2=false, dummy3=0, dummy4=0x0) at /usr/src/sys/ddb/db_command.c:533 #2 0xffffffff80377971 in db_command (cmd_table=0x0) 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=<value optimized out>, code=0) at /usr/src/sys/ddb/db_main.c:251 #5 0xffffffff80a56624 in kdb_trap (type=3, code=0, tf=<value optimized out>) at /usr/src/sys/kern/subr_kdb.c:654 #6 0xffffffff80e61bd1 in trap (frame=0xfffffe083b9c0790) 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=0xffffffff8136f098 "panic", msg=0xffffffff80a5bee0 "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=<value optimized out>, ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:737 #10 0xffffffff80a19582 in kassert_panic (fmt=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:634 #11 0xffffffff80a74908 in witness_warn (flags=2, lock=<value optimized out>, fmt=0xffffffff81367827 "suspending ithread") at /usr/src/sys/kern/subr_witness.c:1757 #12 0xffffffff809e2985 in ithread_loop (arg=0xfffff8000770c820) at /usr/src/sys/kern/kern_intr.c:1345 #13 0xffffffff809df874 in fork_exit ( callout=0xffffffff809e2820 <ithread_loop>, arg=0xfffff8000770c820, frame=0xfffffe083b9c0ac0) 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) 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 r285715M/285715:1100077: Mon Jul 20 04:22:26 PDT 2015 r...@freebeast.catwhisker.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 -- David H. Wolfskill da...@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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