uvm_fault(0xffffffff82bcbd30, 0xffff8000211f3000, 0, 2) -> e kernel: page fault trap, code=0 Stopped at kcov_remote_enter+0x112: movq $0,0(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *337633 13173 0 0 0 0 syz-executor.3 kcov_remote_enter(0,ffff8000fffeefd0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff80002b423140) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff80002b423140,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffffb660, count: 9 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(0xffffffff82bcbd30, 0xffff8000211f3000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff8000fffeefd0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff80002b423140) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff80002b423140,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffffb660, count: -6 ddb> show registers rdi 0x4 rsi 0xffff8000006b4a00 rbp 0xffff80002174a360 rbx 0 rdx 0xffff80002b422858 rcx 0xffff8000211f3000 rax 0xfffffd8067767c60 r8 0 r9 0 r10 0x68e82c547c549444 r11 0x506a23b9f971a9f8 r12 0xffff80002b423080 r13 0xffffffff82b9dff0 cpu_info_full_primary+0x1ff0 r14 0xffff8000fffeefd0 r15 0 rip 0xffffffff819ddc22 kcov_remote_enter+0x112 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002174a340 ss 0 kcov_remote_enter+0x112: movq $0,0(%rcx) ddb> show proc PROC (syz-executor.3) pid=337633 stat=onproc flags process=0 proc=0 pri=83, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002b422b10,0xffff80002b4238b8 process=0xffff80002e8367e0 user=0xffff800021745000, vmspace=0xfffffd8069b5f570 estcpu=36, cpticks=3, pctcpu=0.0 user=1, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 94842 309179 8121 0 2 0 syz-executor.5 13818 49342 57942 0 2 0 syz-executor.6 13818 235818 57942 0 2 0x4000000 syz-executor.6 *13173 337633 12832 0 7 0 syz-executor.3 13173 140941 12832 0 3 0x4000080 tunread syz-executor.3 54878 385321 13511 0 2 0 syz-executor.7 54878 70551 13511 0 3 0x4000080 fsleep syz-executor.7 85560 504898 75826 0 2 0 syz-executor.0 85560 368720 75826 0 2 0x4000000 syz-executor.0 74899 4889 5665 0 2 0 syz-executor.2 74899 364316 5665 0 3 0x4000080 fsleep syz-executor.2 57942 169194 71327 0 3 0x82 nanoslp syz-executor.6 75826 443912 71327 0 3 0x82 nanoslp syz-executor.0 8121 149688 71327 0 3 0x82 nanoslp syz-executor.5 12832 167771 71327 0 3 0x82 nanoslp syz-executor.3 5665 336429 71327 0 3 0x82 nanoslp syz-executor.2 91155 347456 71327 0 3 0x82 nanoslp syz-executor.1 13511 405272 71327 0 3 0x82 nanoslp syz-executor.7 2090 443418 0 0 3 0x14200 bored sosplice 93821 207441 71327 0 2 0x2 syz-executor.4 71327 185570 28849 0 3 0x82 wait syz-fuzzer 71327 95764 28849 0 3 0x4000082 nanoslp syz-fuzzer 71327 208517 28849 0 3 0x4000082 thrsleep syz-fuzzer 71327 451175 28849 0 3 0x4000082 thrsleep syz-fuzzer 71327 77613 28849 0 3 0x4000082 wait syz-fuzzer 71327 245080 28849 0 3 0x4000082 wait syz-fuzzer 71327 32108 28849 0 3 0x4000082 thrsleep syz-fuzzer 71327 390228 28849 0 3 0x4000082 kqread syz-fuzzer 71327 242634 28849 0 3 0x4000082 wait syz-fuzzer 71327 297223 28849 0 3 0x4000082 wait syz-fuzzer 71327 346364 28849 0 3 0x4000082 thrsleep syz-fuzzer 71327 90587 28849 0 3 0x4000082 wait syz-fuzzer 71327 386523 28849 0 3 0x4000082 wait syz-fuzzer 71327 175139 28849 0 3 0x4000082 wait syz-fuzzer 28849 248414 12210 0 3 0x10008a sigsusp ksh 12210 430332 17373 0 3 0x9a kqread sshd 4916 430518 