Created attachment 227044 [details] Stack trace On an AMD Ryzen 4700U-based HP Envy x360, when I load amdgpu, I get an `panic: malloc: called with spinlock or critical section held` kernel panic. This happens on 5.5 from Ports and 5.6-wip from GitHub. drm-kmod 5.4 doesn't support the iGPU. Backtrace: Unread portion of the kernel message buffer: taskqueue_drain with the following non-sleepable locks held: exclusive sleep mutex vtdev (vtdev) r = 0 (0xffffffff81aea0a8) locked @ /usr/src/sys/dev/vt/vt_core.c:3012 stack backtrace: #0 0xffffffff80c902e1 at witnespanic: malloc: called with spinlock or critical section held cpuid = 6 time = 1628439111 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00c1ff4470 vpanic() at vpanic+0x187/frame 0xfffffe00c1ff44d0 panic() at panic+0x43/frame 0xfffffe00c1ff4530 malloc_dbg() at malloc_dbg+0xe2/frame 0xfffffe00c1ff4550 malloc() at malloc+0x30/frame 0xfffffe00c1ff45a0 dcn21_validate_bandwidth() at dcn21_validate_bandwidth+0x7e/frame 0xfffffe00c1ff4630 dc_validate_global_state() at dc_validate_global_state+0x2cc/frame 0xfffffe00c1ff4690 amdgpu_dm_atomic_check() at amdgpu_dm_atomic_check+0xee1/frame 0xfffffe00c1ff4940 drm_atomic_check_only() at drm_atomic_check_only+0x424/frame 0xfffffe00c1ff49c0 drm_atomic_commit() at drm_atomic_commit+0x13/frame 0xfffffe00c1ff49e0 drm_client_modeset_commit_atomic() at drm_client_modeset_commit_atomic+0x148/frame 0xfffffe00c1ff4a50 drm_client_modeset_commit_force() at drm_client_modeset_commit_force+0x66/frame 0xfffffe00c1ff4a90 drm_fb_helper_restore_fbdev_mode_unlocked() at drm_fb_helper_restore_fbdev_mode_unlocked+0x7a/frame 0xfffffe00c1ff4ac0 taskqueue_run_locked() at taskqueue_run_locked+0xaa/frame 0xfffffe00c1ff4b40 taskqueue_thread_loop() at taskqueue_thread_loop+0xc2/frame 0xfffffe00c1ff4b70 fork_exit() at fork_exit+0x80/frame 0xfffffe00c1ff4bb0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00c1ff4bb0 Log is attached.