https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260126
Bug ID: 260126
Summary: syslog(3) spins the CPU with 4180 byte messages
Product: Base System
Version: 13.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
After commit 2886c93d1bca231260ebc01d4205743ca781f3c7 , it is possible for
syslog(3) to spin the CPU without making any progress, because send() returns
ENOBUFS for messages over about 4180 bytes. dtrace shows that allthough the
sockbuf size is set to 8192 bytes, it's sb_hiwat value is only 4096 at the time
of the bug. I don't yet know why.
The bug can be produced by installing rsyslogd from ports and running the
following command. I have not yet been able to reproduce it using syslogd.
daemon -f -s notice -l user jot -s "" -r -p 0 5000 0 9
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