uvm_fault(0xffffffff83a6b080, 0xffff800020852004, 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 *451537 5680 0 0 0x4000000 0 syz-executor ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffff1006ea4adb8,ffff80002cc9afa0,ffff80002cc9afd0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002cc9af70) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580 namei(ffff80002cc9af70) at namei+0x7c3 sys/kern/vfs_lookup.c:250 vn_open(ffff80002cc9af70,10223,0) at vn_open+0x22e sys/kern/vfs_vnops.c:109 doopenat(ffff80003c8ea7e8,ffffff9c,200000000000,10622,0,0,d434d4e1c3fbe670) at doopenat+0x352 sys/kern/vfs_syscalls.c:1162 sys_openat(ffff80003c8ea7e8,ffff80002cc9b210,ffff80002cc9b160) at sys_openat+0x58 sys/kern/vfs_syscalls.c:1101 syscall(ffff80002cc9b210) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002cc9b210) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf104e9c1de0, 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. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff83a6b080, 0xffff800020852004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffff1006ea4adb8,ffff80002cc9afa0,ffff80002cc9afd0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002cc9af70) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580 namei(ffff80002cc9af70) at namei+0x7c3 sys/kern/vfs_lookup.c:250 vn_open(ffff80002cc9af70,10223,0) at vn_open+0x22e sys/kern/vfs_vnops.c:109 doopenat(ffff80003c8ea7e8,ffffff9c,200000000000,10622,0,0,d434d4e1c3fbe670) at doopenat+0x352 sys/kern/vfs_syscalls.c:1162 sys_openat(ffff80003c8ea7e8,ffff80002cc9b210,ffff80002cc9b160) at sys_openat+0x58 sys/kern/vfs_syscalls.c:1101 syscall(ffff80002cc9b210) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002cc9b210) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf104e9c1de0, count: -9 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002cc9abd0 rbx 0 rdx 0 rcx 0xffffffff rax 0xffff80003c8ea7e8 r8 0xffffffffffffffff r9 0xfffff10007ffd618 r10 0xf9c4d34dc289bdb3 r11 0x1ec2a2691d17bd50 r12 0xfffff1006b456550 r13 0 r14 0 r15 0xffff800020852000 rip 0xffffffff830d2a13 ufs_lookup+0x613 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002cc9aae0 ss 0x10 ufs_lookup+0x613: movzwl 0x4(%r15,%r14,1),%ebx ddb> show proc PROC (syz-executor) tid=451537 pid=5680 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c8eaa80,0xffff80003c8eb4f0 process=0xffff80002a7dad20 user=0xffff80002cc96000, vmspace=0xfffff1006bbb3748 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 90602 123604 98558 60929 2 0x10 syz-executor 90602 118640 98558 60929 3 0x4000090 fsleep syz-executor 85053 160873 71570 0 2 0xc80 syz-executor 85053 267600 71570 0 3 0x4000080 pipewr syz-executor 85053 170684 71570 0 3 0x4000080 fsleep syz-executor 10639 135785 359 0 3 0x80 nanoslp syz-executor 10639 32842 359 0 3 0x4000080 sbwait syz-executor 10639 480647 359 0 3 0x4000080 fsleep syz-executor 5680 1635 41816 0 2 0 syz-executor * 5680 451537 41816 0 7 0x4000000 syz-executor 5680 420656 41816 0 3 0x4000080 fsleep syz-executor 275 196489 40279 0 3 0x80 nanoslp syz-executor 275 201650 40279 0 3 0x4000080 kqread syz-executor 275 359155 40279 0 3 0x4000080 fsleep syz-executor 75675 7600 28745 0 3 0x80 nanoslp syz-executor 75675 209136 28745 0 3 0x4000080 sbwait syz-executor 75675 350376 28745 0 3 0x4000080 fsleep syz-executor 28745 119136 62946 0 2 0xc82 syz-executor 40279 252838 62946 0 2 0xc82 syz-executor 49623 243770 1 0 3 0x100083 ttyin getty 250 246996 0 0 3 0x14280 nfsidl nfsio 31550 92692 0 0 3 0x14280 nfsidl nfsio 13142 121859 0 0 3 0x14280 nfsidl nfsio 10252 99905 0 0 3 0x14280 nfsidl nfsio 92589 243811 0 0 3 0x14280 nfsidl nfsio 75086 303434 0 0 3 0x14280 nfsidl nfsio 52043 474691 0 0 3 0x14280 nfsidl nfsio 86170 260789 0 0 3 0x14280 nfsidl nfsio 31362 373177 0 0 3 0x14280 nfsidl nfsio 79894 439023 0 0 3 0x14280 nfsidl nfsio 4196 259328 0 0 3 0x14280 nfsidl nfsio 83399 201162 0 0 3 0x14280 nfsidl nfsio 68469 45278 0 0 3 0x14280 nfsidl nfsio 12064 488721 0 0 3 0x14280 nfsidl nfsio 62556 473599 0 0 3 0x14280 nfsidl nfsio 73461 79290 0 0 3 0x14280 nfsidl nfsio 79611 26151 0 0 3 0x14280 nfsidl nfsio 80970 378551 0 0 3 0x14280 nfsidl nfsio 5731 382233 0 0 3 0x14280 nfsidl nfsio 68743 298410 0 0 3 0x14280 nfsidl nfsio 71570 231147 62946 0 3 0x82 nanoslp syz-executor 41816 162751 62946 0 2 0xc82 syz-executor 359 244619 62946 0 3 0x82 nanoslp syz-executor 98558 146290 62946 0 2 0xc82 syz-executor 62946 245672 1 0 3 0x82 nanoslp syz-executor 82832 68797 0 0 3 0x14200 bored smr 56087 184981 0 0 2 0x14200 zerothread 75142 154277 0 0 3 0x14200 aiodoned aiodoned 79320 243532 0 0 3 0x14200 syncer update 51715 466222 0 0 3 0x14200 cleaner cleaner 94053 418889 0 0 3 0x14200 reaper reaper 54688 251228 0 0 3 0x14200 pgdaemon pagedaemon 69519 463163 0 0 3 0x14200 bored viomb 32644 365931 0 0 3 0x40014200 acpi0 acpi0 61200 244703 0 0 3 0x14200 bored softnet0 58939 481345 0 0 3 0x14200 bored systqmp 74758 300201 0 0 3 0x14200 bored systq 18982 202527 0 0 3 0x40014200 tmoslp softclock 94386 64015 0 0 3 0x40014200 idle0 1 265139 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb>