[Unionfs] BUG: Unionfs 2.0 on kernel version 2.6.20-rt8 reports: circular locking deadlock detected during boot.

[Erez Zadok]

In message <e9f486400706062319h2ac76e7td4b300deb49b3569 at mail.gmail.com>, "Henri Hunnekens" writes:
> ============================================
> [ BUG: circular locking deadlock detected! ]
> --------------------------------------------
> udev_run_hotplu/720 is deadlocking current task modprobe/690
> 
> 
> 1) modprobe/690 is trying to acquire this lock:
>  [f7019558] {&info->lock}
> .. ->owner: f6e52032
> .. held by:   udev_run_hotplu:  720 [f6e52030, 121]
> 
> 2) udev_run_hotplu/720 is blocked on this lock:
>  [c2718348] {(struct rw_semaphore *)(&((struct unionfs_sb_info *)(sb)->s_fs_info
> )->rwsem)}
> .. ->owner: f6d9d932
> .. held by:          modprobe:  690 [f6d9d930, 120]

Henri, this message was held up in our mail server along with a bunch of
spam.  Sorry for the late response.  (I took out lkml from the cc list -- no
need to spam them too :-)

Anyway, we fixed a number of locking issues recently.  The latest unionfs2
releases on our Web site all have those fixes.  If you get a chance to try
them, let us know how they work for you.

Thanks,
Erez.