Date: Sun, 24 Mar 2002 14:26:32 -0800 From: Kris Kennaway <kris@obsecurity.org> To: alfred@FreeBSD.org, current@FreeBSD.org Subject: Lock order reversals in sys_pipe.c Message-ID: <20020324142632.A60767@xor.obsecurity.org>
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[-- Attachment #1 --] The bento cluster is now running with WITNESS enabled to try and track down some odd UMA lock corruption panics. Instead, it found the following lock order reversal in sys_pipe.c overnight: Mar 24 07:31:44 <user.crit> gohan17 kernel: lock order reversal Mar 24 07:31:44 <user.crit> gohan17 kernel: 1st 0xcf51aa80 pipe mutex @ /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 07:31:44 <user.crit> gohan17 kernel: 2nd 0xcf88dadc process lock @ /local0/scratch/usr/src/sys/kern/kern_sig.c:2093 Mar 24 07:32:12 <user.crit> gohan10 kernel: lock order reversal Mar 24 07:32:12 <user.crit> gohan10 kernel: 1st 0xd9a29dc0 pipe mutex @ /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 07:32:12 <user.crit> gohan10 kernel: 2nd 0xd961addc process lock @ /local0/scratch/usr/src/sys/kern/kern_sig.c:2093 Mar 24 07:32:57 <user.crit> gohan12 kernel: lock order reversal Mar 24 07:32:57 <user.crit> gohan12 kernel: 1st 0xd9423080 pipe mutex @ /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 07:32:57 <user.crit> gohan12 kernel: 2nd 0xdaa704dc process lock @ /local0/scratch/usr/src/sys/kern/kern_sig.c:2093 Mar 24 09:02:29 <user.crit> gohan13 kernel: lock order reversal Mar 24 09:02:29 <user.crit> gohan13 kernel: 1st 0xd99d6500 pipe mutex @ /local0/scratch/usr/src/sys/kern/sys_pipe.c:450 Mar 24 09:02:29 <user.crit> gohan13 kernel: 2nd 0xd971cddc process lock @ /local0/scratch/usr/src/sys/kern/kern_sig.c:2093 Those source references are from a -current kernel from last night. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE8nlKXWry0BWjoQKURAoN0AKDv7/vBjrBJoUs5tyKZnMp2C6O11QCfUQhX 6wg8qJPRd73jwJa5Pgedpdg= =rt/D -----END PGP SIGNATURE-----help
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