uvm_fault(0xffffffff83a83b10, 0xffff800029ee6000, 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 *473646 84692 0 0x10 0 0 syz-executor kcov_remote_enter(0,ffff80002a793190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83969ed0,ffff80002a7365d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7365d0,0) 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: 0x7b5696d7c5a0, 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(0xffffffff83a83b10, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a793190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83969ed0,ffff80002a7365d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7365d0,0) 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: 0x7b5696d7c5a0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff800031cbd950 rbx 0xffff80002a793190 rdx 0xffff80003c9302c0 rcx 0xffff800029ee6000 rax 0xfffffd806cadec60 r8 0 r9 0 r10 0xf2be92d11e813456 r11 0xc609be0628a98090 r12 0xffffffff82450f60 endtsleep r13 0xffff80002a736538 r14 0xffff80002a793190 r15 0 rip 0xffffffff81214f42 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff800031cbd930 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=473646 pid=84692 tcnt=3 stat=onproc flags process=10 proc=0 runpri=83, usrpri=84, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c930d20,0xffff80003c930568 process=0xffff80002f0ac918 user=0xffff800031cb8000, vmspace=0xfffffd806d42aa28 estcpu=34, cpticks=9, pctcpu=0.2, user=7, sys=1, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 50297 386418 65522 0 2 0 syz-executor 50297 426096 65522 0 3 0x4000080 fsleep syz-executor 65061 98696 92242 0 2 0 syz-executor 65061 352450 92242 0 3 0x4000080 fsleep syz-executor 15470 502399 5706 0 2 0 syz-executor 15470 284755 5706 0 2 0x4000000 syz-executor 15470 481290 5706 0 2 0x4000000 syz-executor 86736 70930 23295 -1 2 0x10 syz-executor 86736 204545 23295 -1 3 0x4000090 fsleep syz-executor 67946 101655 59234 0 2 0 syz-executor 67946 138225 59234 0 3 0x4000080 fsleep syz-executor 67946 456014 59234 0 3 0x4000080 fsleep syz-executor 67946 374404 59234 0 3 0x4000080 fsleep syz-executor 32889 296058 82165 0 2 0 syz-executor 32889 329016 82165 0 3 0x4000080 fsleep syz-executor *84692 473646 10187 0 7 0x10 syz-executor 84692 160180 10187 0 2 0x4000010 syz-executor 84692 172962 10187 0 3 0x4000090 fsleep syz-executor 61478 87780 1 0 3 0x100083 ttyin getty 65012 220892 0 0 3 0x14200 acct acct 23295 89831 5812 0 3 0x82 nanoslp syz-executor 5706 235361 5812 0 3 0x82 nanoslp syz-executor 59234 84452 5812 0 3 0x82 nanoslp syz-executor 10187 173367 5812 0 3 0x82 nanoslp syz-executor 92242 441290 5812 0 3 0x82 nanoslp syz-executor 65522 332095 5812 0 3 0x82 nanoslp syz-executor 55588 410112 5812 0 3 0x82 nanoslp syz-executor 82165 5954 5812 0 3 0x82 nanoslp syz-executor 5812 69445 31653 0 3 0x82 kqread syz-executor 31653 398237 85252 0 3 0x10008a sigsusp ksh 85252 36738 8897 0 3 0x98 kqread sshd-session 8897 458937 82632 0 3 0x92 kqread sshd-session 82632 253535 1 0 3 0x88 kqread sshd 22397 149375 48897 73 3 0x1100090 kqread syslogd 48897 480031 1 0 3 0x100082 sbwait syslogd 41545 70095 1 0 3 0x100080 kqread resolvd 19449 242416 64819 77 3 0x100092 kqread dhcpleased 76943 259271 64819 77 3 0x100092 kqread dhcpleased 64819 210101 1 0 3 0x80 kqread dhcpleased 62465 403945 0 0 3 0x14200 bored smr 14566 242394 0 0 2 0x14200 zerothread 23254 235380 0 0 3 0x14200 aiodoned aiodoned 82469 338776 0 0 3 0x14200 syncer update 29269 173888 0 0 3 0x14200 cleaner cleaner 22121 402122 0 0 3 0x14200 reaper reaper 87582 210788 0 0 3 0x14200 pgdaemon pagedaemon 32903 459855 0 0 3 0x14200 bored viomb 11752 474301 0 0 3 0x40014200 acpi0 acpi0 718 179703 0 0 3 0x14200 bored softnet0 33594 473970 0 0 3 0x14200 bored systqmp 94675 6377 0 0 3 0x14200 bored systq 57626 17306 0 0 3 0x40014200 tmoslp softclock 44481 129347 0 0 3 0x40014200 idle0 1 24012 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 11039 12104K 12389K 166960K 12486 0 pcb 17 12K 12K 166960K 102 0 rtable 193 7K 7K 166960K 491 0 pf 32 13K 94K 166960K 90 0 ifaddr 33 5K 7K 166960K 58 0 ifgroup 50 2K 2K 166960K 87 0 sysctl 3 1K 9K 166960K 8 0 counters 33 17K 18K 166960K 49 0 ioctlops 0 0K 4K 166960K 145 0 iov 0 0K 16K 166960K 83 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1352 85K 85K 166960K 1724 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 96 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 572 0 sigio 