uvm_fault(0xffffffff83a0a918, 0xffff800028912004, 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 *383649 28422 0 0x2000 0x4000000 0 syz-executor ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(ffffee806c7596c8,ffff80002a7678d8,ffff80002a767908) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a7678a8) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580 namei(ffff80002a7678a8) at namei+0x7c3 sys/kern/vfs_lookup.c:250 sys_unveil(ffff80003c8cc7e8,ffff80002a767a80,ffff80002a7679d0) at sys_unveil+0x329 sys/kern/vfs_syscalls.c:1010 syscall(ffff80002a767a80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a767a80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb63cf996790, 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(0xffffffff83a0a918, 0xffff800028912004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(ffffee806c7596c8,ffff80002a7678d8,ffff80002a767908) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a7678a8) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580 namei(ffff80002a7678a8) at namei+0x7c3 sys/kern/vfs_lookup.c:250 sys_unveil(ffff80003c8cc7e8,ffff80002a767a80,ffff80002a7679d0) at sys_unveil+0x329 sys/kern/vfs_syscalls.c:1010 syscall(ffff80002a767a80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a767a80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb63cf996790, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a7676e0 rbx 0 rdx 0xffff8000015eadc0 rcx 0xffffffff rax 0xffff80003c8cc7e8 r8 0xffffffffffffffff r9 0xffffee8007ffd3a8 r10 0xa01fdbf1f8857d2d r11 0x653ea1836f3f78b4 r12 0xffffee806774c448 r13 0 r14 0 r15 0xffff800028912000 rip 0xffffffff8146be43 ufs_lookup+0x613 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a7675f0 ss 0x10 ufs_lookup+0x613: movzwl 0x4(%r15,%r14,1),%ebx ddb> show proc PROC (syz-executor) tid=383649 pid=28422 tcnt=2 stat=onproc flags process=2000 proc=4000000 runpri=32, usrpri=76, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c8cc7e8 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c8ccfb0,0xffff80003c8ccd28 process=0xffff807fffff8918 user=0xffff80002a762000, vmspace=0xffffee804cd01188 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 91448 222611 11474 0 2 0 syz-executor 91448 318264 11474 0 3 0x4000080 fsleep syz-executor 28422 356094 43890 0 4 0x82000 syz-executor *28422 383649 43890 0 7 0x4002000 syz-executor 76558 218406 37069 0 2 0 syz-executor 153 80222 94677 0 3 0x80 nanoslp syz-executor 153 4442 94677 0 3 0x4000080 fsleep syz-executor 153 313081 94677 0 2 0x4000000 syz-executor 78137 439441 79106 0 3 0x80 nanoslp syz-executor 78137 420044 79106 0 2 0x4000000 syz-executor 78137 248872 79106 0 3 0x4000080 kqsel syz-executor 78137 92496 79106 0 3 0x4000080 fsleep syz-executor 58686 92856 46265 0 2 0 syz-executor 58686 45880 46265 0 3 0x4000080 fsleep syz-executor 2818 19415 64281 0 3 0x80 nanoslp syz-executor 2818 413913 64281 0 3 0x4000080 fsleep syz-executor 2818 111244 64281 0 2 0x4000000 syz-executor 33175 302746 1 0 3 0x80 nanoslp init 79106 395234 62758 0 3 0x82 nanoslp syz-executor 43890 512582 62758 0 2 0xc82 syz-executor 11474 458467 62758 0 2 0xc82 syz-executor 64281 94419 62758 0 3 0x82 nanoslp syz-executor 94677 218741 62758 0 3 0x82 nanoslp syz-executor 37069 436453 62758 0 3 0x82 nanoslp syz-executor 95946 24481 62758 0 2 0xc82 syz-executor 46265 183221 62758 0 3 0x82 nanoslp syz-executor 62758 139707 1 0 3 0x82 kqread syz-executor 5904 256797 0 0 3 0x14200 bored smr 95781 77343 0 0 2 0x14200 zerothread 68607 446697 0 0 3 0x14200 aiodoned aiodoned 1747 58765 0 0 3 0x14200 syncer update 30938 119612 0 0 3 0x14200 cleaner cleaner 90552 523513 0 0 3 0x14200 reaper reaper 15176 409843 0 0 3 0x14200 pgdaemon pagedaemon 82599 63435 0 0 3 0x14200 bored viomb 87101 166883 0 0 3 0x40014200 acpi0 acpi0 3315 197982 0 0 2 0x14200 softnet0 57579 32723 0 0 3 0x14200 bored systqmp 75507 291526 0 0 3 0x14200 bored systq 64384 202696 0 0 3 0x40014200 tmoslp softclock 62900 192582 0 0 3 0x40014200 idle0 1 13492 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb>