Date: Sun, 11 Dec 2005 21:02:27 -0800 (PST) From: Eric Anholt <anholt@leguin.anholt.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/90269: panic in pmc sampling mode Message-ID: <200512120502.jBC52RUp001398@leguin.anholt.net> Resent-Message-ID: <200512120510.jBC5A2wX039660@freefall.freebsd.org>
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>Number: 90269 >Category: kern >Synopsis: panic in pmc sampling mode >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Dec 12 05:10:02 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Eric Anholt >Release: FreeBSD 7.0-CURRENT amd64 >Organization: >Environment: System: FreeBSD leguin.anholt.net 7.0-CURRENT FreeBSD 7.0-CURRENT #22: Thu Dec 1 01:48:14 PST 2005 anholt@leguin.anholt.net:/usr/obj/usr/src/current/sys/MYKERNEL amd64 >Description: Attempting to use pmc to profile a library I'm working on results in panics. While I couldn't get a dump, here's the backtrace: kdb_enter() at kdb_enter+0x2f panic() at panic+0x249 pmc_release_pmc_descriptor() at pmc_release_pmc_descriptor+0x2eb pmc_syscall_handler() at pmc_syscall_handler+0x41a syscall() at syscall+0x217 Xfast_syscall() at Xfast_syscall+0xa8 I didn't get the panic str, it looks like. Started my minicom log too late. I'll get that later by reproducing, but wanted to get the bug filed for now. >How-To-Repeat: Install liboil from ports Download and build libpcg from my website: http://www.anholt.net/libpcg/release/libpcg-0.2.1.tar.bz2 Try to run a shell script containing: pmcstat -S instructions -O samples.out ./tests/timing pmcstat -R samples.out -g Watch your serial console. It'll run for a couple of seconds, but then die (perhaps around the time that the program should be ending). I suspect the actual list of steps is not so specific, but it's what I'm using (modulo that I'm using current libpcg sources that I'm working on making faster :) >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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