1 0 3 0x100083 ttyin getty 17373 378148 1 0 3 0x88 kqread sshd 51815 358782 9728 73 3 0x1100090 kqread syslogd 9728 184080 1 0 3 0x100082 netio syslogd 12813 270498 1 0 3 0x100080 kqread resolvd 60712 237627 32147 77 3 0x100092 kqread dhcpleased 80884 453075 32147 77 3 0x100092 kqread dhcpleased 32147 305830 1 0 3 0x80 kqread dhcpleased 19261 254247 0 0 3 0x14200 bored smr 93643 301318 0 0 2 0x14200 zerothread 63318 35419 0 0 3 0x14200 aiodoned aiodoned 90301 382897 0 0 3 0x14200 syncer update 82302 289769 0 0 3 0x14200 cleaner cleaner 40318 307807 0 0 3 0x14200 reaper reaper 57530 109399 0 0 3 0x14200 pgdaemon pagedaemon 96706 10397 0 0 3 0x14200 bored viomb 85809 339355 0 0 3 0x40014200 acpi0 acpi0 80239 168212 0 0 3 0x14200 bored softnet 26038 122761 0 0 3 0x14200 bored softnet 32896 412379 0 0 3 0x14200 bored softnet 30200 8373 0 0 3 0x14200 bored softnet 20923 66546 0 0 3 0x14200 bored systqmp 15993 314557 0 0 3 0x14200 bored systq 58403 122205 0 0 3 0x40014200 bored softclock 13423 279739 0 0 3 0x40014200 idle0 1 324788 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 10237 6488K 7235K 78643K 28801 0 pcb 13 18K 22K 78643K 1076 0 rtable 180 15K 16K 78643K 1744 0 ifaddr 82 23K 24K 78643K 460 0 sysctl 2 0K 0K 78643K 2 0 counters 28 17K 17K 78643K 176 0 ioctlops 0 0K 2K 78643K 472 0 iov 0 0K 40K 78643K 554 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1498 94K 94K 78643K 6918 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 36 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1388 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 69K 78643K 5270 0 sigio 0 0K 0K 78643K 134 0 proc 58 59K 75K 78643K 1103 0 subproc 104 6K 6K 78643K 338 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 660 0 in_multi 72 4K 6K 78643K 447 0 ether_multi 1 0K 0K 78643K 53 0 mrt 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 235 1049K 1049K 78643K 235 0 exec 0 0K 1K 78643K 1096 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 290 87K 103K 78643K 34410 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 223 0 NDP 13 0K 2K 78643K 128 0 temp 133 5770K 6798K 78643K 82029 0 kqueue 13 20K 28K 78643K 592 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 624 0 621 11 10 1 4 0 8 0 rtentry 112 381 0 306 4 0 4 4 0 8 0 unpcb 144 5016 0 5003 38 37 1 6 0 8 0 syncache 296 37 0 37 7 7 0 1 0 8 0 tcpqe 32 145 0 145 5 5 0 1 0 8 0 tcpcb 776 1756 0 1752 54 53 1 14 0 8 0 arp 88 63 0 51 1 0 1 1 0 8 0 ipq 40 5 0 4 2 1 1 1 0 8 0 ipqe 40 6 0 4 2 1 1 1 0 8 0 inpcb 336 6154 0 6147 79 72 7 13 0 8 6 nd6 48 85 0 68 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 kcovpl 48 26 0 18 1 0 1 1 0 8 0 mppekey 1024 4 0 4 1 1 0 1 0 8 0 ppxss 1160 100 0 100 6 5 1 1 0 8 1 pppxif 1360 16 0 16 4 3 1 1 0 8 1 pfstscr 40 81 0 74 1 0 1 1 0 8 0 pfosfp 40 3 0 2 1 0 1 1 0 8 0 pfosfpen 112 3 0 2 1 0 1 1 0 8 0 pfanchor 1280 8 0 0 1 0 1 1 0 8 0 pfstitem 24 55 0 41 1 0 1 1 0 8 0 pfstkey 128 127 0 89 2 0 2 2 0 8 0 pfstate 352 81 0 74 1 0 1 1 0 8 0 art_heap8 4096 4 0 3 4 3 1 2 0 8 0 art_heap4 256 1704 0 1341 37 14 23 29 0 8 0 art_table 32 1708 0 1344 4 0 4 4 0 8 0 art_node 16 380 0 315 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 18 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 1384 0 1374 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 8176 0 6738 90 0 90 90 0 8 0 ffsino 240 8176 0 6738 85 0 85 85 0 8 0 nchpl 144 16656 0 15015 