https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254333
Bug ID: 254333
Summary: sysctl net.inet.tcp.hostcache.list hangs
Product: Base System
Version: 11.4-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: maxim.shalomik...@kaspersky.com
I'm running 'sysctl net.inet.tcp.hostcache.list' from operator's crontab every
5 minutes for gathering tcp statistics.
After 3 or 4 months of work sysctl hangs. Kill (and kill -9) doesn't help.
Running one more "sysctl net.inet.tcp.hostcache.list" command gives the same
result - it hangs forever with no output. Other "sysctl SOMETHING" commands
works fine.
# ps ax| grep sysctl
operator 787 0.0 0.0 4236 1004 - D Tue16 2:42.96
/sbin/sysctl net.inet.tcp.hostcache.list
operator 1908 0.0 0.0 4236 1004 - D Mon02 2:45.74
/sbin/sysctl net.inet.tcp.hostcache.list
operator 2358 0.0 0.0 4236 1004 - D Wed10 1:33.93
/sbin/sysctl net.inet.tcp.hostcache.list
operator 3270 0.0 0.0 4236 1004 - D Sun16 2:47.22
/sbin/sysctl net.inet.tcp.hostcache.list
After rebot 'sysctl net.inet.tcp.hostcache.list' works again as expected for
another 3 or 4 months.
The issue is reproducing on about 60 hevy loaded http(s) servers with different
hw specs.
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