Issue #3200 has been updated by peeter.

OK I haven't printed out the lock info that the "ithread16 2" is trying to 
acquire in frame 3. Will do this next time. (I believe I printed it out, but it 
was "lwe", not "drmev" that "ithread16 2" was trying to acquire in frame 3 in 
the lockmgr().)

Bug #3200: master: weston screen freezes

* Author: peeter
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
It has now happened at least four times in a row. After a few days of uptime, 
weston freezes. I can still ssh into the machine, everything else seems fine 
except the graphics screen is frozen. ps axlRH shows that weston is in state 

1001   1262      1   1261  25 199   0 266664 193568 drmev    D0+    v1    
7:36.42     /usr/local/bin/weston --use-pixman

This is the 'stuct event_lock' in 'struct drm_device', which is used among 
other things in the context of ioctls. kgdb shows this backtrace for weston: 

(kgdb) thread 1096
[Switching to thread 1096 (pid 1262/1, weston)]
#0  0xffffffff80665e76 in lwkt_switch () at /usr/src/sys/kern/lwkt_thread.c:810
810             lwkt_switch_return(td->td_switch(ntd));
(kgdb) bt
#0  0xffffffff80665e76 in lwkt_switch () at /usr/src/sys/kern/lwkt_thread.c:810
#1  0xffffffff8067300e in tsleep (ident=ident@entry=0xfffff8037b927c70, 
flags=flags@entry=1024, wmesg=<optimized out>, timo=timo@entry=0)
    at /usr/src/sys/kern/kern_synch.c:707
#2  0xffffffff8064040d in lockmgr_exclusive (lkp=lkp@entry=0xfffff8037b927c70, 
flags=flags@entry=2) at /usr/src/sys/kern/kern_lock.c:381
#3  0xffffffff83087a66 in lockmgr (flags=2, lkp=0xfffff8037b927c70) at 
#4  spin_lock_irq (lock=0xfffff8037b927c70) at 
#5  intel_crtc_has_pending_flip (crtc=<optimized out>) at 
#6  intel_crtc_wait_for_pending_flips (crtc=<optimized out>) at 
#7  intel_atomic_prepare_commit (nonblock=<optimized out>, 
state=0xfffff8042ca0f340, dev=<optimized out>)
    at /usr/src/sys/dev/drm/i915/intel_display.c:13480
#8  intel_atomic_commit (dev=<optimized out>, state=0xfffff8042ca0f340, 
nonblock=<optimized out>)
    at /usr/src/sys/dev/drm/i915/intel_display.c:13614
#9  0xffffffff83d7bf6c in drm_atomic_helper_set_config (set=0xfffff80390f8d678) 
at /usr/src/sys/dev/drm/drm/../drm_atomic_helper.c:1878
#10 0xffffffff83d54842 in drm_mode_set_config_internal 
(set=set@entry=0xfffff80390f8d678) at 
#11 0xffffffff83d54f60 in drm_mode_setcrtc (dev=0xfffff8037b927900, 
data=0xfffff80390f8d868, file_priv=<optimized out>)
    at /usr/src/sys/dev/drm/drm/../drm_crtc.c:2919
#12 0xffffffff83d704f1 in drm_ioctl (ap=<optimized out>) at 
#13 0xffffffff80627885 in dev_dioctl (dev=dev@entry=0xfffff801581b1c80, 
    data=data@entry=0xfffff80390f8d868 "\360\003\270", fflag=<optimized out>, 
    msg=msg@entry=0xfffff80390f8d960, fp=0xfffff8037acb3180) at 
#14 0xffffffff808f78e5 in devfs_fo_ioctl (fp=0xfffff8037acb3180, 
com=3228066978, data=0xfffff80390f8d868 "\360\003\270", 
    ucred=0xfffff8007370f190, msg=0xfffff80390f8d960) at 
#15 0xffffffff80697f6a in fo_ioctl (msg=<optimized out>, cred=<optimized out>, 
data=<optimized out>, com=<optimized out>, fp=0xfffff8037acb3180)
    at /usr/src/sys/sys/file2.h:84
#16 mapped_ioctl (fd=<optimized out>, com=<optimized out>, uspc_data=<optimized 
out>, map=0x0, msg=<optimized out>)
    at /usr/src/sys/kern/sys_generic.c:717
#17 0xffffffff80b96400 in syscall2 (frame=0xfffff80390f8d9f8) at 
#18 0xffffffff80b7159d in ?? () at 
#19 0x0000000000000009 in ?? ()
#20 0x00000000c06864a2 in ?? ()
#21 0x00007fffffdfc8a0 in ?? ()
#22 0x0000000000000000 in ?? ()

Not sure this is helpful but that's all I've got for now. 

I attach the output of 'ps axlRH', maybe there's something else I should look 
out for.



drmev-psalRH.out (159 KB) (54.5 KB)

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