Package: linux-image-amd64 Version: 4.19+105+deb10u3 After upgrading kernel from 4.19+105+deb10u1 to 4.19+105+deb10u3 in debian 10 vm (qemu, kvm, virt-manager, qxl graphics) there are occassional spice text console image corruptions during system boot (boot with all text messages displayed, without quiet nor splash kernel parameters).
Corrupted console contains many random characters witch different colors and does not update (freezes just before switching to high resolution text mode). Boot continues normally and one can unfreeze first console switching to second console and back (Ctrl+Alt+F2 and then Ctrl+Alt+F1). After a few minutes syslog starts to receive messages like below (repeating every 2 minutes): 2020-03-25 15:50:04 myhost kernel: [ 484.596112] INFO: task kworker/1:1:42 blocked for more than 120 seconds. 2020-03-25 15:50:04 myhost kernel: [ 484.596116] Not tainted 4.19.0-8-amd64 #1 Debian 4.19.98-1 2020-03-25 15:50:04 myhost kernel: [ 484.596118] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 2020-03-25 15:50:04 myhost kernel: [ 484.596120] kworker/1:1 D 0 42 2 0x80000000 2020-03-25 15:50:04 myhost kernel: [ 484.596149] Workqueue: events drm_fb_helper_dirty_work [drm_kms_helper] 2020-03-25 15:50:04 myhost kernel: [ 484.596152] Call Trace: 2020-03-25 15:50:04 myhost kernel: [ 484.596163] ? __schedule+0x2a2/0x870 2020-03-25 15:50:04 myhost kernel: [ 484.596168] schedule+0x28/0x80 2020-03-25 15:50:04 myhost kernel: [ 484.596177] qxl_ring_push+0x15e/0x1e0 [qxl] 2020-03-25 15:50:04 myhost kernel: [ 484.596184] ? finish_wait+0x80/0x80 2020-03-25 15:50:04 myhost kernel: [ 484.596190] qxl_push_command_ring_release+0x64/0x90 [qxl] 2020-03-25 15:50:04 myhost kernel: [ 484.596197] qxl_draw_opaque_fb+0x25a/0x3f0 [qxl] 2020-03-25 15:50:04 myhost kernel: [ 484.596203] ? __switch_to_asm+0x35/0x70 2020-03-25 15:50:04 myhost kernel: [ 484.596208] qxlfb_framebuffer_dirty+0xeb/0x180 [qxl] 2020-03-25 15:50:04 myhost kernel: [ 484.596214] ? syscall_return_via_sysret+0x33/0x83 2020-03-25 15:50:04 myhost kernel: [ 484.596227] drm_fb_helper_dirty_work+0x14e/0x160 [drm_kms_helper] 2020-03-25 15:50:04 myhost kernel: [ 484.596236] process_one_work+0x1a7/0x3a0 2020-03-25 15:50:04 myhost kernel: [ 484.596241] worker_thread+0x30/0x390 2020-03-25 15:50:04 myhost kernel: [ 484.596245] ? create_worker+0x1a0/0x1a0 2020-03-25 15:50:04 myhost kernel: [ 484.596249] kthread+0x112/0x130 2020-03-25 15:50:04 myhost kernel: [ 484.596252] ? kthread_bind+0x30/0x30 2020-03-25 15:50:04 myhost kernel: [ 484.596257] ret_from_fork+0x35/0x40 No such problem in exactly same VM but with older kernel 4.19+105+deb10u1. -- Regards, Pawel Boguslawski IB Development Team https://dev.ib.pl/
