Date: Fri, 12 Aug 2005 20:52:33 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Kris Kennaway <kris@obsecurity.org> Cc: phk@FreeBSD.org, current@FreeBSD.org Subject: Re: Infinite loop in devfs_create() Message-ID: <20050813005233.GA48108@xor.obsecurity.org> In-Reply-To: <20050813004326.GA47855@xor.obsecurity.org> References: <20050813004326.GA47855@xor.obsecurity.org>
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[-- Attachment #1 --] On Fri, Aug 12, 2005 at 08:43:26PM -0400, Kris Kennaway wrote: > I have an SMP amd64 package machine that has deadlocked, apparently > here: > > --- trap 0x13, rip = 0xffffffff8034b2a1, rsp = 0xffffffffbe6f2a10, rbp = 0xffffffffbe6f2a40 --- > devfs_create() at devfs_create+0x41 > make_dev_credv() at make_dev_credv+0x148 > make_dev() at make_dev+0x97 > g_dev_taste() at g_dev_taste+0x130 > g_new_provider_event() at g_new_provider_event+0x8a > one_event() at one_event+0x19b > g_run_events() at g_run_events+0x9 > g_event_procbody() at g_event_procbody+0x7d > fork_exit() at fork_exit+0xdf > fork_trampoline() at fork_trampoline+0xe > --- trap 0, rip = 0, rsp = 0xffffffffbe6f2d00, rbp = 0 --- > > If I break/continue and examine devfs_nextino, it appears to be > looping infinitely in devfs_create: > > db> x/d devfs_nextino > devfs_nextino: 746 > [...] > db> x/d devfs_nextino > devfs_nextino: 339 > > This machine has a number of md mounts active (they are created and > destroyed dynamically and tend to get up to high unit numbers, around > ~600 at the time of deadlock). Also devfs mounts come and go, but I > don't think anything else unusual is going on on the system. This could explain some mysterious deadlocks I've been getting on sparc machines too, which also cycle through md devices in a similar way. I bet something is not being cleaned up properly when the devices are unconfigured, and eventually devfs is filling up all available inodes (1024) and failing gracelessly. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFC/URRWry0BWjoQKURAp1GAJ460n8rAI9XD21lkKF0BDQXYPlLxQCg39Pt ZUSQSPmSqEAF7ffzt34ZrvE= =xoLh -----END PGP SIGNATURE-----
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