[Bug 191882] Multiple panics when ctld is running

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191882

--- Comment #3 from Steven Peterson <scp at mainstream.net> ---
for the page fault ran kgdb got the following (following the instructions in
the handbook)
 (kgdb) backtrace
#0  doadump (textdump=<value optimized out>) at pcpu.h:219
#1  0xffffffff808af440 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:447
#2  0xffffffff808af804 in panic (fmt=<value optimized out>) at
/usr/src/sys/kern/kern_shutdown.c:754
#3  0xffffffff80c8de32 in trap_fatal (frame=<value optimized out>, eva=<value
optimized out>) at /usr/src/sys/amd64/amd64/trap.c:882
#4  0xffffffff80c8e109 in trap_pfault (frame=0xfffffe0838fbb730, usermode=0) at
/usr/src/sys/amd64/amd64/trap.c:699
#5  0xffffffff80c8d896 in trap (frame=0xfffffe0838fbb730) at
/usr/src/sys/amd64/amd64/trap.c:463
#6  0xffffffff80c74b32 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:232
#7  0xffffffff8089c531 in __mtx_lock_sleep (c=0xfffff80262b42de0,
tid=18446735277754427680, opts=-2117811456, file=0xfffff80008382900 "", line=2)
at /usr/src/sys/kern/kern_mutex.c:433
#8  0xffffffff8089c36d in __mtx_lock_flags (c=<value optimized out>,
opts=137898272, file=0xffffffff81c4c300 "NING: %s: failed to allocate %zd
bytes\n", line=137898240)
    at /usr/src/sys/kern/kern_mutex.c:224
#9  0xffffffff81c49aab in icl_pdu_queue (ip=0xfffff80262a38420) at
/usr/src/sys/modules/iscsi/../../dev/iscsi/icl.c:955
#10 0xffffffff81c2b81a in cfiscsi_pdu_queue (response=0xfffff80262a38420) at
/usr/src/sys/modules/ctl/../../cam/ctl/ctl_frontend_iscsi.c:390
#11 0xffffffff808c483c in softclock_call_cc (c=0xfffff800085c4c60,
cc=0xffffffff814f3180, direct=0) at /usr/src/sys/kern/kern_timeout.c:682
#12 0xffffffff808c4c84 in softclock (arg=0xffffffff814f3180) at
/usr/src/sys/kern/kern_timeout.c:810
#13 0xffffffff80883beb in intr_event_execute_handlers (p=<value optimized out>,
ie=0xfffff80008360800) at /usr/src/sys/kern/kern_intr.c:1263
#14 0xffffffff80884036 in ithread_loop (arg=0xfffff80008366de0) at
/usr/src/sys/kern/kern_intr.c:1276
#15 0xffffffff8088189a in fork_exit (callout=0xffffffff80883fa0 <ithread_loop>,
arg=0xfffff80008366de0, frame=0xfffffe0838fbbac0) at
/usr/src/sys/kern/kern_fork.c:995
#16 0xffffffff80c7506e in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:606
#17 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal
(kgdb) list *0xffffffff8089c531
0xffffffff8089c531 is in __mtx_lock_sleep (/usr/src/sys/kern/kern_mutex.c:434).
429             * owner stops running or the state of the lock changes.
430             */
431            v = m->mtx_lock;
432            if (v != MTX_UNOWNED) {
433                owner = (struct thread *)(v & ~MTX_FLAGMASK);
434                if (TD_IS_RUNNING(owner)) {
435                    if (LOCK_LOG_TEST(&m->lock_object, 0))
436                        CTR3(KTR_LOCK,
437                            "%s: spinning on %p held by %p",
438                            __func__, m, owner);

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