I had the same problem with Ubuntu 20.04 LTSP client: black screen
during boot, keyboard and mouse don't work, ssh works and "ring 0
stalled" messages in the system log. I had to switch to Ubuntu 18.04
which works fine.
CPU: AMD A8-5500B APU with Radeon(tm) HD Graphics
lshw -C display
*-display
description: VGA compatible controller
product: Trinity [Radeon HD 7560D]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:35 memory:c0000000-cfffffff ioport:f000(size=256)
memory:feb00000-feb3ffff memory:c0000-dffff
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https://bugs.launchpad.net/bugs/1863390
Title:
GPU lockup ring 0 stalled for more than X msec
Status in xserver-xorg-video-ati package in Ubuntu:
Confirmed
Bug description:
Since the update:
xserver-xorg-video-ati-hwe-18.04 (1:19.0.1-1ubuntu1~18.04.1) bionic;
which resulted from:
https://bugs.launchpad.net/fedora/+source/xserver-xorg-video-
ati/+bug/1841718
I've experienced GPU freezes where all video becomes unresponsive,
both Xorg and Ctrl+Alt terminal switching, and the GPU fan goes to
full. I am still able to access the system via SSH.
Sometimes dmesg ends up full of this message repeating over and over:
radeon 0000:01:00.0: ring 0 stalled for more than 24040msec
radeon 0000:01:00.0: GPU lockup (current fence id 0x0000000000009e44 last
fence id 0x0000000000009e49 on ring 0)
I sometimes get a few GPU soft reset which seem to fail in drm(?):
radeon 0000:01:00.0: Saved 110839 dwords of commands on ring 0.
radeon 0000:01:00.0: GPU softreset: 0x00000008
...
radeon 0000:01:00.0: Wait for MC idle timedout !
radeon 0000:01:00.0: Wait for MC idle timedout !
[drm] PCIE GART of 1024M enabled (table at 0x0000000000162000).
radeon 0000:01:00.0: WB enabled
radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00
and cpu addr 0x00000000725651ad
radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c
and cpu addr 0x00000000c3678ed8
radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118
and cpu addr 0x00000000dbd9e01b
[drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed
(scratch(0x8504)=0xCAFEDEAD)
[drm:evergreen_resume [radeon]] *ERROR* evergreen startup failed on resume
Even if the above reset doesn't happen, this freeze always results in
a unable to handle page fault" BUG in radeon_ring_backup, entered from
various call paths, eg:
BUG: unable to handle page fault for address: ffffbc2d80574ffc
...
Oops: 0000 [#1] SMP PTI
CPU: 2 PID: 11243 Comm: kworker/2:1H Not tainted 5.5.0-050500-generic
#202001262030
Workqueue: radeon-crtc radeon_flip_work_func [radeon]
RIP: 0010:radeon_ring_backup+0xc9/0x140 [radeon]
Call Trace:
radeon_gpu_reset+0xc3/0x2f0 [radeon]
radeon_flip_work_func+0x1f3/0x250 [radeon]
? __schedule+0x2e0/0x760
process_one_work+0x1b5/0x370
worker_thread+0x50/0x3d0
kthread+0x104/0x140
? process_one_work+0x370/0x370
? kthread_park+0x90/0x90
ret_from_fork+0x35/0x40
or:
BUG: unable to handle page fault for address: ffffc03901000ffc
...
Oops: 0000 [#1] SMP PTI
CPU: 3 PID: 2227 Comm: compton Not tainted 5.3.0-28-generic
#30~18.04.1-Ubuntu
RIP: 0010:radeon_ring_backup+0xd3/0x140 [radeon]
Call Trace:
radeon_gpu_reset+0xb9/0x340 [radeon]
? dma_fence_wait_timeout+0x48/0x110
? reservation_object_wait_timeout_rcu+0x19d/0x340
radeon_gem_handle_lockup.part.4+0xe/0x20 [radeon]
radeon_gem_wait_idle_ioctl+0xa6/0x110 [radeon]
? radeon_gem_busy_ioctl+0x80/0x80 [radeon]
drm_ioctl_kernel+0xb0/0x100 [drm]
drm_ioctl+0x389/0x450 [drm]
? radeon_gem_busy_ioctl+0x80/0x80 [radeon]
? __switch_to_asm+0x40/0x70
? __switch_to_asm+0x34/0x70
? __switch_to_asm+0x40/0x70
? __switch_to_asm+0x40/0x70
? __switch_to_asm+0x34/0x70
? __switch_to_asm+0x40/0x70
? __switch_to_asm+0x34/0x70
? __switch_to_asm+0x40/0x70
radeon_drm_ioctl+0x4f/0x80 [radeon]
do_vfs_ioctl+0xa9/0x640
? __schedule+0x2b0/0x670
ksys_ioctl+0x75/0x80
__x64_sys_ioctl+0x1a/0x20
do_syscall_64+0x5a/0x130
entry_SYSCALL_64_after_hwframe+0x44/0xa9
I've tried both 5.3.0-28-generic and 5.5.0-050500-generic from kernel-
ppa but that made no difference. It appears to be a bug in radeon.
Nothing specific makes this happen, just regular usage with a
compositing window manager. I'm not playing games or particularly
exercising the GPU. The last two times I was just reading in web
browser. It's also happened in the middle of the night while I was
asleep. Sometimes I have a few days uptime, sometimes it happens in
less than 24 hours from boot.
This never happened before the radeon update mentioned on the first
line.
I'll attach two files of dmesg output. As per
https://wiki.ubuntu.com/X/Troubleshooting/Freeze I've installed and
started apport for next time it happens.
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