Bug 117111

Summary:	Quitting X with xrandr rotation enabled freezes vt
Product:	Drivers	Reporter:	Michał Pecio (michal.pecio)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED INVALID
Severity:	normal	CC:	alexdeucher
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	4.4.8	Subsystem:
Regression:	No	Bisected commit-id:

Description Michał Pecio 2016-04-24 16:49:30 UTC

Steps to reproduce:
1. boot without Xorg
2. start Xorg with startx
3. enable display rotation
4. quit Xorg

At this point, the screen shows previous VT contents and some Xorg stderr spam, but no command prompt. Typing commands doesn't seem to work, CTRL+ALT+DEL too.

The system still runs and accepts ssh connections. dmesg shows nothing.

Switching between X and VTs (CTRL+ALT+Fx) works normally.

The GPU is AMD 880G IGP (HD4250).

Comment 1 Alex Deucher 2016-04-25 15:10:07 UTC

Please attach your xorg log and dmesg output.

Comment 2 Michał Pecio 2016-04-25 16:03:18 UTC

OK, so I checked Xorg log and it's missing the final line indicating clean shutdown. strace revealed that X is aborting for some reason:

<... futex resumed> )                   = 0
ioctl(12, DRM_IOCTL_GEM_CLOSE, 0x7ffdfee3d4e0) = 0
close(12)                               = 0
close(11)                               = 0
munmap(0x7f1fa4a69000, 13890560)        = 0
munmap(0x7f1fa5bef000, 2126232)         = 0
munmap(0x7f1fa4861000, 2126248)         = 0
munmap(0x7f1fa4649000, 2191808)         = 0
write(2, "Xorg: ../include/privates.h:122:"..., 89) = 89
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fad47c000
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
tgkill(2858, 2858, SIGABRT)             = 0
--- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, si_pid=2858, si_uid=1000} ---
+++ killed by SIGABRT +++

So much for a kernel bug, I guess.