Comment 0 for bug 1988990

Booting the SiFive HiFive Unmatched with a Radeon graphics shows CPU stall:

[ 30.802483] [drm] Initialized radeon 2.50.0 20080528 for 0000:07:00.0 on minor 0
[ 52.010316] watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [systemd-udevd:160]
[ 52.017321] Modules linked in: gpu_sched radeon i2c_algo_bit drm_ttm_helper ttm drm_display_helper cec rc_core drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm nvme nvme_core backlight
[ 52.035426] CPU: 0 PID: 160 Comm: systemd-udevd Not tainted 5.19.0-1002-generic #6-Ubuntu
[ 52.043279] Hardware name: SiFive HiFive Unmatched A00 (DT)
[ 52.048755] epc : apply_relocate_add+0x12a/0x278
[ 52.053328] ra : apply_relocate_add+0x88/0x278
[ 52.057840] epc : ffffffff80008280 ra : ffffffff800081de sp : ffffffc804253c80
[ 52.065134] gp : ffffffff81e2e7d8 tp : ffffffd881a25b00 t0 : ffffffff024e7766
[ 52.072342] t1 : ffffffff02693e16 t2 : 0000000000003d01 s0 : ffffffc804253d20
[ 52.079552] s1 : ffffffc896cd69d0 a0 : 0000000000003d01 a1 : ffffffff024b4000
[ 52.086761] a2 : ffffffff02693e12 a3 : ffffffff02693e12 a4 : 000000000002caa0
[ 52.093970] a5 : ffffffc8967e07c0 a6 : 000000000001e10d a7 : 00000000ffffffff
[ 52.101179] s2 : ffffffc896cd5b10 s3 : ffffffc896cd5c10 s4 : 0000000000000017
[ 52.108388] s5 : fffffffffffff000 s6 : 0000000000000014 s7 : ffffffc896784fc0
[ 52.115598] s8 : ffffffff810014f0 s9 : 0000000000000033 s10: 000000000001e10d
[ 52.122807] s11: 0000000000003d00 t3 : 0000000000000100 t4 : ffffffff80007d98
[ 52.130016] t5 : 000000000042ff00 t6 : ffffffff02cec000
[ 52.135254] status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000005
[ 52.143244] [<ffffffff8009f616>] load_module+0x810/0x9e6
[ 52.148458] [<ffffffff8009fa10>] __do_sys_finit_module+0x98/0xf4
[ 52.154472] [<ffffffff8009fa90>] sys_finit_module+0x24/0x2c
[ 52.160018] [<ffffffff80003a18>] ret_from_syscall+0x0/0x2
[ 76.010316] watchdog: BUG: soft lockup - CPU#0 stuck for 43s! [systemd-udevd:160]

Best regards

Heinrich