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From: searle@longacre.demon.co.uk (Michael Searle)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Signal 11
Date: Fri, 24 May 1996 14:38:57 BST
Lines: 51
Message-ID: <nD356D43A@longacre.demon.co.uk>
NNTP-Posting-Host: longacre.demon.co.uk
X-NNTP-Posting-Host: longacre.demon.co.uk
X-Newsreader: Offlite 0.09 / Termite Internet for Acorn RISC OS
Does processes exiting on signal 11 always mean bad hardware (probably
memory or mainboard), or can they be caused by other things (like buggy
executables)? I have had them occasionally, but mostly on new software I
hadn't tried before. I have never had gcc failing (and I have done several
kernel compiles), and probably no panics. I say probably because a few times
X has frozen and the only way out has been a reset - C-A-Backspace and
C-A-Delete do nothing. I think this is something grabbing the server and not
returning it - once was when I ran out of swap, if something was killed
while grabbing the server, maybe that could cause it. Would a panic always
dump core and reboot instead of hanging up?
I have one repeatable problem with these, can someone tell me whether it is
a bug or my PC. I am using XFree86 3.1.2, running fvwm and a few utilities
(xperfmon++, xdaliclock, that sort of thing), all packages. I got a small
xterm and got a large man page (in this case that for X.) I then moved it to
the bottom of the (hardware virtual) screen and resized it vertically to the
top of the (hardware virtual) screen. This usually caused this error:
Memory fault (-core dumped) (more.core)
Error executing formatting or display command
system command exited with status 35584
No manual entry for X
more : exited on signal 11
I also got signal 11s running (package) sox (which usually works) and olvwm
(which doesn't, although I didn't try very hard to make it work)
My system is an ASUS-PCI/I-P55TP4N (Triton) with P166, 256K 8ns Pipeline
Burst SRAM, and 16M 60ns RAM.
Also - I did a lmbench, mostly seemed OK but
*Local* Communications bandwidths in megabytes/second
-----------------------------------------------------
Host OS Pipe TCP File Mmap Bcopy Bcopy Mem Mem
reread reread (libc) (hand) read write
longacre FreeBSD 2.1.0 23 0.2 4.1 55.8 0 0 73 83
TCP and file reread speed are both way below any others (most examples got
10+ TCP and 20+ file reread. A Linux P90 was second slowest with 2.4 TCP and
9.8 file reread.) Bcopy may just not have been done - I skipped the raw
device test (first question). So what does that mean, if anything? If the
file reread speeds are just testing disk read speed, it sounds like the
others are reading disk cache and I am reading the actual disk, which does
3.2M/s read. (Also I got 6ns L1 cache, 117ns L2 cache, 184ns main memory.
Should the L2 cache really be that slow?)
--
Michael Searle - searle@longacre.demon.co.uk