uvm_fault(0xffffffff839a8090, 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 *369374 17764 0 0 0 0 syz-executor kcov_remote_enter(0,ffff8000ffff9218) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ab90,ffff8000300b1d38) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff8000300b1d38,0) 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: 0x78a0d19193d0, 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(0xffffffff839a8090, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff8000ffff9218) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ab90,ffff8000300b1d38) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff8000300b1d38,0) 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: 0x78a0d19193d0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002ccc1a90 rbx 0xffff8000ffff9218 rdx 0xffff8000300b07e0 rcx 0xffff800029ee6000 rax 0xfffffd806cacbe70 r8 0 r9 0 r10 0xc63cdbde4fca266c r11 0x272103d9f5ef36eb r12 0xffffffff830dc6c0 endtsleep r13 0xffff8000300b1ca0 r14 0xffff8000ffff9218 r15 0 rip 0xffffffff81edf062 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002ccc1a70 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=369374 pid=17764 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=0xffff80002a789780,0xffff8000300b1780 process=0xffff8000ffff8498 user=0xffff80002ccbc000, vmspace=0xfffffd80711608a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *17764 369374 50052 0 7 0 syz-executor 17764 186762 50052 0 2 0x4000000 syz-executor 79359 117148 87169 0 2 0 syz-executor 79359 364878 87169 0 3 0x4000080 fsleep syz-executor 53603 146683 7686 0 2 0 syz-executor 53603 164107 7686 0 3 0x4000080 fsleep syz-executor 53603 135880 7686 0 2 0x4000000 syz-executor 66517 86423 62716 60928 2 0x10 syz-executor 66517 236445 62716 60928 3 0x4000090 fsleep syz-executor 64567 235540 6495 0 2 0xc80 syz-executor 64567 165615 6495 0 3 0x4000080 ttyout syz-executor 64567 344625 6495 0 3 0x4000080 fsleep syz-executor 3654 454478 0 0 3 0x14200 acct acct 50052 510259 76771 0 3 0x82 nanoslp syz-executor 7686 129508 76771 0 3 0x82 nanoslp syz-executor 50395 80741 1 0 3 0x100083 ttyin getty 6495 467743 76771 0 3 0x82 nanoslp syz-executor 73499 344799 76771 0 3 0x82 piperd syz-executor 17628 22584 76771 0 3 0x82 piperd syz-executor 87169 284230 76771 0 3 0x82 nanoslp syz-executor 62716 54013 76771 0 3 0x82 nanoslp syz-executor 28143 167753 76771 0 3 0x82 piperd syz-executor 76771 153735 6042 0 2 0x2 syz-executor 6042 89317 59461 0 3 0x10008a sigsusp ksh 59461 243863 37250 0 3 0x98 kqread sshd-session 37250 383621 4467 0 3 0x92 kqread sshd-session 4467 97483 1 0 3 0x88 kqread sshd 35746 91078 16361 73 2 0x1100090 syslogd 16361 218559 1 0 3 0x100082 sbwait syslogd 16713 312540 1 0 3 0x100080 kqread resolvd 43276 6188 53930 77 3 0x100092 kqread dhcpleased 51649 318579 53930 77 3 0x100092 kqread dhcpleased 53930 497946 1 0 3 0x80 kqread dhcpleased 25931 169913 0 0 3 0x14200 bored smr 48922 19387 0 0 2 0x14200 zerothread 20086 118762 0 0 3 0x14200 aiodoned aiodoned 39337 471123 0 0 3 0x14200 syncer update 55472 360561 0 0 3 0x14200 cleaner cleaner 15672 143421 0 0 3 0x14200 reaper