On Sunday, March 09, 2014 9:39:36 pm Glen Barber wrote:
I think I have hit a panic in the code path for vt_switch_timer() when
resuming from suspend.
In both cases it happened, the laptop was suspended for 2 hours.
In both cases, c_func is vt_switch_timer(), and c_arg is a negative
value (both times it is -2133611368). I am not sure if these are valid
values for vt_switch_timer(), but it caught my eye.
The amount of time the laptop has been suspended may be unrelated, but
so far has been the only constant in numerous attempts to reproduce the
crash.
The machine is running 11.0-CURRENT #202 r262562, and the only recent
change to the kernel configuration is switching from sc(4) to vt(4)
a few weeks ago. Prior to this, I could leave the machine suspended for
several hours (sometimes up to 4 when traveling), without issue.
Script started on Sun Mar 9 20:22:44 2014
command: /bin/sh
# kgdb ./kernel.debug /var/crash/vmcore.last
GNU gdb 6.1.1 [FreeBSD]
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welcome to change it and/or distribute copies of it under certain conditions.
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This GDB was configured as amd64-marcel-freebsd...
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x30
fault code = supervisor read data, page not present
instruction pointer = 0x20:0x8064378f
stack pointer = 0x28:0xfe01e47b98f0
frame pointer = 0x28:0xfe01e47b99b0
code segment= base 0x0, limit 0xf, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags= interrupt enabled, resume, IOPL = 0
current process = 12 (swi4: clock (0))
trap number = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0x8066c280 at kdb_backtrace+0x60
#1 0x8062bc65 at panic+0x155
#2 0x8095a78f at trap_fatal+0x38f
#3 0x8095aac1 at trap_pfault+0x321
#4 0x8095a160 at trap+0x4a0
#5 0x8093f682 at calltrap+0x8
#6 0x80643b94 at softclock+0x94
#7 0x805f6aa8 at intr_event_execute_handlers+0x1b8
#8 0x805f6ea6 at ithread_loop+0x96
#9 0x805f3c9a at fork_exit+0x9a
#10 0x8093fbbe at fork_trampoline+0xe
Uptime: 6h12m9s
Dumping 3121 out of 7951 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%
Reading symbols from /boot/kernel/zfs.ko.symbols...done.
Loaded symbols for /boot/kernel/zfs.ko.symbols
Reading symbols from /boot/kernel/opensolaris.ko.symbols...done.
Loaded symbols for /boot/kernel/opensolaris.ko.symbols
Reading symbols from /boot/kernel/i915kms.ko.symbols...done.
Loaded symbols for /boot/kernel/i915kms.ko.symbols
Reading symbols from /boot/kernel/drm2.ko.symbols...done.
Loaded symbols for /boot/kernel/drm2.ko.symbols
#0 doadump (textdump=value optimized out) at pcpu.h:219
219 __asm(movq %%gs:%1,%0 : =r (td)
(kgdb) bt
#0 doadump (textdump=value optimized out) at pcpu.h:219
#1 0x8062b808 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:452
#2 0x8062bca4 in panic (fmt=value optimized out)
at /usr/src/sys/kern/kern_shutdown.c:759
#3 0x8095a78f in trap_fatal (frame=value optimized out, eva=value
optimized out)
at /usr/src/sys/amd64/amd64/trap.c:874
#4 0x8095aac1 in trap_pfault (frame=0xfe01e47b9840,
usermode=value optimized out) at /usr/src/sys/amd64/amd64/trap.c:691
#5 0x8095a160 in trap (frame=0xfe01e47b9840)
at /usr/src/sys/amd64/amd64/trap.c:455
#6 0x8093f682 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:231
#7 0x8064378f in softclock_call_cc (c=0x80d3ae78,
cc=0x80eace80,
direct=0) at /usr/src/sys/kern/kern_timeout.c:703
#8 0x80643b94 in softclock (arg=0x80eace80)
at /usr/src/sys/kern/kern_timeout.c:812
#9 0x805f6aa8 in intr_event_execute_handlers (p=value optimized
out,
ie=0xf800031f3a00) at /usr/src/sys/kern/kern_intr.c:1263
#10 0x805f6ea6 in ithread_loop (arg=0xf8000323cf80)
at /usr/src/sys/kern/kern_intr.c:1276
#11 0x805f3c9a in fork_exit (callout=0x805f6e10
ithread_loop,
arg=0xf8000323cf80, frame=0xfe01e47b9ac0) at
/usr/src/sys/kern/kern_fork.c:977
#12 0x8093fbbe in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:605
#13 0x in ?? ()
Current language: auto; currently minimal
(kgdb) frame 7
#7 0x8064378f in softclock_call_cc (c=0x80d3ae78,
cc=0x80eace80,
direct=0) at /usr/src/sys/kern/kern_timeout.c:703
703
