uvm_fault(0xffffffff83aa38c8, 0xffff800029ed6000, 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 *299365 69799 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a78c490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838eabb0,ffff80002a768870) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a768870,0) 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: 0x73d5b0d75b00, 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(0xffffffff83aa38c8, 0xffff800029ed6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a78c490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838eabb0,ffff80002a768870) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a768870,0) 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: 0x73d5b0d75b00, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a767b90 rbx 0xffff80002a78c490 rdx 0xffff80002a726d00 rcx 0xffff800029ed6000 rax 0xfffff1806bde1f60 r8 0 r9 0 r10 0xfa612083505ac5d6 r11 0xfde3de9a3f0b4712 r12 0xffffffff825bb980 endtsleep r13 0xffff80002a7687d8 r14 0xffff80002a78c490 r15 0 rip 0xffffffff81448272 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a767b70 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=299365 pid=69799 tcnt=2 stat=onproc flags process=0 proc=0 runpri=82, usrpri=82, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7274c8,0xffff80002a7682b8 process=0xffff80002a78f190 user=0xffff80002a762000, vmspace=0xfffff1807604ccf0 estcpu=32, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *69799 299365 6618 0 7 0 syz-executor 69799 147880 6618 0 2 0x4000000 syz-executor 53785 46222 74350 0 2 0x2 syz-executor 96752 216036 1 0 3 0x100083 ttyin getty 89311 72959 0 0 3 0x14280 nfsidl nfsio 10370 148892 0 0 3 0x14280 nfsidl nfsio 20970 438834 0 0 3 0x14280 nfsidl nfsio 20330 333936 0 0 3 0x14280 nfsidl nfsio 17445 99488 0 0 3 0x14280 nfsidl nfsio 58372 406731 0 0 3 0x14280 nfsidl nfsio 59153 215394 0 0 3 0x14280 nfsidl nfsio 79912 300717 0 0 3 0x14280 nfsidl nfsio 3621 215381 0 0 3 0x14280 nfsidl nfsio 82977 47668 0 0 3 0x14280 nfsidl nfsio 28154 142413 0 0 3 0x14280 nfsidl nfsio 45335 349692 0 0 3 0x14280 nfsidl nfsio 7637 424019 0 0 3 0x14280 nfsidl nfsio 9971 272774 0 0 3 0x14280 nfsidl nfsio 72417 490718 0 0 3 0x14280 nfsidl nfsio 54805 163170 0 0 3 0x14280 nfsidl nfsio 39325 210254 0 0 3 0x14280 nfsidl nfsio 77726 374988 0 0 3 0x14280 nfsidl nfsio 99590 7317 0 0 3 0x14280 nfsidl nfsio 84263 419655 0 0 3 0x14280 nfsidl nfsio 84219 518939 74350 0 3 0x82 piperd syz-executor 53061 87647 74350 0 3 0x82 piperd syz-executor 9091 313982 74350 0 3 0x82 piperd syz-executor 66840 306741 74350 0 3 0x82 piperd syz-executor 57737 227087 74350 0 3 0x82 piperd syz-executor 6618 254359 74350 0 3 0x82 nanoslp syz-executor 74350 27986 1 0 2 0x2 syz-executor 77171 355572 0 0 2 0x14200 smr 13050 263730 0 0 2 0x14200 zerothread 10175 314942 0 0 3 0x14200 aiodoned aiodoned 66461 51969 0 0 3 0x14200 syncer update 65713 219526 0 0 3 0x14200 cleaner cleaner 1028 444677 0 0 3 0x14200 reaper reaper 77752 458789 0 0 3 0x14200 pgdaemon pagedaemon 9920 301293 0 0 3 0x14200 bored viomb 1901 296650 0 0 3 0x40014200 acpi0 acpi0 80039 379239 0 0 3 0x14200 bored softnet0 54275 117772 0 0 3 0x14200 smrbar systqmp 60571 280487 0 0 3 0x14200 bored systq 38367 396032 0 0 3 0x40014200 tmoslp softclock 10154 343979 0 0 3 0x40014200 idle0 1 48309 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 11046 12109K 13345K 166960K 13331 0 pcb 17 16K 18K 166960K 227 0 rtable 227 8K 9K 166960K 562 0 pf 30 13K 20K 166960K 143 0 ifaddr 35 6K 8K 166960K 85 0 ifgroup 42 1K 2K 166960K 129 0 sysctl 3 1K 9K 166960K 8 0 counters 31 17K 18K 166960K 66 0 ioctlops 0 0K 4K 166960K 326 0 iov 0 0K 16K 166960K 42 0 mount 1 1K 1K 166960K 1 0 log 1 0K 8K 166960K 6 0 vnodes 1447 91K 92K 166960K 2196 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 43 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 10 37K 89K 166960K 770 0 sigio 0 0K 0K 166960K 5 0 proc 20 25K 91K 166960K 678 0 subproc 64 4K 4K 166960K 101 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 152 0 in_multi 81 5K 7K 166960K 164 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 27 