uvm_fault(0xffffffff83997a28, 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 *318563 74805 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7a1f90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8382b840,ffff80002a747560) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a747560,0) 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: 0x7329cb8104d0, 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(0xffffffff83997a28, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7a1f90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8382b840,ffff80002a747560) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a747560,0) 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: 0x7329cb8104d0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c8f7d80 rbx 0xffff80002a7a1f90 rdx 0xffff80002a787a00 rcx 0xffff800029ef6000 rax 0xfffffd806cd0ade0 r8 0 r9 0 r10 0x4afcbb368cc1b57 r11 0x74a70eee96896fc r12 0xffffffff816c4600 endtsleep r13 0xffff80002a7474c8 r14 0xffff80002a7a1f90 r15 0 rip 0xffffffff821999b2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c8f7d60 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=318563 pid=74805 tcnt=2 stat=onproc flags process=0 proc=0 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000328c9a20,0xffff8000328c82d8 process=0xffff8000318c7618 user=0xffff80003c8f2000, vmspace=0xfffffd806ccf12f0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *74805 318563 48988 0 7 0 syz-executor 74805 20805 48988 0 2 0x4000000 syz-executor 2912 42085 83591 0 2 0 syz-executor 19169 380065 11545 0 2 0 syz-executor 3112 447389 42371 -1 2 0x10 syz-executor 3112 384913 42371 -1 3 0x4000090 fsleep syz-executor 53237 30648 80834 0 2 0 syz-executor 53237 503648 80834 0 2 0x4000000 syz-executor 44569 426641 50493 0 3 0x80 fsleep syz-executor 44569 399747 50493 0 3 0x4000080 kqread syz-executor 44569 366239 50493 0 3 0x4000080 kqread syz-executor 99504 240011 32129 0 3 0x80 fsleep syz-executor 99504 411809 32129 0 3 0x4000080 nanoslp syz-executor 93871 56352 25326 0 3 0x80 fsleep syz-executor 93871 101062 25326 0 3 0x4000080 netcon syz-executor 95390 197254 1 0 3 0x100083 ttyopn getty 43113 519413 0 0 3 0x14280 nfsidl nfsio 99918 96886 0 0 3 0x14280 nfsidl nfsio 51819 173233 0 0 3 0x14280 nfsidl nfsio 8192 161122 0 0 3 0x14280 nfsidl nfsio 47632 150511 0 0 3 0x14280 nfsidl nfsio 12346 261742 0 0 3 0x14280 nfsidl nfsio 15691 100801 0 0 3 0x14280 nfsidl nfsio 30616 276222 0 0 3 0x14280 nfsidl nfsio 24765 399649 0 0 3 0x14280 nfsidl nfsio 89037 295168 0 0 3 0x14280 nfsidl nfsio 8076 88710 0 0 3 0x14280 nfsidl nfsio 85338 259543 0 0 3 0x14280 nfsidl nfsio 80295 135894 0 0 3 0x14280 nfsidl nfsio 43121 374205 0 0 3 0x14280 nfsidl nfsio 99490 165549 0 0 3 0x14280 nfsidl nfsio 79576 26247 0 0 3 0x14280 nfsidl nfsio 10961 426797 0 0 3 0x14280 nfsidl nfsio 10099 273971 0 0 3 0x14280 nfsidl nfsio 85268 142168 0 0 3 0x14280 nfsidl nfsio 54036 455218 0 0 3 0x14280 nfsidl nfsio 42371 319017 50151 0 3 0x82 nanoslp syz-executor 25326 36227 50151 0 3 0x82 nanoslp syz-executor 50493 240997 50151 0 3 0x82 nanoslp syz-executor 80834 88401 50151 0 3 0x82 nanoslp syz-executor 32129 77645 50151 0 3 0x82 nanoslp