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I re-ran testing with an 'options DEBUG' kernel, and kmem_guard_depth was set to 20k pages. ATF failed again in the same manner, but none of the DEBUG tools triggered, not even KMEM_GUARD. Not sure how else to debug this...

FWIW, here's the traceback from the current failure:

lib/libc/gen/posix_spawn/t_fileactions (193/499): 5 test cases
    t_spawn_empty_fileactions: [0.573848s] Passed.
    t_spawn_fileactions: [0.154962s] Passed.
    t_spawn_open_nonexistent: fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff8061128e cs 8 rflags 246 cr2 0 cpl 8 rsp fffffe8002c75ae0
panic: trap
cpu0: Begin traceback...
printf_nolog() at netbsd:printf_nolog
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0xa2
mi_switch() at netbsd:mi_switch+0x2c5
kpreempt() at netbsd:kpreempt+0xe2
Xpreemptrecurse() at netbsd:Xpreemptrecurse+0x15
spawn_return() at netbsd:spawn_return+0x1f8
cpu0: End traceback...

On Wed, 7 Mar 2012, Mindaugas Rasiukevicius wrote:

Paul Goyette <> wrote:
Debugging such memory corruptions is difficult.  Can you try running
with KMGUARD enabled?  See the bottom of kmem(9) man page how to enable

One might need to try different depth levels as the system can run out
of memory very quickly.  This requires 64-bit machine, e.g. amd64 (i386
would run out of KVA) with lots of RAM.

I will see what I can do here.  The qemu test environment runs with
fairly limited memory (only 128M) so I suspect that will need to be
(drastically?) increased?  (My host has 32GB of real RAM but not sure
how much qemu can support.)

Are you able to try to reproduce on a real hardware?  Resource usage by
KMGUARD is very severe.  It might not even boot with 128 MB.



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