I met same panic too, and enabled lockdep in kernel 4.19.67, the log is:
[17672.449102] RIP: 0033:0x7ff5680c4437
[17672.449643] Code: 00 00 90 48 8b 05 59 aa 0c 00 64 c7 00 26 00 00 00 48 c7
c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d 29 aa 0c 00 f7 d8 64 89 01 48
[17672.452380] RSP: 002b:00007ffcf6fa8a38 EFLAGS: 00003246 ORIG_RAX:
0000000000000010
[17672.453502] RAX: 0000000000000000 RBX: 00007ffcf6fa8da0 RCX: 00007ff5680c4437
[17672.454558] RDX: 00007ffcf6fa8ab0 RSI: 0000000040106442 RDI: 000000000000000e
[17672.455613] RBP: 00007ffcf6fa8ab0 R08: 000000000000000e R09: 0000000100311000
[17672.456667] R10: 0000000000000001 R11: 0000000000003246 R12: 0000000040106442
[17672.457731] R13: 000000000000000e R14: 0000000000000000 R15: 0000000000000000
[17672.459051] ================================================
[17672.459901] WARNING: lock held when returning to user space!
[17672.460762] 4.19.67 #6 Tainted: G E
[17672.461630] ------------------------------------------------
[17672.462475] Xorg/2857 is leaving the kernel with locks still held!
[17672.463394] 2 locks held by Xorg/2857:
[17672.463960] #0: 0000000092bc956a (reservation_ww_class_acquire){+.+.}, at:
qxl_release_reserve_list+0x63/0x150 [qxl]
[17672.465532] #1: 0000000014261f9b (reservation_ww_class_mutex){+.+.}, at:
ttm_eu_reserve_buffers+0x3c1/0x5c0 [ttm]
So it should be not release ww lock when exit, after parse, it's corresponding
to ww_mutex_lock_slow_interruptible in ttm_eu_reserve_buffers. I review
ttm_eu_reserve_buffers and qxl_release_reserve_list in the matser kernel 5.10,
the function logic is still same, so I beleive this issue should still exist in
kernel tip code.
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https://bugs.launchpad.net/bugs/1813620
Title:
Xorg indefinitely hangs in kernelspace at least 2-3 times a day
Status in linux package in Ubuntu:
Confirmed
Bug description:
The graphical environment seems to hang when scrolling web pages in
Firefox. Can't reliably reproduce during every scrolling, but it has
happened at least 5 times in the past 7 days. Happens in Kubuntu VM-s
running under KVM and QEMU (3.1.0) on multiple host machines.
This issue only started to happen sometime this month. First these
VM-s were running 18.04 so I was hoping that updating them to 18.10
would help, but it didn't. I'm guessing that some kernel update for
both bionic and cosmic causes this.
Since this bug causes the graphical environment to become totally
unresponsive, this has already already cost me some lost data, but
very fortunately not much.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-13-generic 4.18.0-13.14
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jotik 1962 F.... pulseaudio
Date: Mon Jan 28 18:09:57 2019
HibernationDevice: RESUME=UUID=9dfc65ab-a122-4254-8806-a580fea3c953
InstallationDate: Installed on 2015-10-18 (1197 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
Lsusb:
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
ProcFB: 0 qxldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-13-generic
root=UUID=78ee528a-a065-4522-b2ca-a1959850a740 ro console=ttyS0 verbose
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-4.18.0-13-generic N/A
linux-backports-modules-4.18.0-13-generic N/A
linux-firmware 1.175.1
RfKill:
SourcePackage: linux
UpgradeStatus: Upgraded to cosmic on 2019-01-20 (7 days ago)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.11.0-20180624_124920-prayer
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-2.3
dmi.modalias:
dmi:bvnSeaBIOS:bvr1.11.0-20180624_124920-prayer:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.3:cvnQEMU:ct1:cvrpc-i440fx-2.3:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-2.3
dmi.sys.vendor: QEMU
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
DistroRelease: Ubuntu 19.04
InstallationDate: Installed on 2015-10-18 (1387 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
Package: linux (not installed)
Tags: disco
Uname: Linux 5.2.0-050200rc1-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: Upgraded to disco on 2019-04-16 (112 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
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