syz-executor 11545 483662 50151 0 3 0x82 nanoslp syz-executor 48988 195575 50151 0 3 0x82 nanoslp syz-executor 83591 355983 50151 0 3 0x82 nanoslp syz-executor 50151 179667 64047 0 3 0x82 kqread syz-executor 64047 523279 62214 0 3 0x10008a sigsusp ksh 62214 361045 17455 0 3 0x98 kqread sshd-session 17455 231793 29386 0 3 0x92 kqread sshd-session 29386 60646 1 0 3 0x88 kqread sshd 6658 208217 84216 73 3 0x1100090 kqread syslogd 84216 12060 1 0 3 0x100082 sbwait syslogd 52086 50175 1 0 3 0x100080 kqread resolvd 47558 314923 24850 77 3 0x100092 kqread dhcpleased 73374 1111 24850 77 3 0x100092 kqread dhcpleased 24850 131717 1 0 3 0x80 kqread dhcpleased 41867 212628 0 0 3 0x14200 bored smr 40689 44354 0 0 2 0x14200 zerothread 13368 375406 0 0 3 0x14200 aiodoned aiodoned 86251 164724 0 0 3 0x14200 syncer update 94912 173048 0 0 3 0x14200 cleaner cleaner 75136 253837 0 0 3 0x14200 reaper reaper 39965 27558 0 0 3 0x14200 pgdaemon pagedaemon 62901 435451 0 0 3 0x14200 bored viomb 42726 517379 0 0 3 0x40014200 acpi0 acpi0 6787 244036 0 0 3 0x14200 bored softnet0 54416 218441 0 0 3 0x14200 bored systqmp 81069 429054 0 0 3 0x14200 bored systq 89479 305000 0 0 3 0x40014200 tmoslp softclock 77664 66712 0 0 3 0x40014200 idle0 1 511877 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 11049 12176K 12465K 166960K 12686 0 pcb 18 14K 15K 166960K 139 0 rtable 208 8K 9K 166960K 448 0 pf 30 13K 17K 166960K 68 0 ifaddr 37 6K 7K 166960K 66 0 ifgroup 46 2K 2K 166960K 90 0 sysctl 3 1K 9K 166960K 7 0 counters 32 17K 18K 166960K 64 0 ioctlops 0 0K 4K 166960K 153 0 iov 0 0K 16K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1350 85K 85K 166960K 1705 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 541 0 sigio 0 0K 0K 166960K 3 0 proc 60 59K 83K 166960K 543 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 44 0 in_multi 83 6K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 2 0 mrt 2 0K 0K 166960K 18 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 414 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 211 151K 169K 166960K 6498 0 UVM aobj 13 2K 2K 166960K 15 0 pinsyscall 39 78K 91K 166960K 1626 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 19 0 NDP 10 0K 2K 166960K 42 0 temp 53 9066K 9130K 166960K 24585 0 kqueue 14 20K 32K 166960K 96 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 70 0 67 1 0 1 1 0 8 0 rtentry 136 123 0 41 4 0 4 4 0 8 0 unpcb 144 901 0 877 8 0 8 8 0 8 7 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 194 0 186 7 0 7 7 0 8 6 arp 96 19 0 2 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 3 0 2 1 0 1 1 0 8 0 inpcb 328 467 0 453 7 0 7 7 0 8 5 ip6q 72 2 0 0 1 0 1 1 0 8 0 ip6af 40 2 0 0 1 0 1 1 0 8 0 nd6 112 28 0 10 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 27 0 27 1 0 1 1 0 8 1 pppxif 1416 3 0 3 1 0 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 2 0 0 1 0 1 1 0 8 0 pfstate 384 1 0 0 1 0 1 1 0 8 0 pfrule 1360 1 0 0 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 517 0 140 30 0 30 30 0 8 2 art_table 40 520 0 140 5 0 5 5 0 8 0 art_node 32 122 0 47 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 37 1 0 1 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 12 