uvm_fault(0xffffffff838b92d0, 0xffff800029f26000, 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 *252553 27023 0 0x2 0 0 syz-executor kcov_remote_enter(0,ffff80002a7da890) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a776868) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a776868,0) 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 Xspllower() at Xspllower+0x1d mi_switch() at mi_switch+0x26b sys/kern/sched_bsd.c:409 pool_get(ffffffff8394e288,9) at pool_get+0x21b sys/kern/subr_pool.c:591 ffs_vget(ffff800000b58800,1340a,ffff80002a877270) at ffs_vget+0x104 sys/ufs/ffs/ffs_vfsops.c:1215 ufs_lookup() at ufs_lookup+0x16ad sys/ufs/ufs/ufs_lookup.c:573 VOP_LOOKUP(fffffd8066da27a8,ffff80002a877500,ffff80002a877530) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a8774d0) at vfs_lookup+0x921 sys/kern/vfs_lookup.c:566 end trace frame: 0xffff80002a8774b0, count: 0 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(0xffffffff838b92d0, 0xffff800029f26000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7da890) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a776868) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a776868,0) 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 Xspllower() at Xspllower+0x1d mi_switch() at mi_switch+0x26b sys/kern/sched_bsd.c:409 pool_get(ffffffff8394e288,9) at pool_get+0x21b sys/kern/subr_pool.c:591 ffs_vget(ffff800000b58800,1340a,ffff80002a877270) at ffs_vget+0x104 sys/ufs/ffs/ffs_vfsops.c:1215 ufs_lookup() at ufs_lookup+0x16ad sys/ufs/ufs/ufs_lookup.c:573 VOP_LOOKUP(fffffd8066da27a8,ffff80002a877500,ffff80002a877530) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a8774d0) at vfs_lookup+0x921 sys/kern/vfs_lookup.c:566 namei(ffff80002a8774d0) at namei+0x7ca sys/kern/vfs_lookup.c:250 dofstatat(ffff80002a7b8fa8,ffffff9c,73ea88828610,73ea88828a10,2) at dofstatat+0xe4 sys/kern/vfs_syscalls.c:2086 syscall(ffff80002a877730) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a877730) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73ea88828ac0, count: -18 ddb> show registers rdi 0xffffffff rsi 0xffff800000b11c00 rbp 0xffff80002a876de0 rbx 0xffff80002a7da890 rdx 0xffff80002a7b8fa8 rcx 0xffff800029f26000 rax 0xfffffd806cb33cf0 r8 0x30 r9 0xfffffd8007bfd6e8 r10 0xb40c280cfbff194 r11 0x873aff55366eda35 r12 0xffffffff8249a7a0 endtsleep r13 0xffff80002a7767d0 r14 0xffff80002a7da890 r15 0 rip 0xffffffff82bbab62 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a876dc0 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=252553 pid=27023 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a776008,0xffff80002a7b8d20 process=0xffff8000ffff8918 user=0xffff80002a872000, vmspace=0xfffffd806be7da28 estcpu=36, cpticks=5, pctcpu=0.2, user=1, sys=3, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 82070 440414 5668 0 2 0 syz-executor 82070 106106 5668 0 3 0x4000080 fsleep syz-executor 82070 122745 5668 0 3 0x4000080 fsleep syz-executor 63530 129955 0 0 3 0x14200 acct acct *27023 252553 65102 0 7 0x2 syz-executor 72013 218685 65102 0 3 0x82 nanoslp syz-executor 5668 107573 65102 0 3 0x82 nanoslp syz-executor 21390 363051 65102 0 3 0x82 nanoslp syz-executor 70288 126408 65102 0 3 0x82 nanoslp syz-executor 65102 473080 96688 0 3 0x82 wait syz-executor 96688 501 45841 0 3 0x10008a sigsusp ksh 45841 472870 97658 0 3 0x98 kqread sshd-session 97658 291653 95183 0 3 0x92 kqread sshd-session 65310 154212 1 0 3 0x100083 ttyin getty 95183 82198 1 0 3 0x88 kqread sshd 14632 288813 93613 73 3 0x1100090 kqread syslogd 93613 500647 1 0 3 0x100082 sbwait syslogd 82182 22362 1 0 3 0x100080 kqread resolvd 19693 152843 28079 77 3 0x100092 kqread dhcpleased 73998 203811 28079 77 3 0x100092 kqread dhcpleased 28079 319441 1 0 3 0x80 kqread dhcpleased 31639 432356 0 0 3 0x14200 bored smr 97291 407430 0 0 2 0x14200 zerothread 21162 272125 0 0 3 0x14200 aiodoned aiodoned 71384 173088 0 0 3 0x14200 syncer update 5844 161282 0 0 3 0x14200 cleaner cleaner 95374 98922 0 0 3 0x14200 reaper reaper 43297 287915 0 0 3 0x14200 pgdaemon pagedaemon 77624 305732 0 0 3 0x14200 bored viomb 85793 270792 0 0 3 0x40014200 acpi0 acpi0 99504 283853 0 0 3 0x14200 bored softnet0 46008 443438 0 0 3 0x14200 smrbar systqmp 7513 150281 0 0 3 0x14200 bored systq 90100 441728 0 0 3 0x40014200 tmoslp softclock 81853 511348 0 0 3 0x40014200 idle0 1 419084 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 10202 11059K 12180K 166960K 13674 0 pcb 18 15K 17K 166960K 306 0 rtable 241 10K 10K 166960K 585 0 pf 33 13K 17K 166960K 123 0 ifaddr 39 7K 8K 166960K 91 0 ifgroup 51 2K 2K 166960K 146 0 sysctl 4 1K 9K 166960K 13 0 counters 33 17K 18K 166960K 85 0 ioctlops 0 0K 4K 166960K 241 0 iov 0 0K 16K 166960K 128 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1594 100K 101K 166960K 2682 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 13 16K 16K 166960K 100 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 13 45K 236K 166960K 1161 0 sigio 0 0K 0K 166960K 80 0 proc 61 59K 91K 166960K 642 0 subproc 63 3K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 132 0 in_multi 87 6K 7K 166960K 141 0 ether_multi 1 0K 0K 166960K 14 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 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 544 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 195 134K 158K 166960K 11655 0 UVM aobj 5 6K 8K 166960K 6 0 pinsyscall 34 68K 90K 166960K 2245 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 101 0 NDP 11 0K 2K 166960K 62 0 temp 58 8668K 8922K 166960K 39914 0 kqueue 13 20K 30K 166960K 215 0 SYN cache 2 8K 16K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 110 0 107 1 0 1 1 0 8 0 rtentry 136 169 0 75 4 0 4 4 0 8 0 unpcb 144 795 0 780 6 5 1 6 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 439 0 433 4 3 1 4 0 8 0 arp 96 29 0 9 1 0 1 1 0 8 0 ipq 40 5 0 2 1 0 1 1 0 8 0 ipqe 40 8 0 5 1 0 1 1 0 8 0 inpcb 328 1082 0 1071 8 6 2 7 0 8 0 ip6q 72 2 0 1 1 0 1 1 0 8 0 ip6af 40 4 0 3 1 0 1 1 0 8 0 nd6 112 36 0 15 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 1 0 1 0 8 0 kcovpl 48 9 0 2 1 0 1 1 0 8 0 ppxss 1072 39 0 39 1 0 1 1 0 8 1 pppxif 1384 7 0 7 1 1 0 1 0 8 0 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 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 1344 2 0 2 1 1 0 1 0 8 0 rttmr 136 4 0 4 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 686 0 280 31 5 26 31 0 8 0 art_table 40 689 0 280 5 0 5 5 0 8 0 art_node 32 165 0 80 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 1 0 1 1 0 8 0 semapl 112 89 0 78 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 3476 0 1978 95 0 95 95 0 8 0 ffsino 256 3477 0 1978 95 0 95 95 0 8 0 nchpl 144 5069 0 3374 64 0 64 64 0 8 0 rtmask 32 10 0 10 1 0 1 1 0 8 1 vnodes 216 3220 0 0 179 0 179 179 0 8 0 namei 1024 18031 0 18030 3 2 1 2 0 8 0 vcpupl 3904 2 0 0 1 0 1 1 0 8 0 vmpool 800 3 0 1 1 0 1 1 0 8 0 kstatmem 264 86 0 64 3 1 2 3 0 8 0 scsiplug 72 5 0 5 1 1 0 1 0 8 0 scxspl 216 15291 0 15291 8 7 1 8 1 8 1 plimitpl 152 221 0 205 1 0 1 1 0 8 0 sigapl 424 1431 0 1391 6 1 5 6 0 8 0 knotepl 120 40482 0 40435 11 9 2 11 0 8 0 kqueuepl 184 428 0 419 4 3 1 4 0 8 0 pipepl 304 193 0 165 3 0 3 3 0 8 0 fdescpl 448 1415 0 1390 4 0 4 4 0 8 0 filepl 120 9302 0 9101 12 4 8 12 0 8 0 lockfpl 104 577 0 574 2 1 1 2 0 8 0 lockfspl 48 174 0 171 1 0 1 1 0 8 0 sessionpl 144 22 0 14 1 0 1 1 0 8 0 pgrppl 48 46 0 30 1 0 1 1 0 8 0 ucredpl 104 1435 0 1424 1 0 1 1 0 8 0 zombiepl 144 1404 0 1398 1 0 1 1 0 8 0 processpl 1152 1431 0 1391 4 0 4 4 0 8 0 procpl 664 2909 0 2867 6 1 5 6 0 8 0 sosppl 176 4 0 4 1 1 0 1 0 8 0 sockpl 552 2016 0 1987 12 9 3 12 0 8 0 mcl64k 65536 62 0 62 1 1 0 1 0 8 0 mcl16k 16384 3 0 3 1 1 0 1 0 8 0 mcl12k 12288 1 0 1 1 1 0 1 0 8 0 mcl9k 9216 2 0 2 1 1 0 1 0 8 0 mcl8k 8192 13 0 13 1 1 0 1 0 8 0 mcl4k 4096 3765 0 3712 14 6 8 14 0 8 1 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 1634 0 1629 3 1 2 3 0 8 0 mtagpl 96 48 0 22 1 0 1 1 0 8 0 mbufpl 256 15144 0 14961 25 8 17 25 0 8 0 bufpl 280 7347 0 1126 445 0 445 445 0 8 0 anonpl 24 218169 0 215349 59 33 26 59 0 187 0 amapchunkpl 152 40485 0 40113 34 13 21 33 0 158 0 amappl16 200 4201 0 4174 32 29 3 16 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 7 0 7 1 1 0 1 0 8 0 amappl13 176 433 0 432 1 0 1 1 0 8 0 amappl12 168 1763 0 1729 2 0 2 2 0 8 0 amappl11 160 21 0 21 1 1 0 1 0 8 0 amappl10 152 46 0 36 1 0 1 1 0 8 0 amappl9 144 253 0 253 1 1 0 1 0 8 0 amappl8 136 27 0 26 1 0 1 1 0 8 0 amappl7 128 91 0 89 1 0 1 1 0 8 0 amappl6 120 273 0 262 1 0 1 1 0 8 0 amappl5 112 64 0 57 1 0 1 1 0 8 0 amappl4 104 381 0 356 1 0 1 1 0 8 0 amappl3 96 7868 0 7788 3 0 3 3 0 8 0 amappl2 88 522 0 467 2 0 2 2 0 8 0 amappl1 80 12837 0 12317 12 0 12 12 0 8 0 amappl 88 10775 0 10646 5 0 5 5 0 92 0 uvmvnodes 80 126 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 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 9 0 9 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 5 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1415 0 1390 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1415 0 1390 1 0 1 1 0 8 0 vmmpekpl 168 11931 0 11882 3 0 3 3 0 8 0 vmmpepl 168 93225 0 91644 94 12 82 93 0 357 2 vmsppl 368 1414 0 1390 4 1 3 4 0 8 0 rwobjpl 40 25286 0 24367 13 0 13 13 0 8 0 pdppl 4096 2842 0 2784 98 30 68 76 0 8 10 pvpl 32 615954 0 608199 147 62 85 147 0 265 0 pmappl 216 1417 0 1391 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 389 0 62 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7da890) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a776868) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a776868,0) 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 Xspllower() at Xspllower+0x1d mi_switch() at mi_switch+0x26b sys/kern/sched_bsd.c:409 pool_get(ffffffff8394e288,9) at pool_get+0x21b sys/kern/subr_pool.c:591 ffs_vget(ffff800000b58800,1340a,ffff80002a877270) at ffs_vget+0x104 sys/ufs/ffs/ffs_vfsops.c:1215 ufs_lookup() at ufs_lookup+0x16ad sys/ufs/ufs/ufs_lookup.c:573 VOP_LOOKUP(fffffd8066da27a8,ffff80002a877500,ffff80002a877530) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a8774d0) at vfs_lookup+0x921 sys/kern/vfs_lookup.c:566 namei(ffff80002a8774d0) at namei+0x7ca sys/kern/vfs_lookup.c:250 dofstatat(ffff80002a7b8fa8,ffffff9c,73ea88828610,73ea88828a10,2) at dofstatat+0xe4 sys/kern/vfs_syscalls.c:2086 syscall(ffff80002a877730) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a877730) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73ea88828ac0, count: -18 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7da890) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff837d2fc0,ffff80002a776868) at timeout_run+0xc2 sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a776868,0) 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 Xspllower() at Xspllower+0x1d mi_switch() at mi_switch+0x26b sys/kern/sched_bsd.c:409 pool_get(ffffffff8394e288,9) at pool_get+0x21b sys/kern/subr_pool.c:591 ffs_vget(ffff800000b58800,1340a,ffff80002a877270) at ffs_vget+0x104 sys/ufs/ffs/ffs_vfsops.c:1215 ufs_lookup() at ufs_lookup+0x16ad sys/ufs/ufs/ufs_lookup.c:573 VOP_LOOKUP(fffffd8066da27a8,ffff80002a877500,ffff80002a877530) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a8774d0) at vfs_lookup+0x921 sys/kern/vfs_lookup.c:566 namei(ffff80002a8774d0) at namei+0x7ca sys/kern/vfs_lookup.c:250 dofstatat(ffff80002a7b8fa8,ffffff9c,73ea88828610,73ea88828a10,2) at dofstatat+0xe4 sys/kern/vfs_syscalls.c:2086 syscall(ffff80002a877730) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a877730) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73ea88828ac0, count: -18