futex_wait_setup sleeping while atomic bug.

[Dave Jones]

Hit this overnight on Linus tree from yesterday.

BUG: sleeping function called from invalid context at include/linux/freezer.h:56
in_atomic(): 1, irqs_disabled(): 0, pid: 31948, name: trinity-c121
Preemption disabled at:[<ffffffffb90f2512>] futex_wait_setup+0xb2/0x140

CPU: 0 PID: 31948 Comm: trinity-c121 Not tainted 3.17.0-rc4+ #52
 ffffffffb9a52f2a 00000000d3f40479 ffff88008a32fd90 ffffffffb9771ba4
 0000000000000000 ffff88008a32fdb8 ffffffffb909f02c ffff88008a32ff58
 ffff88008a32ff58 0000000000000010 ffff88008a32fe30 ffffffffb90887bc
Call Trace:
 [<ffffffffb9771ba4>] dump_stack+0x4e/0x7a
 [<ffffffffb909f02c>] __might_sleep+0x11c/0x1b0
 [<ffffffffb90887bc>] get_signal+0x6c/0x720
 [<ffffffffb9002577>] do_signal+0x37/0x6f0
 [<ffffffffb9126ddb>] ? __acct_update_integrals+0x8b/0x120
 [<ffffffffb912728c>] ? acct_account_cputime+0x1c/0x20
 [<ffffffffb90ab1ab>] ? account_user_time+0x9b/0xb0
 [<ffffffffb9002c8c>] do_notify_resume+0x5c/0xa0
 [<ffffffffb977be23>] retint_signal+0x46/0x83
BUG: scheduling while atomic: trinity-c121/31948/0x00000002
Preemption disabled at:[<ffffffffb90f2512>] futex_wait_setup+0xb2/0x140

CPU: 0 PID: 31948 Comm: trinity-c121 Not tainted 3.17.0-rc4+ #52
 ffff88024d013740 00000000d3f40479 ffff88008a32fec8 ffffffffb9771ba4
 ffff8802403eee00 ffff88008a32fee0 ffffffffb909e725 0000000000000000
 ffff88008a32ff60 ffffffffb9774db7 000000000000a000 ffff8802403eee00
Call Trace:
 [<ffffffffb9771ba4>] dump_stack+0x4e/0x7a
 [<ffffffffb909e725>] __schedule_bug+0x65/0xc0
 [<ffffffffb9774db7>] __schedule+0x6a7/0xa70
 [<ffffffffb97756ee>] schedule_user+0x2e/0x90
 [<ffffffffb977bdc1>] retint_careful+0x12/0x2e
note: trinity-c121[31948] exited with preempt_count 1

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