uvm_fault(0xffffffff82e5c698, 0xffff800018702004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_lookup+0x4d0: movzwl 0x4(%r15,%r12,1),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND * 86928 95879 0 0x2 0 0K syz-executor.6 ufs_lookup() at ufs_lookup+0x4d0 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd807222e7a8,ffff80002a240518,ffff80002a240548) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a2404e8) at vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 namei(ffff80002a2404e8) at namei+0x55a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002a2732a8,ffffff9c,7b3aa5f967d0,8) at dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 syscall(ffff80002a2406f0) at syscall+0x5f0 mi_syscall sys/sys/syscall_mi.h:182 [inline] syscall(ffff80002a2406f0) at syscall+0x5f0 sys/arch/amd64/amd64/trap.c:591 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b3aa5f967c0, count: 8 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.