uvm_fault(0xffffffff8395b818, 0xffff800029ef6000, 0, 2) -> e kernel: page fault trap, code=2 Stopped at kcov_remote_enter+0x122: movq $0,0(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *198538 71167 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7ad210) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8383c100,ffff80002a7765d8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7765d8,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7e8378e894d0, 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(0xffffffff8395b818, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7ad210) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8383c100,ffff80002a7765d8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7765d8,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7e8378e894d0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a77d5d0 rbx 0xffff80002a7ad210 rdx 0xffff80003c90b248 rcx 0xffff800029ef6000 rax 0xfffffd806ccfff30 r8 0 r9 0 r10 0x71d7ade29b9d47b4 r11 0xea5c058a9cf90ff4 r12 0xffffffff810c1d50 endtsleep r13 0xffff80002a776540 r14 0xffff80002a7ad210 r15 0 rip 0xffffffff83245eb2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a77d5b0 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=198538 pid=71167 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c90b778,0xffff80003c90aa90 process=0xffff8000ffff9f98 user=0xffff80002a778000, vmspace=0xfffffd806ccf4460 estcpu=36, cpticks=4, pctcpu=0.0, user=2, sys=1, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 70390 195905 58011 0 3 0x80 nanoslp syz-executor 70390 391968 58011 0 3 0x4000080 fsleep syz-executor 77390 439199 13115 0 3 0x80 nanoslp syz-executor 77390 12744 13115 0 3 0x4000080 fsleep syz-executor *71167 198538 44066 0 7 0 syz-executor 71167 145660 44066 0 3 0x4000080 sbwait syz-executor 71167 381931 44066 0 2 0x4000000 syz-executor 83060 523529 76659 0 2 0xc80 syz-executor 83060 2069 76659 0 3 0x4000080 ttyout syz-executor 83060 212608 76659 0 3 0x4000080 fsleep syz-executor 1691 128367 31926 0 2 0xc80 syz-executor 1691 248553 31926 0 3 0x4000080 kqsel syz-executor 1691 270784 31926 0 3 0x4000080 fsleep syz-executor 34543 406782 52379 0 2 0xc80 syz-executor 34543 387778 52379 0 3 0x4000080 ttyout syz-executor 34543 227263 52379 0 3 0x4000080 ttyout syz-executor 34543 49265 52379 0 3 0x4000080 fsleep syz-executor 9640 89324 1 0 3 0x80 nanoslp init 30222 28977 0 0 3 0x14200 acct acct 76283 156318 98902 0 3 0x82 nanoslp syz-executor 13115 38951 98902 0 3 0x82 nanoslp syz-executor 52379 192930 98902 0 3 0x82 nanoslp syz-executor 76659 3480 98902 0 3 0x82 nanoslp syz-executor 58011 52977 98902 0 3 0x82 nanoslp syz-executor 44066 384911 98902 0 3 0x82 nanoslp syz-executor 31926 265821 98902 0 3 0x82 nanoslp syz-executor 98902 242802 1 0 3 0x82 wait syz-executor 88159 227495 0 0 3 0x14200 bored smr 51120 6943 0 0 2 0x14200 zerothread 61929 197957 0 0 3 0x14200 aiodoned aiodoned 32711 252896 0 0 3 0x14200 syncer update 18639 212881 0 0 3 0x14200 cleaner cleaner 11966 168955 0 0 3 0x14200 reaper reaper 35595 180959 0 0 3 0x14200 pgdaemon pagedaemon 58252 128203 0 0 3 0x14200 bored viomb 11041 181029 0 0 3 0x40014200 acpi0 acpi0 12964 400961 0 0 3 0x14200 bored softnet0 87973 432669 0 0 3 0x14200 bored systqmp 58420 500038 0 0 3 0x14200 bored systq 76335 185492 0 0 3 0x40014200 tmoslp softclock 66176 442235 0 0 3 0x40014200 idle0 1 496080 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb>