[Bug 201912] panic in smbfs during mount

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201912

            Bug ID: 201912
           Summary: panic in smbfs during mount
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: martin at sugioarto.com

System coredumped while mounting smbfs shares from remote server.

Here the backtrace:

#0  doadump (textdump=<value optimized out>) at pcpu.h:219
#1  0xffffffff80927da2 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:452
#2  0xffffffff80928164 in panic (fmt=<value optimized out>) at
/usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80d258df in trap_fatal (frame=<value optimized out>, eva=<value
optimized out>) at /usr/src/sys/amd64/amd64/trap.c:865
#4  0xffffffff80d25bf8 in trap_pfault (frame=0xfffffe02293fe9b0,
usermode=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:676
#5  0xffffffff80d2525a in trap (frame=0xfffffe02293fe9b0) at
/usr/src/sys/amd64/amd64/trap.c:440
#6  0xffffffff80d0b142 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:232
#7  0xffffffff80974c3c in turnstile_broadcast (ts=0x0, queue=0) at
/usr/src/sys/kern/subr_turnstile.c:838
#8  0xffffffff80914c20 in __mtx_unlock_sleep (c=0xfffff8007961b138, opts=<value
optimized out>, file=0xffffffff81c32901 "ec", line=1) at
/usr/src/sys/kern/kern_mutex.c:761
#9  0xffffffff80914ba9 in __mtx_unlock_flags (c=<value optimized out>,
opts=<value optimized out>, file=0xffffffff81c32901 "ec", line=1) at
/usr/src/sys/kern/kern_mutex.c:254
#10 0xffffffff81c28054 in smb_iod_sendall () at
/usr/src/sys/modules/smbfs/../../netsmb/smb_iod.c:93
#11 0xffffffff81c28760 in smb_iod_thread (arg=0xfffff8007961b100) at
/usr/src/sys/modules/smbfs/../../netsmb/smb_iod.c:637
#12 0xffffffff808f8b6a in fork_exit (callout=0xffffffff81c28670
<smb_iod_thread>, arg=0xfffff8007961b100, frame=0xfffffe02293fec00) at
/usr/src/sys/kern/kern_fork.c:996
#13 0xffffffff80d0b67e in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:606
#14 0x0000000000000000 in ?? ()

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