uvm_fault(0xffffffff83a5cdf8, 0xffff800029ee6000, 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 * 91823 4487 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a797190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a791568) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a791568,0) 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: 0x78826e80ebc0, 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(0xffffffff83a5cdf8, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a797190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a791568) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a791568,0) 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: 0x78826e80ebc0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c8f3bd0 rbx 0xffff80002a797190 rdx 0xffff80002a736a68 rcx 0xffff800029ee6000 rax 0xfffffd806cac2c00 r8 0 r9 0 r10 0xa50d66e464c4b551 r11 0xbf7ffa1b5bb43c70 r12 0xffffffff830a4250 endtsleep r13 0xffff80002a7914d0 r14 0xffff80002a797190 r15 0 rip 0xffffffff81abd352 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c8f3bb0 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=91823 pid=4487 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=0xffff8000314b27e8,0xffff80002a736018 process=0xffff8000314b4018 user=0xffff80003c8ee000, vmspace=0xfffffd806ca0e5d8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND * 4487 91823 94283 0 7 0 syz-executor 4487 493368 94283 0 2 0x4000000 syz-executor 37214 418614 42452 0 2 0 syz-executor 37214 377558 42452 0 3 0x4000080 rest syz-executor 14862 191076 93719 0 2 0x2 arp 25249 297129 16268 0 2 0 syz-executor 25249 155573 16268 0 3 0x4000080 fsleep syz-executor 71557 252435 48936 0 2 0 syz-executor 71557 62543 48936 0 2 0x4000000 syz-executor 71557 298946 48936 0 3 0x4000080 fsleep syz-executor 93719 183465 60459 0 3 0x10008a sigsusp sh 94160 236803 30084 -1 3 0x90 nanoslp syz-executor 94160 175892 30084 -1 3 0x4000090 ttyin syz-executor 94160 240279 30084 -1 3 0x4000090 fsleep syz-executor 60459 383311 63258 0 3 0x82 wait syz-executor 63612 368081 70626 0 2 0xc80 syz-executor 63612 106088 70626 0 3 0x4000080 lockf syz-executor 63612 278944 70626 0 3 0x4000080 fsleep syz-executor 53988 44221 66443 0 2 0x10 syz-executor 53988 71856 66443 0 3 0x4000090 kqpoll syz-executor 53988 493151 66443 0 3 0x4000090 fsleep syz-executor 45412 29311 0 0 3 0x14280 nfsidl nfsio 34005 87506 0 0 3 0x14280 nfsidl nfsio 57926 410550 0 0 3 0x14280 nfsidl nfsio 90761 177764 0 0 3 0x14280 nfsidl nfsio 49595 474117 0 0 3 0x14280 nfsidl nfsio 24273 501709 0 0 3 0x14280 nfsidl nfsio 14484 488434 0 0 3 0x14280 nfsidl nfsio 85034 5313 0 0 3 0x14280 nfsidl nfsio 11861 212515 0 0 3 0x14280 nfsidl nfsio 11613 16905 0 0 3 0x14280 nfsidl nfsio 12969 37714 0 0 3 0x14280 nfsidl nfsio 12230 352218 0 0 3 0x14280 nfsidl nfsio 55450 500606 0 0 3 0x14280 nfsidl nfsio 8642 185892 0 0 3 0x14280 nfsidl nfsio 17500 26403 0 0 3 0x14280 nfsidl nfsio 56764 178565 0 0 3 0x14280 nfsidl nfsio 78471 449040 0 0 3 0x14280 nfsidl nfsio 10475 81177 0 0 3 0x14280 nfsidl nfsio 78162 375246 0 0 3 0x14280 nfsidl nfsio 4512 286821 0 0 3 0x14280 nfsidl nfsio 16268 165171 63258 0 3 0x82 nanoslp syz-executor 27968 438981 1 0 3 0x100083 ttyin getty 66443 309987 63258 0 3 0x82 nanoslp syz-executor 48936 34450 63258 0 3 0x82 nanoslp syz-executor 94283 467934 63258 0 3 0x82 nanoslp syz-executor 42452 170586 63258 0 3 0x82 nanoslp syz-executor 70626 177966 63258 0 3 0x82 nanoslp syz-executor 30084 98895 63258 0 3 0x82 nanoslp syz-executor 63258 438062 1 0 3 0x82 kqread syz-executor 87743 335634 0 0 3 0x14200 bored smr 26250 290887 0 0 2 0x14200 zerothread 38250 159652 0 0 3 0x14200 aiodoned aiodoned 20451 144182 0 0 3 0x14200 syncer update 3380 91247 0 0 3 0x14200 cleaner cleaner 19924 271728 0 0 3 0x14200 reaper reaper 87488 93717 0 0 3 0x14200 pgdaemon pagedaemon 40470 122850 0 0 3 0x14200 bored viomb 62355 408072 0 0 3 0x40014200 acpi0 acpi0 97562 84221 0 0 3 0x14200 bored softnet0 77078 476345 0 0 3 0x14200 bored systqmp 85408 190849 0 0 3 0x14200 bored systq 44209 361114 0 0 3 0x40014200 tmoslp softclock 10127 254700 0 0 3 0x40014200 idle0 1 18065 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 11038 12166K 12448K 166960K 12462 0 pcb 19 12K 12K 166960K 84 0 rtable 219 15K 16K 166960K 535 0 pf 35 14K 19K 166960K 276 0 ifaddr 35 5K 8K 166960K 71 0 ifgroup 50 2K 2K 166960K 93 0 sysctl 2 1K 9K 166960K 10 0 counters 33 17K 17K 166960K 48 0 ioctlops 0 0K 4K 166960K 250 0 iov 0 0K 16K 166960K 14 0 mount 1 1K 1K 166960K 1 0 log 2 8K 8K 166960K 6 0 vnodes 1317 83K 83K 166960K 1726 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 20K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 69K 89K 166960K 490 0 sigio 0 0K 0K 166960K 10 0 proc 20 25K 91K 166960K 598 0 subproc 72 4K 4K 166960K 164 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 34 0 in_multi 71 5K 7K 166960K 164 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 10 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 496 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 147 75K 159K 166960K 5828 0 UVM aobj 11 4K 4K 166960K 13 0 pinsyscall 21 42K 92K 166960K 1665 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 11 0K 2K 166960K 47 0 temp 41 9107K 9171K 166960K 22113 0 kqueue 1 2K 29K 166960K 99 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 61 0 61 1 0 1 1 0 8 1 rtentry 136 158 0 75 4 0 4 4 0 8 0 unpcb 144 435 0 433 6 5 1 6 0 8 0 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpcb 736 177 0 176 7 6 1 7 0 8 0 arp 96 25 0 11 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 0 1 0 1 1 0 8 0 inpcb 328 529 0 522 17 11 6 12 0 8 5 nd6 112 37 0 21 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1072 8 0 8 2 1 1 1 0 8 1 pfstscr 40 5 0 4 1 0 1 1 0 8 0 pfrktable 1344 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 70 0 67 2 1 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 644 0 315 34 7 27 34 0 8 3 art_table 40 646 0 315 6 0 6 6 0 8 0 art_node 32 158 0 82 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semapl 72 15 0 5 1 0 1 1 0 8 0 shmpl 112 10 0 2 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2159 0 700 92 0 92 92 0 8 0 ffsino 256 2159 0 700 92 0 92 92 0 8 0 nchpl 144 2800 0 1094 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2503 0 0 140 0 140 140 0 8 0 namei 1024 9632 0 9632 2 1 1 1 0 8 1 kstatmem 264 49 0 26 2 0 2 2 0 8 0 scsiplug 72 4 0 4 2 1 1 1 0 8 1 scxspl 216 13275 0 13275 4 3 1 4 1 8 1 plimitpl 152 69 0 57 1 0 1 1 0 8 0 sigapl 424 802 0 748 8 1 7 7 0 8 1 knotepl 120 20625 0 20608 35 26 9 21 0 8 7 kqueuepl 184 116 0 114 1 0 1 1 0 8 0 pipepl 304 143 0 116 3 0 3 3 0 8 0 fdescpl 448 768 0 747 5 1 4 5 0 8 0 filepl 120 3980 0 3808 15 7 8 15 0 8 1 lockfpl 104 206 0 202 1 0 1 1 0 8 0 lockfspl 48 97 0 95 1 0 1 1 0 8 0 sessionpl 144 37 0 34 1 0 1 1 0 8 0 pgrppl 48 53 0 42 1 0 1 1 0 8 0 ucredpl 104 452 0 447 1 0 1 1 0 8 0 zombiepl 144 748 0 748 1 0 1 1 0 8 1 processpl 1152 802 0 748 4 0 4 4 0 8 0 procpl 664 1298 0 1233 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 1040 0 1031 24 19 5 21 0 8 3 mcl64k 65536 13 0 12 1 0 1 1 0 8 0 mcl16k 16384 6 0 6 2 1 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 12 0 12 2 1 1 1 0 8 1 mcl4k 4096 2926 0 2871 14 6 8 14 0 8 0 mcl2k 2048 397 0 395 5 3 2 4 0 8 1 mtagpl 96 9 0 7 2 1 1 1 0 8 0 mbufpl 256 7818 0 7678 20 4 16 20 0 8 0 bufpl 280 6224 0 103 438 0 438 438 0 8 0 anonpl 24 134268 0 132135 83 22 61 61 0 186 36 amapchunkpl 152 24215 0 23817 35 11 24 31 0 158 4 amappl16 200 2606 0 2561 32 14 18 21 0 8 14 amappl15 192 9 0 9 1 0 1 1 0 8 1 amappl14 184 438 0 437 1 0 1 1 0 8 0 amappl13 176 122 0 121 1 0 1 1 0 8 0 amappl12 168 1014 0 995 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 76 0 76 1 0 1 1 0 8 1 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 102 0 102 1 0 1 1 0 8 1 amappl7 128 155 0 153 1 0 1 1 0 8 0 amappl6 120 178 0 177 1 0 1 1 0 8 0 amappl5 112 90 0 89 1 0 1 1 0 8 0 amappl4 104 287 0 284 1 0 1 1 0 8 0 amappl3 96 3531 0 3440 3 0 3 3 0 8 0 amappl2 88 546 0 535 2 0 2 2 0 8 0 amappl1 80 11781 0 11638 12 0 12 12 0 8 4 amappl 88 5048 0 4917 4 0 4 4 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 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 12 0 2 1 0 1 1 0 8 0 uaddrrnd 24 768 0 747 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 768 0 747 1 0 1 1 0 8 0 vmmpekpl 168 7733 0 7691 3 0 3 3 0 8 0 vmmpepl 168 56980 0 56031 98 5 93 93 0 357 46 vmsppl 368 767 0 747 4 1 3 4 0 8 0 rwobjpl 40 18505 0 17997 15 2 13 13 0 8 2 pdppl 4096 1542 0 1494 104 56 48 78 0 8 0 pvpl 32 350201 0 345036 163 29 134 134 0 265 67 pmappl 216 767 0 747 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 396 0 91 11 1 10 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a797190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a791568) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a791568,0) 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: 0x78826e80ebc0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a797190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a791568) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a791568,0) 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: 0x78826e80ebc0, count: -7 ddb>