uvm_fault(0xffffffff839ab540, 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 *332103 1132 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83847c50,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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,ffffffff8267c470,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000015cd800,3,ffff8000338ce028) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8066949b30,84946467,ffff8000015cd800,3,fffffd8007ffd618,ffff8000338ce028) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806688b2d0,84946467,ffff8000015cd800,ffff8000338ce028) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000338ce028,ffff80003c93fd70,ffff80003c93fcc0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c93fd70) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c93fd70) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd51a18d37a0, 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(0xffffffff839ab540, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff83847c50,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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,ffffffff8267c470,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000015cd800,3,ffff8000338ce028) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8066949b30,84946467,ffff8000015cd800,3,fffffd8007ffd618,ffff8000338ce028) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806688b2d0,84946467,ffff8000015cd800,ffff8000338ce028) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000338ce028,ffff80003c93fd70,ffff80003c93fcc0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c93fd70) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c93fd70) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd51a18d37a0, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c93f6e0 rbx 0xffff80002a7afa90 rdx 0xffff8000338ce028 rcx 0xffff800029ef6000 rax 0xfffffd806cd09c30 r8 0 r9 0x201 r10 0xd58e67a379704011 r11 0x24961a72fde96eba r12 0xffffffff81b19160 endtsleep r13 0xffff80002a747230 r14 0xffff80002a7afa90 r15 0 rip 0xffffffff831ad5d2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c93f6c0 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=332103 pid=1132 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=0xffff8000338cfa18,0xffffffff839c2070 process=0xffff8000ffff8498 user=0xffff80003c93a000, vmspace=0xfffffd806ccfe2f0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 1132 222347 66612 0 2 0 syz-executor * 1132 332103 66612 0 7 0x4000000 syz-executor 5246 112236 37834 0 2 0 syz-executor 5246 139936 37834 0 3 0x4000080 fsleep syz-executor 5246 120476 37834 0 3 0x4000080 fsleep syz-executor 5246 278715 37834 0 3 0x4000080 fsleep syz-executor 74764 459856 23864 0 2 0 syz-executor 74764 370981 23864 0 3 0x4000080 fsleep syz-executor 92586 257875 49362 0 3 0x80 fsleep syz-executor 92586 235433 49362 0 3 0x4000080 ttyout syz-executor 91929 490751 36944 0 3 0x80 fsleep syz-executor 91929 426435 36944 0 3 0x4000080 sbwait syz-executor 48810 144338 32576 0 3 0x80 fsleep syz-executor 48810 70353 32576 0 3 0x4000080 netcon syz-executor 23864 163597 89369 0 3 0x82 nanoslp syz-executor 30297 57781 0 0 3 0x14200 acct acct 36944 288600 89369 0 3 0x82 nanoslp syz-executor 32576 369414 89369 0 3 0x82 nanoslp syz-executor 49362 398915 89369 0 3 0x82 nanoslp syz-executor 66612 50392 89369 0 3 0x82 nanoslp syz-executor 18142 284930 89369 0 3 0x82 nanoslp syz-executor 61174 229119 89369 0 2 0x2 syz-executor 37834 124162 89369 0 3 0x82 nanoslp syz-executor 89369 154854 75093 0 2 0x2 syz-executor 75093 318898 94668 0 3 0x10008a sigsusp ksh 94668 123494 84379 0 3 0x98 kqread sshd-session 84379 260416 80134 0 3 0x92 kqread sshd-session 19459 321948 1 0 3 0x100083 ttyin getty 80134 119146 1 0 3 0x88 kqread sshd 20990 249921 50429 73 3 0x1100090 kqread syslogd 50429 333575 1 0 3 0x100082 sbwait syslogd 6343 256174 1 0 3 0x100080 kqread resolvd 79169 196908 95695 77 3 0x100092 kqread dhcpleased 37339 41679 95695 77 3 0x100092 kqread dhcpleased 95695 33667 1 0 3 0x80 kqread dhcpleased 311 123594 0 0 3 0x14200 bored smr 93304 352799 0 0 2 0x14200 zerothread 25483 425066 0 0 3 0x14200 aiodoned aiodoned 71262 149267 0 0 3 0x14200 syncer update 30021 118240 0 0 3 0x14200 cleaner cleaner 11428 112636 0 0 3 0x14200 reaper reaper 80148 124235 0 0 3 0x14200 pgdaemon pagedaemon 97395 126260 0 0 3 0x14200 bored viomb 18703 337551 0 0 3 0x40014200 acpi0 acpi0 76331 155012 0 0 3 0x14200 bored softnet0 2371 372556 0 0 3 0x14200 bored systqmp 42245 214055 0 0 3 0x14200 bored systq 64158 164183 0 0 3 0x40014200 tmoslp softclock 51698 436060 0 0 3 0x40014200 idle0 1 209954 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 11053 12258K 13283K 166960K 13323 0 pcb 18 15K 16K 166960K 189 0 rtable 244 9K 11K 166960K 569 0 pf 30 13K 18K 166960K 125 0 ifaddr 39 7K 8K 166960K 73 0 ifgroup 46 2K 2K 166960K 98 0 sysctl 4 1K 9K 166960K 10 0 counters 32 17K 18K 166960K 156 0 ioctlops 1 2K 6K 166960K 244 0 iov 0 0K 16K 166960K 31 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1454 91K 92K 166960K 2324 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 85K 166960K 854 0 sigio 0 0K 0K 166960K 18 0 proc 61 67K 83K 166960K 628 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 87 0 in_multi 88 6K 7K 166960K 157 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 24 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 603 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 213 142K 159K 166960K 9227 0 UVM aobj 23 4K 4K 166960K 24 0 pinsyscall 38 76K 91K 166960K 2023 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 33 0 NDP 10 0K 2K 166960K 50 0 temp 68 9074K 9151K 166960K 24531 0 kqueue 15 24K 30K 166960K 171 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 120 239 0 236 3 0 3 3 0 8 2 rtentry 136 170 0 65 5 0 5 5 0 8 0 unpcb 144 879 0 861 8 0 8 8 0 8 7 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 342 0 336 7 0 7 7 0 8 6 arp 96 30 0 13 1 0 1 1 0 8 0 ipq 40 6 0 3 1 0 1 1 0 8 0 ipqe 40 11 0 8 1 0 1 1 0 8 0 inpcb 328 1010 0 1000 7 0 7 7 0 8 5 ip6q 72 17 0 16 1 0 1 1 0 8 0 ip6af 40 33 0 32 1 0 1 1 0 8 0 nd6 112 39 0 16 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1072 117 0 117 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pfrktable 1344 14 0 14 1 0 1 1 0 8 1 pfanchor 1288 4 0 4 1 0 1 1 0 8 1 pftag 88 5 0 2 1 0 1 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 128 3 0 2 1 0 1 1 0 8 0 pfstate 384 2 0 1 1 0 1 1 0 8 0 pfrule 1360 18 0 18 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 256 623 0 206 30 0 30 30 0 8 1 art_table 40 625 0 206 5 0 5 5 0 8 0 art_node 32 170 0 79 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 25 0 15 1 0 1 1 0 8 0 shmpl 112 21 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2993 0 1533 92 0 92 92 0 8 0 ffsino 256 2993 0 1533 92 0 92 92 0 8 0 nchpl 144 4166 0 2465 64 0 64 64 0 8 0 rtmask 32 8 0 8 1 0 1 1 0 8 1 vnodes 216 3653 0 0 203 0 203 203 0 8 0 namei 1024 14854 0 14853 1 0 1 1 0 8 0 pfiaddrpl 120 4 0 4 1 0 1 1 0 8 1 kstatmem 264 56 0 36 2 0 2 2 0 8 0 scsiplug 72 5 0 5 1 0 1 1 0 8 1 scxspl 216 20903 0 20903 8 0 8 8 1 8 8 plimitpl 152 221 0 203 1 0 1 1 0 8 0 sigapl 424 1143 0 1100 6 0 6 6 0 8 1 knotepl 120 30359 0 29857 30 14 16 18 0 8 0 kqueuepl 184 421 0 409 4 0 4 4 0 8 3 pipepl 304 166 0 139 3 0 3 3 0 8 0 fdescpl 448 1128 0 1099 4 0 4 4 0 8 0 filepl 120 8113 0 7885 15 0 15 15 0 8 6 lockfpl 104 250 0 248 1 0 1 1 0 8 0 lockfspl 48 124 0 122 1 0 1 1 0 8 0 sessionpl 144 41 0 33 1 0 1 1 0 8 0 pgrppl 48 59 0 43 1 0 1 1 0 8 0 ucredpl 104 1172 0 1161 1 0 1 1 0 8 0 zombiepl 144 1101 0 1100 1 0 1 1 0 8 0 processpl 1152 1143 0 1100 4 0 4 4 0 8 0 procpl 664 2205 0 2154 6 0 6 6 0 8 1 sosppl 176 6 0 6 1 0 1 1 0 8 1 sockpl 552 2157 0 2126 19 9 10 16 0 8 7 mcl64k 65536 35 0 35 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 16 0 16 1 0 1 1 0 8 1 mcl4k 4096 3473 0 3420 14 0 14 14 0 8 6 mcl2k 2048 957 0 955 3 0 3 3 0 8 2 mtagpl 96 15 0 9 1 0 1 1 0 8 0 mbufpl 256 11744 0 11575 17 0 17 17 0 8 0 bufpl 280 7876 0 1662 444 0 444 444 0 8 0 anonpl 24 186452 0 183252 54 0 54 54 0 187 23 amapchunkpl 152 33165 0 32731 34 0 34 34 0 158 13 amappl16 200 3553 0 3522 19 5 14 19 0 8 8 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 452 0 451 1 0 1 1 0 8 0 amappl13 176 120 0 110 1 0 1 1 0 8 0 amappl12 168 1403 0 1375 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 0 1 1 0 8 1 amappl10 152 64 0 53 1 0 1 1 0 8 0 amappl9 144 265 0 265 1 0 1 1 0 8 1 amappl8 136 115 0 114 1 0 1 1 0 8 0 amappl7 128 143 0 131 1 0 1 1 0 8 0 amappl6 120 181 0 179 1 0 1 1 0 8 0 amappl5 112 83 0 75 1 0 1 1 0 8 0 amappl4 104 274 0 256 1 0 1 1 0 8 0 amappl3 96 5953 0 5851 4 0 4 4 0 8 0 amappl2 88 532 0 475 2 0 2 2 0 8 0 amappl1 80 12119 0 11567 13 0 13 13 0 8 1 amappl 88 8388 0 8237 5 0 5 5 0 92 0 uvmvnodes 80 123 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 128 255 0 255 1 0 1 1 0 8 1 dma64 64 7 0 7 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 23 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1128 0 1099 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1128 0 1099 1 0 1 1 0 8 0 vmmpekpl 168 9795 0 9756 2 0 2 2 0 8 0 vmmpepl 168 76446 0 74661 94 0 94 94 0 357 13 vmsppl 368 1127 0 1099 4 0 4 4 0 8 1 rwobjpl 40 22205 0 21224 14 0 14 14 0 8 1 pdppl 4096 2262 0 2198 96 28 68 76 0 8 4 pvpl 32 502116 0 491984 126 0 126 126 0 265 38 pmappl 216 1127 0 1099 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 373 0 28 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(ffffffff83847c50,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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,ffffffff8267c470,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000015cd800,3,ffff8000338ce028) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8066949b30,84946467,ffff8000015cd800,3,fffffd8007ffd618,ffff8000338ce028) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806688b2d0,84946467,ffff8000015cd800,ffff8000338ce028) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000338ce028,ffff80003c93fd70,ffff80003c93fcc0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c93fd70) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c93fd70) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd51a18d37a0, 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(ffffffff83847c50,ffff80002a7472c8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7472c8,0) 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,ffffffff8267c470,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000015cd800,3,ffff8000338ce028) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8066949b30,84946467,ffff8000015cd800,3,fffffd8007ffd618,ffff8000338ce028) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806688b2d0,84946467,ffff8000015cd800,ffff8000338ce028) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000338ce028,ffff80003c93fd70,ffff80003c93fcc0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c93fd70) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c93fd70) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd51a18d37a0, count: -14