well, not sure how this might help?
I trued to disable all acceleration via radeon.conf file copied and edited from my Linux disk, but still I see in NetBSD's /var/log/messages:
May 14 04:13:23 netbsd10 savecore: reboot after panic: [ 43.6486328] panic: unlocking unlocked wait/wound mutex: 0xffff8fd3383ff520
May 14 04:33:18 netbsd10 savecore: reboot after panic: [ 824.3507701] panic: unlocking unlocked wait/wound mutex: 0xffff8e7d24fa0d20
May 14 04:33:18 netbsd10 savecore: system went down at Wed May 14 04:16:17 2025 May 14 04:33:18 netbsd10 savecore: writing compressed core to /var/crash/netbsd.1.core.gz May 14 04:34:00 netbsd10 savecore: writing compressed kernel to /var/crash/netbsd.1.gz
netbsd.1.core.gz is 128 MB so it will not fit into email ;) :/