Panic during shutdown

[Kostik Belousov]

On Wed, Jul 01, 2009 at 11:57:20AM -0500, Greg Rivers wrote:
> I'm running -CURRENT on an Acer One netbook.  Every kernel I've built 
> since last Sunday panics on shutdown (see below).  The panic occurs 
> whenever shutdown(8) is executed, even if only to drop to single-user. 
> halt(8) does not trigger the panic.
> 
> I have a core dump and kernel with debugging symbols available if needed.
...

> 
> #0  doadump () at pcpu.h:246
> 246	pcpu.h: No such file or directory.
> 	in pcpu.h
> (kgdb) #0  doadump () at pcpu.h:246
> #1  0xc04fe634 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:419
> #2  0xc04fe94b in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:575
> #3  0xc063262d in swap_release_by_uid (decr=Unhandled dwarf expression 
> opcode 0x93
> )
>     at /usr/src/sys/vm/swap_pager.c:267
> #4  0xc064a60b in vm_object_destroy (object=0xc4300000)
>     at /usr/src/sys/vm/vm_object.c:622
> #5  0xc064cb76 in vm_object_terminate (object=0xc4300000)
>     at /usr/src/sys/vm/vm_object.c:715
> #6  0xc064d24c in vm_object_deallocate (object=0xc4300000)
>     at /usr/src/sys/vm/vm_object.c:592
I am interested in the output of
p *object
from the frame 6, and the output of
p swap_total
p swap_reserved
all from kgdb.

Also, please describe the load on the machine, and look up what process
exited when the panic happens.

Thanks for the report.
> #7  0xc0644059 in _vm_map_unlock (map=0xc3d2f1d0, file=0x0, line=0)
>     at /usr/src/sys/vm/vm_map.c:480
> #8  0xc0644586 in vm_map_remove (map=0xc3d2f1d0, start=0, end=Variable 
> "end" is not available.
> )
>     at /usr/src/sys/vm/vm_map.c:2765
> #9  0xc0647548 in vmspace_exit (td=0xc417bd80) at 
> /usr/src/sys/vm/vm_map.c:329
> #10 0xc04d3c1c in exit1 (td=0xc417bd80, rv=0)
>     at /usr/src/sys/kern/kern_exit.c:299
> #11 0xc04d4c10 in sys_exit (td=Could not find the frame base for "sys_exit".
> ) at /usr/src/sys/kern/kern_exit.c:110
> #12 0xc068d2ee in syscall (frame=0xe649dd38)
>     at /usr/src/sys/i386/i386/trap.c:1073
> #13 0xc0672790 in Xint0x80_syscall ()
>     at /usr/src/sys/i386/i386/exception.s:261
> #14 0x00000033 in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> (kgdb)
> 
> [snip]
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