panic with out of memory

[Konstantin Belousov]

On Tue, Jun 19, 2012 at 09:30:59PM -0400, Steve Wills wrote:
> Hi,
> 
> I just got a panic out of my r237195 system. The panic looks like:
> 
> Sleeping thread (tid 173153, pid 42034) owns a non-sleepable lock
> KDB: stack backtrace of thread 173153:
> sched_switch() at sched_switch+0x28a
> mi_switch() at mi_switch+0xdf
> sleepq_timedwait() at sleepq_timedwait+0x3a
> _sleep() at _sleep+0x266
> swp_pager_meta_build() at swp_pager_meta_build+0x259
> swap_pager_copy() at swap_pager_copy+0x17b
> vm_object_collapse() at vm_object_collapse+0x123
> vm_object_deallocate() at vm_object_deallocate+0x457
> vm_map_process_deferred() at vm_map_process_deferred+0x72
> vm_pageout_oom() at vm_pageout_oom+0x180
> swp_pager_meta_build() at swp_pager_meta_build+0x248
> swap_pager_copy() at swap_pager_copy+0x17b
> vm_object_collapse() at vm_object_collapse+0x123
> vm_object_deallocate() at vm_object_deallocate+0x457
> vm_map_process_deferred() at vm_map_process_deferred+0x72
> vm_map_remove() at vm_map_remove+0x116
> exec_new_vmspace() at exec_new_vmspace+0x1bc
> exec_elf64_imgact() at exec_elf64_imgact+0x5f4
> kern_execve() at kern_execve+0x6f0
> sys_execve() at sys_execve+0x37
> amd64_syscall() at amd64_syscall+0x351
> Xfast_syscall() at Xfast_syscall+0xfb
> --- syscall (59, FreeBSD ELF64, sys_execve), rip = 0x800d2eddc, rsp =
> 0x7fffffffd328, rbp = 0x7fffffffd470 ---
> panic: sleeping thread
> cpuid = 4
> 
> The system was very busy and using lots of swap, but I didn't expect a
> panic. If any more detail is needed or I should just get more RAM, let
> me know. :)

John has patches for this case.
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