uvm_fault(0xffffffff8392b698, 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 *245116 35969 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7ae410) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83891f40,ffff80002a7885d8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7885d8,0) 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: 0x71ef28a20320, 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(0xffffffff8392b698, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7ae410) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83891f40,ffff80002a7885d8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7885d8,0) 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: 0x71ef28a20320, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff800035ce55b0 rbx 0xffff80002a7ae410 rdx 0xffff80003a4e6a80 rcx 0xffff800029ef6000 rax 0xfffffd806cb21ed0 r8 0 r9 0 r10 0x7fd2fffb4cfbd345 r11 0xde9c81f797529716 r12 0xffffffff815217a0 endtsleep r13 0xffff80002a788540 r14 0xffff80002a7ae410 r15 0 rip 0xffffffff830ca072 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff800035ce5590 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=245116 pid=35969 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003a4e62b8,0xffff80003a4e7a20 process=0xffff8000ffff9698 user=0xffff800035ce0000, vmspace=0xfffffd8074eaf188 estcpu=36, cpticks=6, pctcpu=0.0, user=5, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 66652 263527 17489 0 2 0 syz-executor 66652 490883 17489 0 3 0x4000080 fsleep syz-executor 66652 224037 17489 0 3 0x4000080 fsleep syz-executor 71391 153634 26345 0 2 0 syz-executor 71391 133087 26345 0 3 0x4000080 fsleep syz-executor 78676 167329 86905 0 3 0x1000080 nanoslp syz-executor 78676 297377 86905 0 3 0x5000080 lockf syz-executor 78676 47734 86905 0 3 0x5000080 sbwait syz-executor 78676 97217 86905 0 3 0x5000080 fsleep syz-executor *35969 245116 99213 0 7 0 syz-executor 35969 503701 99213 0 3 0x4000080 ttyout syz-executor 35969 284788 99213 0 3 0x4000080 fsleep syz-executor 39654 522685 96412 0 2 0 syz-executor 39654 108817 96412 0 3 0x4000080 fsleep syz-executor 52250 276090 72344 0 2 0xc80 syz-executor 52250 28507 72344 0 3 0x4000080 kqread syz-executor 52250 291561 72344 0 3 0x4000080 fsleep syz-executor 17147 283433 1 0 3 0x80 nanoslp init 64112 225438 0 0 3 0x14200 acct acct 72344 215305 9882 0 3 0x82 nanoslp syz-executor 26345 297082 9882 0 3 0x82 nanoslp syz-executor 99213 340072 9882 0 3 0x82 nanoslp syz-executor 17489 56460 9882 0 3 0x82 nanoslp syz-executor 86905 158535 9882 0 3 0x82 nanoslp syz-executor 96412 155451 9882 0 3 0x82 nanoslp syz-executor 9882 370698 1 0 3 0x82 wait syz-executor 15107 518135 1 0 3 0x1000008a kqread sshd 71675 359938 82635 73 3 0x1100090 kqread syslogd 82635 23572 1 0 3 0x100082 sbwait syslogd 99294 264181 1 0 3 0x100080 kqread resolvd 19823 104648 23907 77 3 0x100092 kqread dhcpleased 99632 373609 23907 77 3 0x100092 kqread dhcpleased 23907 157905 1 0 3 0x80 kqread dhcpleased 34640 310335 0 0 3 0x14200 bored smr 53044 423739 0 0 2 0x14200 zerothread 95240 330853 0 0 3 0x14200 aiodoned aiodoned 23411 127659 0 0 3 0x14200 syncer update 95447 212336 0 0 3 0x14200 cleaner cleaner 61150 177422 0 0 3 0x14200 reaper reaper 4782 54802 0 0 3 0x14200 pgdaemon pagedaemon 21368 134882 0 0 3 0x14200 bored viomb 22676 506339 0 0 3 0x40014200 acpi0 acpi0 9445 349403 0 0 3 0x14200 bored