Re: vm-related panic with 5.1RC1

On Sun, 1 Jun 2003 11:26:12 +0200 (CEST)
Martin Blapp <mb_at_imp.ch> wrote:

> 
> Hi all,
> 
> I just got this panic during compile of openoffice
> 
> Fatal trap 12 while in kernel mode
> fault virtual address = 0x68
> fault code            = supervisor read, page not present
> instruction pointer   = 0x8:0xc0271f4d
> stack pointer         = 0x10:0xe6e51ab0
> frame pointer         = 0x10:0xe6e51ae0
> code segement         = base 0x0, limit 0xfffff, type 0x1b
>                       = DPL 0, pres 1, def32, gran 1
> processor flags       = interrupt enabled, resume, IOPL =1
> current process       = 22362
> kernel: type 12 trap, code=0
> Stopped at _mtx_lock_sleep+0x16d: movl 0x68(%ecx),%edx
> db> trace
> _mtx_lock_sleep(c082f0b0,0,0,0,c0678415) at _mtx_lock_sleep+0x16d
> vm_map_delete(c082f000, d0d0d000, d0d11000, e6effda0, c78d5720) at
> vm_map_delete+0x383) vm_map_remove(c082f000, d0d0d000, d0d11000,
> e6e51b9c, c03b247f) at vm_map_remove+0x58) kmem_free(c082f000,
> d0d0d000, 3000, 0, 80) at kmem_free+0x32 cpu_thread_clean(c78d54c0,
> e6e51bb4,c78d54c0, c78d54c0, e6e51be4) at cpu_thread_clean+0x7f
> thread_free(c78d54c0, e6e51bd0, c0275839, c67a3000, c6abf030) at
> thread_free+0x14 thread_reap(c78d55f0) at thread_reap+0x16c
> thread_wait(c656b000, ffffffff, 0, c03feb34,0) at thread_wait+0x55
> wait1(c6569980, e6e51d10,  0, e6e51d40, c03b0dfa) at wait1+0x738
> wait5(c6569980, e6e51d10, 10, c6569980, 4) at wait4+0x20
> syscall(2f, 2f, 2f, bfbff074, 325) at syscall+0x2aa
> Xint0x80_syscall() at Xint0x80_syscall()+0x1d
> --- syscall (7, FreeBSD ELF32, wait4) eip = 0x807b28b, esp =
> 0xbfbfefbc, ebp = 0xbfbfefd8)
> 
> Unfortunatly my partition was too small, so I could not get a dump.
> I've adjusted this now and the next time it panics I'll have one
> ready.
> 
> Martin

This is exactly the panic I am seeing on my dual-processor box. My
current suspicion is that it somehow relates to the same pcb_ext being
freed twice. I do not need OpenOffice to trigger the bug, on SMP
configuration it happens all the time.