Kernel panic after upgrade (lockmgr?)

David Wolfskill david at
Tue Mar 11 20:51:19 PDT 2008

On Tue, Mar 11, 2008 at 03:39:04PM -1000, Jeff Roberson wrote:
> I believe this is a cpuset/kse incompatibility.  Can you try this patch:

I was able to verify that if I tried to run firefox on my build machine,
it got a panic:

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 00
fault virtual address   = 0x4
fault code              = supervisor write, page not present
instruction pointer     = 0x20:0xc07400f7
stack pointer           = 0x28:0xe7b07b60
frame pointer           = 0x28:0xe7b07b7c
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         = 880 (firefox-bin)
[thread pid 880 tid 100122 ]
Stopped at      cpuset_rel+0x17:        lock xaddl      %eax,0x4(%esi)
db> bt
Tracing pid 880 tid 100122 td 0xc5ad9d20
cpuset_rel(0,c0af3c0d,f4,c50f6d20,e7b07bb4,...) at cpuset_rel+0x17
thread_free(c50f6d20,0,c0af5fd4,131,c5ad9d20,...) at thread_free+0x15
thread_reap(c0af1e43,e7b07be4,c0762cdc,c5ad9d20,e7b07be4,...) at thread_reap+0xc0
thread_alloc(ca,c5a96000,c5a96000,2,e7b07c80,...) at thread_alloc+0xc
thread_alloc_spare(c5a96090,0,c0af1e43,289,4,...) at thread_alloc_spare+0x21
kse_create(c5ad9d20,e7b07cfc,8,c0afaace,c0badfd8,...) at kse_create+0x1c2
syscall(e7b07d38) at syscall+0x2b3
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (381, FreeBSD ELF32, kse_create), eip = 0x28bd64db, esp = 0xbfbfcf0c, ebp = 0xbfbfcf48 ---

And it's obvious even to me that KSE was involved. :-}

I applied the cited patch & re-built the kernel; after rebooting
with the new kernel, I am unable to reproduce the panic: firefox
just runs normally.

I believe the patch is an improvement.  :-)

David H. Wolfskill				david at
I submit that "conspiracy" would be an appropriate collective noun for cats.

See for my public key.
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