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port-powerpc/46591: Doing "ktrace -p <pid>" triggered panic
>Synopsis: Doing "ktrace -p <pid>" triggered panic
>Arrival-Date: Tue Jun 12 09:00:00 +0000 2012
>Originator: Havard Eidnes
>Release: NetBSD 6.0_BETA2
System: NetBSD malus.urc.uninett.no 6.0_BETA2 NetBSD 6.0_BETA2 (GENERIC) #5:
Wed May 30 20:32:20 CEST 2012
During a pkgsrc bulk build, an awk process appeared to be
spinning on the CPU checking for "porbability" of a Bourne
shell script. I wanted to see if it was doing any system
calls, and what they were, so did a
ktrace -p <pid>
on the process, something which triggered an instant panic.
This was what was left in the messages file after the machine
came back up again:
panic: cpu_uarea_alloc: uvm_pglistalloc failed: 12
cpu0: Begin traceback...
0xd9d5bc40: at panic+0x4c
0xd9d5bc80: at cpu_uarea_alloc+0x78
0xd9d5bcb0: at uarea_system_poolpage_alloc+0x20
0xd9d5bcc0: at pool_grow+0x48
0xd9d5bce0: at pool_get+0x58
0xd9d5bd00: at pool_cache_get_slow+0x1a4
0xd9d5bd50: at pool_cache_get_paddr+0x104
0xd9d5bd90: at uvm_uarea_system_alloc+0x1c
0xd9d5bda0: at kthread_create+0x60
0xd9d5be00: at ktrace_common+0x390
0xd9d5be40: at sys_ktrace+0xf4
0xd9d5bec0: at syscall_plain+0x1f0
0xd9d5bf20: user SC trap #45 by 0xfde8120c: srr1=0xd032
r1=0xffffd760 cr=0x28000044 xer=0x20000000 ctr=0xfde81204
cpu0: End traceback...
Since there doesn't appear to be any code to dump kernel core,
that's all I'm left with.
12 is ENOMEM.
...and since uarea_system_poolpage_alloc() calls
cpu_uarea_alloc with "true", it panics. It appears that
uarea_system_poolpage_alloc() is prepared to deal with a NULL
return from cpu_uarea_alloc(), though, but on powerpc, it
appears that cpu_uarea_alloc() will never return NULL, but
will instead panic if called with system=true and there's a
memory shortage "somewhere".
This is different from x86, where the code doesn't check the
"system" argument, and doesn't panic() inside
I'm not sure how repeatable this is...
Sorry, don't know.
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