uvm_fault(0xffffffff83aa1d70, 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 * 36221 97818 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a7660a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7660a8,0) 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,ffffffff83064980,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015e7000,3,ffff80002f8b0018) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd805c679eb8,84946467,ffff8000015e7000,3,fffffd8007ffd820,ffff80002f8b0018) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cdb7bd0,84946467,ffff8000015e7000,ffff80002f8b0018) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f8b0018,ffff80003c91dbc0,ffff80003c91db10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c91dbc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c91dbc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9e77815fe30, 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(0xffffffff83aa1d70, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a7660a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7660a8,0) 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,ffffffff83064980,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015e7000,3,ffff80002f8b0018) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd805c679eb8,84946467,ffff8000015e7000,3,fffffd8007ffd820,ffff80002f8b0018) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cdb7bd0,84946467,ffff8000015e7000,ffff80002f8b0018) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f8b0018,ffff80003c91dbc0,ffff80003c91db10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c91dbc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c91dbc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9e77815fe30, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c91d530 rbx 0xffff80002a79c910 rdx 0xffff80002f8b0018 rcx 0xffff800029ee6000 rax 0xfffffd806cad2f30 r8 0xffff80003c91d6b8 r9 0 r10 0x1c09d108281c69c4 r11 0xbe6189f0cc9cb61f r12 0xffffffff8246cba0 endtsleep r13 0xffff80002a766010 r14 0xffff80002a79c910 r15 0 rip 0xffffffff82724642 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c91d510 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=36221 pid=97818 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=67, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f8b07e0,0xffff80002a749260 process=0xffff8000ffffba98 user=0xffff80003c918000, vmspace=0xfffffd806cac8010 estcpu=17, cpticks=3, pctcpu=0.0, user=0, sys=2, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 30130 28292 25272 0 3 0x80 fsleep syz-executor 30130 62531 25272 0 3 0x4000080 msgwait syz-executor 97818 498462 88125 0 2 0 syz-executor *97818 36221 88125 0 7 0x4000000 syz-executor 4642 514781 63322 -1 3 0x90 nanoslp syz-executor 4642 87114 63322 -1 3 0x4000090 sbwait syz-executor 4642 283223 63322 -1 3 0x4000090 fsleep syz-executor 39156 339509 97368 0 3 0x80 fsleep syz-executor 39156 501077 97368 0 3 0x4000088 kqpoll syz-executor 88829 432109 1880 0 3 0x80 fsleep syz-executor 88829 50019 1880 0 3 0x4000080 fifow syz-executor 94288 360399 54031 0 3 0x80 fsleep syz-executor 94288 267823 54031 0 3 0x4000080 sbwait syz-executor 39557 304810 62968 0 3 0x80 fsleep syz-executor 39557 486084 62968 0 3 0x4000080 fifor syz-executor 34301 181383 38897 0 3 0x80 fsleep syz-executor 34301 306413 38897 0 2 0x4000000 syz-executor 1880 465634 90896 0 3 0x82 nanoslp syz-executor 42056 93512 0 0 3 0x14200 acct acct 54031 177063 90896 0 3 0x82 nanoslp syz-executor 63322 441245 90896 0 3 0x82 nanoslp syz-executor 25272 491437 90896 0 3 0x82 nanoslp syz-executor 38897 112615 90896 0 3 0x82 wait syz-executor 62968 295590 90896 0 3 0x82 nanoslp syz-executor 97368 244565 90896 0 3 0x82 nanoslp syz-executor 88125 519435 90896 0 3 0x82 nanoslp syz-executor 