[DragonFlyBSD - Bug #2291] Panic in lwkt_remove_tdallq

[Venkatesh Srinivas via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2291 has been updated by Venkatesh Srinivas.


http://leaf.dragonflybsd.org/~marino/install_panic_1.jpg is marino's panic.

All of these panics are actually: 'td_critcount would go negative', from crit_panic. This appears to come from FREE_LOCK(), which exits a critical section "softupdates"; if one were to exit a critical section one more time than they entered it, that would cause this panic. 


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Bug #2291: Panic in lwkt_remove_tdallq
http://bugs.dragonflybsd.org/issues/2291

Author: Rumko Rumko
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


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):
panic()
lwkt_remove_tdallq()
free_lock()
acquire_lock()
softdep_disk_io_initiation()
devfs_spec_strategy()
vop_strategy()
vn_strategy()
ufs_strategy()
ufs_vnoperate()
vop_strategy()
vn_strategy()
bawrite()
...
syncer_thread()
syncer_thread_start()
kthread_exit()


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