7.0 Crashing

[Kostik Belousov]

On Sun, Jul 27, 2008 at 04:25:15PM -0400, Michael toth wrote:
> Fatal trap 12: page fault while in kernel mode
> cpuid = 4; apic id = 04
> fault virtual address   = 0x188
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc0775284
> stack pointer           = 0x28:0xe7d6bad0
> frame pointer           = 0x28:0xe7d6bae8
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                        = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 4838 (egrep)
> trap number             = 12
> panic: page fault
> cpuid = 4
> Uptime: 1h2m48s
> Physical memory: 2035 MB
> Dumping 87 MB: 72 56 40 24 8
> 
> Reading symbols from /boot/kernel/acpi.ko...Reading symbols from 
> /boot/kernel/acpi.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/acpi.ko
> #0  doadump () at pcpu.h:195
> 195             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
> (kgdb) backtrace
> #0  doadump () at pcpu.h:195
> #1  0xc0782597 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
> #2  0xc0782859 in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:572
> #3  0xc0a8b39c in trap_fatal (frame=0xe7d6ba90, eva=392) at 
> /usr/src/sys/i386/i386/trap.c:899
> #4  0xc0a8b620 in trap_pfault (frame=0xe7d6ba90, usermode=0, eva=392) at 
> /usr/src/sys/i386/i386/trap.c:812
> #5  0xc0a8bfcc in trap (frame=0xe7d6ba90) at 
> /usr/src/sys/i386/i386/trap.c:490
> #6  0xc0a71bdb in calltrap () at /usr/src/sys/i386/i386/exception.s:139
> #7  0xc0775284 in _mtx_lock_sleep (m=0xc600d174, tid=3318745216, opts=0, 
> file=0x0, line=0) at /usr/src/sys/kern/kern_mutex.c:339
> #8  0xc09a93d7 in vm_fault (map=0xc56b5570, vaddr=671809536, 
> fault_type=2 '\002', fault_flags=8) at /usr/src/sys/vm/vm_fault.c:293
> #9  0xc0a8b50b in trap_pfault (frame=0xe7d6bd38, usermode=1, 
> eva=671813488) at /usr/src/sys/i386/i386/trap.c:789
> #10 0xc0a8be57 in trap (frame=0xe7d6bd38) at 
> /usr/src/sys/i386/i386/trap.c:357
> #11 0xc0a71bdb in calltrap () at /usr/src/sys/i386/i386/exception.s:139
> #12 0x2806e607 in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> (kgdb) up
> #1  0xc0782597 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
> 418                     doadump();
> (kgdb) up
> #2  0xc0782859 in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:572
> 572             boot(bootopt);
> (kgdb) up
> #3  0xc0a8b39c in trap_fatal (frame=0xe7d6ba90, eva=392) at 
> /usr/src/sys/i386/i386/trap.c:899
> 899                     panic("%s", trap_msg[type]);
> (kgdb) up
> #4  0xc0a8b620 in trap_pfault (frame=0xe7d6ba90, usermode=0, eva=392) at 
> /usr/src/sys/i386/i386/trap.c:812
> 812                     trap_fatal(frame, eva);
> (kgdb) up
> #5  0xc0a8bfcc in trap (frame=0xe7d6ba90) at 
> /usr/src/sys/i386/i386/trap.c:490
> 490                             (void) trap_pfault(frame, FALSE, eva);
> (kgdb) up
> #6  0xc0a71bdb in calltrap () at /usr/src/sys/i386/i386/exception.s:139
> 139             call    trap
> Current language:  auto; currently asm
> (kgdb) up
> #7  0xc0775284 in _mtx_lock_sleep (m=0xc600d174, tid=3318745216, opts=0, 
> file=0x0, line=0) at /usr/src/sys/kern/kern_mutex.c:339
> 339                             owner = (struct thread *)(v & 
> ~MTX_FLAGMASK);
> Current language:  auto; currently c
> (kgdb) up
> #8  0xc09a93d7 in vm_fault (map=0xc56b5570, vaddr=671809536, 
> fault_type=2 '\002', fault_flags=8) at /usr/src/sys/vm/vm_fault.c:293
> 293             VM_OBJECT_LOCK(fs.first_object);
> (kgdb) p fs
> $1 = {m = 0x0, object = 0x12, pindex = 13878757899709627520, first_m = 
> 0xc5f0a8b8, first_object = 0xc600d174, first_pindex = 0, map = 
> 0xc56b5570, entry = 0xc59fc7f8, lookup_still_valid = 2, vp = 0xc55c5220}
> (kgdb) p fs.first_object
> $2 = 0xc600d174
> (kgdb)

Please, show the output of
	p/x *(fs.first_object)

BTW, you have said that you got a lot of the panics. Are backtraces
the same for all of them ?
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