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 217 970K 970K 166960K 217 0 exec 0 0K 1K 166960K 540 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 80 81K 177K 166960K 8189 0 UVM aobj 90 5K 6K 166960K 94 0 pinsyscall 13 26K 92K 166960K 1980 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 9 0K 2K 166960K 54 0 temp 70 9119K 9177K 166960K 28755 0 kqueue 1 2K 33K 166960K 149 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 70 1 0 1 1 0 8 1 rtentry 136 174 0 78 5 0 5 5 0 8 0 unpcb 144 481 0 481 7 5 2 6 0 8 2 syncache 336 10 0 10 2 1 1 1 0 8 1 tcpcb 736 509 0 508 13 6 7 7 0 8 6 arp 96 26 0 12 1 0 1 1 0 8 0 inpcb 328 1109 0 1108 15 6 9 9 0 8 8 ip6q 72 2 0 1 1 0 1 1 0 8 0 ip6af 40 3 0 2 1 0 1 1 0 8 0 nd6 112 41 0 19 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 11 0 4 1 0 1 1 0 8 0 ppxss 1072 20 0 20 1 0 1 1 0 8 1 pppxif 1416 7 0 7 1 0 1 1 0 8 1 pfstscr 40 77 0 69 1 0 1 1 0 8 0 pfrktable 1344 4 0 4 1 0 1 1 0 8 1 pfanchor 1288 5 0 1 1 0 1 1 0 8 0 pftag 88 5 0 4 1 0 1 1 0 8 0 pfstitem 24 6 0 1 1 0 1 1 0 8 0 pfstkey 128 45 0 40 1 0 1 1 0 8 0 pfstate 384 40 0 36 1 0 1 1 0 8 0 pfrule 1360 13 0 13 2 1 1 1 0 8 1 rttmr 136 3 0 3 2 1 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 745 0 317 38 2 36 36 0 8 5 art_table 40 748 0 317 6 0 6 6 0 8 0 art_node 32 173 0 85 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 5 2 1 1 1 0 8 0 semapl 72 39 0 29 1 0 1 1 0 8 0 shmpl 112 91 0 4 3 0 3 3 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 2750 0 1292 92 0 92 92 0 8 0 ffsino 256 2750 0 1292 92 0 92 92 0 8 0 nchpl 144 3814 0 2117 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 3374 0 0 188 0 188 188 0 8 0 namei 1024 13392 0 13392 2 1 1 2 0 8 1 pfiaddrpl 120 1 0 1 1 0 1 1 0 8 1 kstatmem 264 65 0 46 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 13998 0 13998 4 3 1 4 1 8 1 plimitpl 152 119 0 109 1 0 1 1 0 8 0 sigapl 424 1085 0 1039 8 0 8 8 0 8 0 knotepl 120 26912 0 26895 38 28 10 18 0 8 8 kqueuepl 184 204 0 203 1 0 1 1 0 8 0 pipepl 304 165 0 138 3 0 3 3 0 8 0 fdescpl 448 1052 0 1039 5 1 4 5 0 8 0 filepl 120 6646 0 6505 16 5 11 13 0 8 4 lockfpl 104 297 0 297 1 0 1 1 0 8 1 lockfspl 48 121 0 121 1 0 1 1 0 8 1 sessionpl 144 50 0 47 1 0 1 1 0 8 0 pgrppl 48 65 0 54 1 0 1 1 0 8 0 ucredpl 104 1144 0 1141 1 0 1 1 0 8 0 zombiepl 144 1040 0 1039 2 1 1 1 0 8 0 processpl 1152 1085 0 1039 5 0 5 5 0 8 0 procpl 664 1972 0 1925 8 1 7 8 0 8 1 sosppl 176 4 0 4 1 0 1 1 0 8 1 sockpl 552 1692 0 1691 17 9 8 12 0 8 7 mcl64k 65536 25 0 25 2 1 1 1 0 8 1 mcl9k128 9344 1 0 1 1 1 0 1 0 8 0 mcl8k 8192 14 0 13 2 1 1 1 0 8 0 mcl4k 4096 3357 0 3307 15 7 8 14 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 660 0 657 2 1 1 1 0 8 0 mtagpl 96 14 0 12 2 1 1 1 0 8 0 mbufpl 256 10858 0 10693 22 5 17 17 0 8 4 bufpl 272 6903 0 688 415 0 415 415 0 8 0 anonpl 24 175929 0 174810 83 32 51 60 0 88 25 amapchunkpl 152 26958 0 26782 44 16 28 35 0 158 15 amappl16 200 3616 0 3597 31 18 13 16 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 464 0 464 1 0 1 1 0 8 1 amappl13 176 131 0 130 1 0 1 1 0 8 0 amappl12 168 1309 0 1297 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 59 0 59 1 0 1 1 0 8 1 amappl9 144 269 0 269 1 0 1 1 0 8 1 amappl8 136 109 0 108 1 0 1 1 0 8 0 amappl7 128 170 0 167 1 0 1 1 0 8 0 amappl6 120 181 0 180 1 0 1 1 0 8 0 amappl5 112 96 0 95 1 0 1 1 0 8 0 amappl4 104 294 0 291 1 0 1 1 0 8 0 amappl3 96 5387 0 5348 5 1 4 4 0 8 1 amappl2 88 583 0 573 2 0 2 2 0 8 0 amappl1 80 13569 0 13474 15 1 14 15 0 8 7 amappl 88 7287 0 7222 5 0 5 5 0 92 0 uvmvnodes 80 121 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 2 1 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 93 0 4 2 0 2 2 0 8 0 uaddrrnd 24 1052 0 1039 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1052 0 1039 1 0 1 1 0 8 0 vmmpekpl 168 10196 0 10155 2 0 2 2 0 8 0 vmmpepl 168 74991 0 74480 110 18 92 103 0 357 49 vmsppl 368 1051 0 1039 4 1 3 4 0 8 0 rwobjpl 40 23063 0 22601 15 2 13 15 0 8 0 pdppl 4096 2110 0 2078 98 50 48 78 0 8 16 pvpl 32 477499 0 474906 181 54 127 143 0 265 65 pmappl 216 1051 0 1039 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 815 0 80 22 0 22 22 0 8 0 ddb> machine ddbcpu 0 No such command ddb>