unbound crashed when running "unbound-control log_reopen"
Environment
- Red Hat Enterprise Linux (RHEL) 6
- unbound-1.4.20-23.el6.3
Issue
Command unbound
crashes when running unbound-control log_reopen
by logrotate
.
With following logrotate
config:
/var/log/unbound.log
{
daily
rotate 30
ifempty
missingok
compress
create 640 unbound unbound
sharedscripts
postrotate
/usr/sbin/unbound-control log_reopen
endscript
}
we see
Process /usr/sbin/unbound was killed by signal 11 (SIGSEGV)
in logs.
Resolution
Update to unbound-1.4.20-26.el6_10.1
shipped with Advisory RHBA-2019:0412 or newer.
Root Cause
Previously, rotating the unbound.log
file and executing the log_reopen
command in the unbound-control
utility led to a race condition in the logging subsystem of the unbound
resolver. Consequently, the unbound
service terminated unexpectedly. With this update, the race condition has been fixed, and the unbound
service no longer crashes in the described scenario.
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