uvm_fault(0xffffffff83a1e4e0, 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 *422719 70274 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7ac010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838a9e40,ffff80002a7760a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7760a8,0) 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: 0x76cd623bc170, 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(0xffffffff83a1e4e0, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7ac010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838a9e40,ffff80002a7760a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7760a8,0) 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: 0x76cd623bc170, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff8000304df4a0 rbx 0xffff80002a7ac010 rdx 0xffff80003c929250 rcx 0xffff800029ef6000 rax 0xfffffd806cb39f60 r8 0 r9 0 r10 0x230fb1ffa6d6854f r11 0x42c2352e5465a408 r12 0xffffffff819a2b90 endtsleep r13 0xffff80002a776010 r14 0xffff80002a7ac010 r15 0 rip 0xffffffff81dda402 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff8000304df480 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=422719 pid=70274 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f0bbca8,0xffff80003c929790 process=0xffff80003c981fa0 user=0xffff8000304da000, vmspace=0xfffffd8073165e78 estcpu=36, cpticks=5, pctcpu=0.0, user=4, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 33619 429340 42940 0 2 0 syz-executor 33619 247827 42940 0 3 0x4000000 smrbar syz-executor 55138 499876 0 0 3 0x14200 acct acct 47280 225822 95915 0 2 0 syz-executor 47280 424487 95915 0 3 0x4000080 sbwait syz-executor *70274 422719 45006 0 7 0 syz-executor 70274 522210 45006 0 3 0x4000080 ttyin syz-executor 70274 220637 45006 0 2 0x4000000 syz-executor 31173 275632 0 0 3 0x14280 nfsidl nfsio 66709 159819 0 0 3 0x14280 nfsidl nfsio 64204 426006 0 0 3 0x14280 nfsidl nfsio 87093 44374 0 0 3 0x14280 nfsidl nfsio 33725 399522 0 0 3 0x14280 nfsidl nfsio 89871 170611 0 0 3 0x14280 nfsidl nfsio 23877 119659 0 0 3 0x14280 nfsidl nfsio 71950 338955 0 0 3 0x14280 nfsidl nfsio 47038 418823 0 0 3 0x14280 nfsidl nfsio 37418 522015 0 0 3 0x14280 nfsidl nfsio 43819 479739 0 0 3 0x14280 nfsidl nfsio 20640 232353 0 0 3 0x14280 nfsidl nfsio 5155 230466 0 0 3 0x14280 nfsidl nfsio 41505 218617 0 0 3 0x14280 nfsidl nfsio 89106 4546 0 0 3 0x14280 nfsidl nfsio 88358 273532 0 0 3 0x14280 nfsidl nfsio 27179 464476 0 0 3 0x14280 nfsidl nfsio 57587 468946 0 0 3 0x14280 nfsidl nfsio 56107 141855 0 0 3 0x14280 nfsidl nfsio 21534 80864 0 0 3 0x14280 nfsidl nfsio 42940 447028 83263 0 3 0x82 nanoslp syz-executor 44660 227703 83263 0 3 0x82 piperd syz-executor 34557 92556 83263 0 3 0x82 piperd syz-executor 95915 228281 83263 0 3 0x82 nanoslp syz-executor 45006 199505 83263 0 3 0x82 nanoslp syz-executor 83263 280919 37596 0 3 0x82 nanoslp syz-executor 37596 43312 65753 0 3 0x10008a sigsusp ksh 65753 56110 2620 0 3 0x98 kqread sshd-session 2620 213385 57791 0 3 0x92 kqread sshd-session 79017 178720 1 0 3 0x100083 ttyin getty 57791 496584 1 0 3 0x88 kqread sshd 45238 371238 35596 73 3 0x1100090 kqread syslogd 35596 425151 1 0 3 0x100082 