uvm_fault(0xffffffff839d8080, 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 *487297 3324 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838be2a0,ffff80002a767800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767800,0) 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: 0x70276cacae60, 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(0xffffffff839d8080, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838be2a0,ffff80002a767800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767800,0) 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: 0x70276cacae60, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c8f2ec0 rbx 0xffff80002a79c910 rdx 0xffff800031cb87f0 rcx 0xffff800029ee6000 rax 0xfffffd806cac6f30 r8 0 r9 0 r10 0x6ebc08bc7d81cf31 r11 0x817c130e9b74b717 r12 0xffffffff81f2f140 endtsleep r13 0xffff80002a767768 r14 0xffff80002a79c910 r15 0 rip 0xffffffff81e11702 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c8f2ea0 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=487297 pid=3324 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=0xffff800031cb9250,0xffff80003c8fb258 process=0xffff8000ffff56a0 user=0xffff80003c8ee000, vmspace=0xfffffd806caba460 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND * 3324 487297 7972 0 7 0 syz-executor 3324 402421 7972 0 2 0x4000000 syz-executor 47411 365478 26620 0 2 0 syz-executor 47411 387579 26620 0 3 0x4000080 rest syz-executor 25522 63265 95613 0 3 0x80 nanoslp syz-executor 25522 63465 95613 0 3 0x4000080 msgwait syz-executor 25522 136801 95613 0 3 0x4000080 fsleep syz-executor 82383 18588 51719 0 2 0x1 syz-executor 82383 505860 51719 0 2 0x4000001 syz-executor 82383 343705 51719 0 3 0x4000081 fsleep syz-executor 62085 286845 1 0 3 0x100083 ttyin getty 96307 287338 0 0 3 0x14280 nfsidl nfsio 78306 467075 0 0 3 0x14280 nfsidl nfsio 25326 495985 0 0 3 0x14280 nfsidl nfsio 74943 234207 0 0 3 0x14280 nfsidl nfsio 5614 462886 0 0 3 0x14280 nfsidl nfsio 12470 350948 0 0 3 0x14280 nfsidl nfsio 32585 99548 0 0 3 0x14280 nfsidl nfsio 27226 440063 0 0 3 0x14280 nfsidl nfsio 1722 242430 0 0 3 0x14280 nfsidl nfsio 62144 496511 0 0 3 0x14280 nfsidl nfsio 75183 285097 0 0 3 0x14280 nfsidl nfsio 21046 61021 0 0 3 0x14280 nfsidl nfsio 42385 12611 0 0 3 0x14280 nfsidl nfsio 72250 331944 0 0 3 0x14280 nfsidl nfsio 71649 482663 0 0 3 0x14280 nfsidl nfsio 74254 505253 0 0 3 0x14280 nfsidl nfsio 15332 250064 0 0 3 0x14280 nfsidl nfsio 246 106487 0 0 3 0x14280 nfsidl nfsio 17501 33173 0 0 3 0x14280 nfsidl nfsio 81157 166118 0 0 3 0x14280 nfsidl nfsio 81789 8132 78415 0 3 0x82 wait syz-executor 7972 297802 78415 0 3 0x82 nanoslp syz-executor 26620 463045 78415 0 3 0x82 nanoslp syz-executor 95613 143568 78415 0 3 0x82 nanoslp syz-executor 60211 392486 78415 0 3 0x82 wait syz-executor 51719 406994 78415 0 3 0x82 nanoslp syz-executor 78415 490009 4342 0 2 0x2 syz-executor 4342 265408 79250 0 3 0x10008a sigsusp ksh 79250 282779 7989 0 3 0x98 kqread sshd-session 7989 58640 47137 0 3 0x92 kqread sshd-session 47137 231742 1 0 3 0x88 kqread sshd 19639 186181 56919 73 3 0x1100090 kqread syslogd 56919 7733 1 0 3 0x100082 sbwait syslogd 76884 100662 1 0 3 0x100080 kqread resolvd 38347 424177 99963 77 3 0x100092 kqread dhcpleased 16594 288087 99963 77 3 0x100092 kqread dhcpleased 99963 144993 1 0 3 0x80 kqread dhcpleased 91418 91325 0 0 3 0x14200 bored smr 93912 24727 0 0 2 0x14200 zerothread 6087 193391 0 0 3 0x14200 aiodoned aiodoned 75327 466343 0 0 3 0x14200 syncer update 29598 496867 0 0 3 0x14200 cleaner cleaner 4154 109664 0 0 3 0x14200 reaper reaper 18543 507335 0 0 3 0x14200 pgdaemon pagedaemon 29857 226737 0 0 3 0x14200 bored viomb 17054 254721 0 0 3 0x40014200 acpi0 acpi0 36299 310715 0 0 3 0x14200 bored softnet0 74127 151310 0 0 3 0x14200 smrbar systqmp 29892 217000 0 0 3 0x14200 bored systq 12805 42001 0 0 3 0x40014200 tmoslp softclock 87611 155182 0 0 3 0x40014200 idle0 1 330758 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 11066 12201K 12396K 166960K 12894 0 pcb 48 15K 16K 166960K 210 0 rtable 226 7K 9K 166960K 466 0 pf 31 13K 21K 166960K 117 0 ifaddr 37 6K 7K 166960K 63 0 ifgroup 46 2K 2K 166960K 88 0 sysctl 3 1K 9K 166960K 11 0 counters 32 17K 18K 166960K 52 0 ioctlops 0 0K 4K 166960K 317 0 iov 1 2K 12K 166960K 49 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1391 87K 88K 166960K 1956 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 29 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 236K 166960K 607 0 sigio 2 0K 0K 166960K 8 0 proc 60 59K 91K 166960K 580 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 88 0 in_multi 84 6K 7K 166960K 135 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 429 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 224 150K 165K 166960K 6813 0 UVM aobj 10 4K 4K 166960K 11 0 pinsyscall 37 74K 92K 166960K 1724 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 41 0 temp 59 9108K 9216K 166960K 35394 0 kqueue 15 24K 30K 166960K 94 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 67 0 64 1 0 1 1 0 8 0 rtentry 136 141 0 42 4 0 4 4 0 8 0 unpcb 144 240 0 223 2 0 2 2 0 8 1 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 172 0 168 4 0 4 4 0 8 3 arp 96 21 0 5 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 0 1 0 1 1 0 8 0 inpcb 328 596 0 557 7 0 7 7 0 8 3 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 112 32 0 11 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 13 0 13 1 0 1 1 0 8 1 pppxif 1416 2 0 2 1 0 1 1 0 8 1 pfstscr 40 67 0 67 1 0 1 1 0 8 1 pfrktable 1344 7 0 7 1 0 1 1 0 8 1 pfsrclim 320 2 0 2 1 0 1 1 0 8 1 pfanchor 1288 9 0 1 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 1 1 0 1 1 0 8 1 pfstkey 128 133 0 133 1 0 1 1 0 8 1 pfstate 384 67 0 67 1 0 1 1 0 8 1 pfrule 1360 9 0 9 1 0 1 1 0 8 1 rttmr 136 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 620 0 211 30 0 30 30 0 8 4 art_table 40 622 0 211 5 0 5 5 0 8 0 art_node 32 138 0 46 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 10 1 0 1 1 0 8 0 semupl 112 3 0 3 1 0 1 1 0 8 1 semapl 72 25 0 15 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2471 0 1010 92 0 92 92 0 8 0 ffsino 256 2473 0 1012 92 0 92 92 0 8 0 nchpl 144 3332 0 1635 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 0 1 1 0 8 1 vnodes 216 2910 0 0 162 0 162 162 0 8 0 namei 1024 12033 0 12033 2 0 2 2 0 8 2 pfiaddrpl 120 2 0 2 1 0 1 1 0 8 1 kstatmem 264 45 0 24 2 0 2 2 0 8 0 scxspl 216 14474 0 14474 8 0 8 8 1 8 8 plimitpl 152 312 0 296 1 0 1 1 0 8 0 sigapl 424 908 0 847 8 0 8 8 0 8 0 knotepl 120 18087 0 18038 10 0 10 10 0 8 8 kqueuepl 184 224 0 213 4 0 4 4 0 8 3 pipepl 304 149 0 122 3 0 3 3 0 8 0 fdescpl 448 875 0 847 5 0 5 5 0 8 1 filepl 120 5747 0 5429 13 0 13 13 0 8 1 lockfpl 104 276 0 272 1 0 1 1 0 8 0 lockfspl 48 81 0 77 1 0 1 1 0 8 0 sessionpl 144 109 0 100 1 0 1 1 0 8 0 pgrppl 48 122 0 105 1 0 1 1 0 8 0 ucredpl 104 965 0 953 1 0 1 1 0 8 0 zombiepl 144 851 0 847 1 0 1 1 0 8 0 processpl 1152 908 0 847 5 0 5 5 0 8 0 procpl 664 1557 0 1490 7 0 7 7 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 923 0 864 7 0 7 7 0 8 2 mcl64k 65536 23 0 23 1 0 1 1 0 8 1 mcl16k 16384 4 0 4 1 0 1 1 0 8 1 mcl9k128 9344 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 10 0 10 1 0 1 1 0 8 1 mcl4k 4096 3096 0 3039 13 0 13 13 0 8 5 mcl2k 2048 701 0 700 2 0 2 2 0 8 1 mtagpl 96 5 0 4 1 0 1 1 0 8 0 mbufpl 256 33126 0 32969 20 0 20 20 0 8 7 bufpl 280 6223 0 105 437 0 437 437 0 8 0 anonpl 24 144840 0 141675 60 0 60 60 0 186 24 amapchunkpl 152 22138 0 21660 27 0 27 27 0 158 6 amappl16 200 2597 0 2567 19 4 15 19 0 8 8 amappl15 192 7 0 7 1 0 1 1 0 8 1 amappl14 184 423 0 422 1 0 1 1 0 8 0 amappl13 176 115 0 105 1 0 1 1 0 8 0 amappl12 168 1118 0 1091 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 0 1 1 0 8 1 amappl10 152 60 0 50 1 0 1 1 0 8 0 amappl9 144 269 0 269 1 0 1 1 0 8 1 amappl8 136 97 0 95 1 0 1 1 0 8 0 amappl7 128 214 0 202 1 0 1 1 0 8 0 amappl6 120 175 0 174 1 0 1 1 0 8 0 amappl5 112 93 0 85 1 0 1 1 0 8 0 amappl4 104 265 0 250 1 0 1 1 0 8 0 amappl3 96 4354 0 4244 4 0 4 4 0 8 0 amappl2 88 534 0 478 2 0 2 2 0 8 0 amappl1 80 12053 0 11505 13 0 13 13 0 8 1 amappl 88 6032 0 5870 5 0 5 5 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 0 8 0 dma65536 65536 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 128 278 0 278 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 875 0 847 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 875 0 847 1 0 1 1 0 8 0 vmmpekpl 168 8487 0 8445 3 0 3 3 0 8 0 vmmpepl 168 62569 0 60816 96 0 96 96 0 357 11 vmsppl 368 874 0 847 4 0 4 4 0 8 1 rwobjpl 40 19450 0 18471 14 0 14 14 0 8 0 pdppl 4096 1756 0 1694 102 36 66 80 0 8 4 pvpl 32 392918 0 384351 129 0 129 129 0 265 35 pmappl 216 874 0 847 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 380 0 36 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838be2a0,ffff80002a767800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767800,0) 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: 0x70276cacae60, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838be2a0,ffff80002a767800) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767800,0) 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: 0x70276cacae60, count: -7