DragonFly bugs List (threaded) for 2012-03
[DragonFlyBSD - Bug #2291] Panic in lwkt_remove_tdallq
Issue #2291 has been updated by Venkatesh Srinivas.
Also seen on 3.0.2 by tuxillo: http://leaf.dragonflybsd.org/~tuxillo/archive/pics/2291/panic1.png
And on -master by marino and vsrinivas. Callchain can be rooted at kern_exit instead of syncer.
Perhaps some blame goes to softdep's locks. It uses mplock + critical section around softdep callbacks.
Bug #2291: Panic in lwkt_remove_tdallq
Author: Rumko Rumko
With a few days old master and under some I/O load I get the mentioned panic (the actual panic message is illegable, only the trace can be read) ... was unable to get a core dump (panic in ddb didn't produce a dump, only rebooted the machine). The panic seems to be easily repeatable (unfortunately this is the first time I actually saw a trace, because I had DDB_UNATTENDED switched on before + was in X, so could not see the message)
Part of the backtrace (only the function names, I managed to take pictures of the backtrace itself, attached to this report):
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