uvm_fault(0xffffffff8396e8e0, 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 *376636 95366 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7a2d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838befe0,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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: 0x75a80736afd0, 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(0xffffffff8396e8e0, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7a2d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838befe0,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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: 0x75a80736afd0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003a4eda40 rbx 0xffff80002a7a2d10 rdx 0xffff80002f0c14d8 rcx 0xffff800029ef6000 rax 0xfffffd806cd27cf0 r8 0 r9 0 r10 0x3885e7c3b828a9f3 r11 0xee8ef98470de2ac6 r12 0xffffffff83260be0 endtsleep r13 0xffff80002a747230 r14 0xffff80002a7a2d10 r15 0 rip 0xffffffff82b7dae2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003a4eda20 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=376636 pid=95366 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=0xffff8000324cc550,0xffff80002f0c0558 process=0xffff8000324ca418 user=0xffff80003a4e8000, vmspace=0xfffffd806f688e68 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 17793 168639 13261 0 2 0x2 sshd-auth 36006 397495 65808 0 2 0 syz-executor 36006 317602 65808 0 2 0x4000000 syz-executor *95366 376636 89413 0 7 0 syz-executor 95366 61726 89413 0 3 0x4000080 ttyretype syz-executor 13261 201046 85490 0 3 0x82 kqread sshd-session 4429 290808 51039 0 2 0 syz-executor 4429 35848 51039 0 3 0x4000080 fifor syz-executor 48850 209117 68443 0 2 0 syz-executor 48850 277299 68443 0 3 0x4000080 fsleep syz-executor 48850 64278 68443 0 3 0x4000000 fltagain2 syz-executor 48850 376309 68443 0 2 0x4000000 syz-executor 63167 511440 23442 0 2 0 syz-executor 63167 58149 23442 0 3 0x4000080 fsleep syz-executor 63167 368678 23442 0 3 0x4000080 fsleep syz-executor 63167 193827 23442 0 3 0x4000080 fsleep syz-executor 63167 374151 23442 0 3 0x4000080 fsleep syz-executor 63167 520950 23442 0 3 0x4000080 fsleep syz-executor 72859 50038 69914 0 2 0 syz-executor 72859 287009 69914 0 3 0x4000080 fsleep syz-executor 85142 180560 94115 0 2 0 syz-executor 85142 257063 94115 0 3 0x4000080 ttyout syz-executor 85142 353182 94115 0 3 0x4000080 fsleep syz-executor 88658 142697 0 0 3 0x14200 acct acct 78975 487733 1 0 3 0x100083 ttyopn getty 89413 501393 34678 0 3 0x82 nanoslp syz-executor 94115 296879 34678 0 3 0x82 nanoslp syz-executor 68443 253221 34678 0 3 0x82 nanoslp syz-executor 23442 388109 34678 0 3 0x82 nanoslp syz-executor 69914 120687 34678 0 3 0x82 nanoslp syz-executor 65808 283590 34678 0 3 0x82 nanoslp syz-executor 817 328775 34678 0 2 0x2 syz-executor 51039 356818 34678 0 3 0x82 nanoslp syz-executor 34678 54562 66996 0 3 0x82 kqread syz-executor 66996 454065 54034 0 3 0x10008a sigsusp ksh 54034 239966 47104 0 3 0x98 kqread sshd-session 47104 251665 85490 0 3 0x92 kqread sshd-session 85490 188170 1 0 3 0x88 kqread sshd 65657 156542 38820 73 3 0x1100090 kqread syslogd 38820 209158 1 0 3 0x100082 sbwait syslogd 55870 358375 1 0 3 