netdev - 3.3-rc6 netjet.ko sleeping while in atomic.

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Date:	Wed, 14 Mar 2012 14:16:50 -0500
From:	Shaun Ruffell <sruffell@...ium.com>
To:	Karsten Keil <isdn@...ux-pingi.de>
Cc:	netdev@...r.kernel.org
Subject: 3.3-rc6 netjet.ko sleeping while in atomic.

Karsten,

I hit this today when unloading netjet.ko which was attached to a
Digium TDM400 card. Looks like flush_work_sync() is called while in
a spin_lock_irqsave() block. Not sure if it matters to you but I
thought I would send it along:

  BUG: sleeping function called from invalid context at kernel/workqueue.c:2445
  in_atomic(): 1, irqs_disabled(): 1, pid: 30652, name: modprobe
  3 locks held by modprobe/30652:
   #0:  (&__lockdep_no_validate__){......}, at: [<c0669fd2>] driver_detach+0x37/0x95
   #1:  (&__lockdep_no_validate__){......}, at: [<c0669fde>] driver_detach+0x43/0x95
   #2:  (&(&card->lock)->rlock){-.-...}, at: [<fa6f4657>] nj_release+0x14b/0x1b0 [netjet]
  irq event stamp: 4262
  hardirqs last  enabled at (4261): [<c0476648>] debug_check_no_locks_freed+0x7a/0x138
  hardirqs last disabled at (4262): [<c07be2ea>] _raw_spin_lock_irqsave+0x18/0x7f
  softirqs last  enabled at (1564): [<c0430cc1>] __do_softirq+0x10c/0x2fe
  softirqs last disabled at (1517): [<c04040b2>] call_on_stack+0x12/0x18
  Pid: 30652, comm: modprobe Tainted: G           O 3.3.0-rc6.sruffelldbg+ #35
  Call Trace:
   [<c04542ce>] __might_sleep+0x10b/0x197
   [<c0444df1>] start_flush_work+0x26/0x132
   [<c0474b1c>] ? trace_hardirqs_off_caller+0x18/0x92
   [<c0444f19>] flush_work_sync+0x1c/0x50
   [<c0474442>] ? lock_release_holdtime+0x68/0xca
   [<c07beb5f>] ? _raw_spin_unlock_irqrestore+0x34/0x4c
   [<c0474ba1>] ? trace_hardirqs_off+0xb/0xd
   [<c07beb5f>] ? _raw_spin_unlock_irqrestore+0x34/0x4c
   [<c06fe174>] ? skb_dequeue+0x47/0x52
   [<fa63824c>] mISDN_freedchannel+0x5e/0x63 [mISDN_core]
   [<fa69509a>] isac_release+0x9a/0xc0 [mISDNipac]
   [<fa6f4683>] nj_release+0x177/0x1b0 [netjet]
   [<c044fea8>] ? __blocking_notifier_call_chain+0x5c/0x89
   [<fa6f5ad7>] nj_remove+0x17/0x2f [netjet]
   [<c05e4bd4>] pci_device_remove+0x1e/0x3f
   [<c06698fa>] __device_release_driver+0x4e/0x96
   [<c066a02c>] driver_detach+0x91/0x95
   [<c0668bce>] bus_remove_driver+0x6e/0xcf
   [<c066a399>] driver_unregister+0x42/0x6c
   [<c066a593>] ? driver_remove_file+0x14/0x16
   [<c05e4924>] pci_unregister_driver+0x2d/0x78
   [<fa6f5ab5>] nj_cleanup+0xd/0x18 [netjet]
   [<c04833c8>] sys_delete_module+0x123/0x219
   [<c045be28>] ? local_clock+0x29/0x42
   [<c049586d>] ? __audit_syscall_exit+0x2a4/0x440
   [<c07c468c>] sysenter_do_call+0x12/0x32

Cheers,
Shaun
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