uvm_fault(0xffffffff83accc50, 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 *402913 73567 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a79ed10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838c7f80,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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,ffffffff81961fd0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015ef000,3,ffff80002f0b0d10) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806ab663a8,84946467,ffff8000015ef000,3,fffffd8007ffd410,ffff80002f0b0d10) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806a860800,84946467,ffff8000015ef000,ffff80002f0b0d10) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f0b0d10,ffff80003c913890,ffff80003c9137e0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c913890) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c913890) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd017d6a3060, 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(0xffffffff83accc50, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a79ed10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838c7f80,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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,ffffffff81961fd0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015ef000,3,ffff80002f0b0d10) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806ab663a8,84946467,ffff8000015ef000,3,fffffd8007ffd410,ffff80002f0b0d10) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806a860800,84946467,ffff8000015ef000,ffff80002f0b0d10) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f0b0d10,ffff80003c913890,ffff80003c9137e0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c913890) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c913890) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd017d6a3060, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c913200 rbx 0xffff80002a79ed10 rdx 0xffff80002f0b0d10 rcx 0xffff800029ee6000 rax 0xfffffd806cae8db0 r8 0xffff80003c913388 r9 0x21 r10 0x93a543dec67712c5 r11 0x55cc01a2f9057863 r12 0xffffffff825f2770 endtsleep r13 0xffff80002a7367d0 r14 0xffff80002a79ed10 r15 0 rip 0xffffffff822729c2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c9131e0 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=402913 pid=73567 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=81, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f0b07e0,0xffff80002a736018 process=0xffff80002a744d88 user=0xffff80003c90e000, vmspace=0xfffffd807ea03188 estcpu=31, cpticks=3, pctcpu=0.0, user=0, sys=2, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 74237 117736 5924 0 3 0x80 nanoslp syz-executor 74237 278269 5924 0 3 0x4000080 sbwait syz-executor 74237 369004 5924 0 3 0x4000080 fsleep syz-executor 73567 224644 77017 0 2 0 syz-executor *73567 402913 77017 0 7 0x4000000 syz-executor 24819 140250 41105 0 2 0 syz-executor 24819 184169 41105 0 3 0x4000080 fsleep syz-executor 5924 27469 89784 0 3 0x82 nanoslp syz-executor 90047 18672 89784 0 3 0x82 piperd syz-executor 8323 193927 89784 0 2 0x2 syz-executor 75989 82564 89784 0 2 0x2 syz-executor 21686 195129 89784 0 2 0x2 syz-executor 77017 225506 89784 0 2 0xc82 syz-executor 41105 282990 89784 0 2 0xc82 syz-executor 89784 9002 40181 0 3 0x82 nanoslp syz-executor 40181 157068 30953 0 3 0x10008a sigsusp ksh 30953 260336 99068 0 3 0x98 kqread sshd-session 99068 321063 53717 0 3 0x92 kqread sshd-session 99485 313592 1 0 3 0x100083 ttyin getty 53717 104193 1 0 3 0x88 kqread sshd 73509 126267 42384 73 3 0x1100090 kqread syslogd 42384 359936 1 0 3 0x100082 sbwait syslogd 84092 455802 1 0 3 0x100080 kqread resolvd 21391 153541 