uvm_fault(0xffffffff83a0b5a0, 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 * 27141 74729 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7a0490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838bf460,ffff80002a787800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a787800,0) 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: 0x7ba5e77e2f80, 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(0xffffffff83a0b5a0, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7a0490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838bf460,ffff80002a787800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a787800,0) 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: 0x7ba5e77e2f80, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c4f5a60 rbx 0xffff80002a7a0490 rdx 0xffff80003c9a5a20 rcx 0xffff800029ef6000 rax 0xfffffd806cb32f30 r8 0 r9 0 r10 0xae9429c1deeb558b r11 0xcdc04f2ac2035283 r12 0xffffffff81fd3db0 endtsleep r13 0xffff80002a787768 r14 0xffff80002a7a0490 r15 0 rip 0xffffffff81ac1452 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c4f5a40 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=27141 pid=74729 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a747760,0xffff80003c9a5268 process=0xffff8000ffff9698 user=0xffff80003c4f0000, vmspace=0xfffffd806cb288b0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 60877 499952 91079 0 2 0 syz-executor 60877 499716 91079 0 3 0x4000080 fsleep syz-executor *74729 27141 64892 0 7 0 syz-executor 74729 337879 64892 0 3 0x4000080 fsleep syz-executor 86972 265642 78411 0 3 0x80 nanoslp syz-executor 86972 20860 78411 0 3 0x4000080 fsleep syz-executor 21276 433084 34523 0 2 0 syz-executor 21276 239910 34523 0 3 0x4000080 fsleep syz-executor 52840 336788 40827 0 2 0 syz-executor 52840 481248 40827 0 3 0x4000080 fsleep syz-executor 17017 245450 71406 0 2 0 syz-executor 17017 197968 71406 0 3 0x4000080 dtread syz-executor 54335 316909 34054 0 2 0 syz-executor 54335 294237 34054 0 3 0x4000080 fsleep syz-executor 28686 197894 16735 0 2 0 syz-executor 28686 186246 16735 0 3 0x4000080 fifow syz-executor 28686 419368 16735 0 3 0x4000080 fifow syz-executor 64892 127934 36613 0 3 0x82 nanoslp syz-executor 40827 287476 36613 0 3 0x82 nanoslp syz-executor 78411 222919 36613 0 3 0x82 nanoslp syz-executor 16735 113781 36613 0 3 0x82 nanoslp syz-executor 34054 422310 36613 0 3 0x82 nanoslp syz-executor 91079 114126 36613 0 3 0x82 nanoslp syz-executor 71406 170104 36613 0 3 0x82 nanoslp syz-executor 34523 33423 36613 0 3 0x82 nanoslp syz-executor 36613 59223 65742 0 2 0x2 syz-executor 65742 218834 36438 0 3 0x10008a sigsusp ksh 36438 409097 82421 0 3 0x98 kqread sshd-session 82421 310156 77324 0 3 0x92 kqread sshd-session 39676 218726 1 0 3 0x100083 ttyin getty 77324 263248 1 0 3 0x88 kqread sshd 66007 263793 31953 73 3 0x1100090 kqread syslogd 31953 253444 1 0 3 0x100082 sbwait syslogd 36282 355636 1 0 3 0x100080 kqread resolvd 47328 164951 81809 77 3 0x100092 kqread dhcpleased 76530 141657 81809 77 3 0x100092 kqread dhcpleased 81809 363121 1 0 3 0x80 kqread dhcpleased 34249 42725 0 0 3 0x14200 bored smr 11006 272100 0 0 2 0x14200 zerothread 76204 205750 0 0 3 0x14200 aiodoned aiodoned 60001 417046 0 0 3 0x14200 syncer update 44105 515678 0 0 3 0x14200 cleaner cleaner 44589 48921 0 0 3 0x14200 reaper reaper 50331 125972 0 0 3 0x14200 pgdaemon pagedaemon 29447 184536 0 0 3 0x14200 bored viomb 77644 471202 0 0 3 0x40014200 acpi0 acpi0 17031 369701 0 0 3 0x14200 bored softnet0 98333 217513 0 0 3 0x14200 bored systqmp 74310 370915 0 0 3 0x14200 bored systq 11636 48546 0 0 3 0x40014200 tmoslp softclock 67664 407328 0 0 3 0x40014200 idle0 1 419074 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 12157K 12498K 166960K 12381 0 pcb 18 12K 12K 166960K 94 0 rtable 233 8K 10K 166960K 492 0 pf 31 13K 93K 166960K 272 0 ifaddr 40 7K 7K 166960K 54 0 ifgroup 50 2K 2K 166960K 72 0 sysctl 3 1K 9K 166960K 10 0 counters 33 17K 18K 166960K 44 0 ioctlops 0 0K 4K 166960K 155 0 iov 1 12K 16K 166960K 20 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1294 81K 82K 166960K 1621 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 23 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 110K 166960K 512 0 sigio 0 0K 0K 166960K 24 0 proc 60 59K 124K 166960K 519 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 0 0K 0K 166960K 57 0 in_multi 90 6K 7K 166960K 103 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 14 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 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 234 143K 159K 166960K 6127 0 UVM aobj 19 2K 4K 166960K 21 0 pinsyscall 39 78K 96K 166960K 1609 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 11 0K 2K 166960K 35 0 temp 48 9069K 9135K 166960K 35828 0 kqueue 14 22K 28K 166960K 115 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 71 0 66 1 0 1 1 0 8 0 rtentry 136 123 0 23 4 0 4 4 0 8 0 unpcb 144 245 0 228 1 0 1 1 0 8 0 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 132 0 124 4 0 4 4 0 8 3 arp 96 20 0 2 1 0 1 1 0 8 0 ipq 40 6 0 0 1 0 1 1 0 8 0 ipqe 40 12 0 1 1 0 1 1 0 8 0 inpcb 328 355 0 341 4 0 4 4 0 8 2 ip6q 72 1 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 2 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 9 0 9 1 0 1 1 0 8 1 pfrktable 1344 7 0 7 1 0 1 1 0 8 1 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 6 0 1 1 0 1 1 0 8 0 pftag 88 2 0 2 1 0 1 1 0 8 1 pfrule 1360 60 0 60 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 501 0 72 29 0 29 29 0 8 2 art_table 40 503 0 72 5 0 5 5 0 8 0 art_node 32 123 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 6 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 18 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2257 0 805 92 0 92 92 0 8 0 ffsino 256 2257 0 805 92 0 92 92 0 8 0 nchpl 144 2978 0 1281 64 0 64 64 0 8 1 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2472 0 0 138 0 138 138 0 8 0 namei 1024 9458 0 9458 2 0 2 2 0 8 2 pfiaddrpl 120 2 0 2 1 0 1 1 0 8 1 kstatmem 264 38 0 16 2 0 2 2 0 8 0 scxspl 216 14033 0 14033 8 0 8 8 1 8 8 plimitpl 152 78 0 61 1 0 1 1 0 8 0 sigapl 424 823 0 780 8 0 8 8 0 8 2 knotepl 120 294414 0 294317 10 0 10 10 0 8 7 kqueuepl 184 201 0 191 3 0 3 3 0 8 2 pipepl 304 142 0 115 3 0 3 3 0 8 0 fdescpl 448 788 0 758 5 0 5 5 0 8 1 filepl 120 3910 0 3688 10 0 10 10 0 8 3 lockfpl 104 127 0 124 1 0 1 1 0 8 0 lockfspl 48 48 0 45 1 0 1 1 0 8 0 sessionpl 144 113 0 105 1 0 1 1 0 8 0 pgrppl 48 122 0 106 1 0 1 1 0 8 0 ucredpl 104 552 0 541 1 0 1 1 0 8 0 zombiepl 144 780 0 780 1 0 1 1 0 8 1 processpl 1152 823 0 780 5 0 5 5 0 8 1 procpl 664 1371 0 1319 7 0 7 7 0 8 2 sockpl 552 718 0 682 5 0 5 5 0 8 2 mcl64k 65536 60 0 58 1 0 1 1 0 8 0 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 1 0 1 1 0 8 1 mcl4k 4096 3023 0 2965 15 0 15 15 0 8 7 mcl2k 2048 480 0 473 3 0 3 3 0 8 1 mtagpl 96 8 0 6 1 0 1 1 0 8 0 mbufpl 256 8219 0 7998 22 0 22 22 0 8 6 bufpl 280 6745 0 531 444 0 444 444 0 8 0 anonpl 24 166709 0 158394 84 0 84 84 0 187 2 amapchunkpl 152 19844 0 19269 30 0 30 30 0 158 7 amappl16 200 3933 0 3671 30 1 29 29 0 8 0 amappl15 192 56 0 56 1 0 1 1 0 8 1 amappl14 184 410 0 408 1 0 1 1 0 8 0 amappl13 176 113 0 103 1 0 1 1 0 8 0 amappl12 168 1029 0 1000 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 0 1 1 0 8 1 amappl10 152 56 0 46 1 0 1 1 0 8 0 amappl9 144 259 0 259 1 0 1 1 0 8 1 amappl8 136 108 0 106 1 0 1 1 0 8 0 amappl7 128 138 0 127 1 0 1 1 0 8 0 amappl6 120 152 0 151 1 0 1 1 0 8 0 amappl5 112 91 0 83 1 0 1 1 0 8 0 amappl4 104 262 0 245 1 0 1 1 0 8 0 amappl3 96 3778 0 3663 4 0 4 4 0 8 0 amappl2 88 534 0 481 2 0 2 2 0 8 0 amappl1 80 11088 0 10536 15 0 15 15 0 8 1 amappl 88 5367 0 5196 5 0 5 5 0 92 0 uvmvnodes 80 105 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 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 128 254 0 254 1 0 1 1 0 8 1 dma64 64 6 0 6 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 20 0 2 1 0 1 1 0 8 0 uaddrrnd 24 788 0 758 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 788 0 758 1 0 1 1 0 8 0 vmmpekpl 168 7845 0 7814 2 0 2 2 0 8 0 vmmpepl 168 58326 0 56257 104 0 104 104 0 357 4 vmsppl 368 787 0 758 4 0 4 4 0 8 1 rwobjpl 40 19505 0 18289 16 0 16 16 0 8 0 pdppl 4096 1582 0 1516 102 34 68 82 0 8 2 pvpl 32 395565 0 380898 175 0 175 175 0 265 21 pmappl 216 787 0 758 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 383 0 34 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7a0490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838bf460,ffff80002a787800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a787800,0) 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: 0x7ba5e77e2f80, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7a0490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838bf460,ffff80002a787800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a787800,0) 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: 0x7ba5e77e2f80, count: -7