On (10/02/2012 22:41), Florian Smeets wrote: > Hi, > > if you set WRKDIRPREFIX to a tmpfs mountpoint and try to build audio/gsm > from ports one of the mv processes gets stuck in state tmpfs quite > often. Traces from a kernel with WITTNESS and DEBUG_VFS_LOCKS are > available here http://tb.smeets.im/~flo/tmpfs.txt
It's because of incorrect vnode locking order in tmpfs_rename. Issue is known and tmpfs is not the only file system suffering from it (e.g. ext2). There two ways of working around it in tree: * UFS: try locking vnode, unlock all vnodes on failure, restart, relookup vnodes needed. * ZFS: introduce directory entry locks to guarantee fvp won't disappear, fdvp can be safely traversed, etc. That won't be easy.. UFS-way would be a good temporal solution, but I think we should work on improving VOP_RENAME() in a long run. I'll try to prepare a patch in several days. Thanks, Gleb. _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