37456 77 3 0x100092 kqread dhcpleased 64592 411253 37456 77 3 0x100092 kqread dhcpleased 37456 56542 1 0 3 0x80 kqread dhcpleased 12277 244950 0 0 3 0x14200 bored smr 11515 353212 0 0 2 0x14200 zerothread 37741 257795 0 0 3 0x14200 aiodoned aiodoned 62974 504551 0 0 3 0x14200 syncer update 31194 456762 0 0 3 0x14200 cleaner cleaner 15967 337732 0 0 3 0x14200 reaper reaper 35951 250912 0 0 3 0x14200 pgdaemon pagedaemon 35846 205936 0 0 3 0x14200 bored viomb 76945 449427 0 0 3 0x40014200 acpi0 acpi0 64960 198000 0 0 3 0x14200 bored softnet0 38792 129326 0 0 3 0x14200 bored systqmp 71302 337562 0 0 3 0x14200 bored systq 18527 489790 0 0 3 0x40014200 tmoslp softclock 59723 253550 0 0 3 0x40014200 idle0 1 277217 0 0 3 0x82 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 12106K 12490K 166960K 12506 0 pcb 17 14K 15K 166960K 94 0 rtable 192 7K 8K 166960K 431 0 pf 30 13K 20K 166960K 100 0 ifaddr 36 6K 7K 166960K 57 0 ifgroup 46 2K 2K 166960K 74 0 sysctl 3 1K 9K 166960K 11 0 counters 32 17K 18K 166960K 45 0 ioctlops 1 2K 4K 166960K 95 0 iov 0 0K 8K 166960K 10 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1305 82K 82K 166960K 1734 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 76 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 12 41K 89K 166960K 491 0 sigio 0 0K 0K 166960K 3 0 proc 60 59K 83K 166960K 547 0 subproc 63 3K 5K 166960K 234 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 31 0 in_multi 78 5K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 19 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 427 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 178 141K 168K 166960K 5809 0 UVM aobj 14 2K 2K 166960K 16 0 pinsyscall 33 66K 95K 166960K 1611 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 10 0K 1K 166960K 35 0 temp 41 9108K 9172K 166960K 17953 0 kqueue 13 20K 28K 166960K 82 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 69 0 66 1 0 1 1 0 8 0 rtentry 136 125 0 42 4 0 4 4 0 8 0 unpcb 144 164 0 145 2 1 1 2 0 8 0 syncache 336 8 0 8 2 1 1 1 0 8 1 tcpcb 736 79 0 75 1 0 1 1 0 8 0 arp 96 20 0 5 1 0 1 1 0 8 0 ipq 40 4 0 0 1 0 1 1 0 8 0 ipqe 40 69 0 1 1 0 1 1 0 8 0 inpcb 328 344 0 335 7 1 6 6 0 8 5 ip6q 72 2 0 0 1 0 1 1 0 8 0 ip6af 40 2 0 0 1 0 1 1 0 8 0 nd6 112 29 0 9 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 26 0 19 1 0 1 1 0 8 0 ppxss 1072 9 0 9 2 1 1 1 0 8 1 pppxif 1416 1 0 1 1 1 0 1 0 8 0 pfstscr 40 4 0 2 1 0 1 1 0 8 0 pfrktable 1344 10 0 8 2 1 1 1 0 8 0 pfanchor 1288 8 0 5 1 0 1 1 0 8 0 pftag 88 2 0 2 1 0 1 1 0 8 1 pfqueue 320 2 0 2 1 0 1 1 0 8 1 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 128 6 0 2 1 0 1 1 0 8 0 pfstate 384 3 0 1 1 0 1 1 0 8 0 pfrule 1360 7 0 6 2 1 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 524 0 149 30 1 29 30 0 8 4 art_table 40 525 0 149 5 0 5 5 0 8 0 art_node 32 125 0 50 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 64 74 0 68 1 0 1 1 0 8 0 shmpl 112 13 0 2 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2160 0 687 93 0 93 93 0 8 0 ffsino 256 2160 0 687 93 0 93 93 0 8 0 nchpl 144 2781 0 1072 64 0 64 64 0 8 0 rtmask 32 2 0 2 2 1 1 1 0 8 1 vnodes 216 2510 0 0 140 0 140 140 0 8 0 namei 1024 8952 0 8951 2 1 1 1 0 8 0 pfiaddrpl 120 3 0 2 2 1 1 1 0 8 0 kstatmem 264 39 0 18 2 0 2 2 0 8 0 scsiplug 72 2 0 2 2 1 1 1 0 8 1 scxspl 216 15581 0 15581 11 3 8 8 1 8 8 plimitpl 152 120 0 104 1 0 1 1 0 8 0 sigapl 424 756 0 719 6 1 5 6 0 8 0 knotepl 120 13030 0 12983 17 7 10 10 0 8 8 kqueuepl 184 100 0 91 1 0 1 1 0 8 0 pipepl 304 185 0 158 3 0 3 3 0 8 0 fdescpl 448 742 0 718 5 1 4 5 0 8 0 filepl 120 3719 0 3521 11 3 8 11 0 8 0 lockfpl 104 98 0 96 1 0 1 1 0 8 0 lockfspl 48 47 0 45 1 0 1 1 0 8 0 sessionpl 144 50 0 42 1 0 1 1 0 8 0 pgrppl 48 78 0 63 1 0 1 1 0 8 0 ucredpl 104 486 0 475 1 0 1 1 0 8 0 zombiepl 144 719 0 719 1 0 1 1 0 8 1 processpl 1152 756 0 719 4 0 4 4 0 8 1 procpl 664 1193 0 1152 7 1 6 6 0 8 2 sosppl 176 2 0 2 1 1 0 1 0 8 0 sockpl 552 595 0 564 8 1 7 7 0 8 4 mcl64k 65536 25 0 25 2 1 1 1 0 8 1 mcl16k 16384 4 0 4 1 1 0 1 0 8 0 mcl9k128 9344 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 10 0 10 2 1 1 1 0 8 1 mcl4k 4096 2918 0 2851 15 5 10 13 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 506 0 501 3 0 3 3 0 8 2 mtagpl 96 11 0 5 1 0 1 1 0 8 0 mbufpl 256 7590 0 7324 18 0 18 18 0 8 0 bufpl 280 6136 0 104 431 0 431 431 0 8 0 anonpl 24 118914 0 115857 72 0 72 72 0 186 29 amapchunkpl 152 18128 0 17790 43 15 28 36 0 158 12 amappl16 200 2164 0 2124 27 14 13 27 0 8 8 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 414 0 413 1 0 1 1 0 8 0 amappl13 176 121 0 111 1 0 1 1 0 8 0 amappl12 168 998 0 975 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 60 0 50 1 0 1 1 0 8 0 amappl9 144 272 0 271 1 0 1 1 0 8 0 amappl8 136 96 0 95 1 0 1 1 0 8 0 amappl7 128 144 0 132 1 0 1 1 0 8 0 amappl6 120 148 0 147 1 0 1 1 0 8 0 amappl5 112 92 0 85 1 0 1 1 0 8 0 amappl4 104 264 0 248 1 0 1 1 0 8 0 amappl3 96 3478 0 3398 4 0 4 4 0 8 1 amappl2 88 539 0 484 2 0 2 2 0 8 0 amappl1 80 12229 0 11698 15 1 14 15 0 8 1 amappl 88 5039 0 4923 5 0 5 5 0 92 1 uvmvnodes 80 106 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 7 0 7 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 15 0 2 1 0 1 1 0 8 0 uaddrrnd 24 742 0 718 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 742 0 718 1 0 1 1 0 8 0 vmmpekpl 168 8115 0 8075 2 0 2 2 0 8 0 vmmpepl 168 56495 0 54949 102 2 100 100 0 357 19 vmsppl 368 741 0 718 4 1 3 4 0 8 0 rwobjpl 40 18366 0 17450 15 0 15 15 0 8 0 pdppl 4096 1490 0 1436 110 48 62 78 0 8 8 pvpl 32 330242 0 322223 163 0 163 163 0 265 67 pmappl 216 741 0 718 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 390 0 64 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a79ed10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838c7f80,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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,ffffffff81961fd0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015ef000,3,ffff80002f0b0d10) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806ab663a8,84946467,ffff8000015ef000,3,fffffd8007ffd410,ffff80002f0b0d10) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806a860800,84946467,ffff8000015ef000,ffff80002f0b0d10) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f0b0d10,ffff80003c913890,ffff80003c9137e0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c913890) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c913890) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd017d6a3060, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a79ed10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838c7f80,ffff80002a736868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a736868,0) 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,ffffffff81961fd0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015ef000,3,ffff80002f0b0d10) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806ab663a8,84946467,ffff8000015ef000,3,fffffd8007ffd410,ffff80002f0b0d10) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806a860800,84946467,ffff8000015ef000,ffff80002f0b0d10) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002f0b0d10,ffff80003c913890,ffff80003c9137e0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c913890) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c913890) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd017d6a3060, count: -14