7.1 stable panics

[Nathanael Jean-Francois]

Hello all,

I've been getting some panics with a 7.1 stable machine from March 14th.
I've not been able to determine the cause nor reproduce them at will.
Here's a backtrace from the latest panic on March 23rd. Let me know if any
more information is needed. Thanks.

Unread portion of the kernel message buffer:
panic: lock (sleep mutex) Giant not locked @
/usr/src/sys/kern/kern_ntptime.c:965
cpuid = 1
Uptime: 1d15h34m6s
Physical memory: 2034 MB
Dumping 377 MB: 362 346 330 314 298 282 266 250 234 218 202 186 170 154
138 122 106 90 74 58 42em0: watchdog timeout -- resetting
<5>em0: link state changed to DOWN
 26 10

#0  doadump () at pcpu.h:195
195             __asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb) list
190     static __inline struct thread *
191     __curthread(void)
192     {
193             struct thread *td;
194
195             __asm __volatile("movq %%gs:0,%0" : "=r" (td));
196             return (td);
197     }
198     #define curthread               (__curthread())
199
(kgdb) backtrace
#0  doadump () at pcpu.h:195
#1  0x0000000000000104 in ?? ()
#2  0xffffffff804e6fc2 in boot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:418
#3  0xffffffff804e73f2 in panic (fmt=0x104 <Address 0x104 out of bounds>)
at /usr/src/sys/kern/kern_shutdown.c:574
#4  0xffffffff805218b6 in witness_unlock (lock=0xffffffff80b0a400,
flags=8, file=0x0, line=965) at /usr/src/sys/kern/subr_witness.c:1284
#5  0xffffffff804dadb2 in _mtx_unlock_flags (m=0xffffffff80b0a400, opts=0,
file=0xffffffff8087a008 "/usr/src/sys/kern/kern_ntptime.c", line=965)
    at /usr/src/sys/kern/kern_mutex.c:203
#6  0xffffffff804dc062 in kern_adjtime (td=0xffffffff80884bd0,
delta=0x674, olddelta=Variable "olddelta" is not available.
) at /usr/src/sys/kern/kern_ntptime.c:965
#7  0xffffff00019cf870 in ?? ()
#8  0x00000000000005a8 in ?? ()
#9  0xffffffff805430b6 in soreceive_generic (so=0xffffff0078a9f600,
psa=0x0, uio=0xfffffffebe695b10, mp0=Variable "mp0" is not available.
) at /usr/src/sys/kern/uipc_socket.c:1652
#10 0xffffffff80523e6d in dofileread (td=0xffffff000181b000, fd=3,
fp=0xffffff00016af200, auio=0xfffffffebe695b10, offset=Variable "offset"
is not available.
) at file.h:245
#11 0xffffffff805241de in kern_readv (td=0xffffff000181b000, fd=3,
auio=0xfffffffebe695b10) at /usr/src/sys/kern/sys_generic.c:192
#12 0xffffffff805242cc in read (td=0x0, uap=0x0) at
/usr/src/sys/kern/sys_generic.c:108
#13 0xffffffff8079d0dc in syscall (frame=0xfffffffebe695c80) at
/usr/src/sys/amd64/amd64/trap.c:907
#14 0xffffffff80781cbb in Xfast_syscall () at
/usr/src/sys/amd64/amd64/exception.S:330
#15 0x000000080076ad7c in ?? ()
Previous frame inner to this frame (corrupt stack?)