Date: Tue, 31 Jul 2007 01:26:06 +0200 From: Peter Schuller <peter.schuller@infidyne.com> To: freebsd-current@freebsd.org Cc: Pawel Jakub Dawidek <pjd@freebsd.org>, current@freebsd.org Subject: Re: (ZFS?): panic: lockmgr: locking against myself Message-ID: <200707310126.06923.peter.schuller@infidyne.com> In-Reply-To: <200707292157.09742.peter.schuller@infidyne.com> References: <200707282028.37102.peter.schuller@infidyne.com> <20070728175426.GF1092@garage.freebsd.pl> <200707292157.09742.peter.schuller@infidyne.com>
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> vnode 0xffffff00037473e0: tag devfs, type VDIR > usecount 0, writecount 0, refcount 1 mountedhere 0xffffff0003745ca0 > flags (VV_ROOT) > lock type devfs: EXCL (count 1) by thread 0xffffff00010e6680 (pid 1) Some additional facts: Looking at the printouts, there is always a sequence of three or more (three at least twice; more than three at least once) vrele():s of the same vnode, in both the successful case and the panicing case. There are no vrele():s of any other vnodes in either case. Inserting enter/exit debug printouts in mountcheckdirs() confirms that all calls occur within the bounds of a single call to mountcheckdirs(). Does not this imply there is some locking mismatch in the non-ZFS specific code? I must admit I find the locking confusing; with several locking/unlocking functions/macros intermixed at different levels in the callstack. My (incorrect) reading was that this panic should always be happening, which is obviously not the case. Running with vfs.zfs.debug=1 confirms that vdev_geom open/attach/detach is happening prior to any vrele() even in the panicing case (i.e., zfs pool discovery seems to complete). In the case of an expected provider not being found, vd->vdev_devid is NULL in vdev_geom_open(), based on the "provider not found" debug printout (perhaps normal?). -- / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller@infidyne.com>' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org
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