smbfs crashes since approx. 10.1-RELEASE

[Christian Kratzer]

Hi,

I run a regular rsync job that runs from cron and copies stuff that gets created on a Windows smbfs share.

Starting about 10.1-RELEASE the VM has become unstable and started panicing.

I have narrowed the issue down to the aforementioned rsync job.

When I move the job to a different VM the the other VM starts crashing and the VM without the job becomes stable agin.

I have panics and crashinfos stored in /var/crash if anybody is interested:

     root at noc2:/var/crash # uname -a
     FreeBSD noc2.cksoft.de 10.2-RELEASE FreeBSD 10.2-RELEASE #0 r286666: Wed Aug 12 15:26:37 UTC 2015 root at releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64
     root at noc2:/var/crash # freebsd-version -u
     10.2-RELEASE-p5
     root at noc2:/var/crash # freebsd-version -k
     10.2-RELEASE
     root at noc2:/var/crash #

This is what I have in /var/crash/core.txt.0

     Fatal trap 12: page fault while in kernel mode
     cpuid = 0; apic id = 00
     fault virtual address   = 0x20
     fault code              = supervisor read data, page not present
     instruction pointer     = 0x20:0xffffffff80996c7c
     stack pointer           = 0x28:0xfffffe003d6c0ac0
     frame pointer           = 0x28:0xfffffe003d6c0af0
     code segment            = base 0x0, limit 0xfffff, type 0x1b
 			    = DPL 0, pres 1, long 1, def32 0, gran 1
     processor eflags        = resume, IOPL = 0
     current process         = 1349 (smbiod10)
     trap number             = 12
     panic: page fault
     cpuid = 0
     KDB: stack backtrace:
     #0 0xffffffff80984e30 at kdb_backtrace+0x60
     #1 0xffffffff809489e6 at vpanic+0x126
     #2 0xffffffff809488b3 at panic+0x43
     #3 0xffffffff80d4aadb at trap_fatal+0x36b
     #4 0xffffffff80d4addd at trap_pfault+0x2ed
     #5 0xffffffff80d4a47a at trap+0x47a
     #6 0xffffffff80d307f2 at calltrap+0x8
     #7 0xffffffff8092ebe0 at __mtx_unlock_sleep+0x60
     #8 0xffffffff8092eb69 at __mtx_unlock_flags+0x69
     #9 0xffffffff81a1b724 at smb_iod_thread+0xb4
     #10 0xffffffff8091244a at fork_exit+0x9a
     #11 0xffffffff80d30d2e at fork_trampoline+0xe
     Uptime: 2h43m55s
     Dumping 103 out of 999 MB: (CTRL-C to abort) ..16%..31%..47%..62%..78%..93%

     Reading symbols from /boot/kernel/smbfs.ko.symbols...done.
     Loaded symbols for /boot/kernel/smbfs.ko.symbols
     Reading symbols from /boot/kernel/libiconv.ko.symbols...done.
     Loaded symbols for /boot/kernel/libiconv.ko.symbols
     Reading symbols from /boot/kernel/libmchain.ko.symbols...done.
     Loaded symbols for /boot/kernel/libmchain.ko.symbols
     #0  doadump (textdump=<value optimized out>) at pcpu.h:219
     219     pcpu.h: No such file or directory.
 	    in pcpu.h
     (kgdb) #0  doadump (textdump=<value optimized out>) at pcpu.h:219
     #1  0xffffffff80948642 in kern_reboot (howto=260)
 	at /usr/src/sys/kern/kern_shutdown.c:451
     #2  0xffffffff80948a25 in vpanic (fmt=<value optimized out>,
 	ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:758
     #3  0xffffffff809488b3 in panic (fmt=0x0)
 	at /usr/src/sys/kern/kern_shutdown.c:687
     #4  0xffffffff80d4aadb in trap_fatal (frame=<value optimized out>,
 	eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:851
     #5  0xffffffff80d4addd in trap_pfault (frame=0xfffffe003d6c0a10,
 	usermode=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:674
     #6  0xffffffff80d4a47a in trap (frame=0xfffffe003d6c0a10)
 	at /usr/src/sys/amd64/amd64/trap.c:440
     #7  0xffffffff80d307f2 in calltrap ()
 	at /usr/src/sys/amd64/amd64/exception.S:236
     #8  0xffffffff80996c7c in turnstile_broadcast (ts=0x0, queue=0)
 	at /usr/src/sys/kern/subr_turnstile.c:838
     #9  0xffffffff8092ebe0 in __mtx_unlock_sleep (c=0xfffff80002df0390,
 	opts=<value optimized out>,
 	file=0xffffffff81a25801 "%s: Can't handle disordered parameters %d:%d\n",
 	line=1) at /usr/src/sys/kern/kern_mutex.c:791
     #10 0xffffffff8092eb69 in __mtx_unlock_flags (c=<value optimized out>,
 	opts=<value optimized out>,
 	file=0xffffffff81a25801 "%s: Can't handle disordered parameters %d:%d\n",
 	line=1) at /usr/src/sys/kern/kern_mutex.c:254
     #11 0xffffffff81a1b724 in smb_iod_thread (arg=0xfffff80002df0300)
 	at /usr/src/sys/modules/smbfs/../../netsmb/smb_iod.c:624
     #12 0xffffffff8091244a in fork_exit (
 	callout=0xffffffff81a1b670 <smb_iod_thread>, arg=0xfffff80002df0300,
 	frame=0xfffffe003d6c0c00) at /usr/src/sys/kern/kern_fork.c:1018
     #13 0xffffffff80d30d2e in fork_trampoline ()
 	at /usr/src/sys/amd64/amd64/exception.S:611
     #14 0x0000000000000000 in ?? ()
     Current language:  auto; currently minimal
     (kgdb)


Any tips on howto proceeed with this ?

I can setup a dedicated VM with a fresh install of whatever in case it helps.

Greetings
Christian

-- 
Christian Kratzer                   CK Software GmbH
Email:   ck at cksoft.de               Wildberger Weg 24/2
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