uvm_fault(0xffffffff8396b6b8, 0xffff800029f06000, 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 *132114 20585 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a799210) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83894660,ffff80002a7565d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7565d0,0) 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: 0x7a040707e140, 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(0xffffffff8396b6b8, 0xffff800029f06000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a799210) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83894660,ffff80002a7565d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7565d0,0) 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: 0x7a040707e140, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a7c54c0 rbx 0xffff80002a799210 rdx 0xffff80002a787768 rcx 0xffff800029f06000 rax 0xfffffd806ccfacc0 r8 0 r9 0 r10 0x86d47efb92f36c2c r11 0x21ca11c53d4fe50a r12 0xffffffff8169cbb0 endtsleep r13 0xffff80002a756538 r14 0xffff80002a799210 r15 0 rip 0xffffffff82c75732 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a7c54a0 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=132114 pid=20585 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b506558,0xffff80002a7862b8 process=0xffff8000ffffad18 user=0xffff80002a7c0000, vmspace=0xfffffd806ccd6d08 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *20585 132114 175 0 7 0 syz-executor 20585 308989 175 0 2 0x4000000 syz-executor 33130 18337 5993 0 2 0 syz-executor 33130 464788 5993 0 3 0x4000080 kqread syz-executor 33130 81076 5993 0 3 0x4000080 piperd syz-executor 93330 505091 1 0 3 0x80 nanoslp init 11123 300887 92242 0 3 0x80 nanoslp syz-executor 11123 490993 92242 0 3 0x4000080 msgwait syz-executor 11123 488829 92242 0 3 0x4000080 fsleep syz-executor 17040 109491 57336 0 3 0x80 nanoslp syz-executor 17040 271177 57336 0 3 0x4000080 fifor syz-executor 17040 418344 57336 0 3 0x4000080 fsleep syz-executor 175 191682 59290 0 3 0x82 nanoslp syz-executor 31566 399398 59290 0 3 0x82 nanoslp syz-executor 95205 7629 59290 0 3 0x82 nanoslp syz-executor 71848 379560 59290 0 3 0x82 nanoslp syz-executor 5993 383117 59290 0 3 0x82 nanoslp syz-executor 57336 521088 59290 0 3 0x82 nanoslp syz-executor 92242 383249 59290 0 3 0x82 nanoslp syz-executor 77407 997 59290 0 2 0x2 syz-executor 59290 110228 1 0 3 0x82 kqread syz-executor 38985 332767 0 0 3 0x14200 bored smr 84142 90738 0 0 2 0x14200 zerothread 21345 392198 0 0 3 0x14200 aiodoned aiodoned 75623 398669 0 0 3 0x14200 syncer update 31570 20933 0 0 3 0x14200 cleaner cleaner 51827 394142 0 0 3 0x14200 reaper reaper 70982 79509 0 0 3 0x14200 pgdaemon pagedaemon 94488 465526 0 0 3 0x14200 bored viomb 88568 383144 0 0 3 0x40014200 acpi0 acpi0 85697 254103 0 0 3 0x14200 bored softnet0 51102 456064 0 0 3 0x14200 bored systqmp 50177 363020 0 0 3 0x14200 bored systq 38772 179412 0 0 3 0x40014200 tmoslp softclock 60692 432057 0 0 3 0x40014200 idle0 1 292206 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb>