uvm_fault(0xffffffff839b9bc0, 0xffff800029f26000, 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 *164351 98475 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a7dc010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837aba40,ffff80002a7b9800) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7b9800,0) 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: 0x73d319205da0, 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(0xffffffff839b9bc0, 0xffff800029f26000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7dc010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837aba40,ffff80002a7b9800) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7b9800,0) 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: 0x73d319205da0, count: -7 ddb> show registers rdi 0xffffffff rsi 0xffff800000b11c00 rbp 0xffff80003c9435e0 rbx 0xffff80002a7dc010 rdx 0xffff80002a88ba28 rcx 0xffff800029f26000 rax 0xfffffd806cb3bf00 r8 0 r9 0 r10 0x4bb7142173d97ad9 r11 0x9ffad2279df10069 r12 0xffffffff8304fc30 endtsleep r13 0xffff80002a7b9768 r14 0xffff80002a7dc010 r15 0 rip 0xffffffff831ff902 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c9435c0 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=164351 pid=98475 tcnt=3 stat=onproc flags process=0 proc=0 runpri=84, usrpri=85, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7bd4d8,0xffff80002a88aaa8 process=0xffff80002f0ecd98 user=0xffff80003c93e000, vmspace=0xfffffd807c163748 estcpu=35, cpticks=5, pctcpu=0.0, user=4, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 41951 404442 13226 0 2 0 syz-executor 41951 82895 13226 0 3 0x4000080 fsleep syz-executor 91758 29857 5410 0 2 0 syz-executor 91758 209022 5410 0 3 0x4000080 fsleep syz-executor 30143 455741 90055 0 2 0 syz-executor 30143 195714 90055 0 3 0x4000080 fsleep syz-executor 64241 459390 34952 0 2 0 syz-executor 64241 357002 34952 0 2 0x4000000 syz-executor 64241 114611 34952 0 2 0x4000000 syz-executor *98475 164351 49723 0 7 0 syz-executor 98475 322473 49723 0 2 0x4000000 syz-executor 98475 63268 49723 0 2 0x4000000 syz-executor 54475 45684 54846 0 2 0 syz-executor 54475 101308 54846 0 3 0x4000080 fsleep syz-executor 14167 229722 0 0 3 0x14200 acct acct 82727 432528 0 0 3 0x14280 nfsidl nfsio 16332 253836 0 0 3 0x14280 nfsidl nfsio 42328 401198 0 0 3 0x14280 nfsidl nfsio 20455 138566 0 0 3 0x14280 nfsidl nfsio 69481 227584 0 0 3 0x14280 nfsidl nfsio 28404 222750 0 0 3 0x14280 nfsidl nfsio 43177 342726 0 0 3 0x14280 nfsidl nfsio 33583 354795 0 0 3 0x14280 nfsidl nfsio 22710 455866 0 0 3 0x14280 nfsidl nfsio 9464 411596 0 0 3 0x14280 nfsidl nfsio 44521 66868 0 0 3 0x14280 nfsidl nfsio 35006 520976 0 0 3 0x14280 nfsidl nfsio 81851 239430 0 0 3 0x14280 nfsidl nfsio 14661 97378 0 0 3 0x14280 nfsidl nfsio 1886 135484 0 0 3 0x14280 nfsidl nfsio 51640 108156 0 0 3 0x14280 nfsidl nfsio 29357 181287 0 0 3 0x14280 nfsidl nfsio 64952 473702 0 0 3 0x14280 nfsidl nfsio 25308 26010 0 0 3 0x14280 nfsidl nfsio 78615 207365 0 0 3 0x14280 nfsidl nfsio 34952 170585 21647 0 2 0x3 syz-executor 5410 407370 21647 0 3 0x82 nanoslp syz-executor 70665 291447 21647 0 2 0x2 syz-executor 49723 515977 21647 0 2 0x3 syz-executor 13226 323226 21647 0 3 0x82 nanoslp syz-executor 62595 290418 21647 0 3 0x82 nanoslp syz-executor 54846 228618 21647 0 3 0x82 nanoslp syz-executor 90055 463193 21647 0 3 0x82 nanoslp syz-executor 21647 174301 16467 0 3 0x82 kqread syz-executor 16467 282060 67112 0 3 0x10008a sigsusp ksh 67112 456537 99719 0 3 0x98 kqread sshd-session 99719 337972 17475 0 3 0x92 kqread sshd-session 50761 409528 1 0 3 0x100083 ttyopn getty 17475 46932 1 0 3 0x88 kqread sshd 22933 524046 29447 73 3 0x1100090 kqread syslogd 29447 191167 1 0 3 0x100082 sbwait syslogd 15062 298859 1 0 3 0x100080 kqread resolvd 80598 54810 92102 77 3 0x100092 kqread dhcpleased 7062 312121 92102 77 3 0x100092 kqread dhcpleased 92102 414587 1 0 3 0x80 kqread dhcpleased 5537 374284 0 0 3 0x14200 bored smr 72733 169112 0 0 2 0x14200 zerothread 74779 430364 0 0 3 0x14200 aiodoned aiodoned 5435 44119 0 0 3 0x14200 syncer update 46876 274297 0 0 3 0x14200 cleaner cleaner 2874 84600 0 0 3 0x14200 reaper reaper 33186 351345 0 0 3 0x14200 pgdaemon pagedaemon 39783 493346 0 0 3 0x14200 bored viomb 53500 264216 0 0 3 0x40014200 acpi0 acpi0 16211 233088 0 0 3 0x14200 bored softnet0 77958 505510 0 0 3 0x14200 bored systqmp 36518 140448 0 0 3 0x14200 bored systq 59318 257893 0 0 3 0x40014200 tmoslp softclock 98924 97878 0 0 3 0x40014200 idle0 1 21714 0 0 3 0x80082 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 10197 11070K 11650K 166960K 14369 0 pcb 19 16K 17K 166960K 569 0 rtable 200 10K 11K 166960K 720 0 pf 30 13K 20K 166960K 253 0 ifaddr 33 6K 8K 166960K 139 0 ifgroup 42 1K 2K 166960K 227 0 sysctl 4 1K 9K 166960K 15 0 counters 31 17K 18K 166960K 129 0 ioctlops 0 0K 4K 166960K 311 0 iov 0 0K 20K 166960K 192 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1463 92K 93K 166960K 3232 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 29 0 VM map 2 1K 1K 166960K 2 0 sem 27 5K 6K 166960K 78 0 dirhash 57 10K 11K 166960K 303 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 1747 0 sigio 0 0K 0K 166960K 63 0 proc 60 59K 100K 166960K 759 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 277 0 in_multi 73 5K 7K 166960K 199 0 ether_multi 1 0K 0K 166960K 10 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 619 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 221 143K 158K 166960K 16774 0 UVM aobj 43 12K 12K 166960K 54 0 pinsyscall 39 78K 93K 166960K 2914 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 115 0 NDP 9 0K 2K 166960K 103 0 temp 78 8672K 8924K 166960K 77996 0 kqueue 13 20K 34K 166960K 349 0 SYN cache 2 8K 16K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 193 0 190 2 1 1 2 0 8 0 rtentry 136 192 0 115 4 0 4 4 0 8 0 unpcb 144 1207 0 1190 8 2 6 6 0 8 5 syncache 336 8 0 8 1 1 0 1 0 8 0 tcpqe 32 8 0 8 1 1 0 1 0 8 0 tcpcb 736 399 0 392 2 1 1 2 0 8 0 arp 96 28 0 14 1 0 1 1 0 8 0 ipq 40 11 0 11 1 0 1 1 0 8 1 ipqe 40 26 0 26 1 0 1 1 0 8 1 inpcb 328 1617 0 1604 7 5 2 7 0 8 0 ip6q 72 29 0 27 1 0 1 1 0 8 0 ip6af 40 57 0 55 1 0 1 1 0 8 0 nd6 112 48 0 32 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 1 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 1 1 1 0 8 1 ppxss 1072 80 0 80 2 1 1 1 0 8 1 pppxif 1384 7 0 7 1 1 0 1 0 8 0 pfrktable 1344 5 0 5 2 1 1 1 0 8 1 pfanchor 1288 4 0 1 1 0 1 1 0 8 0 pfstitem 24 6 0 0 1 0 1 1 0 8 0 pfstkey 128 9 0 4 1 0 1 1 0 8 0 pfstate 384 5 0 2 1 0 1 1 0 8 0 pfrule 1344 4 0 4 1 1 0 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 845 0 499 30 3 27 30 0 8 1 art_table 40 848 0 499 5 0 5 5 0 8 0 art_node 32 190 0 121 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 70 0 45 1 0 1 1 0 8 0 shmpl 112 43 0 8 1 0 1 1 0 8 0 dirhash 1024 119 0 87 5 0 5 5 0 8 0 dino2pl 256 4652 0 3152 95 0 95 95 0 8 0 ffsino 256 4652 0 3152 95 0 95 95 0 8 0 nchpl 144 7113 0 5415 64 0 64 64 0 8 0 rtmask 32 14 0 14 2 1 1 1 0 8 1 vnodes 216 5897 0 0 328 0 328 328 0 8 0 namei 1024 25040 0 25039 3 2 1 2 0 8 0 vcpupl 3904 5 0 0 1 0 1 1 0 8 0 vmpool 800 8 0 3 1 0 1 1 0 8 0 kstatmem 264 156 0 138 2 0 2 2 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 6 0 6 2 1 1 1 0 8 1 scxspl 216 25430 0 25430 15 7 8 8 1 8 8 plimitpl 152 573 0 556 1 0 1 1 0 8 0 sigapl 424 2054 0 1990 10 2 8 10 0 8 0 knotepl 120 85080 0 85033 43 33 10 17 0 8 8 kqueuepl 184 955 0 946 6 5 1 6 0 8 0 pipepl 304 236 0 209 3 0 3 3 0 8 0 fdescpl 448 1995 0 1965 5 1 4 5 0 8 0 filepl 120 13693 0 13475 14 3 11 13 0 8 2 lockfpl 104 635 0 631 1 0 1 1 0 8 0 lockfspl 48 251 0 247 1 0 1 1 0 8 0 sessionpl 144 28 0 20 1 0 1 1 0 8 0 pgrppl 48 183 0 167 1 0 1 1 0 8 0 ucredpl 104 2432 0 2420 1 0 1 1 0 8 0 zombiepl 144 2230 0 2228 2 1 1 1 0 8 0 processpl 1152 2054 0 1990 6 1 5 6 0 8 0 procpl 664 4461 0 4388 8 0 8 8 0 8 1 sosppl 176 19 0 19 2 1 1 1 0 8 1 sockpl 552 3151 0 3118 19 9 10 12 0 8 7 mcl64k 65536 161 0 161 1 0 1 1 0 8 1 mcl16k 16384 3 0 3 1 1 0 1 0 8 0 mcl12k 12288 2 0 2 1 1 0 1 0 8 0 mcl8k 8192 20 0 20 2 1 1 1 0 8 1 mcl4k 4096 4626 0 4575 14 6 8 13 0 8 1 mcl2k2 2112 2 0 2 2 1 1 1 0 8 1 mcl2k 2048 2636 0 2628 13 10 3 13 0 8 1 mtagpl 96 195 0 89 3 0 3 3 0 8 0 mbufpl 256 23801 0 23587 80 61 19 79 0 8 0 bufpl 280 10079 0 3858 445 0 445 445 0 8 0 anonpl 24 313012 0 309902 95 50 45 88 0 187 12 amapchunkpl 152 59094 0 58643 35 9 26 31 0 158 6 amappl16 200 6246 0 6210 55 40 15 27 0 8 7 amappl15 192 19 0 19 2 1 1 1 0 8 1 amappl14 184 2 0 2 1 1 0 1 0 8 0 amappl13 176 454 0 453 1 0 1 1 0 8 0 amappl12 168 2372 0 2334 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 46 0 36 1 0 1 1 0 8 0 amappl9 144 278 0 278 1 1 0 1 0 8 0 amappl8 136 40 0 39 1 0 1 1 0 8 0 amappl7 128 120 0 119 1 0 1 1 0 8 0 amappl6 120 317 0 306 1 0 1 1 0 8 0 amappl5 112 87 0 79 1 0 1 1 0 8 0 amappl4 104 411 0 385 1 0 1 1 0 8 0 amappl3 96 11728 0 11628 4 0 4 4 0 8 0 amappl2 88 585 0 528 2 0 2 2 0 8 0 amappl1 80 16673 0 16143 13 1 12 13 0 8 0 amappl 88 15711 0 15557 5 0 5 5 0 92 0 uvmvnodes 80 158 0 0 4 0 4 4 0 8 0 dma4096 4096 2 0 2 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 8 0 8 2 1 1 1 0 8 1 dma128 128 256 0 256 1 1 0 1 0 8 0 dma64 64 7 0 7 1 1 0 1 0 8 0 dma32 32 9 0 9 2 1 1 1 0 8 1 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 53 0 11 1 0 1 1 0 8 0 uaddrrnd 24 1995 0 1965 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1995 0 1965 1 0 1 1 0 8 0 vmmpekpl 168 16006 0 15967 3 0 3 3 0 8 0 vmmpepl 168 129911 0 128112 102 10 92 101 0 357 12 vmsppl 368 1994 0 1965 4 1 3 4 0 8 0 rwobjpl 40 34499 0 33468 16 2 14 16 0 8 0 pdppl 4096 4013 0 3941 121 49 72 79 0 8 0 pvpl 32 889065 0 880634 177 63 114 175 0 265 14 pmappl 216 2002 0 1968 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 481 0 140 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7dc010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837aba40,ffff80002a7b9800) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7b9800,0) 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: 0x73d319205da0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7dc010) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837aba40,ffff80002a7b9800) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7b9800,0) 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: 0x73d319205da0, count: -7