On Thu, Jul 16, 2015 at 06:57:30PM +0200, Emmanuel Dreyfus wrote: > Hello > > I discovered another scenario where force unmount could not work: an > unresponsive PUFFS filesystem. The filesystem got out of order during an > operation where the filesystem root vnode is locked. As a result, trying > to unmount goes this way > > sys_unmount -> namei -> namei_tryemulroot -> lookup_once -> VFS_ROOT -> > puffs_vfsop_root -> vn_lock -> VOP_LOCK and we loose. > > I can kill the userland process, but the mount remains, an any attempt > to touch it sinks in tstile. > > Any idea how can that be fixed?
Either make vnode locks interruptible, or debug puffs. I favor the former, but lost the argument a few years back. Others (including e.g. yamt) said no. -- David A. Holland dholl...@netbsd.org