sbwait syslogd 72674 95807 1 0 3 0x100080 kqread resolvd 48730 132884 39827 77 3 0x100092 kqread dhcpleased 27122 130747 39827 77 3 0x100092 kqread dhcpleased 39827 402872 1 0 3 0x80 kqread dhcpleased 65387 354558 0 0 3 0x14200 bored smr 12320 300095 0 0 2 0x14200 zerothread 10082 194659 0 0 3 0x14200 aiodoned aiodoned 55109 298084 0 0 3 0x14200 syncer update 30461 249707 0 0 3 0x14200 cleaner cleaner 8145 471157 0 0 3 0x14200 reaper reaper 7118 417345 0 0 3 0x14200 pgdaemon pagedaemon 75336 352680 0 0 3 0x14200 bored viomb 99978 463163 0 0 3 0x40014200 acpi0 acpi0 48445 65386 0 0 3 0x14200 bored softnet0 72022 54163 0 0 3 0x14200 bored systqmp 39348 430709 0 0 3 0x14200 bored systq 21558 256127 0 0 3 0x40014200 tmoslp softclock 64183 161138 0 0 3 0x40014200 idle0 1 478724 0 0 3 0x82 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 11040 12308K 13185K 166960K 13210 0 pcb 17 16K 18K 166960K 156 0 rtable 162 5K 10K 166960K 496 0 pf 29 13K 21K 166960K 153 0 ifaddr 29 5K 7K 166960K 61 0 ifgroup 38 1K 2K 166960K 82 0 sysctl 4 1K 9K 166960K 10 0 counters 30 17K 17K 166960K 49 0 ioctlops 0 0K 4K 166960K 183 0 iov 0 0K 24K 166960K 62 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1427 90K 90K 166960K 2319 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 29 0 dirhash 12 2K 3K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 12 41K 106K 166960K 653 0 sigio 1 0K 0K 166960K 10 0 proc 60 59K 91K 166960K 538 0 subproc 63 3K 5K 166960K 171 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 68 0 in_multi 62 4K 7K 166960K 115 0 ether_multi 1 0K 0K 166960K 3 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 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 422 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 171 141K 167K 166960K 7201 0 UVM aobj 24 2K 2K 166960K 26 0 pinsyscall 33 66K 94K 166960K 1727 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 8 0K 2K 166960K 39 0 temp 43 9069K 9133K 166960K 20059 0 kqueue 13 20K 30K 166960K 107 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 120 196 0 193 3 0 3 3 0 8 2 rtentry 136 132 0 65 4 0 4 4 0 8 0 unpcb 144 280 0 261 2 0 2 2 0 8 1 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 239 0 235 13 4 9 13 0 8 8 arp 96 18 0 6 1 0 1 1 0 8 0 ipq 40 5 0 0 1 0 1 1 0 8 0 ipqe 40 6 0 0 1 0 1 1 0 8 0 inpcb 328 726 0 718 15 6 9 15 0 8 8 ip6q 72 6 0 0 1 0 1 1 0 8 0 ip6af 40 5 0 0 1 0 1 1 0 8 0 nd6 112 34 0 18 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 19 0 12 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 13 0 13 1 0 1 1 0 8 1 pppxif 1416 1 0 1 1 0 1 1 0 8 1 pfstscr 40 10 0 7 1 0 1 1 0 8 0 pfrktable 1344 33 0 33 1 0 1 1 0 8 1 pfanchor 1288 14 0 10 1 0 1 1 0 8 0 pftag 88 6 0 5 1 0 1 1 0 8 0 pfstitem 24 7 0 2 1 0 1 1 0 8 0 pfstkey 128 12 0 6 1 0 1 1 0 8 0 pfstate 384 7 0 4 1 0 1 1 0 8 0 pfrule 1360 10 0 10 1 0 1 1 0 8 1 rttmr 136 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 583 0 268 30 0 30 30 0 8 6 art_table 40 585 0 268 5 0 5 5 0 8 0 art_node 32 130 0 70 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semapl 112 25 0 15 1 0 1 1 0 8 0 shmpl 112 23 0 2 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2666 