softnet0 53030 289771 0 0 3 0x14200 bored systqmp 45121 440713 0 0 3 0x14200 bored systq 26937 55536 0 0 3 0x40014200 tmoslp softclock 36010 501222 0 0 3 0x40014200 idle0 1 31941 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 11034 12103K 12311K 166960K 12534 0 pcb 17 12K 12K 166960K 73 0 rtable 237 9K 9K 166960K 416 0 pf 33 13K 20K 166960K 168 0 ifaddr 41 7K 7K 166960K 59 0 ifgroup 50 2K 2K 166960K 76 0 sysctl 1 1K 9K 166960K 5 0 counters 33 17K 18K 166960K 49 0 ioctlops 0 0K 4K 166960K 353 0 iov 0 0K 16K 166960K 20 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1351 85K 85K 166960K 1677 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 24K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 85K 166960K 436 0 sigio 0 0K 0K 166960K 4 0 proc 51 50K 83K 166960K 529 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 33 0 in_multi 98 7K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 13 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 675 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 192 129K 151K 166960K 5529 0 UVM aobj 12 2K 2K 166960K 13 0 pinsyscall 31 62K 89K 166960K 1528 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 10 0 NDP 11 0K 2K 166960K 39 0 temp 75 9076K 9156K 166960K 6762 0 kqueue 12 18K 34K 166960K 70 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 67 0 64 1 0 1 1 0 8 0 rtentry 136 117 0 17 4 0 4 4 0 8 0 unpcb 144 169 0 153 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 88 0 83 1 0 1 1 0 8 0 arp 96 19 0 2 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 1 1 0 1 1 0 8 0 inpcb 328 286 0 244 4 0 4 4 0 8 0 ip6q 72 1 0 1 1 0 1 1 0 8 1 ip6af 40 2 0 2 1 0 1 1 0 8 1 nd6 112 25 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 15 0 15 1 0 1 1 0 8 1 pfstscr 40 66 0 66 1 0 1 1 0 8 1 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfsrclim 320 65 0 64 1 0 1 1 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 69 0 67 1 0 1 1 0 8 0 pfstate 384 67 0 66 1 0 1 1 0 8 0 pfrule 1360 23 0 23 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 525 0 45 31 0 31 31 0 8 1 art_table 40 527 0 45 5 0 5 5 0 8 0 art_node 32 116 0 26 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 10 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2192 0 741 92 0 92 92 0 8 0 ffsino 256 2192 0 741 92 0 92 92 0 8 0 nchpl 144 2825 0 1130 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2448 0 0 136 0 136 136 0 8 0 namei 1024 8805 0 8805 2 0 2 2 0 8 2 kstatmem 264 46 0 24 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 0 1 1 0 8 1 scxspl 216 13806 0 13806 8 0 8 8 1 8 8 plimitpl 152 70 0 56 1 0 1 1 0 8 0 sigapl 424 729 0 689 6 0 6 6 0 8 1 knotepl 120 19306 0 19263 10 0 10 10 0 8 7 kqueuepl 184 103 0 95 1 0 1 1 0 8 0 pipepl 304 134 0 107 3 0 3 3 0 8 0 fdescpl 448 715 0 690 4 0 4 4 0 8 0 filepl 120 3381 0 3141 11 0 11 11 0 8 3 lockfpl 104 255 0 251 2 0 2 2 0 8 1 lockfspl 48 54 0 51 1 0 1 1 0 8 0 sessionpl 144 37 0 30 1 0 1 1 0 8 0 pgrppl 48 52 0 37 1 0 1 1 0 8 0 ucredpl 104 472 0 461 1 0 1 1 0 8 0 zombiepl 144 692 0 689 1 0 1 1 0 8 0 processpl 1152 729 0 689 4 0 4 4 0 8 0 procpl 664 1200 0 1149 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 552 536 0 474 5 0 5 5 0 8 0 mcl64k 65536 19 0 18 1 0 1 1 0 8 0 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 1 0 1 1 0 8 1 mcl4k 4096 2949 0 2895 14 0 14 14 0 8 6 mcl2k 2048 364 0 363 4 0 4 4 0 8 3 mtagpl 96 70 0 5 2 0 2 2 0