reaper 52694 221012 0 0 3 0x14200 pgdaemon pagedaemon 74606 106347 0 0 3 0x14200 bored viomb 40305 153914 0 0 3 0x40014200 acpi0 acpi0 99297 30988 0 0 3 0x14200 bored softnet0 47097 198564 0 0 3 0x14200 smrbar systqmp 68370 364837 0 0 3 0x14200 bored systq 83420 229736 0 0 3 0x40014200 tmoslp softclock 60629 385443 0 0 3 0x40014200 idle0 1 233184 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11046 12169K 12771K 166960K 13362 0 pcb 17 12K 12K 166960K 226 0 rtable 147 13K 16K 166960K 603 0 pf 38 15K 96K 166960K 250 0 ifaddr 31 5K 8K 166960K 113 0 ifgroup 49 2K 2K 166960K 184 0 sysctl 3 1K 9K 166960K 10 0 counters 32 17K 18K 166960K 95 0 ioctlops 0 0K 4K 166960K 225 0 iov 0 0K 16K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1292 81K 82K 166960K 2252 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 15 3K 3K 166960K 27 0 dirhash 12 2K 3K 166960K 57 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 93K 166960K 1869 0 sigio 0 0K 0K 166960K 28 0 proc 60 59K 116K 166960K 665 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 93 0 in_multi 58 4K 7K 166960K 205 0 ether_multi 1 0K 0K 166960K 33 0 mrt 1 0K 0K 166960K 60 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 1K 166960K 487 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 198 150K 164K 166960K 16513 0 UVM aobj 9 2K 2K 166960K 10 0 pinsyscall 36 72K 95K 166960K 3065 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 57 0 NDP 11 0K 2K 166960K 78 0 temp 60 9108K 9217K 166960K 46063 0 kqueue 14 22K 30K 166960K 278 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 65 0 62 1 0 1 1 0 8 0 rtentry 136 176 0 120 4 0 4 4 0 8 0 unpcb 144 419 0 404 1 0 1 1 0 8 0 syncache 336 15 0 15 2 1 1 1 0 8 1 tcpcb 736 193 0 189 1 0 1 1 0 8 0 arp 96 26 0 14 1 0 1 1 0 8 0 ipq 40 7 0 2 1 0 1 1 0 8 0 ipqe 40 15 0 6 1 0 1 1 0 8 0 inpcb 328 683 0 674 3 1 2 2 0 8 1 ip6q 72 5 0 2 1 0 1 1 0 8 0 ip6af 40 7 0 4 1 0 1 1 0 8 0 nd6 112 35 0 24 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 mppekey 1024 3 0 3 1 0 1 1 0 8 1 ppxss 1072 45 0 45 2 1 1 1 0 8 1 pppxif 1416 8 0 8 1 0 1 1 0 8 1 pfstscr 40 35 0 29 1 0 1 1 0 8 0 pfrktable 1344 21 0 21 1 0 1 1 0 8 1 pfsrclim 320 3 0 3 1 1 0 1 0 8 0 pfanchor 1288 10 0 5 1 0 1 1 0 8 0 pftag 88 10 0 4 1 0 1 1 0 8 0 pfqueue 320 2 0 2 1 0 1 1 0 8 1 pfstitem 24 11 0 1 1 0 1 1 0 8 0 pfstkey 128 42 0 33 1 0 1 1 0 8 0 pfstate 384 23 0 17 1 0 1 1 0 8 0 pfrule 1360 36 0 35 1 0 1 1 0 8 0 rttmr 136 10 0 10 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 886 0 527 33 4 29 30 0 8 6 art_table 40 887 0 527 5 0 5 5 0 8 0 art_node 32 176 0 115 1 0 1 1 0 8 0 sysvmsgpl 40 23 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 64 20 0 7 1 0 1 1 0 8 0 shmpl 112 7 0 1 1 0 1 1 0 8 0 dirhash 1024 47 0 30 3 0 3 3 0 8 0 dino2pl 256 4336 0 2873 92 0 92 92 0 8 0 ffsino 256 4336 0 2873 92 0 92 92 0 8 0 nchpl 144 6419 0 4725 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 0 1 1 0 8 1 vnodes 216 4839 0 0 269 0 269 269 0 8 0 namei 1024 17487 0 17487 3 2 1 2 0 8 1 pfiaddrpl 120 4 0 4 1 0 1 1 0 8 1 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 kstatmem 264 109 0 88 2 0 2 2 0 8 0 scsiplug 72 9 0 9 2 