0x100080 kqread resolvd 66450 336730 30368 77 3 0x100092 kqread dhcpleased 28597 510413 30368 77 3 0x100092 kqread dhcpleased 30368 54057 1 0 3 0x80 kqread dhcpleased 23540 377041 0 0 3 0x14200 bored smr 82546 118792 0 0 2 0x14200 zerothread 92265 426759 0 0 3 0x14200 aiodoned aiodoned 47269 262995 0 0 3 0x14200 syncer update 80043 502050 0 0 3 0x14200 cleaner cleaner 54889 132449 0 0 3 0x14200 reaper reaper 60392 375898 0 0 3 0x14200 pgdaemon pagedaemon 10523 347631 0 0 3 0x14200 bored viomb 78983 394180 0 0 3 0x40014200 acpi0 acpi0 48894 420149 0 0 3 0x14200 bored softnet0 92250 335195 0 0 3 0x14200 smrbar systqmp 96635 226809 0 0 3 0x14200 bored systq 37145 220406 0 0 3 0x40014200 tmoslp softclock 45078 356528 0 0 3 0x40014200 idle0 1 152447 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 11053 12364K 12573K 166960K 14119 0 pcb 17 12K 12K 166960K 179 0 rtable 148 14K 15K 166960K 536 0 pf 29 13K 15K 166960K 134 0 ifaddr 27 4K 7K 166960K 101 0 ifgroup 42 1K 2K 166960K 173 0 sysctl 4 1K 9K 166960K 10 0 counters 31 17K 18K 166960K 83 0 ioctlops 1 2K 4K 166960K 151 0 iov 0 0K 16K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1286 81K 82K 166960K 2352 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 16 0K 0K 166960K 33 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 2219 0 sigio 0 0K 0K 166960K 18 0 proc 60 59K 100K 166960K 652 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 115 0 in_multi 47 3K 7K 166960K 196 0 ether_multi 1 0K 0K 166960K 24 0 mrt 1 0K 0K 166960K 39 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 501 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 240 159K 169K 166960K 19445 0 UVM aobj 8 2K 2K 166960K 8 0 pinsyscall 41 82K 93K 166960K 3382 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 60 0 NDP 9 0K 2K 166960K 67 0 temp 61 9071K 9138K 166960K 43610 0 kqueue 15 24K 30K 166960K 293 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 72 0 69 1 0 1 1 0 8 0 rtentry 136 158 0 106 4 0 4 4 0 8 0 unpcb 144 519 0 498 1 0 1 1 0 8 0 syncache 336 8 0 8 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 240 0 233 1 0 1 1 0 8 0 arp 96 24 0 15 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 4 0 0 1 0 1 1 0 8 0 inpcb 328 682 0 670 2 0 2 2 0 8 0 ip6q 72 3 0 0 1 0 1 1 0 8 0 ip6af 40 3 0 0 1 0 1 1 0 8 0 nd6 112 28 0 19 1 0 1 1 0 8 0 pkpcb 40 8 0 8 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 32 0 32 1 0 1 1 0 8 1 pppxif 1416 10 0 10 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pfrktable 1344 6 0 3 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 6 0 4 1 0 1 1 0 8 0 pfstate 384 3 0 2 1 0 1 1 0 8 0 pfrule 1360 5 0 3 1 0 1 1 0 8 0 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 256 650 0 382 29 1 28 29 0 8 8 art_table 40 652 0 382 5 0 5 5 0 8 0 art_node 32 157 0 104 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 9 1 0 1 1 0 8 0 semupl 112 3 0 3 1 0 1 1 0 8 1 semapl 112 26 0 12 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 4811 0 3359 92 0 92 92 0 8 0 ffsino 256 4811 0 3359 92 0 92 92 0 8 0 nchpl 144 7405 0 5705 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 5391 0 0 300 0 300 300 0 8 0 namei 1024 19537 0 19537 2 0 2 2 0 8 2 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 