10-STABLE live locks, looks like VM-related

Lev Serebryakov lev at FreeBSD.org
Mon Apr 6 08:55:27 UTC 2015


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 I got several live locks of my server in a row (3 in one week).
 It is amd64 10-STABLE r277307.
 Looks like live locks is VM related but manifest themselves under
multi-threaded mixed CPU + I/O load (CrashPlan backup + torrents +
openjdk8 rebuild, for example).

 This system doesn't have ZFS, but have several UFS2 SU+J with
different block sizes (16Kb and 32Kb)! As far as I remeber several
versions ago "16Kb + 64Kb" mix was a killer (known bug). but "16 + 32"
works well for several years.

 I have INVARIANTS and WITNESS in the kernel, but it doesn't help:
only report is "bufwait/dirhash" right after booting.

 When system hangs, I could ping it, but NFS, SMB, ssh, local console,
everything else userland-related stop to answer.

 I could break into kernel debugger on console and "panic" manually,
so I have two "crash dumps" of system in this state.

 Many processes are in "vmwait" or "pfault" state according to DDB's
"ps" output.

 here are logs from two latest crashes:

 http://lev.serebryakov.spb.ru/freebsd/ll/

 I've tested memory with memtest86 for 12 hours without errors.

- -- 
// Lev Serebryakov AKA Black Lion
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