Date: Wed, 10 Dec 2025 18:40:22 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 291557] syslogd immediately kills process started with pipe Message-ID: <bug-291557-227@https.bugs.freebsd.org/bugzilla/>
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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: bugs@FreeBSD.org Reporter: work+freebsd@vvv.kiev.ua 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 <jfree@FreeBSD.org> 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. -- You are receiving this mail because: You are the assignee for the bug.home | help
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