uvm_fault(0xffffffff83a99090, 0xffff800023582d70, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND * 38253 83495 0 0 0x4000001 1K syz-executor 358450 78574 60929 0x10 0x1 0 syz-executor memset() at memset+0x52 ffs_write(ffff800035b914b0) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd805ff70558,ffff800035b91560,3,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a2222a8,fffffd805ff70558,fffffd80097fd270,ffff800035b91630,ffff800035b91610) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a2222a8,36,0,ffff800035b91700) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a2222a8,36,0,ffff800035b91700) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff800035b917b0) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff800035b917b0) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x57d7685a250, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff83a99090, 0xffff800023582d70, 0, 2) -> d ddb{1}> trace memset() at memset+0x52 ffs_write(ffff800035b914b0) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd805ff70558,ffff800035b91560,3,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a2222a8,fffffd805ff70558,fffffd80097fd270,ffff800035b91630,ffff800035b91610) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a2222a8,36,0,ffff800035b91700) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a2222a8,36,0,ffff800035b91700) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff800035b917b0) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff800035b917b0) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x57d7685a250, count: -7 ddb{1}> show registers rdi 0xffff800023582d70 rsi 0 rbp 0xffff800035b913d0 rbx 0x30d70 acpi_pdirpa+0x1cbe1 rdx 0 rcx 0x652 rax 0 r8 0x3290 __ALIGN_SIZE+0x2290 r9 0xffff800035b91330 r10 0x79a342a0bd201f61 r11 0xffff800023582d70 r12 0xd70 r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xfffffd805ff70558 r15 0x1 rip 0xffffffff828c9fa2 memset+0x52 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800035b911c8 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb{1}> show proc PROC (syz-executor) tid=38253 pid=83495 tcnt=2 stat=onproc flags process=0 proc=4000001 runpri=32, usrpri=76, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a222d08,0xffff80002a222a80 process=0xffff80003c3d49c0 user=0xffff800035b8c000, vmspace=0xfffffd806c6099a8 estcpu=26, cpticks=3, pctcpu=0.0, user=0, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94905 261017 58636 0 2 0 syz-executor 83495 438969 2801 0 2 0 syz-executor *83495 38253 2801 0 7 0x4000001 syz-executor 73815 326441 65241 0 2 0 syz-executor 73815 317771 65241 0 2 0x4000080 syz-executor 67848 357821 99472 0 2 0 syz-executor 67848 373517 99472 0 3 0x4000080 sbwait syz-executor 67848 6310 99472 0 2 0x4000001 syz-executor 78574 358450 21917 60929 7 0x11 syz-executor 78574 462646 21917 60929 3 0x4000090 fsleep syz-executor 79864 5427 69503 0 2 0 syz-executor 79864 17437 69503 0 3 0x4000080 fsleep syz-executor 48220 428319 83585 0 2 0x4000c80 syz-executor 48220 190613 83585 0 3 0x4000080 pipewr syz-executor 48220 138684 83585 0 3 0x4000080 fsleep syz-executor 90 252160 43374 0 3 0x80 nanoslp syz-executor 90 508878 43374 0 3 0x4000080 fsleep syz-executor 90 334313 43374 0 3 0x4000080 ttyout syz-executor 90 420225 43374 0 3 0x4000080 fsleep syz-executor 33036 314369 1 0 3 0x82 nanoslp getty 21917 29473 27790 0 2 0xc82 syz-executor 83585 412978 27790 0 2 0x3 syz-executor 99472 1130 27790 0 2 0xc82 syz-executor 43374 392597 27790 0 2 0xc82 syz-executor 58636 67220 27790 0 3 0x82 nanoslp syz-executor 65241 50339 27790 0 3 0x82 nanoslp syz-executor 69503 22194 27790 0 2 0x2 syz-executor 2801 135888 27790 0 2 0xc82 syz-executor 27790 308862 1 0 2 0x2 syz-executor 45679 241936 0 0 3 0x14200 bored smr 37688 199524 0 0 2 0x14200 zerothread 62114 208295 0 0 3 0x14200 aiodoned aiodoned 20021 8077 0 0 3 0x14200 syncer update 6990 80970 0 0 3 0x14200 cleaner cleaner 92201 129253 0 0 3 0x14200 reaper reaper 33459 307270 0 0 3 0x14200 pgdaemon pagedaemon 89834 322122 0 0 3 0x14200 bored viomb 76658 66493 0 0 3 0x40014200 acpi0 acpi0 23158 238047 0 0 3 0x40014200 idle1 89618 135769 0 0 3 0x14200 bored softnet1 66966 185197 0 0 3 0x14200 bored softnet0 77277 182188 0 0 3 0x14200 bored systqmp 40044 7260 0 0 3 0x14200 bored systq 41573 361586 0 0 3 0x14200 tmoslp softclockmp 17423 374336 0 0 3 0x40014200 tmoslp softclock 31748 307347 0 0 3 0x40014200 idle0 1 38189 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 83495 (syz-executor) thread 0xffff80002a2222a8 (38253) ddb{1}>