rhel7/rhel8: Log loss occurred due to rsyslogd log rotation when writing to a pipe file
Issue
Log loss occurred due to rsyslogd log rotation when writing to a pipe file on RHEL7. If log rotation occurs in rsyslogd while writing to a pipe file, the following is outputted:
rsyslogd: write error on pipe /path/fifoname: Bad file descriptor
When rsyslogd receives SIGHUP, rsyslogd closes the pipe and then reopens it. If rsyslogd writes to the pipe between the pipe closes and the pipe opens, this issue occurs because there is no File Descriptor.
The rsyslog-v8 did not perform mutual exclusion between the pipe and SIGHUP processing threads, so when a conflict occurs, this message is outputted and the log is lost. Therefore, we determined that it was a rsyslog-v8 bug.
We have two questions as follows:
- Is Red Hat aware of the
rsyslogissue? - Does Red Hat have any plans to fix it?
Environment
- Red Hat Enterprise Linux (RHEL)
- RHEL7, minor version 7.4 and later affected
- RHEL8, minor versions 8.0-8.4 affected
rsyslog- RHEL7: versions from
8.24.0-12on and before8.24.0-57.el7_9.2affected - RHEL8: versions before
8.2102.0-5affected
- RHEL7: versions from
rsyslogd, with ompipe in uselogrotate, sending SIGHUP
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