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2300 0 850 92 0 92 92 0 8 0 ffsino 256 2300 0 850 92 0 92 92 0 8 0 nchpl 144 3080 0 1389 64 0 64 64 0 8 0 rtmask 32 8 0 8 1 0 1 1 0 8 1 vnodes 216 2579 0 0 144 0 144 144 0 8 0 namei 1024 9759 0 9759 1 0 1 1 0 8 1 kstatmem 264 52 0 32 3 0 3 3 0 8 1 scxspl 216 14526 0 14526 8 0 8 8 1 8 8 plimitpl 152 87 0 71 1 0 1 1 0 8 0 sigapl 424 841 0 778 8 0 8 8 0 8 0 knotepl 120 22069 0 22021 10 0 10 10 0 8 8 kqueuepl 184 211 0 199 4 0 4 4 0 8 3 pipepl 304 149 0 121 3 0 3 3 0 8 0 fdescpl 448 808 0 778 4 0 4 4 0 8 0 filepl 120 4779 0 4550 14 0 14 14 0 8 6 lockfpl 104 190 0 187 1 0 1 1 0 8 0 lockfspl 48 68 0 65 1 0 1 1 0 8 0 sessionpl 144 42 0 34 1 0 1 1 0 8 0 pgrppl 48 53 0 37 1 0 1 1 0 8 0 ucredpl 104 573 0 560 1 0 1 1 0 8 0 zombiepl 144 778 0 778 1 0 1 1 0 8 1 processpl 1152 841 0 778 5 0 5 5 0 8 0 procpl 664 1460 0 1390 7 0 7 7 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 1460 0 1419 17 7 10 16 0 8 7 mcl64k 65536 25 0 25 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 4 0 4 1 0 1 1 0 8 1 mcl4k 4096 3084 0 3032 14 0 14 14 0 8 6 mcl2k 2048 529 0 528 1 0 1 1 0 8 0 mtagpl 96 8 0 7 1 0 1 1 0 8 0 mbufpl 256 8334 0 8183 16 0 16 16 0 8 4 bufpl 280 6520 0 306 444 0 444 444 0 8 0 anonpl 24 136282 0 130946 64 0 64 64 0 187 31 amapchunkpl 152 27043 0 26489 35 0 35 35 0 158 10 amappl16 200 2402 0 2369 27 14 13 25 0 8 8 amappl15 192 18 0 18 1 0 1 1 0 8 1 amappl14 184 405 0 404 1 0 1 1 0 8 0 amappl13 176 116 0 106 1 0 1 1 0 8 0 amappl12 168 1049 0 1021 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 144 269 0 269 1 0 1 1 0 8 1 amappl8 136 94 0 92 1 0 1 1 0 8 0 amappl7 128 170 0 159 1 0 1 1 0 8 0 amappl6 120 164 0 163 1 0 1 1 0 8 0 amappl5 112 94 0 86 1 0 1 1 0 8 0 amappl4 104 275 0 256 1 0 1 1 0 8 0 amappl3 96 3969 0 3869 4 0 4 4 0 8 0 amappl2 88 529 0 475 2 0 2 2 0 8 0 amappl1 80 11637 0 11096 15 0 15 15 0 8 2 amappl 88 5733 0 5585 5 0 5 5 0 92 0 uvmvnodes 80 109 0 0 3 0 3 3 0 8 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma8192 8192 1 0 1 1 0 1 1 0 8 1 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 128 253 0 253 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 14 0 2 1 0 1 1 0 8 0 uaddrrnd 24 808 0 778 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 808 0 778 1 0 1 1 0 8 0 vmmpekpl 168 8143 0 8110 2 0 2 2 0 8 0 vmmpepl 168 58979 0 57178 99 0 99 99 0 357 12 vmsppl 368 807 0 778 4 0 4 4 0 8 1 rwobjpl 40 18571 0 17621 15 0 15 15 0 8 2 pdppl 4096 1622 0 1556 98 32 66 76 0 8 0 pvpl 32 364225 0 352457 141 0 141 141 0 265 46 pmappl 216 807 0 778 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 374 0 32 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7a1f90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8382b840,ffff80002a747560) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a747560,0) 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: 0x7329cb8104d0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7a1f90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8382b840,ffff80002a747560) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a747560,0) 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: 0x7329cb8104d0, count: -7