uvm_fault(0xffffffff83a99f70, 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 *381273 26252 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a79cd90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838f9da0,ffff80002a7780a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7780a8,0) 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,ffffffff81739530,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015f4000,3,ffff80003c8fb4e0) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd8063075e78,84946467,ffff8000015f4000,3,fffffd8007ffd340,ffff80003c8fb4e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8065bf0698,84946467,ffff8000015f4000,ffff80003c8fb4e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80003c8fb4e0,ffff80003c907b90,ffff80003c907ae0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c907b90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c907b90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7815dce2660, 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(0xffffffff83a99f70, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a79cd90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838f9da0,ffff80002a7780a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7780a8,0) 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,ffffffff81739530,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015f4000,3,ffff80003c8fb4e0) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd8063075e78,84946467,ffff8000015f4000,3,fffffd8007ffd340,ffff80003c8fb4e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8065bf0698,84946467,ffff8000015f4000,ffff80003c8fb4e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80003c8fb4e0,ffff80003c907b90,ffff80003c907ae0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c907b90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c907b90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7815dce2660, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c907500 rbx 0xffff80002a79cd90 rdx 0xffff80003c8fb4e0 rcx 0xffff800029ee6000 rax 0xfffffd806cad4f00 r8 0xffff80003c907688 r9 0 r10 0x7964d5958ca720cf r11 0xe720d8d3ebaecec0 r12 0xffffffff8106c5a0 endtsleep r13 0xffff80002a778010 r14 0xffff80002a79cd90 r15 0 rip 0xffffffff81ddf272 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c9074e0 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=381273 pid=26252 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c8fa2b8,0xffff80003a4d8038 process=0xffff8000ffffa898 user=0xffff80003c902000, vmspace=0xfffffd806ca9f2f8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 52375 316218 40473 0 2 0 syz-executor 52375 283843 40473 0 3 0x4000080 fsleep syz-executor 11412 78755 81561 0 2 0 syz-executor 11412 441529 81561 0 3 0x4000080 fsleep syz-executor 5513 213321 10813 0 2 0 syz-executor 5513 254265 10813 0 3 0x4000080 fsleep syz-executor 12359 413796 77893 0 2 0 syz-executor 12359 95607 77893 0 3 0x4000080 fsleep syz-executor 72861 388697 89707 0 2 0 syz-executor 72861 329039 89707 0 3 0x4000080 fsleep syz-executor 26252 199058 47206 0 2 0 syz-executor *26252 381273 47206 0 7 0x4000000 syz-executor 65078 23970 73972 0 2 0xc80 syz-executor 65078 243030 73972 0 3 0x4000080 ttyout syz-executor 65078 245064 73972 0 3 0x4000080 ttyout syz-executor 65078 26089 73972 0 3 0x4000080 fsleep syz-executor 59296 115231 0 0 3 0x14200 acct acct 81561 230965 19814 0 3 0x82 nanoslp syz-executor 89707 71693 19814 0 3 0x82 nanoslp syz-executor 77893 161854 19814 0 3 0x82 nanoslp syz-executor 10813 478915 19814 0 3 0x82 nanoslp syz-executor 40473 306889 19814 0 3 0x82 nanoslp syz-executor 86463 247112 19814 0 2 0x2 syz-executor 47206 79857 19814 0 3 0x82 nanoslp syz-executor 73972 460777 19814 0 3 0x82 nanoslp syz-executor 19814 484036 1 0 3 0x82 kqread syz-executor 67449 500679 24361 0 3 0x98 kqread sshd-session 24361 82612 70919 0 3 0x92 kqread sshd-session 31702 335685 1 0 3 0x100083 ttyin getty 70919 21431 1 0 3 0x88 kqread sshd 16413 105920 66976 73 3 0x1100090 kqread syslogd 66976 417479 1 0 3 0x100082 sbwait syslogd 83731 476288 1 0 3 0x100080 kqread resolvd 2269 464974 80386 77 3 0x100092 kqread dhcpleased 76101 304816 80386 77 3 0x100092 kqread dhcpleased 80386 343595 1 0 3 0x80 kqread dhcpleased 76801 352061 0 0 3 0x14200 bored smr 37857 128 0 0 2 0x14200 zerothread 94483 435133 0 0 3 0x14200 aiodoned aiodoned 8695 366794 0 0 3 0x14200 syncer update 24740 53894 0 0 3 0x14200 cleaner cleaner 43890 497535 0 0 3 0x14200 reaper reaper 7731 451696 0 0 3 0x14200 pgdaemon pagedaemon 26016 214457 0 0 3 0x14200 bored viomb 59887 69611 0 0 3 0x40014200 acpi0 acpi0 26922 411178 0 0 3 0x14200 bored softnet0 31097 260611 0 0 3 0x14200 bored systqmp 49529 27015 0 0 3 0x14200 bored systq 36966 126718 0 0 3 0x40014200 tmoslp softclock 66288 421660 0 0 3 0x40014200 idle0 1 137726 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 11058 12103K 12313K 166960K 12461 0 pcb 21 12K 12K 166960K 98 0 rtable 194 7K 8K 166960K 442 0 pf 28 12K 20K 166960K 59 0 ifaddr 34 6K 7K 166960K 55 0 ifgroup 42 1K 2K 166960K 70 0 sysctl 4 1K 9K 166960K 9 0 counters 31 17K 17K 166960K 39 0 ioctlops 1 2K 4K 166960K 250 0 iov 0 0K 12K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1320 83K 84K 166960K 1655 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 467 0 sigio 0 0K 0K 166960K 4 0 proc 60 59K 83K 166960K 555 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 124 0 in_multi 77 5K 7K 166960K 124 0 ether_multi 2 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 22 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 2K 166960K 406 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 217 144K 169K 166960K 5985 0 UVM aobj 16 2K 2K 166960K 16 0 pinsyscall 37 74K 96K 166960K 1584 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 40 0 NDP 9 0K 2K 166960K 34 0 temp 47 9097K 9161K 166960K 15506 0 kqueue 14 22K 26K 166960K 59 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 96 0 93 1 0 1 1 0 8 0 rtentry 136 133 0 52 4 0 4 4 0 8 0 unpcb 144 387 0 372 6 0 6 6 0 8 5 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 141 0 137 4 3 1 4 0 8 0 arp 96 22 0 7 1 0 1 1 0 8 0 ipq 40 6 0 0 1 0 1 1 0 8 0 ipqe 40 6 0 0 1 0 1 1 0 8 0 inpcb 328 403 0 387 5 3 2 4 0 8 0 ip6q 72 4 0 0 1 0 1 1 0 8 0 ip6af 40 4 0 0 1 0 1 1 0 8 0 nd6 112 31 0 11 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 2 0 2 1 0 1 1 0 8 1 pfstscr 40 9 0 3 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 9 0 6 1 0 1 1 0 8 0 pfstkey 128 9 0 2 1 0 1 1 0 8 0 pfstate 384 5 0 2 1 0 1 1 0 8 0 pfrule 1360 6 0 6 2 1 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 256 538 0 180 29 2 27 29 0 8 2 art_table 40 540 0 180 5 0 5 5 0 8 0 art_node 32 132 0 59 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 6 2 1 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 13 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2137 0 679 92 0 92 92 0 8 0 ffsino 256 2137 0 679 92 0 92 92 0 8 0 nchpl 144 2769 0 1074 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 2418 0 0 135 0 135 135 0 8 0 namei 1024 8665 0 8664 2 1 1 2 0 8 0 kstatmem 264 33 0 14 2 0 2 2 0 8 0 scxspl 216 16372 0 16372 10 7 3 8 1 8 3 plimitpl 152 69 0 53 1 0 1 1 0 8 0 sigapl 424 761 0 719 6 1 5 6 0 8 0 knotepl 120 15283 0 15231 23 14 9 17 0 8 6 kqueuepl 184 91 0 80 1 0 1 1 0 8 0 pipepl 304 129 0 102 3 0 3 3 0 8 0 fdescpl 448 745 0 717 5 1 4 5 0 8 0 filepl 120 3696 0 3472 14 2 12 12 0 8 4 lockfpl 104 103 0 100 1 0 1 1 0 8 0 lockfspl 48 44 0 41 1 