amd64/145039: spin lock held too long amd64 mp_machdep.c

Ben Cadieux ben.cadieux at
Thu Mar 25 18:20:03 UTC 2010

>Number:         145039
>Category:       amd64
>Synopsis:       spin lock held too long amd64 mp_machdep.c
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-amd64
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 25 18:20:02 UTC 2010
>Originator:     Ben Cadieux
>Release:        FreeBSD 8.0-RELEASE & 8.0-STABLE
FreeBSD 8.0-STABLE FreeBSD 8.0-STABLE #0: Wed Mar 24 09:54:03 PDT 2010    sol at  amd64
I'm running 2 jails, and 2 VirtualBox sessions (with Win2k3 Server & WinXP).  If I only run 1 VirtualBox session, the problem seems to be rarer.

There doesn't seem to be too much of a pattern other than increased load increases the risk.  Sometimes the server is stable for a week, other times minutes or hours.

spin lock 0xffffffff80752f80 (smp rendezvous) held by 0xffffff0001879740 (tid 100022) too long
exclusive spin mutex smp rendezvous (smp rendezvous) r = 0 (0xffffffff80752f80)
locked @ /usr/src/sys/amd64/amd64/mp_machdep.c:992
panic: spin lock held too long
cpuid = 4
Uptime: 8m30s




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