uvm_fault(0xffffffff83a0a918, 0xffff800029ed6000, 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 *233862 40281 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a780490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8398c520,ffff80002a7672d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7672d0,0) 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: 0x6fa062b3e7f0, 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(0xffffffff83a0a918, 0xffff800029ed6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a780490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8398c520,ffff80002a7672d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7672d0,0) 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: 0x6fa062b3e7f0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a75b360 rbx 0xffff80002a780490 rdx 0xffff8000350a94e0 rcx 0xffff800029ed6000 rax 0xfffff1006bdbff00 r8 0 r9 0 r10 0x7b83e4e63443a1a4 r11 0x787a3f4199b44dbe r12 0xffffffff82270380 endtsleep r13 0xffff80002a767238 r14 0xffff80002a780490 r15 0 rip 0xffffffff822ea102 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a75b340 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=233862 pid=40281 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=0xffff8000350ac558,0xffff8000350a9a20 process=0xffff80002a783190 user=0xffff80002a756000, vmspace=0xfffff1006bdb4180 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *40281 233862 85695 0 7 0 syz-executor 40281 374590 85695 0 2 0x4000000 syz-executor 75818 402889 77059 0 2 0 syz-executor 75818 450740 77059 0 3 0x4000080 fsleep syz-executor 24827 336430 8475 0 3 0x81 nanoslp syz-executor 24827 484120 8475 0 3 0x4000081 kqsel syz-executor 24827 307103 8475 0 3 0x4000081 fsleep syz-executor 54310 63730 99707 0 3 0x80 nanoslp syz-executor 54310 464332 99707 0 3 0x4000080 sbwait syz-executor 54310 318695 99707 0 3 0x4000080 fsleep syz-executor 16528 427131 65335 -1 3 0x90 nanoslp syz-executor 16528 304694 65335 -1 3 0x4000090 ttyin syz-executor 16528 141379 65335 -1 3 0x4000090 fsleep syz-executor 22025 217510 51974 0 3 0x82 nanoslp syz-executor 16134 153949 1 0 3 0x82 nanoslp getty 26027 393466 0 0 3 0x14280 nfsidl nfsio 57281 208161 0 0 3 0x14280 nfsidl nfsio 66918 406926 0 0 3 0x14280 nfsidl nfsio 43029 27445 0 0 3 0x14280 nfsidl nfsio 16372 339720 0 0 3 0x14280 nfsidl nfsio 58388 306996 0 0 3 0x14280 nfsidl nfsio 30906 256349 0 0 3 0x14280 nfsidl nfsio 33981 58464 0 0 3 0x14280 nfsidl nfsio 29527 162182 0 0 3 0x14280 nfsidl nfsio 3379 174236 0 0 3 0x14280 nfsidl nfsio 8149 361827 0 0 3 0x14280 nfsidl nfsio 97605 393191 0 0 3 0x14280 nfsidl nfsio 8618 475990 0 0 3 0x14280 nfsidl nfsio 49906 352103 0 0 3 0x14280 nfsidl nfsio 180 122473 0 0 3 0x14280 nfsidl nfsio 77595 200502 0 0 3 0x14280 nfsidl nfsio 23780 325777 0 0 3 0x14280 nfsidl nfsio 29111 152382 0 0 3 0x14280 nfsidl nfsio 13332 142747 0 0 3 0x14280 nfsidl nfsio 11736 192524 0 0 3 0x14280 nfsidl nfsio 27641 470920 0 0 3 0x14200 acct acct 8475 405517 51974 0 3 0x82 nanoslp syz-executor 65335 327070 51974 0 3 0x82 nanoslp syz-executor 77059 309380 51974 0 3 0x82 nanoslp syz-executor 99707 478512 51974 0 3 0x82 nanoslp syz-executor 85695 271868 51974 0 3 0x82 nanoslp syz-executor 75283 493254 51974 0 3 0x82 nanoslp syz-executor 51974 418190 1 0 2 0x2 syz-executor 9246 37671 0 0 3 0x14200 bored smr 1315 396692 0 0 2 0x14200 zerothread 49871 333294 0 0 3 0x14200 aiodoned aiodoned 78241 233476 0 0 3 0x14200 syncer update 89810 194608 0 0 3 0x14200 cleaner cleaner 92925 213389 0 0 3 0x14200 reaper reaper 72110 318607 0 0 3 0x14200 pgdaemon pagedaemon 22521 275148 0 0 3 0x14200 bored viomb 28307 58068 0 0 3 0x40014200 acpi0 acpi0 90468 77161 0 0 3 0x14200 bored softnet0 30596 220249 0 0 3 0x14200 bored systqmp 43921 71706 0 0 3 0x14200 bored systq 49934 61970 0 0 3 0x40014200 tmoslp softclock 86084 12114 0 0 3 0x40014200 idle0 1 434487 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11038 12232K 12444K 166960K 12909 0 pcb 18 16K 21K 166960K 289 0 rtable 234 8K 9K 166960K 496 0 pf 34 13K 20K 166960K 179 0 ifaddr 40 7K 8K 166960K 82 0 ifgroup 51 2K 2K 166960K 117 0 sysctl 4 1K 9K 166960K 14 0 counters 33 17K 18K 166960K 71 0 ioctlops 0 0K 4K 166960K 224 0 iov 0 0K 16K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 3 0K 0K 166960K 7 0 vnodes 1414 89K 89K 166960K 1973 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 104 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 61K 97K 166960K 737 0 sigio 0 0K 0K 166960K 8 0 proc 20 25K 91K 166960K 605 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 77 0 in_multi 88 6K 7K 166960K 137 0 ether_multi 1 0K 0K 166960K 6 0 mrt 0 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 2K 166960K 471 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 136 82K 167K 166960K 8222 0 UVM aobj 13 2K 4K 166960K 18 0 pinsyscall 19 38K 96K 166960K 1884 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 17 0 NDP 11 0K 2K 166960K 53 0 temp 49 9113K 9185K 166960K 28523 0 kqueue 2 4K 27K 166960K 138 0 SYN cache 2 16K 16K 166960K 2 0 ddb>