Messages in this thread | | | Subject | [2.6.33-rc5] Weird deadlock when shutting down | From | Benjamin Herrenschmidt <> | Date | Fri, 29 Jan 2010 15:41:47 +1100 |
| |
Hi Ingo !
Johannes and I see this on our quad G5s... it -could- be similar to one reported a short while ago by Xiaotian Feng <xtfeng@gmail.com> under the subject [2.6.33-rc4] sysfs lockdep warnings on cpu hotplug.
Basically, the machine deadlocks right after printing the following when doing a shutdown:
halt/4071 is trying to acquire lock: (s_active){++++.+}, at: [<c0000000001ef868>] .sysfs_addrm_finish+0x58/0xc0
but task is already holding lock: (&per_cpu(cpu_policy_rwsem, cpu)){+.+.+.}, at: [<c0000000004cd6ac>] .lock_policy_rwsem_write+0x84/0xf4
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
<nothing else ... machine deadlocked here>
Any idea ?
Cheers, Ben.
| |