uvm_fault(0xffffffff83a78870, 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 *177979 13548 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838ccfa0,ffff80002a7465d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7465d0,0) 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,ffffffff81a35820,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000016c5000,3,ffff80003c8e7ca8) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8060f18968,84946467,ffff8000016c5000,3,fffffd8007ffd548,ffff80003c8e7ca8) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806d877168,84946467,ffff8000016c5000,ffff80003c8e7ca8) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80003c8e7ca8,ffff80003a4e4fc0,ffff80003a4e4f10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003a4e4fc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003a4e4fc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x41bdeb91fc0, 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(0xffffffff83a78870, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838ccfa0,ffff80002a7465d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7465d0,0) 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,ffffffff81a35820,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000016c5000,3,ffff80003c8e7ca8) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8060f18968,84946467,ffff8000016c5000,3,fffffd8007ffd548,ffff80003c8e7ca8) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806d877168,84946467,ffff8000016c5000,ffff80003c8e7ca8) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80003c8e7ca8,ffff80003a4e4fc0,ffff80003a4e4f10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003a4e4fc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003a4e4fc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x41bdeb91fc0, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003a4e4930 rbx 0xffff80002a7afa90 rdx 0xffff80003c8e7ca8 rcx 0xffff800029ef6000 rax 0xfffffd806ccf1db0 r8 0 r9 0x201 r10 0x86ca730de5ba51ed r11 0x6847aeaff8ee7896 r12 0xffffffff82c837e0 endtsleep r13 0xffff80002a746538 r14 0xffff80002a7afa90 r15 0 rip 0xffffffff816c9112 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003a4e4910 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=177979 pid=13548 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=0xffff80002a76ba08,0xffff80003c8e6a90 process=0xffff8000ffff9f98 user=0xffff80003a4e0000, vmspace=0xfffffd806cce82f0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 38627 157676 28489 0 2 0 syz-executor 38627 327286 28489 0 2 0x4000000 syz-executor 23729 393141 36388 0 2 0 syz-executor 23729 272004 36388 0 3 0x4000080 fsleep syz-executor 45382 10704 79497 0 2 0 syz-executor 45382 116845 79497 0 3 0x4000080 fsleep syz-executor 13548 243066 54992 0 2 0 syz-executor *13548 177979 54992 0 7 0x4000000 syz-executor 59815 249774 33002 -1 2 0x10 syz-executor 59815 68909 33002 -1 3 0x4000090 fsleep syz-executor 36771 217114 72426 0 2 0 syz-executor 36771 522282 72426 0 3 0x4000080 fsleep syz-executor 40737 33809 45182 0 2 0 syz-executor 40737 19830 45182 0 3 0x4000080 fifow syz-executor 40737 416010 45182 0 2 0x4000000 syz-executor 54992 265850 26807 0 3 0x82 nanoslp syz-executor 72426 256459 26807 0 3 0x82 nanoslp syz-executor 45182 80165 26807 0 3 0x82 nanoslp syz-executor 79497 37068 26807 0 3 0x82 nanoslp syz-executor 36388 435874 26807 0 3 0x82 nanoslp syz-executor 53091 203386 26807 0 2 0x2 syz-executor 33002 105265 26807 0 3 0x82 nanoslp syz-executor 28489 31586 26807 0 3 0x82 nanoslp syz-executor 26807 328399 32687 0 3 0x82 kqread syz-executor 32687 445122 71416 0 3 0x10008a sigsusp ksh 71416 34288 68907 0 3 0x98 kqread sshd-session 68907 272463 93603 0 3 0x92 kqread sshd-session 55419 172436 1 0 3 0x100083 ttyin getty 93603 37725 1 0 3 0x88 kqread sshd 68920 35579 39478 73 3 0x1100090 kqread syslogd 39478 497841 1 0 3 0x100082 sbwait syslogd 76996 505650 1 0 3 0x100080 kqread resolvd 25116 450582 9037 77 3 0x100092 kqread dhcpleased 98038 344410 9037 77 3 0x100092 kqread dhcpleased 9037 259821 1 0 3 0x80 kqread dhcpleased 99530 169557 0 0 3 0x14200 bored smr 34605 211801 0 0 2 0x14200 zerothread 14966 372401 0 0 3 0x14200 aiodoned aiodoned 84860 180283 0 0 3 0x14200 syncer update 60443 251346 0 0 3 0x14200 cleaner cleaner 13516 38557 0 0 3 0x14200 reaper reaper 31369 392919 0 0 3 0x14200 pgdaemon pagedaemon 8296 62730 0 0 3 0x14200 bored viomb 78840 97775 0 0 3 0x40014200 acpi0 acpi0 73143 238711 0 0 3 0x14200 bored softnet0 72527 419215 0 0 3 0x14200 bored systqmp 87782 394699 0 0 3 0x14200 bored systq 87321 435142 0 0 3 0x40014200 tmoslp softclock 30641 12663 0 0 3 0x40014200 idle0 1 107409 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 11047 12113K 12515K 166960K 14258 0 pcb 17 14K 15K 166960K 196 0 rtable 216 15K 16K 166960K 612 0 pf 33 13K 21K 166960K 576 0 ifaddr 42 8K 9K 166960K 193 0 ifgroup 54 2K 2K 166960K 343 0 sysctl 2 1K 9K 166960K 7 0 counters 34 17K 18K 166960K 211 0 ioctlops 1 2K 4K 166960K 333 0 iov 0 0K 12K 166960K 75 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1297 82K 82K 166960K 2592 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 23 0 VM map 2 1K 1K 166960K 2 0 sem 19 376K 688K 166960K 32 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 1776 0 sigio 0 0K 0K 166960K 8 0 proc 60 59K 91K 166960K 584 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 59 0 in_multi 91 6K 7K 166960K 155 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 49 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 442 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 211 150K 167K 166960K 15917 0 UVM aobj 31 2K 2K 166960K 32 0 pinsyscall 38 76K 94K 166960K 2916 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 12 0K 2K 166960K 143 0 temp 41 9071K 9139K 166960K 56571 0 kqueue 13 20K 28K 166960K 186 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 120 100 0 97 1 0 1 1 0 8 0 rtentry 136 177 0 86 4 0 4 4 0 8 0 unpcb 144 311 0 292 1 0 1 1 0 8 0 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpqe 32 2 0 2 2 1 1 1 0 8 1 tcpcb 736 135 0 129 1 0 1 1 0 8 0 arp 96 22 0 6 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 579 0 570 8 1 7 7 0 8 6 nd6 112 40 0 18 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1072 151 0 151 2 1 1 1 0 8 1 pppxif 1416 23 0 23 2 1 1 1 0 8 1 pfsrclim 320 1 0 1 1 1 0 1 0 8 0 pfanchor 1288 5 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfrule 1360 4 0 4 2 1 1 1 0 8 1 rttmr 136 10 0 10 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1004 0 597 33 3 30 32 0 8 3 art_table 40 1005 0 597 6 1 5 6 0 8 0 art_node 32 177 0 96 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 26 0 9 1 0 1 1 0 8 0 shmpl 112 29 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 4177 0 2714 92 0 92 92 0 8 0 ffsino 256 4177 0 2714 92 0 92 92 0 8 0 nchpl 144 6335 0 4636 64 0 64 64 0 8 0 rtmask 32 25 0 25 2 1 1 1 0 8 1 vnodes 216 5003 0 0 278 0 278 278 0 8 0 namei 1024 16610 0 16609 3 2 1 2 0 8 0 kstatmem 264 246 0 222 3 1 2 3 0 8 0 scsiplug 72 12 0 12 2 1 1 1 0 8 1 scxspl 216 25137 0 25137 8 7 1 8 1 8 1 plimitpl 152 137 0 120 1 0 1 1 0 8 0 sigapl 424 2063 0 2021 7 1 6 6 0 8 0 knotepl 120 67351 0 67304 23 13 10 16 0 8 7 kqueuepl 184 286 0 277 1 0 1 1 0 8 0 pipepl 304 160 0 133 3 0 3 3 0 8 0 fdescpl 448 2050 0 2021 5 1 4 5 0 8 0 filepl 120 6556 0 6343 12 1 11 11 0 8 4 lockfpl 104 569 0 566 1 0 1 1 0 8 0 lockfspl 48 279 0 276 1 0 1 1 0 8 0 sessionpl 144 28 0 20 1 0 1 1 0 8 0 pgrppl 48 39 0 23 1 0 1 1 0 8 0 ucredpl 104 877 0 865 1 0 1 1 0 8 0 zombiepl 144 2150 0 2150 2 1 1 1 0 8 1 processpl 1152 2063 0 2021 4 0 4 4 0 8 0 procpl 664 3881 0 3830 6 0 6 6 0 8 1 sosppl 176 6 0 6 2 1 1 1 0 8 1 sockpl 552 1000 0 969 8 0 8 8 0 8 5 mcl64k 65536 160 0 160 2 1 1 1 0 8 1 mcl16k 16384 88 0 88 2 1 1 1 0 8 1 mcl12k 12288 28 0 28 2 1 1 1 0 8 1 mcl9k 9216 14 0 14 2 1 1 1 0 8 1 mcl8k 8192 162 0 162 2 1 1 1 0 8 1 mcl4k 4096 5709 0 5660 13 6 7 13 0 8 0 mcl2k2 2112 34 0 34 2 1 1 1 0 8 1 mcl2k 2048 1277 0 1276 1 0 1 1 0 8 0 mtagpl 96 81 0 30 2 0 2 2 0 8 0 mbufpl 256 21046 0 20811 25 0 25 25 0 8 8 bufpl 280 8161 0 1947 445 0 445 445 0 8 0 anonpl 24 252860 0 249630 72 19 53 54 0 187 15 amapchunkpl 152 53177 0 52738 34 1 33 33 0 158 13 amappl16 200 4479 0 4445 26 14 12 15 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 437 0 435 1 0 1 1 0 8 0 amappl13 176 116 0 106 1 0 1 1 0 8 0 amappl12 168 2322 0 2294 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 61 0 51 1 0 1 1 0 8 0 amappl9 144 257 0 256 1 0 1 1 0 8 0 amappl8 136 107 0 106 1 0 1 1 0 8 0 amappl7 128 177 0 166 1 0 1 1 0 8 0 amappl6 120 201 0 200 1 0 1 1 0 8 0 amappl5 112 95 0 88 1 0 1 1 0 8 0 amappl4 104 273 0 258 1 0 1 1 0 8 0 amappl3 96 11712 0 11610 4 0 4 4 0 8 1 amappl2 88 534 0 481 2 0 2 2 0 8 0 amappl1 80 16280 0 15726 17 2 15 15 0 8 2 amappl 88 15097 0 14948 4 0 4 4 0 92 0 uvmvnodes 80 124 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 2 1 1 1 0 8 1 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 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 31 0 1 1 0 1 1 0 8 0 uaddrrnd 24 2050 0 2021 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2050 0 2021 1 0 1 1 0 8 0 vmmpekpl 168 14065 0 14017 3 0 3 3 0 8 0 vmmpepl 168 127476 0 125700 101 9 92 92 0 357 11 vmsppl 368 2049 0 2021 4 1 3 4 0 8 0 rwobjpl 40 31097 0 30110 14 1 13 13 0 8 0 pdppl 4096 4106 0 4042 104 36 68 82 0 8 4 pvpl 32 868769 0 859486 165 31 134 141 0 265 27 pmappl 216 2049 0 2021 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 391 0 56 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(ffffffff838ccfa0,ffff80002a7465d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7465d0,0) 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,ffffffff81a35820,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000016c5000,3,ffff80003c8e7ca8) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8060f18968,84946467,ffff8000016c5000,3,fffffd8007ffd548,ffff80003c8e7ca8) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806d877168,84946467,ffff8000016c5000,ffff80003c8e7ca8) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80003c8e7ca8,ffff80003a4e4fc0,ffff80003a4e4f10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003a4e4fc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003a4e4fc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x41bdeb91fc0, 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(ffffffff838ccfa0,ffff80002a7465d0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7465d0,0) 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,ffffffff81a35820,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d02,84946467,ffff8000016c5000,3,ffff80003c8e7ca8) at sdioctl+0x959 sys/scsi/sd.c:921 VOP_IOCTL(fffffd8060f18968,84946467,ffff8000016c5000,3,fffffd8007ffd548,ffff80003c8e7ca8) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806d877168,84946467,ffff8000016c5000,ffff80003c8e7ca8) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80003c8e7ca8,ffff80003a4e4fc0,ffff80003a4e4f10) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003a4e4fc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003a4e4fc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x41bdeb91fc0, count: -14