uvm_fault(0xffffffff8392de70, 0xffff800022a32004, 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 *400423 76666 0 0x2 0 0 syz-executor ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd805cee5970,ffff80003c9058a0,ffff80003c9058d0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80003c905870) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567 namei(ffff80003c905870) at namei+0x7ca sys/kern/vfs_lookup.c:250 domkdirat(ffff80003c90a7e8,ffffff9c,71b3e4337460,1ff) at domkdirat+0x8b sys/kern/vfs_syscalls.c:3128 syscall(ffff80003c905a40) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c905a40) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71b3e4337500, 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(0xffffffff8392de70, 0xffff800022a32004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd805cee5970,ffff80003c9058a0,ffff80003c9058d0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80003c905870) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567 namei(ffff80003c905870) at namei+0x7ca sys/kern/vfs_lookup.c:250 domkdirat(ffff80003c90a7e8,ffffff9c,71b3e4337460,1ff) at domkdirat+0x8b sys/kern/vfs_syscalls.c:3128 syscall(ffff80003c905a40) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c905a40) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71b3e4337500, count: -7 ddb> show registers rdi 0 rsi 0x2 rbp 0xffff80003c905600 rbx 0 rdx 0 rcx 0xffffffff rax 0xffff80003c90a7e8 r8 0xffffffffffffffff r9 0xfffffd8007ffd5b0 r10 0xb01ee89d4696a276 r11 0x6ff10bf302c055b4 r12 0xfffffd8074ab2a18 r13 0 r14 0 r15 0xffff800022a32000 rip 0xffffffff81ee5f23 ufs_lookup+0x613 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c905510 ss 0x10 ufs_lookup+0x613: movzwl 0x4(%r15,%r14,1),%ebx ddb> show proc PROC (syz-executor) tid=400423 pid=76666 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7474c8,0xffff80003c90ba20 process=0xffff8000ffff9b18 user=0xffff80003c900000, vmspace=0xfffffd806cb1fa20 estcpu=36, cpticks=2, pctcpu=0.1, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 53167 456446 81906 0 2 0 syz-executor 53167 407129 81906 0 3 0x4000080 fsleep syz-executor 66721 52229 74234 0 2 0 syz-executor 66721 414240 74234 0 3 0x4000080 fsleep syz-executor 66721 296617 74234 0 3 0x4000080 fsleep syz-executor 66721 488584 74234 0 3 0x4000080 fsleep syz-executor 44325 507621 85476 0 2 0 syz-executor 44325 80278 85476 0 3 0x4000080 fsleep syz-executor 27030 180696 15305 0 2 0 syz-executor 27030 194129 15305 0 3 0x4000080 fsleep syz-executor 92235 373914 7768 0 3 0x90 nanoslp syz-executor 92235 199065 7768 0 3 0x4000090 msgwait syz-executor 92235 181716 7768 0 3 0x4000090 fsleep syz-executor 3239 446057 5201 0 2 0 syz-executor 3239 69322 5201 0 3 0x4000080 pipewr syz-executor *76666 400423 63590 0 7 0x2 syz-executor 24370 363161 1 0 3 0x100083 ttyin getty 15305 498730 63590 0 3 0x82 nanoslp syz-executor 72962 503389 0 0 3 0x14200 acct acct 81906 384878 63590 0 2 0xc82 syz-executor 85476 22222 63590 0 3 0x82 nanoslp syz-executor 74234 225801 63590 0 2 0xc82 syz-executor 7768 229730 63590 0 3 0x82 nanoslp syz-executor 5201 455537 63590 0 3 0x82 nanoslp syz-executor 63590 97891 1 0 3 0x82 wait syz-executor 84233 289726 0 0 3 0x14200 bored smr 36667 516579 0 0 2 0x14200 zerothread 27740 38935 0 0 3 0x14200 aiodoned aiodoned 11236 210339 0 0 3 0x14200 syncer update 20666 239424 0 0 3 0x14200 cleaner cleaner 73078 91142 0 0 3 0x14200 reaper reaper 5046 389012 0 0 3 0x14200 pgdaemon pagedaemon 16084 65512 0 0 3 0x14200 bored viomb 79816 327466 0 0 3 0x40014200 acpi0 acpi0 53982 364669 0 0 3 0x14200 bored softnet0 48506 314470 0 0 3 0x14200 smrbar systqmp 19627 503404 0 0 3 0x14200 bored systq 37561 501569 0 0 3 0x40014200 tmoslp softclock 51639 180546 0 0 3 0x40014200