63 0 63 63 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 59104 0 59104 7 6 1 2 0 8 1 vmpool 664 18 0 18 5 5 0 1 0 8 0 kstatmem 264 144 0 118 3 1 2 3 0 8 0 scxspl 216 42691 0 42691 21 20 1 8 0 8 1 plimitpl 152 456 0 441 1 0 1 1 0 8 0 sigapl 424 5590 0 5545 8 1 7 8 0 8 0 futexpl 64 61039 0 61037 3 2 1 1 0 8 0 knotepl 120 76204 0 76123 47 40 7 11 0 8 4 kqueuepl 184 2229 0 2220 17 16 1 4 0 8 0 pipepl 288 1538 0 1510 36 29 7 11 0 8 4 fdescpl 432 5512 0 5485 4 0 4 4 0 8 0 filepl 120 45253 0 45015 63 49 14 16 0 8 6 lockfpl 104 1178 0 1176 3 2 1 2 0 8 0 lockfspl 48 312 0 310 1 0 1 1 0 8 0 sessionpl 144 41 0 25 1 0 1 1 0 8 0 pgrppl 48 93 0 77 1 0 1 1 0 8 0 ucredpl 104 4626 0 4615 1 0 1 1 0 8 0 zombiepl 144 5546 0 5545 3 2 1 1 0 8 0 processpl 1008 5590 0 5545 10 3 7 9 0 8 0 procpl 696 12893 0 12830 13 5 8 10 0 8 0 sosppl 168 31 0 31 6 6 0 1 0 8 0 sockpl 456 11797 0 11774 244 233 11 28 0 8 8 mcl64k 65536 162 0 162 10 9 1 1 0 8 1 mcl16k 16384 90 0 90 9 9 0 1 0 8 0 mcl12k 12288 163 0 163 10 9 1 1 0 8 1 mcl9k 9216 62 0 62 12 12 0 1 0 8 0 mcl8k 8192 244 0 244 12 11 1 1 0 8 1 mcl4k 4096 726 0 725 7 6 1 1 0 8 0 mcl2k2 2112 131 0 131 8 7 1 1 0 8 1 mcl2k 2048 85918 0 85833 43 31 12 33 0 8 0 mtagpl 96 2530 0 2218 26 8 18 24 0 8 0 mbufpl 256 193635 0 193137 466 403 63 113 0 8 0 bufpl 288 12174 0 5780 457 0 457 457 0 8 0 anonpl 24 1050298 0 1035770 161 51 110 130 0 188 2 amapchunkpl 152 111298 0 110640 90 56 34 42 0 158 5 amappl16 200 10059 0 9470 61 26 35 45 0 8 3 amappl15 192 12 0 11 1 0 1 1 0 8 0 amappl14 184 222 0 210 2 1 1 2 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 625 0 623 1 0 1 1 0 8 0 amappl11 160 48 0 38 1 0 1 1 0 8 0 amappl10 152 57 0 47 1 0 1 1 0 8 0 amappl9 144 979 0 977 1 0 1 1 0 8 0 amappl8 136 233 0 169 3 0 3 3 0 8 0 amappl7 128 182 0 159 2 0 2 2 0 8 0 amappl6 120 255 0 244 2 1 1 2 0 8 0 amappl5 112 244 0 238 1 0 1 1 0 8 0 amappl4 104 703 0 674 2 1 1 2 0 8 0 amappl3 96 15025 0 14976 2 0 2 2 0 8 0 amappl2 88 6089 0 6020 3 1 2 3 0 8 0 amappl1 80 123464 0 122768 28 12 16 26 0 8 0 amappl 88 33622 0 33455 5 0 5 5 0 92 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 128 253 0 253 1 1 0 1 0 8 0 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 5530 0 5503 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5530 0 5503 1 0 1 1 0 8 0 vmmpekpl 168 45501 0 45450 3 0 3 3 0 8 0 vmmpepl 168 504411 0 501729 257 115 142 156 0 357 16 vmsppl 344 5529 0 5503 3 0 3 3 0 8 0 rwobjpl 24 132285 0 124570 53 5 48 49 0 8 0 pdppl 4096 11066 0 11006 337 273 64 66 0 8 4 pvpl 32 2093000 0 2073220 402 209 193 359 0 265 1 pmappl 216 5529 0 5503 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1690 0 872 25 0 25 25 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff8000fffeefd0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff80002b423140) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff80002b423140,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffffb660, count: -6 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff8000fffeefd0) at kcov_remote_enter+0x112 sys/dev/kcov.c:672 timeout_run(ffff80002b423140) at timeout_run+0x80 sys/kern/kern_timeout.c:639 softclock_process_tick_timeout(ffff80002b423140,0) at softclock_process_tick_timeout+0x1ac sys/kern/kern_timeout.c:688 softclock(0) at softclock+0x130 sys/kern/kern_timeout.c:711 softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffffb660, count: -6