uvm_fault(0xffffffff83a01cb8, 0xffff800019982004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_lookup+0x613: movzwl 0x4(%r15,%r14,1),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND *243116 30380 0 0x2 0 0 syz-executor ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806cf427d0,ffff80002a879658,ffff80002a879688) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a879628) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567 namei(ffff80002a879628) at namei+0x7ca sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002a746008,ffffff9c,71de5f27e6c0,8) at dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 syscall(ffff80002a8797f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a8797f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71de5f27e6b0, 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. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff83a01cb8, 0xffff800019982004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806cf427d0,ffff80002a879658,ffff80002a879688) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a879628) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567 namei(ffff80002a879628) at namei+0x7ca sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002a746008,ffffff9c,71de5f27e6c0,8) at dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 syscall(ffff80002a8797f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a8797f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71de5f27e6b0, count: -7 ddb> show registers rdi 0 rsi 0x2 rbp 0xffff80002a879460 rbx 0 rdx 0 rcx 0xffffffff rax 0xffff80002a746008 r8 0xffffffffffffffff r9 0xfffffd8007ffd888 r10 0x216cda1c9db4c0e6 r11 0x36e3aa16e54bc48c r12 0xfffffd806cda8c10 r13 0 r14 0 r15 0xffff800019982000 rip 0xffffffff81242cd3 ufs_lookup+0x613 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a879370 ss 0x10 ufs_lookup+0x613: movzwl 0x4(%r15,%r14,1),%ebx ddb> show proc PROC (syz-executor) tid=243116 pid=30380 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a746f98,0xffff80002a746a78 process=0xffff80002a7ae410 user=0xffff80002a874000, vmspace=0xfffffd807e7d08a8 estcpu=36, cpticks=9, pctcpu=0.0, user=0, sys=9, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 57026 41629 12748 0 2 0xc80 syz-executor 57026 21255 12748 0 3 0x4000080 lockf syz-executor 57026 403974 12748 0 3 0x4000080 fsleep syz-executor 86703 334959 91319 0 2 0xc80 syz-executor 86703 269679 91319 0 3 0x4000080 lockf syz-executor 86703 57572 91319 0 3 0x4000080 lockf syz-executor 86703 453611 91319 0 3 0x4000080 fsleep syz-executor 44387 160679 1 0 3 0x80 nanoslp init 25013 458355 0 0 3 0x14200 acct acct 91319 430974 66087 0 2 0xc82 syz-executor 12748 514781 66087 0 2 0xc82 syz-executor *30380 243116 66087 0 7 0x2 syz-executor 84549 320819 66087 0 3 0x82 wait syz-executor 66087 236384 1 0 3 0x82 wait syz-executor 42566 302149 0 0 3 0x14200 bored smr 44539 214786 0 0 2 0x14200 zerothread 28651 481056 0 0 3 0x14200 aiodoned aiodoned 41147 213134 0 0 3 0x14200 syncer update 77030 446534 0 0 3 0x14200 cleaner cleaner 65382 118178 0 0 3 0x14200 reaper reaper 67630 14270 0 0 3 0x14200 pgdaemon pagedaemon 20769 389873 0 0 3 0x14200 bored viomb 60227 379870 0 0 3 0x40014200 acpi0 acpi0 35669 155500 0 0 3 0x14200 bored softnet0 87119 308469 0 0 3 0x14200 smrbar systqmp 86814 29991 0 0 3 0x14200 bored systq 15315 163300 0 0 3 0x40014200 tmoslp softclock 74627 358634 0 0 3 0x40014200 idle0 1 139027 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb>