uvm_fault(0xffffffff839fa1c0, 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 *410432 67889 0 0x10 0 0 syz-executor kcov_remote_enter(0,ffff80002a79c010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ec10,ffff80002a767a98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767a98,0) 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: 0x7947bc151810, 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(0xffffffff839fa1c0, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a79c010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ec10,ffff80002a767a98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767a98,0) 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: 0x7947bc151810, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a7b1b60 rbx 0xffff80002a79c010 rdx 0xffff80003c8fb4e0 rcx 0xffff800029ee6000 rax 0xffffef806cfbeea0 r8 0 r9 0 r10 0xedf08530d4bc02ce r11 0xd1cb1d83f3d6612a r12 0xffffffff8252ce00 endtsleep r13 0xffff80002a767a00 r14 0xffff80002a79c010 r15 0 rip 0xffffffff82f272e2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a7b1b40 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=410432 pid=67889 tcnt=2 stat=onproc flags process=10 proc=0 runpri=50, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a766d08,0xffff80003c8fbcb8 process=0xffff80002a79ed10 user=0xffff80002a7ac000, vmspace=0xffffef806cfb2e70 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *67889 410432 7409 0 7 0x10 syz-executor 67889 169994 7409 0 2 0x4000010 syz-executor 59790 182651 59035 0 3 0x80 nanoslp syz-executor 59790 84157 59035 0 3 0x4000080 fsleep syz-executor 59790 288941 59035 0 3 0x4000080 sbwait syz-executor 15345 392372 61284 0 2 0 syz-executor 15345 239449 61284 0 3 0x4000080 sbwait syz-executor 78489 449174 95271 0 2 0x1 syz-executor 78489 234974 95271 0 2 0x4000001 syz-executor 78489 274983 95271 0 3 0x4000081 fsleep syz-executor 243 237626 46355 -1 2 0x10 syz-executor 243 485201 46355 -1 3 0x4000090 fsleep syz-executor 243 364234 46355 -1 3 0x4000090 fsleep syz-executor 29134 104280 97127 0 3 0x80 nanoslp syz-executor 29134 245616 97127 0 3 0x4000080 kqread syz-executor 29134 516255 97127 0 3 0x4000080 fsleep syz-executor 29134 451121 97127 0 3 0x4000080 fsleep syz-executor 61607 497322 9196 0 2 0xc80 syz-executor 61607 302769 9196 0 3 0x4000088 kqpoll syz-executor 61607 88521 9196 0 3 0x4000080 fsleep syz-executor 28870 204896 51759 0 3 0x82 nanoslp syz-executor 65071 3076 1 0 3 0x100083 ttyin getty 9196 514195 51759 0 3 0x82 nanoslp syz-executor 42164 60497 0 0 3 0x14280 nfsidl nfsio 22050 489212 0 0 3 0x14280 nfsidl nfsio 45082 376046 0 0 3 0x14280 nfsidl nfsio 28434 298742 0 0 3 0x14280 nfsidl nfsio 24770 303923 0 0 3 0x14280 nfsidl nfsio 2528 165624 0 0 3 0x14280 nfsidl nfsio 35792 516065 0 0 3 0x14280 nfsidl nfsio 27000 257065 0 0 3 0x14280 nfsidl nfsio 81937 141428 0 0 3 0x14280 nfsidl nfsio 56621 306045 0 0 3 0x14280 nfsidl nfsio 74799 70629 0 0 3 0x14280 nfsidl nfsio 74367 21176 0 0 3 0x14280 nfsidl nfsio 86362 373568 0 0 3 0x14280 nfsidl nfsio 22912 34526 0 0 3 0x14280 nfsidl nfsio 68339 322210 0 0 3 0x14280 nfsidl nfsio 40811 487857 0 0 3 0x14280 nfsidl nfsio 25305 515243 0 0 3 0x14280 nfsidl nfsio 99944 287485 0 0 3 0x14280 nfsidl nfsio 82824 112968 0 0 3 0x14280 nfsidl nfsio 93367 435803 0 0 3 0x14280 nfsidl nfsio 46355 64537 51759 0 3 0x82 nanoslp syz-executor 95271 414306 51759 0 3 0x82 nanoslp syz-executor 59035 171555 51759 0 3 0x82 nanoslp syz-executor 7409 420382 51759 0 3 0x82 nanoslp syz-executor 97127 207081 51759 0 3 0x82 nanoslp syz-executor 61284 216149 51759 0 3 0x82 nanoslp syz-executor 51759 287997 1 0 3 0x82 kqread syz-executor 88850 283375 1 73 3 0x1100090 kqread syslogd 78786 359681 0 0 3 0x14200 bored smr 22161 103927 0 0 2 0x14200 zerothread 87671 301199 0 0 3 0x14200 aiodoned aiodoned 8348 251416 0 0 3 0x14200 syncer update 88372 199091 0 0 3 0x14200 cleaner cleaner 25716 221519 0 0 3 0x14200 reaper reaper 29599 467183 0 0 3 0x14200 pgdaemon pagedaemon 16076 434528 0 0 3 0x14200 bored viomb 39529 231902 0 0 3 0x40014200 acpi0 acpi0 56712 350624 0 0 3 0x14200 bored softnet0 28664 504988 0 0 3 0x14200 bored systqmp 74237 48013 0 0 3 0x14200 bored systq 34761 290957 0 0 3 0x40014200 tmoslp softclock 40300 305736 0 0 3 0x40014200 idle0 1 67922 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 11038 12135K 12785K 166960K 13105 0 pcb 18 14K 15K 166960K 106 0 rtable 242 9K 9K 166960K 491 0 pf 43 15K 18K 166960K 88 0 ifaddr 40 6K 7K 166960K 71 0 ifgroup 55 2K 2K 166960K 97 0 sysctl 4 1K 9K 166960K 11 0 counters 34 17K 18K 166960K 60 0 ioctlops 0 0K 4K 166960K 290 0 iov 0 0K 16K 166960K 54 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1389 87K 88K 166960K 1986 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 38 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 232K 166960K 662 0 sigio 0 0K 0K 166960K 10 0 proc 21 33K 124K 166960K 627 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 43 0 in_multi 88 6K 7K 166960K 139 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 433 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 173 92K 164K 166960K 7274 0 UVM aobj 15 4K 4K 166960K 16 0 pinsyscall 22 44K 96K 166960K 1805 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 12 0K 2K 166960K 47 0 temp 51 9113K 9185K 166960K 15241 0 kqueue 5 8K 32K 166960K 151 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 82 0 82 1 0 1 1 0 8 1 rtentry 136 144 0 42 4 0 4 4 0 8 0 unpcb 144 592 0 578 6 0 6 6 0 8 5 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpcb 736 205 0 203 6 0 6 6 0 8 5 arp 96 22 0 6 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 2 0 2 1 0 1 1 0 8 1 inpcb 328 625 0 621 7 0 7 7 0 8 6 nd6 112 34 0 10 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1072 21 0 21 1 0 1 1 0 8 1 pppxif 1416 4 0 4 1 0 1 1 0 8 1 pfstscr 40 16 0 7 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 1 1 0 1 1 0 8 0 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfstlim 224 1 0 1 1 0 1 1 0 8 1 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 9 0 0 1 0 1 1 0 8 0 pfstkey 128 17 0 10 1 0 1 1 0 8 0 pfstate 384 9 0 4 1 0 1 1 0 8 0 pfrule 1360 9 0 8 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 566 0 148 30 0 30 30 0 8 3 art_table 40 567 0 148 5 0 5 5 0 8 0 art_node 32 141 0 48 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 34 0 24 1 0 1 1 0 8 0 shmpl 112 13 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2565 0 1107 92 0 92 92 0 8 0 ffsino 256 2565 0 1107 92 0 92 92 0 8 0 nchpl 144 3461 0 1754 64 0 64 64 0 8 0 rtmask 32 5 0 5 1 0 1 1 0 8 1 vnodes 216 2996 0 0 167 0 167 167 0 8 0 namei 1024 11669 0 11669 2 0 2 2 0 8 2 kstatmem 264 55 0 30 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 0 1 1 0 8 1 scxspl 216 16547 0 16547 5 0 5 5 1 8 5 plimitpl 152 179 0 165 1 0 1 1 0 8 0 sigapl 424 961 0 907 8 0 8 8 0 8 0 knotepl 120 22933 0 22909 21 11 10 16 0 8 8 kqueuepl 184 322 0 317 4 0 4 4 0 8 3 pipepl 304 148 0 121 3 0 3 3 0 8 0 fdescpl 448 928 0 907 5 0 5 5 0 8 1 filepl 120 5724 0 5483 12 0 12 12 0 8 4 lockfpl 104 203 0 203 1 0 1 1 0 8 1 lockfspl 48 89 0 89 1 0 1 1 0 8 1 sessionpl 144 45 0 40 1 0 1 1 0 8 0 pgrppl 48 58 0 45 1 0 1 1 0 8 0 ucredpl 104 844 0 837 1 0 1 1 0 8 0 zombiepl 144 908 0 907 1 0 1 1 0 8 0 processpl 1152 961 0 907 5 0 5 5 0 8 0 procpl 664 1714 0 1647 7 0 7 7 0 8 0 sockpl 552 1329 0 1311 12 2 10 11 0 8 8 mcl64k 65536 93 0 93 1 0 1 1 0 8 1 mcl16k 16384 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 12 0 12 1 0 1 1 0 8 1 mcl4k 4096 3222 0 3169 15 0 15 15 0 8 7 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 489 0 487 2 0 2 2 0 8 1 mtagpl 96 11 0 8 1 0 1 1 0 8 0 mbufpl 256 10016 0 9836 19 0 19 19 0 8 3 bufpl 272 6234 0 102 409 0 409 409 0 8 0 anonpl 24 148071 0 145741 76 0 76 76 0 187 33 amapchunkpl 152 23591 0 23136 34 0 34 34 0 158 15 amappl16 200 2669 0 2629 23 8 15 23 0 8 4 amappl15 192 5 0 5 1 0 1 1 0 8 1 amappl14 184 439 0 439 1 0 1 1 0 8 1 amappl13 176 125 0 123 1 0 1 1 0 8 0 amappl12 168 1172 0 1152 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 0 1 1 0 8 1 amappl10 152 119 0 117 1 0 1 1 0 8 0 amappl9 144 311 0 311 1 0 1 1 0 8 1 amappl8 136 102 0 101 1 0 1 1 0 8 0 amappl7 128 169 0 165 1 0 1 1 0 8 0 amappl6 120 169 0 168 1 0 1 1 0 8 0 amappl5 112 104 0 102 1 0 1 1 0 8 0 amappl4 104 282 0 274 1 0 1 1 0 8 0 amappl3 96 4747 0 4648 4 0 4 4 0 8 0 amappl2 88 540 0 524 2 0 2 2 0 8 0 amappl1 80 12473 0 12312 14 0 14 14 0 8 5 amappl 88 6462 0 6312 5 0 5 5 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma2048 2048 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 15 0 1 1 0 1 1 0 8 0 uaddrrnd 24 928 0 907 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 928 0 907 1 0 1 1 0 8 0 vmmpekpl 168 8889 0 8850 3 0 3 3 0 8 0 vmmpepl 168 65970 0 64924 98 0 98 98 0 357 44 vmsppl 368 927 0 907 4 0 4 4 0 8 1 rwobjpl 40 20443 0 19893 14 0 14 14 0 8 0 pdppl 4096 1862 0 1814 98 50 48 82 0 8 0 pvpl 32 398775 0 393398 146 0 146 146 0 265 63 pmappl 216 927 0 907 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 787 0 50 22 0 22 22 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ec10,ffff80002a767a98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767a98,0) 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: 0x7947bc151810, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8394ec10,ffff80002a767a98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a767a98,0) 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: 0x7947bc151810, count: -7 ddb>