uvm_fault(0xffffffff8397c948, 0xffff800029ef6000, 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 *304129 7955 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746d98,0) 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 writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71f2053a190, count: 1 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(0xffffffff8397c948, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746d98,0) 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 writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71f2053a190, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003b4fd700 rbx 0xffff80002a7afa90 rdx 0xffff8000380d9780 rcx 0xffff800029ef6000 rax 0xfffffd806cd01c60 r8 0xffff80003b4fd888 r9 0 r10 0xfe595a91d78fc631 r11 0x23e76450fbb675f r12 0xffffffff814aa960 endtsleep r13 0xffff80002a746d00 r14 0xffff80002a7afa90 r15 0 rip 0xffffffff831cf702 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003b4fd6e0 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=304129 pid=7955 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a788fa0,0xffffffff8393ebf0 process=0xffff8000ffff8d98 user=0xffff80003b4f8000, vmspace=0xfffffd806bf04748 estcpu=20, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 7955 357439 20541 0 2 0 syz-executor * 7955 304129 20541 0 7 0x4000000 syz-executor 99264 413802 12833 0 3 0x90 nanoslp syz-executor 99264 455873 12833 0 3 0x4000090 netacc syz-executor 99264 78773 12833 0 3 0x4000090 fsleep syz-executor 2220 320257 28667 0 3 0x3000 suspend syz-executor 2220 236079 28667 0 2 0x4081000 syz-executor 2220 10229 28667 0 3 0x4081000 inode syz-executor 28683 389647 61968 0 3 0x80 nanoslp syz-executor 28683 275649 61968 0 3 0x4000080 lockf syz-executor 28683 351466 61968 0 3 0x4000080 fsleep syz-executor 17949 324759 31914 0 3 0x80 nanoslp syz-executor 17949 32833 31914 0 3 0x4000080 kqread syz-executor 17949 80801 31914 0 3 0x4000080 fsleep syz-executor 4711 74899 75591 -1 3 0x90 nanoslp syz-executor 4711 472856 75591 -1 3 0x4000090 kqread syz-executor 4711 439087 75591 -1 3 0x4000090 fsleep syz-executor 52988 98471 0 0 3 0x14200 acct acct 57767 386779 1 0 3 0x100083 ttyin getty 28667 507884 46026 0 3 0x82 nanoslp syz-executor 12833 110236 46026 0 3 0x82 nanoslp syz-executor 19079 210446 46026 0 3 0x82 wait syz-executor 20541 517555 46026 0 3 0x82 nanoslp syz-executor 61968 226980 46026 0 3 0x82 nanoslp syz-executor 75591 150253 46026 0 3 0x82 nanoslp syz-executor 31914 318560 46026 0 3 0x82 nanoslp syz-executor 98106 476356 46026 0 3 0x82 nanoslp syz-executor 46026 35233 47508 0 3 0x82 kqread syz-executor 47508 479461 57717 0 3 0x10008a sigsusp ksh 57717 12947 66033 0 3 0x98 kqread sshd-session 66033 427310 76086 0 3 0x92 kqread sshd-session 76086 222340 1 0 3 0x88 kqread sshd 27172 114252 15562 73 3 0x1100090 kqread syslogd 15562 21898 1 0 3 0x100082 sbwait syslogd 65968 325327 1 0 3 0x100080 kqread resolvd 93965 32799 27294 77 3 0x100092 kqread dhcpleased 81890 389205 27294 77 3 0x100092 kqread dhcpleased 27294 289074 1 0 3 0x80 kqread dhcpleased 45985 402091 0 0 3 0x14200 bored smr 87825 484366 0 0 2 0x14200 zerothread 17188 501173 0 0 3 0x14200 aiodoned aiodoned 41465 223061 0 0 3 0x14200 syncer update 26186 333835 0 0 3 0x14200 cleaner cleaner 64516 508052 0 0 3 0x14200 reaper reaper 79356 344660 0 0 3 0x14200 pgdaemon pagedaemon 8510 112532 0 0 3 0x14200 bored viomb 86666 85697 0 0 3 0x40014200 acpi0 acpi0 11468 423264 0 0 3 0x14200 bored softnet0 90950 370830 0 0 3 0x14200 bored systqmp 14567 133210 0 0 3 0x14200 bored systq 64192 392405 0 0 3 0x40014200 tmoslp softclock 53385 133433 0 0 3 0x40014200 idle0 1 402671 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 11064 12115K 12452K 166960K 12978 0 pcb 17 14K 16K 166960K 218 0 rtable 238 8K 8K 166960K 406 0 pf 31 13K 13K 166960K 48 0 ifaddr 39 6K 7K 166960K 56 0 ifgroup 48 2K 2K 166960K 71 0 sysctl 4 1K 9K 166960K 11 0 counters 35 17K 18K 166960K 48 0 ioctlops 1 2K 4K 166960K 141 0 iov 0 0K 16K 166960K 14 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1364 86K 86K 166960K 1749 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 447 0 sigio 0 0K 0K 166960K 14 0 proc 60 59K 124K 166960K 525 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 23 0 in_multi 88 6K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 392 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 237 160K 176K 166960K 5646 0 UVM aobj 19 4K 4K 166960K 19 0 pinsyscall 39 78K 96K 166960K 1552 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 18 0 NDP 11 0K 2K 166960K 35 0 temp 46 9064K 9128K 166960K 20824 0 kqueue 15 24K 32K 166960K 83 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 95 0 92 2 0 2 2 0 8 1 rtentry 136 121 0 17 4 0 4 4 0 8 0 unpcb 144 273 0 256 4 0 4 4 0 8 3 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 109 0 100 1 0 1 1 0 8 0 arp 96 18 0 2 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 3 0 2 1 0 1 1 0 8 0 inpcb 328 388 0 374 7 0 7 7 0 8 5 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 29 0 4 1 0 1 1 0 8 0 pkpcb 40 7 0 7 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 13 0 10 1 0 1 1 0 8 0 pppxif 1416 2 0 2 1 0 1 1 0 8 1 pfsrclim 320 2 0 2 1 0 1 1 0 8 1 pfstkey 128 2 0 2 1 0 1 1 0 8 1 pfstate 384 1 0 1 1 0 1 1 0 8 1 pfrule 1360 1 0 1 1 0 1 1 0 8 1 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 469 0 52 29 0 29 29 0 8 1 art_table 40 471 0 52 5 0 5 5 0 8 0 art_node 32 120 0 25 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 16 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2158 0 700 92 0 92 92 0 8 0 ffsino 256 2158 0 700 92 0 92 92 0 8 0 nchpl 144 2788 0 1088 64 0 64 64 0 8 0 rtmask 32 5 0 3 1 0 1 1 0 8 0 vnodes 216 2507 0 0 140 0 140 140 0 8 0 namei 1024 9527 0 9527 2 0 2 2 0 8 2 kstatmem 264 38 0 16 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 15357 0 15357 3 0 3 3 1 8 3 plimitpl 152 152 0 134 1 0 1 1 0 8 0 sigapl 424 743 0 699 6 0 6 6 0 8 0 knotepl 120 15274 0 15222 16 0 16 16 0 8 13 kqueuepl 184 152 0 139 3 0 3 3 0 8 2 pipepl 304 198 0 171 3 0 3 3 0 8 0 fdescpl 448 729 0 699 5 0 5 5 0 8 1 filepl 120 4184 0 3959 11 0 11 11 0 8 3 lockfpl 104 152 0 147 1 0 1 1 0 8 0 lockfspl 48 68 0 65 1 0 1 1 0 8 0 sessionpl 144 34 0 26 1 0 1 1 0 8 0 pgrppl 48 45 0 29 1 0 1 1 0 8 0 ucredpl 104 576 0 562 1 0 1 1 0 8 0 zombiepl 144 702 0 699 1 0 1 1 0 8 0 processpl 1152 743 0 699 4 0 4 4 0 8 0 procpl 664 1215 0 1160 6 0 6 6 0 8 1 sockpl 552 828 0 794 12 1 11 12 0 8 8 mcl64k 65536 15 0 15 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 71 0 71 1 0 1 1 0 8 1 mcl4k 4096 2932 0 2880 13 0 13 13 0 8 6 mcl2k 2048 452 0 449 1 0 1 1 0 8 0 mtagpl 96 24 0 5 1 0 1 1 0 8 0 mbufpl 256 7344 0 7171 13 0 13 13 0 8 1 bufpl 280 6245 0 102 439 0 439 439 0 8 0 anonpl 24 144968 0 138245 57 0 57 57 0 187 16 amapchunkpl 152 18458 0 17814 28 0 28 28 0 158 3 amappl16 200 2954 0 2837 15 0 15 15 0 8 4 amappl15 192 15 0 15 1 0 1 1 0 8 1 amappl14 184 408 0 407 1 0 1 1 0 8 0 amappl13 176 122 0 112 1 0 1 1 0 8 0 amappl12 168 971 0 941 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 0 1 1 0 8 1 amappl10 152 62 0 52 1 0 1 1 0 8 0 amappl9 144 267 0 267 1 0 1 1 0 8 1 amappl8 136 105 0 103 1 0 1 1 0 8 0 amappl7 128 147 0 135 1 0 1 1 0 8 0 amappl6 120 148 0 146 1 0 1 1 0 8 0 amappl5 112 99 0 90 1 0 1 1 0 8 0 amappl4 104 266 0 251 1 0 1 1 0 8 0 amappl3 96 3415 0 3296 4 0 4 4 0 8 0 amappl2 88 599 0 544 2 0 2 2 0 8 0 amappl1 80 11310 0 10751 16 0 16 16 0 8 3 amappl 88 4879 0 4707 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 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 18 0 0 1 0 1 1 0 8 0 uaddrrnd 24 729 0 699 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 729 0 699 1 0 1 1 0 8 0 vmmpekpl 168 7657 0 7632 2 0 2 2 0 8 0 vmmpepl 168 55207 0 53259 104 0 104 104 0 357 13 vmsppl 368 728 0 699 4 0 4 4 0 8 1 rwobjpl 40 18407 0 17324 15 0 15 15 0 8 1 pdppl 4096 1464 0 1398 100 30 70 82 0 8 4 pvpl 32 351324 0 338937 134 0 134 134 0 265 28 pmappl 216 728 0 699 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 365 0 30 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746d98,0) 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 writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71f2053a190, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746d98,0) 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 writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71f2053a190, count: -14