On 2014-08-18 15:45, Ryan Stone wrote:
On Mon, Aug 18, 2014 at 11:21 AM, Larry Rosenman <l...@lerctr.org> wrote:
I got the following:

borg.lerctr.org dumped core - see /var/crash/vmcore.8

Mon Aug 18 07:30:42 CDT 2014

FreeBSD borg.lerctr.org 11.0-CURRENT FreeBSD 11.0-CURRENT #63 r269784M: Sun Aug 10 12:33:07 CDT 2014 r...@borg.lerctr.org:/usr/obj/usr/src/sys/VT-LER amd64

panic: deadlkres: possible deadlock detected for 0xfffff8002abeb000, blocked for 1800926 ticks

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Unread portion of the kernel message buffer:
panic: deadlkres: possible deadlock detected for 0xfffff8002abeb000, blocked for 1800926 ticks

cpuid = 3
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe100bff1a10
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe100bff1ac0
vpanic() at vpanic+0x126/frame 0xfffffe100bff1b00
panic() at panic+0x43/frame 0xfffffe100bff1b60
deadlkres() at deadlkres+0x35c/frame 0xfffffe100bff1bb0
fork_exit() at fork_exit+0x84/frame 0xfffffe100bff1bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe100bff1bf0
--- trap 0, rip = 0, rsp = 0xfffffe100bff1cb0, rbp = 0 ---
Uptime: 7d14h14m38s

The first thing that I'd like to see is (in kgdb):

set $td=(struct thread)0xfffff8002abeb000
tid $td->td_tid

That will show us the backtrace of the thread that was blocked for so long.
0  doadump (textdump=1) at pcpu.h:219
219     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) set $td=(struct thread)0xfffff8002abeb000
Invalid cast.
(kgdb) set $td=(struct thread*)0xfffff8002abeb000
Current language:  auto; currently minimal
(kgdb) tid $td->td_tid
[Switching to thread 469 (Thread 100681)]#0  sched_switch (
    td=0xfffff8002abeb000, newtd=<value optimized out>,
    flags=<value optimized out>) at /usr/src/sys/kern/sched_ule.c:1931
1931                    cpuid = PCPU_GET(cpuid);
(kgdb) bt
#0  sched_switch (td=0xfffff8002abeb000, newtd=<value optimized out>,
    flags=<value optimized out>) at /usr/src/sys/kern/sched_ule.c:1931
#1  0xffffffff80a107d9 in mi_switch (flags=260, newtd=0x0)
    at /usr/src/sys/kern/kern_synch.c:493
#2  0xffffffff80a4c442 in sleepq_switch (wchan=<value optimized out>,
pri=<value optimized out>) at /usr/src/sys/kern/subr_sleepqueue.c:552
#3  0xffffffff80a4c2a3 in sleepq_wait (wchan=0xfffff80070a4dd50, pri=96)
    at /usr/src/sys/kern/subr_sleepqueue.c:631
#4  0xffffffff809eb1fa in sleeplk (lk=<value optimized out>,
    flags=<value optimized out>, ilk=<value optimized out>,
    wmesg=<value optimized out>, pri=<value optimized out>,
    timo=<value optimized out>) at /usr/src/sys/kern/kern_lock.c:225
#5  0xffffffff809eaa06 in __lockmgr_args (lk=0xfffff80070a4dd50,
    flags=<value optimized out>, ilk=0xfffff80070a4dd80,
    wmesg=<value optimized out>, pri=<value optimized out>,
    timo=<value optimized out>) at /usr/src/sys/kern/kern_lock.c:931
#6 0xffffffff8092e092 in nfs_lock1 (ap=<value optimized out>) at lockmgr.h:97
#7  0xffffffff80f2d57c in VOP_LOCK1_APV (vop=<value optimized out>,
    a=<value optimized out>) at vnode_if.c:2082
#8  0xffffffff80abd22a in _vn_lock (vp=0xfffff80070a4dce8,
    flags=<value optimized out>,
    file=0xffffffff8110db88 "/usr/src/sys/kern/vfs_subr.c", line=2137)
    at vnode_if.h:859
#9  0xffffffff80aad4e7 in vget (vp=0xfffff80070a4dce8, flags=524544,
---Type <return> to continue, or q <return> to quit---
    td=0xfffff8002abeb000) at /usr/src/sys/kern/vfs_subr.c:2137
#10 0xffffffff80aa1491 in vfs_hash_get (mp=0xfffff8002aa1e990,
    hash=1741450670, flags=<value optimized out>, td=0xfffff8002abeb000,
    vpp=0xfffffe100c75c670, fn=0xffffffff80935820 <newnfs_vncmpf>)
    at /usr/src/sys/kern/vfs_hash.c:88
#11 0xffffffff809314bd in ncl_nget (mntp=0xfffff8002aa1e990,
    fhp=0xfffff80070ccf4a4 "\001", fhsize=12, npp=0xfffffe100c75c6e0,
    lkflags=<value optimized out>)
    at /usr/src/sys/fs/nfsclient/nfs_clnode.c:114
#12 0xffffffff809340fd in nfs_statfs (mp=0xfffff8002aa1e990,
sbp=0xfffff8002aa1ea48) at /usr/src/sys/fs/nfsclient/nfs_clvfsops.c:288
#13 0xffffffff80aa7ade in __vfs_statfs (mp=0x0, sbp=0xfffff8002aa1ea48)
    at /usr/src/sys/kern/vfs_mount.c:1706
#14 0xffffffff80ab4f5e in kern_getfsstat (td=0xfffff8002abeb000,
    buf=<value optimized out>, bufsize=<value optimized out>,
    bufseg=UIO_USERSPACE, flags=<value optimized out>)
    at /usr/src/sys/kern/vfs_syscalls.c:511
#15 0xffffffff80e1625a in amd64_syscall (td=0xfffff8002abeb000, traced=0)
    at subr_syscall.c:133
#16 0xffffffff80df760b in Xfast_syscall ()
    at /usr/src/sys/amd64/amd64/exception.S:390
#17 0x00000008010fc83a in ?? ()
Previous frame inner to this frame (corrupt stack?)
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640 (c)     E-Mail: l...@lerctr.org
US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
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