BUG: sleeping function called from invalid context at kernel/rtmutex.c:683

using kernel 2.6.29-rt3, i get the following BUG, when waking from suspend-to-ram:

[13899.995628] BUG: sleeping function called from invalid context at
kernel/rtmutex.c:683
[13899.995630] in_atomic(): 0, irqs_disabled(): 1, pid: 15817, name:
pm-suspend
[13899.995632] Pid: 15817, comm: pm-suspend Not tainted 2.6.29-rt3-tip #29
[13899.995634] Call Trace:
[13899.995642]  [<ffffffff80242a2c>] __might_sleep+0xfc/0x100
[13899.995647]  [<ffffffff8052c151>] rt_spin_lock+0x81/0x90
[13899.995651]  [<ffffffff80219555>] read_persistent_clock+0x15/0x40
[13899.995655]  [<ffffffff802779ee>] timekeeping_suspend+0xe/0x90
[13899.995658]  [<ffffffff8044cf89>] sysdev_suspend+0xc9/0x220
[13899.995663]  [<ffffffff802880b5>] suspend_devices_and_enter+0x1a5/0x220
[13899.995666]  [<ffffffff802882c6>] enter_state+0x166/0x1e0
[13899.995668]  [<ffffffff802883fa>] state_store+0xba/0x100
[13899.995672]  [<ffffffff803bb217>] kobj_attr_store+0x17/0x20
[13899.995675]  [<ffffffff8035e0e5>] sysfs_write_file+0xc5/0x140
[13899.995679]  [<ffffffff802fb4db>] vfs_write+0xcb/0x190
[13899.995682]  [<ffffffff802fb690>] sys_write+0x50/0x90
[13899.995686]  [<ffffffff802120c2>] system_call_fastpath+0x16/0x1b

best, tim

[email protected]
http://tim.klingt.org

Avoid the world, it's just a lot of dust and drag and means nothing in
the end.
  Jack Kerouac