1 1 1 0 8 1 scxspl 216 23945 0 23945 10 2 8 8 1 8 8 plimitpl 152 224 0 207 1 0 1 1 0 8 0 sigapl 424 2165 0 2124 7 1 6 6 0 8 0 knotepl 120 61703 0 61651 51 41 10 24 0 8 8 kqueuepl 184 297 0 287 1 0 1 1 0 8 0 pipepl 304 155 0 127 3 0 3 3 0 8 0 fdescpl 448 2150 0 2123 5 1 4 5 0 8 0 filepl 120 6664 0 6451 7 0 7 7 0 8 0 lockfpl 104 384 0 382 1 0 1 1 0 8 0 lockfspl 48 155 0 153 1 0 1 1 0 8 0 sessionpl 144 69 0 61 1 0 1 1 0 8 0 pgrppl 48 84 0 68 1 0 1 1 0 8 0 ucredpl 104 1565 0 1553 1 0 1 1 0 8 0 zombiepl 144 2124 0 2124 2 1 1 1 0 8 1 processpl 1152 2165 0 2124 4 0 4 4 0 8 0 procpl 664 4109 0 4061 6 0 6 6 0 8 0 sosppl 176 3 0 3 1 0 1 1 0 8 1 sockpl 552 1185 0 1158 3 0 3 3 0 8 0 mcl64k 65536 470 0 469 1 0 1 1 0 8 0 mcl16k 16384 298 0 298 2 1 1 1 0 8 1 mcl12k 12288 194 0 194 2 1 1 1 0 8 1 mcl9k128 9344 71 0 71 2 1 1 1 0 8 1 mcl8k 8192 220 0 220 2 1 1 1 0 8 1 mcl4k 4096 5615 0 5563 16 8 8 15 0 8 1 mcl2k2 2112 3 0 3 2 1 1 1 0 8 1 mcl2k 2048 704 0 697 3 1 2 2 0 8 1 mtagpl 96 21 0 13 1 0 1 1 0 8 0 mbufpl 256 23147 0 22963 22 5 17 21 0 8 0 bufpl 280 7031 0 815 445 0 445 445 0 8 0 anonpl 24 264891 0 261869 45 0 45 45 0 186 9 amapchunkpl 152 56657 0 56265 33 7 26 27 0 158 6 amappl16 200 4899 0 4866 23 9 14 20 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 449 0 447 1 0 1 1 0 8 0 amappl13 176 130 0 119 1 0 1 1 0 8 0 amappl12 168 2406 0 2379 2 0 2 2 0 8 0 amappl11 160 35 0 35 1 1 0 1 0 8 0 amappl10 152 60 0 50 1 0 1 1 0 8 0 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 110 0 109 1 0 1 1 0 8 0 amappl7 128 151 0 140 1 0 1 1 0 8 0 amappl6 120 181 0 180 1 0 1 1 0 8 0 amappl5 112 89 0 82 1 0 1 1 0 8 0 amappl4 104 359 0 344 1 0 1 1 0 8 0 amappl3 96 12267 0 12174 4 0 4 4 0 8 0 amappl2 88 579 0 525 2 0 2 2 0 8 0 amappl1 80 17452 0 16917 13 1 12 13 0 8 0 amappl 88 15684 0 15548 4 0 4 4 0 92 0 uvmvnodes 80 136 0 0 3 0 3 3 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 5 0 5 2 1 1 1 0 8 1 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 128 258 0 258 2 1 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 1 1 0 1 0 8 0 dma16 16 22 0 21 1 0 1 1 0 8 0 aobjpl 72 9 0 1 1 0 1 1 0 8 0 uaddrrnd 24 2150 0 2123 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2150 0 2123 1 0 1 1 0 8 0 vmmpekpl 168 15476 0 15432 3 0 3 3 0 8 0 vmmpepl 168 135643 0 133972 94 4 90 94 0 357 9 vmsppl 368 2149 0 2123 4 1 3 4 0 8 0 rwobjpl 40 33266 0 32307 13 0 13 13 0 8 0 pdppl 4096 4306 0 4246 100 34 66 80 0 8 6 pvpl 32 968142 0 959775 130 7 123 125 0 265 27 pmappl 216 2149 0 2123 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 390 0 63 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff8000ffff9218) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ab90,ffff8000300b1d38) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff8000300b1d38,0) 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: 0x78a0d19193d0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff8000ffff9218) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ab90,ffff8000300b1d38) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff8000300b1d38,0) 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: 0x78a0d19193d0, count: -7