stable/15 crash on boot with amdgpu

Hello,

I have been running 15-STABLE for a few weeks and since around three weeks ago I have had to come back to an older BE (stable/15-n283067-e9d3512bb587) because I get an amdgpu-related panic on boot.

You will find attached two crashinfos:
- core.txt.8 is with drm-66-kmod built from the ports tree,
KDB: stack backtrace:
#0 0xffffffff80bcf71d at kdb_backtrace+0x5d
#1 0xffffffff80b80316 at vpanic+0x136
#2 0xffffffff80b801d3 at panic+0x43
#3 0xffffffff81091b88 at trap_fatal+0x68
#4 0xffffffff81067b78 at calltrap+0x8
#5 0xffffffff80e0832a at lkpi_devm_device_add_group+0x3a
#6 0xffffffff84615ab2 at amdgpu_device_init+0x1cf2
#7 0xffffffff84636fc6 at amdgpu_driver_load_kms+0x16
#8 0xffffffff846268df at amdgpu_pci_probe+0x29f
#9 0xffffffff80e10dcc at linux_pci_attach_device+0x57c
#10 0xffffffff80bbe5cd at device_attach+0x43d
#11 0xffffffff80bc0323 at bus_generic_driver_added+0x73
#12 0xffffffff80bbbb89 at devclass_driver_added+0x29
#13 0xffffffff80bbbb1e at devclass_add_driver+0x11e
#14 0xffffffff80e11e2c at _linux_pci_register_driver+0xcc
#15 0xffffffff84626633 at amdgpu_evh+0x73
#16 0xffffffff80b5a5a5 at module_register_init+0x85
#17 0xffffffff80b4b12f at linker_load_module+0xc0f

- core.txt.9 is with drm-latest-kmod from pkg.
KDB: stack backtrace:
#0 0xffffffff80bcf71d at kdb_backtrace+0x5d
#1 0xffffffff80b80316 at vpanic+0x136
#2 0xffffffff80b801d3 at panic+0x43
#3 0xffffffff81091fcd at trap_pfault+0x37d
#4 0xffffffff81067b78 at calltrap+0x8
#5 0xffffffff80e1f997 at xa_load+0x77
#6 0xffffffff84536966 at drm_sched_entity_pop_job+0x86
#7 0xffffffff84535445 at drm_sched_run_job_work+0x215
#8 0xffffffff80e1ece4 at linux_work_fn+0xe4
#9 0xffffffff80be6212 at taskqueue_run_locked+0x182
#10 0xffffffff80be73e2 at taskqueue_thread_loop+0xc2
#11 0xffffffff80b36b5b at fork_exit+0x7b
#12 0xffffffff81068b9e at fork_trampoline+0xe

Is this a know bug? Is there something I can do?

Kind regards,
--
Quentin THÉBAULT