http://bugzilla.suse.com/show_bug.cgi?id=1029634 Bug ID: 1029634 Summary: kernel panic after wakeup from STR / on switching terminals / displays with 4.4.49-16-default Classification: openSUSE Product: openSUSE Distribution Version: Leap 42.2 Hardware: Other OS: Other Status: NEW Severity: Major Priority: P5 - None Component: Kernel Assignee: kernel-maintainers@forge.provo.novell.com Reporter: okurz@suse.com QA Contact: qa-bugs@suse.de CC: anton.smorodskyi@suse.com, sebastian.chlad@novell.com, tiwai@suse.com, wvvelzen@gmail.com Depends on: 1018911 Found By: --- Blocker: --- Created attachment 717661 --> http://bugzilla.suse.com/attachment.cgi?id=717661&action=edit screenshot showing kernel panic stack trace +++ This bug was initially created as a clone of Bug #1018911 +++ ## observation On DELL Latitude E7250 after waking up the system from STR in the docking station after some seconds the system freezes and only shows a blinking caps lock LED, i.e. kernel panic. I assume it can also be reproduced by switching displays with xrandr and/or also when switching from vt7 with X to vt1 under these circumstances, i.e. after wakeup from standby. Once so far I managed to switch to text terminal and observe an OOM message and a stack trace (see screenshot). As the problem commonly was triggered by switching displays and the stack trace mentions drm I assume the problem is related to the graphics driver but because it takes some seconds for the system to crash it might also be a critical OOM happening. kdump is enabled, no crash dump was recorded in the filesystem so far. Reason might be I am running cryptlvm? ## reproducible For me the procedure which seems to reproduce it consistently is as follows * put system to STR in the docking station * wait for system to be in STR * close lid * remove from dock * put it back to dock * open lid (system starts up) * call `xrandr --outpxrandr --output eDP1 --primary --auto --output DP1-1 --off; xrandr --output eDP1 --primary --auto --output DP1-1 --auto --left-of eDP1` * wait some seconds * observe the problem (blinking caps lock led, system does not react anymore) ## expected results last good should be linux 4.4.36, at least I do not recall observing this problem in before the last kernel update, at least not that often. Expected: Obviously the kernel should not crash here. ## problem H1. regression in kernel update H1.1 4.4.27-2.1 -> 4.4.49-16 H1.2 4.4.36-5.1 -> 4.4.49-16 H1.3 4.4.36-8.1 -> 4.4.49-16 H1.4 4.4.46-11.1 -> 4.4.49-16 H2. regression in graphics driver H3. OOM since some package update ## further information The problem might be related to what Anton is observing since 4.4.36 in bug 1018911 BIOS: [ 0.000000] DMI: Dell Inc. Latitude E7250/0TVD2T, BIOS A07 09/01/2015 kernel command line: [ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-4.4.49-16-default root=/dev/mapper/system-root ro loader=syslinux quiet resume=/dev/system/swap splash=silent quiet showopts crashkernel=103M,high crashkernel=72M,low graphics controller: 00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) -- You are receiving this mail because: You are on the CC list for the bug.