90896 393510 71440 0 3 0x82 kqread syz-executor 71440 199018 94218 0 3 0x10008a sigsusp ksh 94218 156656 24398 0 3 0x98 kqread sshd-session 24398 479981 66745 0 3 0x92 kqread sshd-session 18958 114848 1 0 3 0x100083 ttyin getty 66745 311629 1 0 3 0x88 kqread sshd 76297 142288 87554 73 3 0x1100090 kqread syslogd 87554 500747 1 0 3 0x100082 sbwait syslogd 26324 403478 1 0 3 0x100080 kqread resolvd 2981 319819 80247 77 3 0x100092 kqread dhcpleased 69656 349400 80247 77 3 0x100092 kqread dhcpleased 80247 310834 1 0 3 0x80 kqread dhcpleased 37438 317323 0 0 3 0x14200 bored smr 20658 138717 0 0 3 0x14200 pgzero zerothread 55849 485129 0 0 3 0x14200 aiodoned aiodoned 15812 511774 0 0 3 0x14200 syncer update 77913 329632 0 0 3 0x14200 cleaner cleaner 77680 84608 0 0 3 0x14200 reaper reaper 14547 282243 0 0 3 0x14200 pgdaemon pagedaemon 87503 224467 0 0 3 0x14200 bored viomb 64642 267118 0 0 3 0x40014200 acpi0 acpi0 98021 90178 0 0 3 0x14200 bored softnet0 52838 234909 0 0 3 0x14200 bored systqmp 27545 435718 0 0 3 0x14200 bored systq 3513 268054 0 0 3 0x40014200 tmoslp softclock 66725 429205 0 0 3 0x40014200 idle0 1 187627 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 11037 12172K 12369K 166960K 12641 0 pcb 18 12K 12K 166960K 79 0 rtable 232 8K 9K 166960K 455 0 pf 33 13K 21K 166960K 73 0 ifaddr 41 7K 7K 166960K 59 0 ifgroup 47 1K 2K 166960K 70 0 sysctl 3 1K 9K 166960K 10 0 counters 33 17K 18K 166960K 43 0 ioctlops 1 2K 4K 166960K 148 0 iov 1 4K 13K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1414 89K 89K 166960K 1966 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 20 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 515 0 sigio 0 0K 0K 166960K 5 0 proc 60 59K 124K 166960K 571 0 subproc 72 4K 4K 166960K 83 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 55 0 in_multi 96 7K 7K 166960K 124 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 401 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 222 164K 168K 166960K 6141 0 UVM aobj 13 2K 2K 166960K 13 0 pinsyscall 39 78K 96K 166960K 1641 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 21 0 NDP 11 0K 2K 166960K 38 0 temp 49 9105K 9175K 166960K 15200 0 kqueue 16 22K 34K 166960K 89 0 SYN cache 2 16K 24K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 158 0 154 3 0 3 3 0 8 2 rtentry 136 136 0 37 4 0 4 4 0 8 0 unpcb 144 241 0 213 2 0 2 2 0 8 0 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpcb 736 91 0 86 2 0 2 2 0 8 1 arp 96 22 0 4 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 5 0 4 1 0 1 1 0 8 0 inpcb 328 415 0 406 10 3 7 7 0 8 5 ip6q 72 2 0 1 1 0 1 1 0 8 0 ip6af 40 3 0 2 1 0 1 1 0 8 0 nd6 112 29 0 7 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 ppxss 1072 8 0 8 1 0 1 1 0 8 1 pfstscr 40 4 0 4 1 0 1 1 0 8 1 pfrktable 1344 3 0 3 1 0 1 1 0 8 1 pfanchor 1288 4 0 1 1 0 1 1 0 8 0 pfstkey 128 4 0 4 1 0 1 1 0 8 1 pfstate 384 2 0 2 1 0 1 1 0 8 1 pfrule 1360 3 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 598 0 131 31 0 31 31 0 8 1 art_table 40 599 0 131 5 0 5 5 0 8 0 art_node 32 136 0 46 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 64 17 0 7 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2335 0 878 92 0 92 92 0 8 0 ffsino 256 2335 0 878 92 0 92 92 0 8 0 nchpl 144 3040 0 1339 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2791 0 0 156 0 156 156 0 8 0 namei 1024 10008 0 10008 2 1 1 2 0 8 1 pfiaddrpl 120 1 0 1 1 0 1 1 0 8 1 kstatmem 264 39 0 16 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 0 1 1 0 8 1 scxspl 216 17355 0 17355 11 3 8 8 1 8 8 plimitpl 152 202 0 184 1 0 1 1 0 8 0 sigapl 424 809 0 765 7 1 6 6 0 8 0 knotepl 120 18805 0 18755 22 11 11 16 0 8 8 kqueuepl 184 153 0 142 3 0 3 3 0 8 2 pipepl 304 148 0 120 3 0 3 3 0 8 0 fdescpl 448 795 0 765 5 1 4 5 0 8 0 