0 0K 0K 166960K 1 0 proc 60 59K 83K 166960K 560 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 26 0 in_multi 68 5K 7K 166960K 115 0 ether_multi 2 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 402 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 227 143K 157K 166960K 6747 0 UVM aobj 19 2K 2K 166960K 20 0 pinsyscall 39 78K 88K 166960K 1676 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 11 0 NDP 11 0K 2K 166960K 37 0 temp 45 9104K 9170K 166960K 15759 0 kqueue 14 22K 30K 166960K 119 0 SYN cache 2 16K 24K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 61 0 56 1 0 1 1 0 8 0 rtentry 136 120 0 41 4 0 4 4 0 8 0 unpcb 144 288 0 272 4 0 4 4 0 8 3 syncache 336 7 0 7 2 1 1 1 0 8 1 tcpcb 736 160 0 154 8 6 2 7 0 8 1 arp 96 19 0 7 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 0 1 0 1 1 0 8 0 inpcb 328 573 0 561 15 8 7 10 0 8 5 ip6q 72 6 0 2 1 0 1 1 0 8 0 ip6af 40 9 0 4 1 0 1 1 0 8 0 nd6 112 25 0 9 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 10 0 10 2 1 1 1 0 8 1 pppxif 1416 2 0 2 1 1 0 1 0 8 0 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfrule 1360 11 0 10 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 506 0 184 30 1 29 30 0 8 5 art_table 40 508 0 184 5 0 5 5 0 8 0 art_node 32 120 0 50 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 64 92 0 82 1 0 1 1 0 8 0 shmpl 112 17 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2310 0 852 92 0 92 92 0 8 0 ffsino 256 2310 0 852 92 0 92 92 0 8 0 nchpl 144 3143 0 1441 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 2630 0 0 147 0 147 147 0 8 0 namei 1024 9617 0 9616 2 0 2 2 0 8 1 kstatmem 264 43 0 20 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 16154 0 16154 8 7 1 8 1 8 1 plimitpl 152 159 0 140 1 0 1 1 0 8 0 sigapl 424 860 0 816 6 1 5 6 0 8 0 knotepl 120 20375 0 20323 37 28 9 25 0 8 7 kqueuepl 184 189 0 179 3 2 1 3 0 8 0 pipepl 304 151 0 124 3 0 3 3 0 8 0 fdescpl 448 846 0 816 4 0 4 4 0 8 0 filepl 120 4044 0 3821 10 0 10 10 0 8 2 lockfpl 104 300 0 298 2 0 2 2 0 8 1 lockfspl 48 141 0 139 1 0 1 1 0 8 0 sessionpl 144 38 0 30 1 0 1 1 0 8 0 pgrppl 48 46 0 30 1 0 1 1 0 8 0 ucredpl 104 545 0 530 1 0 1 1 0 8 0 zombiepl 144 971 0 970 1 0 1 1 0 8 0 processpl 1152 860 0 816 4 0 4 4 0 8 0 procpl 664 1511 0 1455 6 0 6 6 0 8 0 sockpl 552 935 0 902 12 2 10 10 0 8 7 mcl64k 65536 22 0 22 2 1 1 1 0 8 1 mcl16k 16384 4 0 4 1 1 0 1 0 8 0 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k128 9344 2 0 2 2 1 1 1 0 8 1 mcl8k 8192 14 0 14 2 1 1 1 0 8 1 mcl4k 4096 3138 0 3082 14 6 8 14 0 8 0 mcl2k 2048 456 0 454 3 0 3 3 0 8 2 mtagpl 96 11 0 8 2 1 1 1 0 8 0 mbufpl 256 8452 0 8296 19 0 19 19 0 8 5 bufpl 280 6128 0 105 431 0 431 431 0 8 0 anonpl 24 125928 0 122695 76 2 74 74 0 186 35 amapchunkpl 152 21541 0 21043 34 5 29 29 0 158 9 amappl16 200 1945 0 1916 27 14 13 27 0 8 8 amappl14 184 415 0 414 1 0 1 1 0 8 0 amappl13 176 114 0 104 1 0 1 1 0 8 0 amappl12 168 1094 0 1065 2 0 2 2 0 8 0 amappl11 160 17 0 17 1 1 0 1 0 8 0 amappl10 152 56 0 46 1 0 1 1 0 8 0 amappl9 144 278 0 277 1 0 1 1 0 8 0 amappl8 136 99 0 98 1 0 1 1 0 8 0 amappl7 128 176 0 165 1 0 1 1 0 8 0 amappl6 120 187 0 186 1 0 1 1 0 8 0 amappl5 112 91 0 83 1 0 1 1 0 8 0 amappl4 104 268 0 248 1 0 1 1 0 8 0 amappl3 96 4361 0 4246 5 1 4 4 0 8 0 amappl2 88 533 0 477 2 0 2 2 0 8 0 amappl1 80 11880 0 11328 12 0 12 12 0 8 0 amappl 88 5976 0 5810 4 0 4 4 0 92 0 uvmvnodes 80 112 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 19 0 1 1 0 1 1 0 8 0 uaddrrnd 24 846 0 816 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 846 0 816 1 0 1 1 0 8 0 vmmpekpl 168 8290 0 8262 2 0 2 2 0 8 0 vmmpepl 168 60688 0 58847 102 0 102 102 0 357 20 vmsppl 368 845 0 816 4 1 3 4 0 8 0 rwobjpl 40 18651 0 17665 15 0 15 15 0 8 0 pdppl 4096 1698 0 1632 96 30 66 74 0 8 0 pvpl 32 362585 0 353711 151 1 150 150 0 265 50 pmappl 216 845 0 816 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 380 0 50 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a793190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83969ed0,ffff80002a7365d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7365d0,0) 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: 0x7b5696d7c5a0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a793190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83969ed0,ffff80002a7365d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7365d0,0) 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: 0x7b5696d7c5a0, count: -7