0 1205 92 0 92 92 0 8 0 ffsino 256 2666 0 1205 92 0 92 92 0 8 0 nchpl 144 3510 0 1808 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 3340 0 0 186 0 186 186 0 8 0 namei 1024 12101 0 12101 2 0 2 2 0 8 2 pfiaddrpl 120 10 0 10 1 0 1 1 0 8 1 kstatmem 264 47 0 30 2 0 2 2 0 8 0 scxspl 216 14819 0 14819 8 0 8 8 1 8 8 plimitpl 152 130 0 115 1 0 1 1 0 8 0 sigapl 424 937 0 879 8 0 8 8 0 8 0 knotepl 120 21670 0 21623 15 5 10 15 0 8 8 kqueuepl 184 330 0 321 7 0 7 7 0 8 6 pipepl 304 181 0 154 3 0 3 3 0 8 0 fdescpl 448 901 0 877 5 0 5 5 0 8 1 filepl 120 6105 0 5906 18 3 15 18 0 8 8 lockfpl 104 208 0 206 1 0 1 1 0 8 0 lockfspl 48 92 0 90 1 0 1 1 0 8 0 sessionpl 144 86 0 78 1 0 1 1 0 8 0 pgrppl 48 173 0 158 1 0 1 1 0 8 0 ucredpl 104 1217 0 1206 1 0 1 1 0 8 0 zombiepl 144 881 0 879 1 0 1 1 0 8 0 processpl 1152 937 0 879 5 0 5 5 0 8 0 procpl 664 1687 0 1625 7 0 7 7 0 8 0 sosppl 176 6 0 6 1 0 1 1 0 8 1 sockpl 552 1223 0 1193 14 4 10 14 0 8 7 mcl64k 65536 82 0 80 1 0 1 1 0 8 0 mcl9k128 9344 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 14 0 14 1 0 1 1 0 8 1 mcl4k 4096 3159 0 3105 14 0 14 14 0 8 5 mcl2k 2048 598 0 596 3 0 3 3 0 8 2 mtagpl 96 48 0 12 2 0 2 2 0 8 0 mbufpl 256 9601 0 9448 27 4 23 25 0 8 8 bufpl 280 7411 0 1197 444 0 444 444 0 8 0 anonpl 24 177389 0 174607 57 0 57 57 0 187 24 amapchunkpl 152 23928 0 23618 36 0 36 36 0 158 18 amappl16 200 4047 0 4025 25 12 13 15 0 8 8 amappl15 192 58 0 58 1 0 1 1 0 8 1 amappl14 184 411 0 410 1 0 1 1 0 8 0 amappl13 176 112 0 102 1 0 1 1 0 8 0 amappl12 168 1152 0 1128 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 0 1 1 0 8 1 amappl10 152 58 0 48 1 0 1 1 0 8 0 amappl9 144 263 0 262 1 0 1 1 0 8 0 amappl8 136 104 0 103 1 0 1 1 0 8 0 amappl7 128 142 0 130 1 0 1 1 0 8 0 amappl6 120 165 0 164 1 0 1 1 0 8 0 amappl5 112 87 0 79 1 0 1 1 0 8 0 amappl4 104 254 0 236 1 0 1 1 0 8 0 amappl3 96 4625 0 4551 4 0 4 4 0 8 1 amappl2 88 503 0 447 2 0 2 2 0 8 0 amappl1 80 11271 0 10738 13 0 13 13 0 8 1 amappl 88 6430 0 6320 5 0 5 5 0 92 0 uvmvnodes 80 106 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 7 0 7 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 25 0 2 1 0 1 1 0 8 0 uaddrrnd 24 901 0 877 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 901 0 877 1 0 1 1 0 8 0 vmmpekpl 168 8766 0 8724 3 0 3 3 0 8 0 vmmpepl 168 64701 0 63191 91 0 91 91 0 357 18 vmsppl 368 900 0 877 4 0 4 4 0 8 1 rwobjpl 40 20484 0 19581 13 0 13 13 0 8 0 pdppl 4096 1808 0 1754 100 36 64 80 0 8 10 pvpl 32 431229 0 423892 130 0 130 130 0 265 38 pmappl 216 900 0 877 3 0 3 3 0 8 1 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 395 0 44 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7ac010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838a9e40,ffff80002a7760a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7760a8,0) 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: 0x76cd623bc170, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7ac010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838a9e40,ffff80002a7760a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7760a8,0) 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: 0x76cd623bc170, count: -7