filepl 120 4427 0 4200 12 0 12 12 0 8 2 lockfpl 104 195 0 193 1 0 1 1 0 8 0 lockfspl 48 86 0 84 1 0 1 1 0 8 0 sessionpl 144 34 0 26 1 0 1 1 0 8 0 pgrppl 48 49 0 33 1 0 1 1 0 8 0 ucredpl 104 807 0 795 1 0 1 1 0 8 0 zombiepl 144 765 0 765 2 1 1 1 0 8 1 processpl 1152 809 0 765 4 0 4 4 0 8 0 procpl 664 1381 0 1328 6 0 6 6 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 830 0 789 9 2 7 7 0 8 3 mcl64k 65536 84 0 83 1 0 1 1 0 8 0 mcl16k 16384 9 0 9 2 1 1 1 0 8 1 mcl12k 12288 1 0 1 1 1 0 1 0 8 0 mcl9k128 9344 66 0 66 2 1 1 1 0 8 1 mcl8k 8192 7 0 7 2 1 1 1 0 8 1 mcl4k 4096 3033 0 2982 15 7 8 14 0 8 0 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 552 0 544 5 0 5 5 0 8 3 mtagpl 96 5 0 4 2 1 1 1 0 8 0 mbufpl 256 8288 0 8075 20 0 20 20 0 8 6 bufpl 280 7810 0 1594 445 0 445 445 0 8 0 anonpl 24 145087 0 138779 71 14 57 57 0 186 16 amapchunkpl 152 19756 0 19277 38 7 31 31 0 158 11 amappl16 200 2738 0 2519 29 7 22 22 0 8 10 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 436 0 435 1 0 1 1 0 8 0 amappl13 176 124 0 113 1 0 1 1 0 8 0 amappl12 168 1033 0 1004 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 59 0 49 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 104 0 103 1 0 1 1 0 8 0 amappl7 128 147 0 134 1 0 1 1 0 8 0 amappl6 120 159 0 158 1 0 1 1 0 8 0 amappl5 112 98 0 90 1 0 1 1 0 8 0 amappl4 104 273 0 257 1 0 1 1 0 8 0 amappl3 96 3856 0 3743 4 0 4 4 0 8 0 amappl2 88 527 0 473 2 0 2 2 0 8 0 amappl1 80 11763 0 11206 13 0 13 13 0 8 1 amappl 88 5375 0 5218 5 0 5 5 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 0 8 0 dma8192 8192 2 0 2 1 0 1 1 0 8 1 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 128 254 0 254 2 1 1 1 0 8 1 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 12 0 0 1 0 1 1 0 8 0 uaddrrnd 24 795 0 765 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 795 0 765 1 0 1 1 0 8 0 vmmpekpl 168 7987 0 7953 2 0 2 2 0 8 0 vmmpepl 168 58192 0 56175 96 0 96 96 0 357 8 vmsppl 368 794 0 765 4 1 3 4 0 8 0 rwobjpl 40 18948 0 17785 15 1 14 14 0 8 0 pdppl 4096 1596 0 1530 102 36 66 82 0 8 0 pvpl 32 366182 0 353671 152 22 130 130 0 265 19 pmappl 216 794 0 765 3 1 2 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 386 0 51 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a7660a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7660a8,0) 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,ffffffff83064980,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015e7000,3,ffff80002f8b0018) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd805c679eb8,84946467,ffff8000015e7000,3,fffffd8007ffd820,ffff80002f8b0018) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cdb7bd0,84946467,ffff8000015e7000,ffff80002f8b0018) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f8b0018,ffff80003c91dbc0,ffff80003c91db10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c91dbc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c91dbc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9e77815fe30, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a7660a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7660a8,0) 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,ffffffff83064980,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015e7000,3,ffff80002f8b0018) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd805c679eb8,84946467,ffff8000015e7000,3,fffffd8007ffd820,ffff80002f8b0018) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806cdb7bd0,84946467,ffff8000015e7000,ffff80002f8b0018) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f8b0018,ffff80003c91dbc0,ffff80003c91db10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c91dbc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c91dbc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9e77815fe30, count: -14