5.19.0-1004.4-generic crashes with installed radeon graphics card

[Heinrich Schuchardt]

I tried to install https://cdimage.ubuntu.com/ubuntu-server/daily-live/current/lunar-live-server-riscv64.img.gz on an SiFive HiFive Unmatches board with a Radeon graphics card. I saw a crash:

[ 22.208410] [drm] Initialized radeon 2.50.0 20080528 for 0000:07:00.0 on minor 0
[ 44.013359] watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [systemd-udevd:189]
[ 44.020117] Modules linked in: gpu_sched radeon i2c_algo_bit drm_ttm_helper ttm drm_display_helper cec rc_core drm_kms_helper rtc_da9063 syscopyarea sysfillrect da9063_regulator sysimgblt fb_sys_fops nvme drm mscc backlight macsec xhci_pci nvme_core xhci_pci_renesas macb i2c_ocores phylink
[ 44.045737] CPU: 2 PID: 189 Comm: systemd-udevd Not tainted 5.19.0-1004-generic #4-Ubuntu
[ 44.053885] Hardware name: SiFive HiFive Unmatched A00 (DT)
[ 44.059440] epc : apply_relocate_add+0x118/0x292
[ 44.064043] ra : apply_relocate_add+0x88/0x292
[ 44.068559] epc : ffffffff800088e4 ra : ffffffff80008854 sp : ffffffd89b55fc80
[ 44.075772] gp : ffffffff81e2e6c8 tp : ffffffd89bd1ce00 t0 : ffffffff02718510
[ 44.082981] t1 : ffffffff027ce160 t2 : 000000000001376b s0 : ffffffd89b55fd20
[ 44.090191] s1 : ffffffc895f8f2f8 a0 : 000000000001376b a1 : ffffffff025d4000
[ 44.097399] a2 : ffffffff027ce15c a3 : ffffffff027ce15c a4 : 000000000002cae4
[ 44.104609] a5 : 000000000003a641 a6 : 000000000001e8d6 a7 : 0000000000000000
[ 44.111818] s2 : ffffffc895f8e438 s3 : ffffffc895f8e538 s4 : 0000000000000017
[ 44.119028] s5 : fffffffffffff000 s6 : 0000000000000014 s7 : ffffffc895a3d1b0
[ 44.126236] s8 : ffffffff810014f0 s9 : 0000000000000033 s10: 000000000001e8d6
[ 44.133445] s11: 000000000001376b t3 : 0000000000000100 t4 : ffffffff80008374
[ 44.140655] t5 : 0000000000430560 t6 : ffffffff02e2c000
[ 44.145949] status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000005
[ 44.153860] [<ffffffff800a9008>] load_module+0x826/0x9fc
[ 44.159152] [<ffffffff800a9410>] __do_sys_finit_module+0x98/0xfe
[ 44.165146] [<ffffffff800a949a>] sys_finit_module+0x24/0x30
[ 44.170704] [<ffffffff80003c62>] ret_from_syscall+0x0/0x2
[ 68.013359] watchdog: BUG: soft lockup - CPU#2 stuck for 45s! [systemd-udevd:189]
[ 68.020111] Modules linked in: gpu_sched radeon i2c_algo_bit drm_ttm_helper ttm drm_display_helper cec rc_core drm_kms_helper rtc_da9063 syscopyarea sysfillrect da9063_regulator sysimgblt fb_sys_fops nvme drm mscc backlight macsec xhci_pci nvme_core xhci_pci_renesas macb i2c_ocores phylink

[Heinrich Schuchardt (xypron)]

# lspci
00:00.0 PCI bridge: SiFive, Inc. FU740-C000 RISC-V SoC PCI Express x8 to AXI4 Bridge
01:00.0 PCI bridge: ASMedia Technology Inc. ASM2824 PCIe Gen3 Packet Switch (rev 01)
02:00.0 PCI bridge: ASMedia Technology Inc. ASM2824 PCIe Gen3 Packet Switch (rev 01)
02:02.0 PCI bridge: ASMedia Technology Inc. ASM2824 PCIe Gen3 Packet Switch (rev 01)
02:03.0 PCI bridge: ASMedia Technology Inc. ASM2824 PCIe Gen3 Packet Switch (rev 01)
02:04.0 PCI bridge: ASMedia Technology Inc. ASM2824 PCIe Gen3 Packet Switch (rev 01)
02:08.0 PCI bridge: ASMedia Technology Inc. ASM2824 PCIe Gen3 Packet Switch (rev 01)
04:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller
06:00.0 Non-Volatile memory controller: Sandisk Corp PC SN520 NVMe SSD (rev 01)
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
07:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6450 / 7450/8450/8490 OEM / R5 230/235/235X OEM]

[Heinrich Schuchardt (xypron)]

Setting kernel.watchdog_thresh=60 in /etc/sysctl.d/99-watchdog_thresh.conf does not solve the problem. /etc/sysctl* is not included in the initrd and the issue occurs before the real root is mounted. 60 seconds is the maximum value.

[Heinrich Schuchardt (xypron)]

Adding sysctl.kernel.watchdog_thresh=60 to the kernel command line bypasses the problem.