Hello everybody,

I have recently finished to upgrade my system to today morning's
-CURRENT, with sources just *before* the commit of rev 1.154 to
src/sys/kern/kern_fork.c by Julian.

I have an UP IA32 machine, I am not using any additional kernel modules,
and now, upon rebooting with the new kernel, as soon as I allow to
continue from the loader prompt, the kernel greets me with this:

(No serial console, transcribed by hand, please excuse any typos)

Fatal trap 12: page fault within kernel mode

fault virtual address   = 0xbff004c0
fault code              = supervisor read, protection violation
instruction pointer     = 0x8:0xc035c348
stack pointer           = 0x10:0xc0532c08
frame pointer           = 0x10:0xc0532c10
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         = 0 ()

kernel: type 12 trap, code=0
Stopped at 0xc035c348:      cmpl     $0,0xbfc00000(%eax)

Unfortunately, there is preciously little I could extract from ddb after

ddb> ps
pid  proc  addr  uid   ppid   pgrp  flag  stat  wmesg  wchan  cmd
0  c03f00c0 c0530000 0 0      0    000000 New 

ddb> tr
(null)(c0418920,c0800000,537000,c0532d48,c03595bd) at 0xc035c348
(null)(537000,0,c0532c9c,c0532ce8,10)  at 0xc035c290
(null)(537000,c0352524,f,0,8) at 0xc03595bd
(null)(537000) at 0xc0359fb9
(null)() at 0xc0130c7d

An attempt to "show locks" resulted in:

witness_list: witness_cold

Fatal trap 3 breakpoint instruction fault while in kernel mode

An attempt to "show witness" resulted in:

witness_display: witness_cold

Uptime 1s
and a complete lockup, only a power-cycle helped.

No dump was taken.

Does this ring a bell with anyone? I know that the trace may not help

I will be just too glad to offer any information or testing that may be


Szilveszter ADAM
Szombathely Hungary

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