https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291557
Bug ID: 291557
Summary: syslogd immediately kills process started with pipe
Product: Base System
Version: 15.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Starting from 15.0-RELEASE, syslogd immediately kills process started with pipe
instead of close the pipe and wait for the process exit.
Steps to reproduce:
1. Create script named pipe-test:
--------------------------------------------------
#!/bin/sh
logger -p local3.warning -t pipe-test "$$ START"
while read msg; do
logger -p local3.warning -t pipe-test "$$ ${msg}"
done
logger -p local3.warning -t pipe-test "$$ END"
exit 0
--------------------------------------------------
2. Add it to configuration of syslogd:
local2.* |exec /home/user/pipe-test
3. Apply new config:
killall -1 syslogd
4. Send message to syslog:
logger -p local2.warning -t logger message1
5. Reread syslogd config to restart pipe-test script:
killall -1 syslogd
6. Send message to syslog again:
logger -p local2.warning -t logger message2
As a result, we got in /var/log/messages:
Dec 10 20:37:24 host logger[77378]: message1
Dec 10 20:37:24 host pipe-test[77383]: 77379 START
Dec 10 20:37:24 host pipe-test[77387]: 77379 Dec 10 20:37:24 host
logger[77378]: message1
Dec 10 20:37:29 host logger[77400]: message2
Dec 10 20:37:29 host pipe-test[77405]: 77401 START
Dec 10 20:37:29 host pipe-test[77409]: 77401 Dec 10 20:37:29 host
logger[77400]: message2
pipe-test script never prints "END" and never reaches exit.
The problem is caused by this commit:
commit d2d180fb77362eb1381ada9edefe4332be776bf2
Author: Jake Freeland <[email protected]>
Date: Wed Nov 27 16:26:02 2024 -0600
syslogd: Watch for dead pipe processes
For each new pipe process, add its process descriptor into the kqueue
with the EVFILT_PROCDESC filter and NOTE_EXIT event. When the pipe
process exits, the main kqueue loop will catch this, logging exit errors
and cleaning up the pipe process' filed node.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D41477
Applying reverse patch and rebuilding syslogd fixes the issue.
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