While playing with 4.1.13-rt15 I stumbled across the following thread where Luis reports the same problem with i915 gpu: i915: sleeping function called from invalid context at intel_pipe_update_start/end http://www.spinics.net/lists/linux-rt-users/msg13543.html Sebastian suggested to set i915.use_mmio_flip to -1. I tried this, and this avoids the callstack that I've posted before (intel_mmio_flip_work). The BUG below is now the dominant one: [ 1513.969093] BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917 [ 1513.969094] in_atomic(): 0, irqs_disabled(): 1, pid: 2109, name: Xorg [ 1513.969095] 2 locks held by Xorg/2109: [ 1513.969110] #0: (crtc_ww_class_acquire){+.+.+.}, at: [<ffffffffa01d8a6c>] drm_modeset_lock_crtc+0x4c/0x100 [drm] [ 1513.969118] #1: (crtc_ww_class_mutex){+.+.+.}, at: [<ffffffffa01d8871>] drm_modeset_lock+0x41/0x130 [drm] [ 1513.969119] irq event stamp: 23744596 [ 1513.969121] hardirqs last enabled at (23744595): [<ffffffff810ed47f>] ktime_get+0x6f/0x120 [ 1513.969137] hardirqs last disabled at (23744596): [<ffffffffa02bca93>] intel_pipe_update_start+0x113/0x640 [i915] [ 1513.969139] softirqs last enabled at (0): [<ffffffff810565f1>] copy_process.part.33+0x5e1/0x1d50 [ 1513.969140] softirqs last disabled at (0): [< (null)>] (null) [ 1513.969141] CPU: 2 PID: 2109 Comm: Xorg Tainted: G E 4.1.13-realtime-1-rt15 #3 [ 1513.969142] Hardware name: Komax AG, Dierikon Komax-PC/KMX-B75, BIOS DD3-1-1D 08/21/2013 [ 1513.969144] ffffffff81c8606d ffff8803ec1bb958 ffffffff81802c33 0000000000000002 [ 1513.969145] ffff8803fdfb0000 ffff8803ec1bb988 ffffffff8108713a ffff8803ec1bb988 [ 1513.969146] ffff8803fa99a188 ffff8803fa99a188 0000000000000002 ffff8803ec1bb9b8 [ 1513.969146] Call Trace: [ 1513.969149] [<ffffffff81802c33>] dump_stack+0x4a/0x61 [ 1513.969151] [<ffffffff8108713a>] ___might_sleep+0x13a/0x200 [ 1513.969153] [<ffffffff8180a5e4>] rt_spin_lock+0x24/0x60 [ 1513.969155] [<ffffffff8108b47c>] ? migrate_disable+0x6c/0xe0 [ 1513.969156] [<ffffffff810a95fb>] prepare_to_wait+0x2b/0xa0 [ 1513.969167] [<ffffffffa02bcb48>] intel_pipe_update_start+0x1c8/0x640 [i915] [ 1513.969168] [<ffffffff810a9ac0>] ? prepare_to_wait_event+0x130/0x130 [ 1513.969178] [<ffffffffa02a7fc6>] intel_begin_crtc_commit+0x166/0x1e0 [i915] [ 1513.969183] [<ffffffffa02146f2>] drm_plane_helper_commit+0x112/0x2c0 [drm_kms_helper] [ 1513.969186] [<ffffffffa021493a>] drm_plane_helper_update+0x9a/0xf0 [drm_kms_helper] [ 1513.969193] [<ffffffffa01c8bc8>] __setplane_internal+0x248/0x350 [drm] [ 1513.969199] [<ffffffffa01c8df5>] drm_mode_cursor_universal+0x125/0x210 [drm] [ 1513.969205] [<ffffffffa01c8f5f>] drm_mode_cursor_common+0x7f/0x1b0 [drm] [ 1513.969212] [<ffffffffa01cd411>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 1513.969216] [<ffffffffa01bd0a9>] drm_ioctl+0x349/0x690 [drm] [ 1513.969222] [<ffffffffa01cd3d0>] ? drm_mode_setcrtc+0x630/0x630 [drm] [ 1513.969224] [<ffffffff81095585>] ? local_clock+0x25/0x30 [ 1513.969225] [<ffffffff810b2443>] ? lock_release_holdtime.part.31+0xd3/0x1a0 [ 1513.969227] [<ffffffff81203088>] do_vfs_ioctl+0x328/0x5e0 [ 1513.969228] [<ffffffff8120f2a5>] ? __fget+0x5/0x210 [ 1513.969229] [<ffffffff8120f51a>] ? __fget_light+0x2a/0xa0 [ 1513.969230] [<ffffffff812033c1>] SyS_ioctl+0x81/0xa0 [ 1513.969232] [<ffffffff8180afdb>] system_call_fastpath+0x16/0x73 Christoph -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
