On Mon 24-03-14 20:44:14, Sasha Levin wrote: > On 03/24/2014 05:48 PM, Jan Kara wrote: > >>>[ 339.948946] ** 4194304 ffff8805ac03ba38 [eventpoll] ffff8806ec051fe0 > >>>[eventpoll] ffffffff84666040 ffff88056c73e7b0 (null) > > OK, great. So finally we have something useful. We know we have problems > >with [eventpoll] dentry. That is actually a special filesystem not mounted > >anywhere - likely you get to that dentry through/proc/<pid>/fd/. Now > >eventpoll is interesting because it uses single anon inode for all > >eventpoll instances. And that inode should stay in place as long as > >eventpoll filesystem exists. So it's not clear how come that inode is > >freed. The basic check of handling of inode use count didn't find anything > >suspicious. But I can check in more detail and if I fail, we now have a > >pretty narrow area where to look... > > Seems like it's not specific to eventpoll, I saw the same error message with > "eventfd" and "perf_event". Yup, all these use anon_inode_getfile() so it all points to the fact that for some reason we freed anon_inode_inode. But I don't see where the problem is. Can you maybe make 'anon_inode_inode' external to fs/anon_inodes.c and dump stack for all iput() calls to anon_inode_inode? There must be some suckers which don't belong there... Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
