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[Bug runtime/10854] New: Race between script startup and abnormal shutdown
- From: "jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 27 Oct 2009 18:15:04 -0000
- Subject: [Bug runtime/10854] New: Race between script startup and abnormal shutdown
- Reply-to: sourceware-bugzilla at sourceware dot org
We have a race condition where the shutdown code may be called while the startup
is still in progress. Since the shutdown thinks the probes aren't started, we
end up leaving some kernel callbacks registered after the module has unloaded,
which will crash the system.
See also https://bugzilla.redhat.com/show_bug.cgi?id=521610
Using para-callgraph2.stp from that bug, the problem can be reproduced with this
loop:
MOD=$(stap -v para-callgraph2.stp sys_read '*@fs/*.c' -p4) && \
while true; do
staprun $MOD -v -o /dev/null &
while ! pkill -INT stapio; do true; done
wait
done
That will repeatedly run the script in the background and kill it as soon as
possible. I find that it usually triggers the race in only a few iterations.
--
Summary: Race between script startup and abnormal shutdown
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: jistone at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=10854
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