0 1 1 0 8 0 sessionpl 144 35 0 27 1 0 1 1 0 8 0 pgrppl 48 47 0 31 1 0 1 1 0 8 0 ucredpl 104 491 0 479 1 0 1 1 0 8 0 zombiepl 144 854 0 854 1 0 1 1 0 8 1 processpl 1152 761 0 719 4 0 4 4 0 8 0 procpl 664 1282 0 1231 6 0 6 6 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 901 0 867 14 3 11 12 0 8 8 mcl64k 65536 20 0 19 1 0 1 1 0 8 0 mcl16k 16384 13 0 13 2 1 1 1 0 8 1 mcl12k 12288 1 0 1 1 1 0 1 0 8 0 mcl9k128 9344 2 0 2 2 1 1 1 0 8 1 mcl8k 8192 8 0 8 2 1 1 1 0 8 1 mcl4k 4096 2965 0 2912 16 7 9 15 0 8 0 mcl2k 2048 476 0 472 4 2 2 2 0 8 1 mtagpl 96 5 0 5 2 1 1 1 0 8 1 mbufpl 256 7838 0 7663 15 0 15 15 0 8 2 bufpl 280 6587 0 374 445 0 445 445 0 8 0 anonpl 24 138014 0 134966 80 0 80 80 0 186 30 amapchunkpl 152 19671 0 19018 41 0 41 41 0 158 12 amappl16 200 2607 0 2583 34 20 14 34 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 421 0 421 1 0 1 1 0 8 1 amappl13 176 113 0 103 1 0 1 1 0 8 0 amappl12 168 989 0 962 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 60 0 49 1 0 1 1 0 8 0 amappl9 144 260 0 260 1 1 0 1 0 8 0 amappl8 136 109 0 108 1 0 1 1 0 8 0 amappl7 128 222 0 211 1 0 1 1 0 8 0 amappl6 120 157 0 157 1 0 1 1 0 8 1 amappl5 112 90 0 82 1 0 1 1 0 8 0 amappl4 104 261 0 247 1 0 1 1 0 8 0 amappl3 96 3568 0 3459 4 0 4 4 0 8 0 amappl2 88 513 0 457 2 0 2 2 0 8 0 amappl1 80 10390 0 9849 13 1 12 13 0 8 0 amappl 88 5230 0 5075 5 0 5 5 0 92 0 uvmvnodes 80 114 0 0 3 0 3 3 0 8 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 8 0 8 2 1 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 15 0 0 1 0 1 1 0 8 0 uaddrrnd 24 745 0 717 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 745 0 717 1 0 1 1 0 8 0 vmmpekpl 168 7425 0 7391 2 0 2 2 0 8 0 vmmpepl 168 54047 0 52307 107 0 107 107 0 357 22 vmsppl 368 744 0 717 4 1 3 4 0 8 0 rwobjpl 40 17588 0 16638 16 0 16 16 0 8 1 pdppl 4096 1496 0 1434 98 34 64 82 0 8 2 pvpl 32 349524 0 341113 162 0 162 162 0 265 53 pmappl 216 744 0 717 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 378 0 57 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a79cd90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838f9da0,ffff80002a7780a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7780a8,0) 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,ffffffff81739530,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015f4000,3,ffff80003c8fb4e0) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd8063075e78,84946467,ffff8000015f4000,3,fffffd8007ffd340,ffff80003c8fb4e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8065bf0698,84946467,ffff8000015f4000,ffff80003c8fb4e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80003c8fb4e0,ffff80003c907b90,ffff80003c907ae0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c907b90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c907b90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7815dce2660, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a79cd90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838f9da0,ffff80002a7780a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7780a8,0) 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,ffffffff81739530,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015f4000,3,ffff80003c8fb4e0) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd8063075e78,84946467,ffff8000015f4000,3,fffffd8007ffd340,ffff80003c8fb4e0) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8065bf0698,84946467,ffff8000015f4000,ffff80003c8fb4e0) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80003c8fb4e0,ffff80003c907b90,ffff80003c907ae0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c907b90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c907b90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7815dce2660, count: -14