netdev - Hung tasks related to do_filp_open in net-next (3.8.0-rc3+)

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Date:	Wed, 23 Jan 2013 13:38:32 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Hung tasks related to do_filp_open in net-next (3.8.0-rc3+)


I cranked up my 3000 NFS mounts test case on today's net-next (3.8.0-rc3+)
and about 8 of these splats.  There were around 780 mounts active
when these occurred.

Seems like the system continues OK, so not sure how important
this is...

INFO: task btserver:8756 blocked for more than 180 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btserver        D 0000000000000004     0  8756   5781 0x00000080
  ffff880404ab1bf8 0000000000000046 0000000004ab1ba8 0000000000000432
  ffff880404ab0010 ffff880402263f20 ffff880404ab1fd8 00000000000132c0
  00000000000132c0 00000000000132c0 ffff880404ab1fd8 00000000000132c0
Call Trace:
  [<ffffffff815491ea>] schedule+0x5f/0x61
  [<ffffffff815494fa>] schedule_preempt_disabled+0x13/0x1f
  [<ffffffff81547ea8>] __mutex_lock_common+0x264/0x42d
  [<ffffffff8115fadb>] ? do_last+0x1db/0xa4e
  [<ffffffff8115fadb>] ? do_last+0x1db/0xa4e
  [<ffffffff815480d0>] mutex_lock_nested+0x16/0x18
  [<ffffffff8115fadb>] do_last+0x1db/0xa4e
  [<ffffffff8115f3a5>] ? path_init+0xcd/0x2b6
  [<ffffffff8116090b>] path_openat+0xcb/0x363
  [<ffffffff810d0055>] ? __lock_acquire+0x1df/0x53d
  [<ffffffff81160ca8>] do_filp_open+0x38/0x84
  [<ffffffff8154a2db>] ? _raw_spin_unlock+0x45/0x52
  [<ffffffff8116c203>] ? __alloc_fd+0x106/0x11a
  [<ffffffff815490f9>] ? __schedule+0x561/0x5a3
8021q: adding VLAN 0 to HW filter on device eth4#621
  [<ffffffff81153bfc>] do_sys_open+0x6d/0xff
8021q: adding VLAN 0 to HW filter on device eth3#612
  [<ffffffff81153cbb>] sys_open+0x1c/0x1e
  [<ffffffff8154f629>] system_call_fastpath+0x16/0x1b
2 locks held by btserver/8756:
  #0:  (sb_writers#10){......}, at: [<ffffffff81170013>] mnt_want_write+0x1f/0x48
  #1:  (&type->i_mutex_dir_key#4){......}, at: [<ffffffff8115fadb>] do_last+0x1db/0xa4e



-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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