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 *444139 67133 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a79fa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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: 0x7aa7861babd0, 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,ffff80002a79fa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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: 0x7aa7861babd0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c909910 rbx 0xffff80002a79fa90 rdx 0xffff80002dcb1a08 rcx 0xffff800029ee6000 rax 0xfffffd806cab4d80 r8 0 r9 0 r10 0x5052927212392d0d r11 0xc5249367b9601738 r12 0xffffffff830a4250 endtsleep r13 0xffff80002a7367d0 r14 0xffff80002a79fa90 r15 0 rip 0xffffffff81abd352 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c9098f0 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=444139 pid=67133 tcnt=3 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=0xffff80002a766d08,0xffff80002dcb07f0 process=0xffff80003c966420 user=0xffff80003c904000, vmspace=0xfffffd806ca9a740 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *67133 444139 63236 0 7 0 syz-executor 67133 95482 63236 0 2 0x4000000 syz-executor 67133 500166 63236 0 3 0x4000080 fsleep syz-executor 47958 292654 17434 0 3 0x80 nanoslp syz-executor 47958 64721 17434 0 3 0x4000080 kqsel syz-executor 47958 362557 17434 0 3 0x4000080 fsleep syz-executor 72112 309258 86460 60929 3 0x90 nanoslp syz-executor 72112 302081 86460 60929 3 0x4000090 msgwait syz-executor 72112 170585 86460 60929 3 0x4000090 fsleep syz-executor 72112 367850 86460 60929 3 0x4000090 fsleep syz-executor 37520 47427 17683 0 3 0x80 nanoslp syz-executor 37520 412360 17683 0 3 0x4000080 msgwait syz-executor 37520 281172 17683 0 3 0x4000080 fsleep syz-executor 40074 358309 58866 0 2 0xc80 syz-executor 40074 303077 58866 0 3 0x4000080 ttyin syz-executor 40074 78520 58866 0 3 0x4000080 ttyin syz-executor 88432 94814 58324 0 2 0xc80 syz-executor 88432 106996 58324 0 3 0x4000080 ttyout syz-executor 88432 413921 58324 0 3 0x4000080 fsleep syz-executor 7830 248170 1 0 3 0x82 nanoslp getty 31216 250398 0 0 3 0x14280 nfsidl nfsio 20191 511227 0 0 3 0x14280 nfsidl nfsio 47100 210281 0 0 3 0x14280 nfsidl nfsio 49244 488839 0 0 3 0x14280 nfsidl nfsio 10138 155890 0 0 3 0x14280 nfsidl nfsio 67753 361637 0 0 3 0x14280 nfsidl nfsio 74541 499781 0 0 3 0x14280 nfsidl nfsio 79231 292471 0 0 3 0x14280 nfsidl nfsio 17955 460115 0 0 3 0x14280 nfsidl nfsio 61800 185885 0 0 3 0x14280 nfsidl nfsio 97118 301062 0 0 3 0x14280 nfsidl nfsio 41065 317989 0 0 3 0x14280 nfsidl nfsio 85376 310651 0 0 3 0x14280 nfsidl nfsio 99494 499438 0 0 3 0x14280 nfsidl nfsio 70025 131373 0 0 3 0x14280 nfsidl nfsio 61389 233506 0 0 3 0x14280 nfsidl nfsio 62012 400449 0 0 3 0x14280 nfsidl nfsio 11353 363361 0 0 3 0x14280 nfsidl nfsio 21883 207638 0 0 3 0x14280 nfsidl nfsio 28186 123011 0 0 3 0x14280 nfsidl nfsio 86460 425085 18418 0 3 0x82 nanoslp syz-executor 17683 55519 18418 0 3 0x82 nanoslp syz-executor 68685 402131 18418 0 2 0x2 syz-executor 17434 276625 18418 0 3 0x82 nanoslp syz-executor 63236 229286 18418 0 3 0x82 nanoslp syz-executor 58866 311548 18418 0 3 0x82 nanoslp syz-executor 18134 457941 18418 0 2 0x2 syz-executor 58324 470267 18418 0 3 0x82 nanoslp syz-executor 18418 90297 1 0 3 0x82 kqread syz-executor 60128 356397 1 73 3 0x1100090 kqread syslogd 40236 502642 0 0 3 0x14200 bored smr 31304 478018 0 0 2 0x14200 zerothread 45447 378744 0 0 3 0x14200 aiodoned aiodoned 24183 57591 0 0 3 0x14200 syncer update 43665 493029 0 0 3 0x14200 cleaner cleaner 18663 61470 0 0 3 0x14200 reaper reaper 88613 423379 0 0 3 0x14200 pgdaemon pagedaemon 38650 174680 0 0 3 0x14200 bored viomb 92940 347957 0 0 3 0x40014200 acpi0 acpi0 62573 194584 0 0 3 0x14200 bored softnet0 18453 427690 0 0 3 0x14200 bored systqmp 53072 312479 0 0 3 0x14200 bored systq 25421 97190 0 0 3 0x40014200 tmoslp softclock 66641 497410 0 0 3 0x40014200 idle0 1 268159 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 11031 12099K 12438K 166960K 12462 0 pcb 18 14K 15K 166960K 105 0 rtable 245 9K 9K 166960K 419 0 pf 33 13K 20K 166960K 69 0 ifaddr 39 6K 7K 166960K 54 0 ifgroup 51 2K 2K 166960K 70 0 sysctl 3 1K 9K 166960K 9 0 counters 33 17K 18K 166960K 42 0 ioctlops 0 0K 4K 166960K 110 0 iov 0 0K 12K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1358 85K 86K 166960K 1604 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 384 0 proc 23 33K 83K 166960K 523 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 22 0 in_multi 88 6K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 427 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 152 84K 169K 166960K 4795 0 UVM aobj 42 2K 2K 166960K 42 0 pinsyscall 20 40K 92K 166960K 1462 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 11 0K 2K 166960K 35 0 temp 45 9104K 9108K 166960K 17115 0 kqueue 3 4K 24K 166960K 63 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 50 0 50 1 0 1 1 0 8 1 rtentry 136 123 0 18 5 0 5 5 0 8 1 unpcb 144 149 0 145 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 67 0 64 1 0 1 1 0 8 0 arp 96 19 0 2 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 1 1 0 1 1 0 8 0 inpcb 328 375 0 368 10 1 9 10 0 8 7 ip6q 72 4 0 4 1 0 1 1 0 8 1 ip6af 40 8 0 8 1 0 1 1 0 8 1 nd6 112 34 0 8 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 7 0 7 1 0 1 1 0 8 1 pfstscr 40 2 0 0 1 0 1 1 0 8 0 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 4 0 2 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 6 0 5 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 548 0 128 34 0 34 34 0 8 5 art_table 40 550 0 128 6 0 6 6 0 8 0 art_node 32 123 0 27 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 13 0 3 1 0 1 1 0 8 0 shmpl 112 39 0 0 2 0 2 2 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1969 0 513 92 0 92 92 0 8 0 ffsino 256 1969 0 513 92 0 92 92 0 8 0 nchpl 144 2500 0 807 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 2222 0 0 124 0 124 124 0 8 0 namei 1024 8321 0 8321 2 0 2 2 0 8 2 kstatmem 264 37 0 14 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 9844 0 9844 4 0 4 4 1 8 4 plimitpl 152 124 0 112 1 0 1 1 0 8 0 sigapl 424 674 0 622 8 0 8 8 0 8 0 knotepl 120 10323 0 10301 9 0 9 9 0 8 7 kqueuepl 184 89 0 85 1 0 1 1 0 8 0 pipepl 304 203 0 176 8 0 8 8 0 8 5 fdescpl 448 641 0 622 5 0 5 5 0 8 1 filepl 120 3448 0 3262 12 0 12 12 0 8 4 lockfpl 104 140 0 140 1 0 1 1 0 8 1 lockfspl 48 30 0 30 1 0 1 1 0 8 1 sessionpl 144 63 0 59 1 0 1 1 0 8 0 pgrppl 48 71 0 59 1 0 1 1 0 8 0 ucredpl 104 331 0 325 1 0 1 1 0 8 0 zombiepl 144 622 0 622 1 0 1 1 0 8 1 processpl 1152 674 0 622 5 0 5 5 0 8 0 procpl 664 1022 0 957 7 0 7 7 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 552 588 0 577 10 1 9 10 0 8 8 mcl64k 65536 29 0 29 1 0 1 1 0 8 1 mcl16k 16384 8 0 8 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k128 9344 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 1 0 1 1 0 8 1 mcl4k 4096 2835 0 2778 16 0 16 16 0 8 8 mcl2k 2048 296 0 294 3 0 3 3 0 8 2 mtagpl 96 5 0 4 1 0 1 1 0 8 0 mbufpl 256 6782 0 6624 24 2 22 24 0 8 8 bufpl 280 6774 0 558 445 0 445 445 0 8 0 anonpl 24 105567 0 103723 46 0 46 46 0 186 15 amapchunkpl 152 15678 0 15289 41 0 41 41 0 158 22 amappl16 200 1734 0 1713 21 2 19 19 0 8 13 amappl15 192 4 0 4 1 0 1 1 0 8 1 amappl14 184 408 0 408 1 0 1 1 0 8 1 amappl13 176 164 0 162 1 0 1 1 0 8 0 amappl12 168 874 0 856 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 0 1 1 0 8 1 amappl10 152 56 0 54 1 0 1 1 0 8 0 amappl9 144 271 0 271 1 0 1 1 0 8 1 amappl8 136 92 0 91 1 0 1 1 0 8 0 amappl7 128 138 0 134 1 0 1 1 0 8 0 amappl6 120 146 0 146 1 0 1 1 0 8 1 amappl5 112 205 0 203 1 0 1 1 0 8 0 amappl4 104 264 0 257 1 0 1 1 0 8 0 amappl3 96 2903 0 2820 4 0 4 4 0 8 1 amappl2 88 522 0 508 2 0 2 2 0 8 0 amappl1 80 11052 0 10905 13 0 13 13 0 8 7 amappl 88 4075 0 3944 5 0 5 5 0 92 1 uvmvnodes 80 105 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 128 253 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 41 0 0 1 0 1 1 0 8 0 uaddrrnd 24 641 0 622 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 641 0 622 1 0 1 1 0 8 0 vmmpekpl 168 7229 0 7198 2 0 2 2 0 8 0 vmmpepl 168 48940 0 48040 91 0 91 91 0 357 34 vmsppl 368 640 0 622 4 0 4 4 0 8 1 rwobjpl 40 16431 0 15907 13 0 13 13 0 8 0 pdppl 4096 1288 0 1244 92 26 66 78 0 8 22 pvpl 32 293186 0 288850 112 0 112 112 0 265 41 pmappl 216 640 0 622 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 379 0 28 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a79fa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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: 0x7aa7861babd0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a79fa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8391aa60,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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: 0x7aa7861babd0, count: -7 ddb>