uvm_fault(0xffffffff83a5ce70, 0xffff800027ef2010, 0, 2) -> d kernel: page fault trap, code=2 Stopped at ufs_dirremove+0x14a: addw %ax,0x4(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *500896 12760 0 0 0x4000000 0 syz-executor ufs_dirremove(fffffd806c4eaeb0,fffffd8071cc2000,940c,0) at ufs_dirremove+0x14a sys/ufs/ufs/ufs_lookup.c:902 ufs_rename(ffff80002a814c68) at ufs_rename+0x15e5 sys/ufs/ufs/ufs_vnops.c:1049 VOP_RENAME(fffffd806c4eaeb0,fffffd806f0fad08,ffff80002a814e38,fffffd806d9858c0,fffffd806c4ea490,ffff80002a814d88) at VOP_RENAME+0x137 sys/kern/vfs_vops.c:376 dorenameat(ffff80002a767a00,ffffff9c,200000000100,ffffff9c,200000000140) at dorenameat+0x3f7 sys/kern/vfs_syscalls.c:3070 syscall(ffff80002a814fc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a814fc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2d4fcb5a20, count: 9 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb>