Date: Sat, 26 Feb 2000 10:58:08 -0600 (CST) From: Steve Price <sprice@hiwaay.net> To: freebsd-alpha@freebsd.org Cc: phk@freebsd.org Subject: ps(1) coredumps on Alpha Message-ID: <Pine.OSF.4.21.0002261047010.25054-100000@fly.HiWAAY.net>
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Hi,
I've been having a problem with ps(1) coredump'ing on my Alpha box
for some time now and I think I've finally narrowed down the candidates.
With a fresh CVSup from last night the problem with ps(1) is still there.
However if I revert revision 1.24 of libkvm/kvm_proc.c it starts working
again.
RCS file: /home/ncvs/src/lib/libkvm/kvm_proc.c,v
Working file: kvm_proc.c
head: 1.25
...
----------------------------
revision 1.24
date: 1999/11/16 20:31:46; author: phk; state: Exp; lines: +48 -0
Introduce commandline caching in the kernel.
This fixes some nasty procfs problems for SMP, makes ps(1) run much faster,
and makes ps(1) even less dependent on /proc which will aid chroot and
jails alike.
To disable this facility and revert to previous behaviour:
sysctl -w kern.ps_arg_cache_limit=0
For full details see the current@FreeBSD.org mail-archives.
----------------------------
If I try to tweak the sysctl knob as the message suggests, here's what I get.
root@s2(/usr/src/bin/ps)# sysctl -w kern.ps_arg_cache_limit=256
kern.ps_arg_cache_limit: 512
sysctl: kern.ps_arg_cache_limit: Invalid argument
root@s2(/usr/src/bin/ps)# sysctl -w kern.ps_arg_cache_limit=0
kern.ps_arg_cache_limit: 512
sysctl: kern.ps_arg_cache_limit: Invalid argument
root@s2(/usr/src/bin/ps)#
Anyway, it seems the stack is being corrupted somehow by the new code
added to kvm_getargv(3) in revision 1.24. Anyone have any ideas? I'd
provide a stack trace from the ps(1) core file, but because the stack
is being corrupted after line 483 of ps.c it would be pretty worthless.
Thanks.
-steve
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