On Tue, Oct 13, 2015 at 5:35 PM, Christoph Mathys <eraserix@xxxxxxxxx> wrote:
> Can anyone reproduce this? Any ideas? dmesg does not contain any funny
> reports...
It is actually not true that there are no funny reports. After
enabling more debug options I now get the BUG below once per second.
There are other callpaths than the one below that trigger this
message, but they all go through the function
intel_pipe_update_start().
[ 17.694307] BUG: sleeping function called from invalid context at
kernel/locking/rtmutex.c:917
[ 17.694308] in_atomic(): 0, irqs_disabled(): 1, pid: 102, name: kworker/3:1
[ 17.694309] 2 locks held by kworker/3:1/102:
[ 17.694326] #0: ("events"){.+.+.+}, at: [<ffffffff81079e60>]
process_one_work+0x170/0x8b0
[ 17.694328] #1: ((&intel_crtc->mmio_flip.work)){+.+...}, at:
[<ffffffff81079e60>] process_one_work+0x170/0x8b0
[ 17.694329] irq event stamp: 21082
[ 17.694330] hardirqs last enabled at (21081): [<ffffffff810ed791>]
ktime_get_raw+0x61/0x100
[ 17.694347] hardirqs last disabled at (21082): [<ffffffffa02fabf3>]
intel_pipe_update_start+0x113/0x640 [i915]
[ 17.694349] softirqs last enabled at (0): [<ffffffff81057591>]
copy_process.part.34+0x5e1/0x1d50
[ 17.694350] softirqs last disabled at (0): [< (null)>]
(null)
[ 17.694351] CPU: 3 PID: 102 Comm: kworker/3:1 Tainted: G
E 4.1.7-realtime-2-rt8 #2
[ 17.694352] Hardware name: Komax AG, Dierikon Komax-PC/KMX-B75,
BIOS DD3-1-1D 08/21/2013
[ 17.694364] Workqueue: events intel_mmio_flip_work_func [i915]
[ 17.694365] ffffffff81c84a33 ffff8803fbf4fb98 ffffffff817f961d
0000000000000002
[ 17.694366] ffff8803fbf60000 ffff8803fbf4fbc8 ffffffff8108785a
ffff8803fbf4fbc8
[ 17.694367] ffff880036510808 ffff880036510808 0000000000000002
ffff8803fbf4fbf8
[ 17.694367] Call Trace:
[ 17.694370] [<ffffffff817f961d>] dump_stack+0x4a/0x61
[ 17.694372] [<ffffffff8108785a>] ___might_sleep+0x13a/0x200
[ 17.694373] [<ffffffff81800f24>] rt_spin_lock+0x24/0x60
[ 17.694374] [<ffffffff8108bbac>] ? migrate_disable+0x6c/0xe0
[ 17.694375] [<ffffffff810a9bab>] prepare_to_wait+0x2b/0xa0
[ 17.694386] [<ffffffffa02faca8>] intel_pipe_update_start+0x1c8/0x640 [i915]
[ 17.694387] [<ffffffff810aa070>] ? prepare_to_wait_event+0x130/0x130
[ 17.694396] [<ffffffffa02dcf04>] intel_mmio_flip_work_func+0x64/0x310 [i915]
[ 17.694397] [<ffffffff810b2d2f>] ? __lock_is_held+0x5f/0x90
[ 17.694399] [<ffffffff81079f0f>] process_one_work+0x21f/0x8b0
[ 17.694400] [<ffffffff81079e60>] ? process_one_work+0x170/0x8b0
[ 17.694402] [<ffffffff8107a709>] worker_thread+0x169/0x4e0
[ 17.694404] [<ffffffff8107a5a0>] ? process_one_work+0x8b0/0x8b0
[ 17.694405] [<ffffffff81081054>] kthread+0xe4/0x100
[ 17.694406] [<ffffffff810b5a4d>] ? trace_hardirqs_on+0xd/0x10
[ 17.694407] [<ffffffff81080f70>] ? kthread_create_on_node+0x240/0x240
[ 17.694409] [<ffffffff81801d62>] ret_from_fork+0x42/0x70
[ 17.694410] [<ffffffff81080f70>] ? kthread_create_on_node+0x240/0x240
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