uvm_fault(0xffffffff839d7e30, 0xffff800027dd5ff8, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ffs_indirtrunc+0x699: movq 0(%rax,%rbx,8),%rbx TID PID UID PRFLAGS PFLAGS CPU COMMAND 310102 2862 0 0 0x4000000 0 syz-executor *470529 43514 0 0x2 0 1K syz-executor ffs_indirtrunc(fffffd806b5ed168,fffffffffffffff4,e19a0,ffffffffffffffff,0,ffff80002a3cfd48) at ffs_indirtrunc+0x699 sys/ufs/ffs/ffs_inode.c:495 ffs_truncate(fffffd806b5ed168,0,0,ffffffffffffffff) at ffs_truncate+0x103f sys/ufs/ffs/ffs_inode.c:297 ufs_inactive(ffff80002a3cfea0) at ufs_inactive+0x202 sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(fffffd805e196dd8,ffff80002a270018) at VOP_INACTIVE+0x104 sys/kern/vfs_vops.c:498 vput(fffffd805e196dd8) at vput+0xe5 sys/kern/vfs_subr.c:790 VOP_REMOVE(fffffd805d9088c0,fffffd805e196dd8,ffff80002a3d0008) at VOP_REMOVE+0x199 sys/kern/vfs_vops.c:336 dounlinkat(ffff80002a270018,ffffff9c,755f5b1c1540,0) at dounlinkat+0x1c4 sys/kern/vfs_syscalls.c:1904 syscall(ffff80002a3d0180) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3d0180) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x755f5b1c19f0, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.