94 0 76 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 11 0 11 1 0 1 1 0 8 1 scxspl 216 29221 0 29221 8 0 8 8 1 8 8 plimitpl 152 224 0 204 1 0 1 1 0 8 0 sigapl 424 2522 0 2477 6 0 6 6 0 8 0 knotepl 120 77006 0 76949 23 13 10 17 0 8 8 kqueuepl 184 294 0 283 1 0 1 1 0 8 0 pipepl 304 150 0 121 3 0 3 3 0 8 0 fdescpl 448 2506 0 2475 5 0 5 5 0 8 1 filepl 120 7511 0 7280 8 0 8 8 0 8 0 lockfpl 104 556 0 554 1 0 1 1 0 8 0 lockfspl 48 240 0 238 1 0 1 1 0 8 0 sessionpl 144 67 0 58 1 0 1 1 0 8 0 pgrppl 48 77 0 60 1 0 1 1 0 8 0 ucredpl 104 1737 0 1726 1 0 1 1 0 8 0 zombiepl 144 2477 0 2477 1 0 1 1 0 8 1 processpl 1152 2522 0 2477 4 0 4 4 0 8 0 procpl 664 4871 0 4812 6 0 6 6 0 8 0 sockpl 552 1290 0 1254 3 0 3 3 0 8 0 mcl64k 65536 607 0 607 1 0 1 1 0 8 1 mcl16k 16384 396 0 396 1 0 1 1 0 8 1 mcl12k 12288 271 0 271 1 0 1 1 0 8 1 mcl9k 9216 119 0 119 1 0 1 1 0 8 1 mcl8k 8192 335 0 335 1 0 1 1 0 8 1 mcl4k 4096 6466 0 6414 14 0 14 14 0 8 7 mcl2k2 2112 3 0 3 1 0 1 1 0 8 1 mcl2k 2048 642 0 641 2 0 2 2 0 8 1 mtagpl 96 61 0 23 2 0 2 2 0 8 0 mbufpl 256 27654 0 27487 18 0 18 18 0 8 2 bufpl 280 10229 0 4015 445 0 445 445 0 8 0 anonpl 24 325251 0 319743 57 0 57 57 0 187 18 amapchunkpl 152 68096 0 67602 30 0 30 30 0 158 8 amappl16 200 6263 0 6098 26 14 12 16 0 8 3 amappl15 192 4 0 4 1 0 1 1 0 8 1 amappl14 184 422 0 421 1 0 1 1 0 8 0 amappl13 176 139 0 128 1 0 1 1 0 8 0 amappl12 168 2759 0 2730 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 0 1 1 0 8 1 amappl10 152 70 0 60 1 0 1 1 0 8 0 amappl9 144 252 0 252 1 0 1 1 0 8 1 amappl8 136 109 0 107 1 0 1 1 0 8 0 amappl7 128 155 0 142 1 0 1 1 0 8 0 amappl6 120 175 0 173 1 0 1 1 0 8 0 amappl5 112 109 0 100 1 0 1 1 0 8 0 amappl4 104 282 0 266 1 0 1 1 0 8 0 amappl3 96 14598 0 14485 4 0 4 4 0 8 1 amappl2 88 581 0 522 2 0 2 2 0 8 0 amappl1 80 20068 0 19409 15 0 15 15 0 8 1 amappl 88 18582 0 18412 5 0 5 5 0 92 0 uvmvnodes 80 155 0 0 4 0 4 4 0 8 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma16384 16384 1 0 1 1 0 1 1 0 8 1 dma4096 4096 2 0 2 1 0 1 1 0 8 1 dma2048 2048 1 0 1 1 0 1 1 0 8 1 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma512 512 1 0 1 1 0 1 1 0 8 1 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 260 0 260 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2506 0 2475 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2506 0 2475 1 0 1 1 0 8 0 vmmpekpl 168 17731 0 17688 3 0 3 3 0 8 0 vmmpepl 168 158185 0 156063 100 0 100 100 0 357 5 vmsppl 368 2505 0 2475 4 0 4 4 0 8 1 rwobjpl 40 38728 0 37448 13 0 13 13 0 8 0 pdppl 4096 5018 0 4950 108 38 70 78 0 8 2 pvpl 32 1126685 0 1114184 132 0 132 132 0 265 20 pmappl 216 2505 0 2475 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 386 0 39 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7a2d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838befe0,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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: 0x75a80736afd0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7a2d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838befe0,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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: 0x75a80736afd0, count: -7