I just built my threadripper box. I am running the 1950x as well as the Gigabyte Designare X399 board.
On the F10 bios I see the same results as you. Lots of systemd-udevd blocking and journalctl -u systemd-udevd is showing device “42:00.2” which is my encryption controller. However why is the log also saying it failed while handling the cpus? At least the stack in dmesg is showing ccp.
Also my stack looks a bit different than yours which has a call to netlink_broadcast_filtered
[ 1351.303225] INFO: task systemd-udevd:542 blocked for more than 120 seconds.
[ 1351.303231] Not tainted 4.18.0-1-MANJARO #1
[ 1351.303233] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1351.303235] systemd-udevd D 0 542 512 0x80000124
[ 1351.303238] Call Trace:
[ 1351.303249] ? __schedule+0x29b/0x8b0
[ 1351.303251] ? _raw_spin_unlock_irqrestore+0x20/0x40
[ 1351.303255] ? preempt_count_add+0x68/0xa0
[ 1351.303257] schedule+0x32/0x90
[ 1351.303266] __sev_do_cmd_locked+0xd7/0x270 [ccp]
[ 1351.303270] ? netlink_broadcast_filtered+0x142/0x400
[ 1351.303272] ? wait_woken+0x80/0x80
[ 1351.303278] sev_do_cmd+0x2a/0x40 [ccp]
[ 1351.303281] ? 0xffffffffc04e0000
[ 1351.303286] sev_get_api_version+0x34/0xa0 [ccp]
[ 1351.303290] ? sp_get_psp_master_device+0x63/0x80 [ccp]
[ 1351.303295] psp_pci_init+0x43/0x230 [ccp]
[ 1351.303297] ? 0xffffffffc04e0000
[ 1351.303302] sp_mod_init+0x16/0x1000 [ccp]
[ 1351.303305] do_one_initcall+0x46/0x1f5
[ 1351.303310] ? free_unref_page_commit+0x70/0xf0
[ 1351.303313] ? kmem_cache_alloc_trace+0x181/0x1d0
[ 1351.303317] ? do_init_module+0x22/0x210
[ 1351.303319] do_init_module+0x5a/0x210
[ 1351.303321] load_module+0x2295/0x24b0
[ 1351.303326] ? vmap_page_range_noflush+0x243/0x320
[ 1351.303329] ? __se_sys_init_module+0x10c/0x170
[ 1351.303331] __se_sys_init_module+0x10c/0x170
[ 1351.303335] do_syscall_64+0x5b/0x170
[ 1351.303337] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 1351.303340] RIP: 0033:0x7f0eb14a2f3a
[ 1351.303341] Code: Bad RIP value.
[ 1351.303348] RSP: 002b:00007ffde5dda238 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
[ 1351.303350] RAX: ffffffffffffffda RBX: 0000559fe9faef60 RCX: 00007f0eb14a2f3a
[ 1351.303351] RDX: 00007f0eb0d3fecd RSI: 000000000002d350 RDI: 0000559fea010120
[ 1351.303352] RBP: 00007f0eb0d3fecd R08: 0000000000000006 R09: 0000000000000005
[ 1351.303353] R10: 0000559fe9fa0010 R11: 0000000000000246 R12: 0000559fea010120
[ 1351.303354] R13: 0000559fe9fa85c0 R14: 0000000000020000 R15: 0000559fe9faef60
I tried downgrading the bios one rev but it seems to have stability issues for me where the box fails to boot sometimes and throws some error codes on the board. A restart usually causes it to get past those errors. This is kind of frustrating.