On Tue, Aug 04, 2009 at 11:56:48AM +0200, Juergen Unger wrote: > On Tue, Aug 04, 2009 at 11:49:50AM +0200, Pawel Jakub Dawidek wrote: > > > testbox# sysctl debug.kdb.enter=1 > > > KDB: enter: sysctl debug.kdb.enter > > > [thread pid 11635 tid 100472 ] > > > Stopped at kdb_enter+0x3a: movl $0,kdb_why > > > db> show lock 0x87aac290 > > > class: sx > > > name: dp->dp_config_rwlock > > > state: XLOCK: 0x879e8480 (tid 100130, pid 172, "txg_thread_enter") > > > waiters: shared > > > db> > > > > Could you also try something like the following from DDB: > > > > x/bx 0x879ad8a0,52 > > db> x/bx 0x879ad8a0,52 > 0x879ad8a0: 82 1a 4b 87 0 0 71 2 0 0 0 0 0 0 0 0 > 0x879ad8b0: 1 0 0 0 91 1a 4b 87 4 0 0 0 40 92 cb 87 > 0x879ad8c0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0x879ad8d0: 0 0 0 0 9 1f 4b 87 0 0 71 2 0 0 0 0 > 0x879ad8e0: 0 0 0 0 40 92 cb 87 e8 0 0 0 c8 0 0 0 > 0x879ad8f0: a8 bb > db> This is dump of ZFS-specific rrwlock that some threads are waiting for. We can see here that thread owning the lock is 0x87cb9240, which is pid 86397 (zfs recv process). I don't think we will be able to gather more info from here. I'm builing HEAD at the moment and hopefully will be able to reproduce it. Thanks for all the info. -- Pawel Jakub Dawidek http://www.wheel.pl pjd_at_FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am!
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