Date: Tue, 7 Nov 2006 20:48:12 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: John Baldwin <jhb@freebsd.org> Cc: alc@freebsd.org, freebsd-current@freebsd.org, tegge@freebsd.org Subject: Re: VM deadlock? Message-ID: <20061107194812.GA25603@garage.freebsd.pl> In-Reply-To: <200611071324.23525.jhb@freebsd.org> References: <20061105152417.GM83118@garage.freebsd.pl> <200611071324.23525.jhb@freebsd.org>
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[-- Attachment #1 --] On Tue, Nov 07, 2006 at 01:24:22PM -0500, John Baldwin wrote: > On Sunday 05 November 2006 10:24, Pawel Jakub Dawidek wrote: > > db> sh allchain > > chain 1: > > thread 100260 (pid 90346, qmail-smtpd) blocked on lock 0xc07177e0 (sleep > mutex) "Giant" > > thread 100133 (pid 89997, qmail-smtpd) blocked on lock 0xc0722700 (sleep > mutex) "vm page queue mutex" > > thread 100105 (pid 4315, drwebd) is on a run queue > > chain 2: > > thread 100098 (pid 4316, qmail-smtpd) blocked on lock 0xc0722700 (sleep > mutex) "vm page queue mutex" > > thread 100105 (pid 4315, drwebd) is on a run queue > > chain 3: > > thread 100031 (pid 34, pagezero) blocked on lock 0xc0722700 (sleep > mutex) "vm page queue mutex" > > thread 100105 (pid 4315, drwebd) is on a run queue > > chain 4: > > thread 100015 (pid 3, g_up) blocked on lock 0xc0722700 (sleep mutex) "vm > page queue mutex" > > thread 100105 (pid 4315, drwebd) is on a run queue > > chain 5: > > thread 100002 (pid 14, swi4: clock sio) blocked on lock 0xc072146c (sleep > mutex) "tcp" > > thread 100000 (pid 16, swi1: net) blocked on lock 0xc0722700 (sleep > mutex) "vm page queue mutex" > > thread 100105 (pid 4315, drwebd) is on a run queue > > db> sh locktree > > db> sh turnstile > > > > Process drwebd (pid 4315) doesn't seem to go any further. > > How about 'show allpcpu' to see which threads are running? I get some feedback from tegge@ and kib@ is willing to investigate it further. This looks more like scheduler issue, not VM issue. There are 4 CPUs. 3 are idle, one is stuck running userland process at this point. Disabling PREEMPTION seemed to help. -- Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (FreeBSD) iD8DBQFFUOL8ForvXbEpPzQRApLdAJ9xa/gC3e+cF/GjAdR83HNh2jOH9QCgpQEM ye1lsaa2aTB4VK8JvPtnoig= =Prsq -----END PGP SIGNATURE-----help
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