uvm_fault(0xffffffff83ae0888, 0xffff80001d3825dc, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x49: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *190333 89818 0 0x2 0x1 0 syz-executor memset() at memset+0x49 ffs_write(ffff80002a82d400) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffff0806b7c6b08,ffff80002a82d4b0,3,fffff08007ffd6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a736d00,fffff0806b7c6b08,fffff08007ffd6e8,ffff80002a82d580,ffff80002a82d560) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a736d00,5b,0,ffff80002a82d640) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a736d00,5b,0,ffff80002a82d640) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a82d6f0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a82d6f0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72a5d7837c60, 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(0xffffffff83ae0888, 0xffff80001d3825dc, 0, 2) -> d ddb> trace memset() at memset+0x49 ffs_write(ffff80002a82d400) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffff0806b7c6b08,ffff80002a82d4b0,3,fffff08007ffd6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a736d00,fffff0806b7c6b08,fffff08007ffd6e8,ffff80002a82d580,ffff80002a82d560) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a736d00,5b,0,ffff80002a82d640) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a736d00,5b,0,ffff80002a82d640) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a82d6f0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a82d6f0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72a5d7837c60, count: -7 ddb> show registers rdi 0xffff80001d3825dc rsi 0 rbp 0xffff80002a82d320 rbx 0xc05dc acpi_pdirpa+0xac44d rdx 0x4 rcx 0x4 rax 0 r8 0x3a20 __ALIGN_SIZE+0x2a20 r9 0xffff80002a82d280 r10 0x7b2ab744d696185 r11 0xffff80001d3825dc r12 0x5dc r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xfffff0806b7c6b08 r15 0x1 rip 0xffffffff82f85599 memset+0x49 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002a82d118 ss 0 memset+0x49: repe stosb %es:(%rdi) ddb> show proc PROC (syz-executor) tid=190333 pid=89818 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7794d0,0xffff80002a736018 process=0xffff80002a79c490 user=0xffff80002a828000, vmspace=0xfffff0807e8798a8 estcpu=36, cpticks=7, pctcpu=0.0, user=0, sys=7, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 14631 447121 89818 0 2 0 syz-executor 14631 130234 89818 0 3 0x4000080 fsleep syz-executor 65653 82875 77983 0 2 0 syz-executor 65653 164621 77983 0 3 0x4000080 fifow syz-executor 28287 408498 47437 0 2 0 syz-executor 28287 339186 47437 0 3 0x4000080 fsleep syz-executor 28287 129254 47437 0 3 0x4000080 fsleep syz-executor 13723 456254 3313 0 3 0 vmmaplk syz-executor 13723 164302 3313 0 3 0x4000080 fsleep syz-executor 13723 123463 3313 0 2 0x4000000 syz-executor 64489 345042 1 0 3 0x100083 ttyin getty 17742 220267 57674 0 3 0x82 piperd syz-executor 3313 156567 57674 0 3 0x82 nanoslp syz-executor *89818 190333 57674 0 7 0x3 syz-executor 47437 375850 57674 0 3 0x82 nanoslp syz-executor 77983 197368 57674 0 3 0x82 nanoslp syz-executor 57674 414455 1 0 3 0x82 wait syz-executor 942 26784 1 0 3 0x1000008a kqread sshd 99219 342540 47609 73 3 0x1100090 kqread syslogd 47609 454013 1 0 3 0x100082 sbwait syslogd 27692 53186 1 0 3 0x100080 kqread resolvd 2371 517559 31097 77 3 0x100092 kqread dhcpleased 53393 229899 31097 77 3 0x100092 kqread dhcpleased 31097 94406 1 0 3 0x80 kqread dhcpleased 73954 273014 0 0 3 0x14200 bored smr 46053 441896 0 0 2 0x14200 zerothread 21640 63767 0 0 3 0x14200 aiodoned aiodoned 85412 336035 0 0 3 0x14200 syncer update 67741 122143 0 0 3 0x14200 cleaner cleaner 47525 141551 0 0 3 0x14200 reaper reaper 65515 181735 0 0 3 0x14200 pgdaemon pagedaemon 5678 141374 0 0 3 0x14200 bored viomb 34693 87026 0 0 3 0x40014200 acpi0 acpi0 30214 274397 0 0 3 0x14200 bored softnet0 15776 265158 0 0 3 0x14200 bored systqmp 3993 154511 0 0 3 0x14200 bored systq 77694 484447 0 0 3 0x40014200 tmoslp softclock 39868 5497 0 0 3 0x40014200 idle0 1 87898 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb>