uvm_fault(0xffffffff83a57a48, 0xffff800029ed6000, 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 * 56634 80847 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80002a78db10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8389c360,ffff80002a726868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a726868,0) 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,ffffffff82967e60,ffff800000039000) at writedisklabel+0x1b5 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001601000,3,ffff80002a726538) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffff7006320c960,84946467,ffff800001601000,3,fffff70007ffd680,ffff80002a726538) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffff7006f23a3c0,84946467,ffff800001601000,ffff80002a726538) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002a726538,ffff80002a795e50,ffff80002a795da0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80002a795e50) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a795e50) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe21f6ce25e0, 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(0xffffffff83a57a48, 0xffff800029ed6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a78db10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8389c360,ffff80002a726868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a726868,0) 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,ffffffff82967e60,ffff800000039000) at writedisklabel+0x1b5 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001601000,3,ffff80002a726538) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffff7006320c960,84946467,ffff800001601000,3,fffff70007ffd680,ffff80002a726538) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffff7006f23a3c0,84946467,ffff800001601000,ffff80002a726538) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002a726538,ffff80002a795e50,ffff80002a795da0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80002a795e50) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a795e50) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe21f6ce25e0, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a7957c0 rbx 0xffff80002a78db10 rdx 0xffff80002a726538 rcx 0xffff800029ed6000 rax 0xfffff7006be16ea0 r8 0xffff80002a795948 r9 0 r10 0x54743a029fab40f8 r11 0xf8443ee3e296e48 r12 0xffffffff81658bd0 endtsleep r13 0xffff80002a7267d0 r14 0xffff80002a78db10 r15 0 rip 0xffffffff81a6f4a2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a7957a0 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=56634 pid=80847 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a726d00,0xffffffff839b4810 process=0xffff807fffff9218 user=0xffff80002a790000, vmspace=0xfffff700760505c0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 80847 511559 55578 0 2 0 syz-executor *80847 56634 55578 0 7 0x4000000 syz-executor 48975 31868 2421 0 2 0 syz-executor 48975 511213 2421 0 3 0x4000080 fsleep syz-executor 19663 321805 35066 0 2 0 syz-executor 19663 450279 35066 0 3 0x4000080 ttyout syz-executor 34478 456378 20958 0 2 0 syz-executor 34478 343717 20958 0 3 0x4000080 fsleep syz-executor 15300 397260 58808 0 2 0 syz-executor 15300 285167 58808 0 3 0x4000080 fsleep syz-executor 15300 475441 58808 0 3 0x4000080 fsleep syz-executor 15300 493920 58808 0 3 0x4000080 fsleep syz-executor 35066 7940 38897 0 3 0x82 nanoslp syz-executor 98533 259600 1 0 3 0x100083 ttyin getty 99821 470667 38897 0 3 0x82 piperd syz-executor 76023 158611 38897 0 3 0x82 piperd syz-executor 55578 472512 38897 0 3 0x82 nanoslp syz-executor 41393 213554 38897 0 3 0x82 piperd syz-executor 58808 34650 38897 0 3 0x82 nanoslp syz-executor 2421 188996 38897 0 3 0x82 nanoslp syz-executor 20958 26098 38897 0 3 0x82 nanoslp syz-executor 38897 31145 1 0 2 0x2 syz-executor 85149 121299 0 0 3 0x14200 bored smr 82439 346771 0 0 2 0x14200 zerothread 18487 398567 0 0 3 0x14200 aiodoned aiodoned 48669 510292 0 0 3 0x14200 syncer update 42800 171630 0 0 3 0x14200 cleaner cleaner 10910 135281 0 0 3 0x14200 reaper reaper 24405 266278 0 0 3 0x14200 pgdaemon pagedaemon 19182 512067 0 0 3 0x14200 bored viomb 7960 273902 0 0 3 0x40014200 acpi0 acpi0 20727 426205 0 0 3 0x14200 bored softnet0 91337 30938 0 0 3 0x14200 bored systqmp 66189 107641 0 0 3 0x14200 bored systq 39960 267579 0 0 3 0x40014200 tmoslp softclock 77728 198297 0 0 3 0x40014200 idle0 1 300319 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 11048 12099K 13284K 166960K 13157 0 pcb 18 13K 13K 166960K 85 0 rtable 222 10K 11K 166960K 514 0 pf 29 13K 92K 166960K 150 0 ifaddr 34 6K 7K 166960K 70 0 ifgroup 42 1K 2K 166960K 98 0 sysctl 4 1K 9K 166960K 111 0 counters 31 17K 18K 166960K 122 0 ioctlops 1 2K 4K 166960K 322 0 iov 0 0K 16K 166960K 23 0 mount 1 1K 1K 166960K 1 0 log 3 0K 0K 166960K 7 0 vnodes 1446 91K 92K 166960K 1962 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 24K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 97 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 53K 97K 166960K 562 0 sigio 0 0K 0K 166960K 8 0 proc 20 25K 124K 166960K 599 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 34 0 in_multi 77 5K 7K 166960K 139 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 13 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 494 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 121 82K 165K 166960K 6690 0 UVM aobj 13 2K 2K 166960K 13 0 pinsyscall 17 34K 96K 166960K 1718 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 22 0 NDP 9 0K 2K 166960K 47 0 temp 52 9113K 13212K 166960K 18553 0 kqueue 1 2K 25K 166960K 88 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 60 0 60 1 0 1 1 0 8 1 rtentry 136 145 0 55 4 0 4 4 0 8 0 unpcb 144 596 0 596 9 4 5 6 0 8 5 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpcb 736 140 0 139 4 0 4 4 0 8 3 arp 96 25 0 10 1 0 1 1 0 8 0 inpcb 328 538 0 536 7 0 7 7 0 8 6 nd6 112 31 0 12 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1072 83 0 83 2 1 1 1 0 8 1 pppxif 1416 2 0 2 2 1 1 1 0 8 1 pfstscr 40 4 0 2 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 35 0 34 1 0 1 1 0 8 0 pfrktable 1344 4 0 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 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 6 0 3 1 0 1 1 0 8 0 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 256 602 0 230 31 4 27 29 0 8 1 art_table 40 604 0 230 5 0 5 5 0 8 0 art_node 32 145 0 63 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 93 0 83 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2392 0 932 92 0 92 92 0 8 0 ffsino 256 2392 0 932 92 0 92 92 0 8 0 nchpl 144 3266 0 1565 64 0 64 64 0 8 0 rtmask 32 5 0 5 2 1 1 1 0 8 1 vnodes 216 2867 0 0 160 0 160 160 0 8 0 namei 1024 11639 0 11639 2 1 1 2 0 8 1 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 55 0 36 2 0 2 2 0 8 0 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 16483 0 16483 11 3 8 8 1 8 8 plimitpl 152 91 0 79 1 0 1 1 0 8 0 sigapl 424 854 0 824 6 1 5 6 0 8 0 knotepl 120 17175 0 17158 23 12 11 15 0 8 8 kqueuepl 184 209 0 208 5 1 4 4 0 8 3 pipepl 304 155 0 128 3 0 3 3 0 8 0 fdescpl 448 841 0 824 5 1 4 5 0 8 0 filepl 120 5505 0 5349 16 4 12 14 0 8 3 lockfpl 104 425 0 424 3 1 2 2 0 8 1 lockfspl 48 74 0 73 1 0 1 1 0 8 0 sessionpl 144 73 0 70 1 0 1 1 0 8 0 pgrppl 48 85 0 74 1 0 1 1 0 8 0 ucredpl 104 950 0 947 1 0 1 1 0 8 0 zombiepl 144 824 0 824 1 0 1 1 0 8 1 processpl 1152 854 0 824 4 0 4 4 0 8 0 procpl 664 1455 0 1418 6 0 6 6 0 8 1 sosppl 176 3 0 3 2 1 1 1 0 8 1 sockpl 552 1216 0 1214 20 10 10 12 0 8 8 mcl64k 65536 13 0 13 2 1 1 1 0 8 1 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl9k128 9344 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 13 0 13 2 1 1 1 0 8 1 mcl4k 4096 3065 0 3009 15 6 9 14 0 8 1 mcl2k 2048 527 0 525 4 3 1 4 0 8 0 mtagpl 96 9 0 6 1 0 1 1 0 8 0 mbufpl 256 8622 0 8497 15 1 14 14 0 8 3 bufpl 272 6431 0 216 415 0 415 415 0 8 0 anonpl 24 128425 0 126651 81 3 78 78 0 88 41 amapchunkpl 152 21673 0 21356 39 7 32 32 0 158 16 amappl16 200 1987 0 1945 28 11 17 28 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 441 0 441 1 0 1 1 0 8 1 amappl13 176 118 0 117 1 0 1 1 0 8 0 amappl12 168 1090 0 1074 2 0 2 2 0 8 0 amappl11 160 20 0 20 1 1 0 1 0 8 0 amappl10 152 75 0 75 1 0 1 1 0 8 1 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 101 0 101 1 0 1 1 0 8 1 amappl7 128 149 0 146 1 0 1 1 0 8 0 amappl6 120 168 0 167 1 0 1 1 0 8 0 amappl5 112 94 0 92 1 0 1 1 0 8 0 amappl4 104 280 0 277 1 0 1 1 0 8 0 amappl3 96 4163 0 4090 4 0 4 4 0 8 0 amappl2 88 544 0 535 2 0 2 2 0 8 0 amappl1 80 12010 0 11900 14 2 12 14 0 8 5 amappl 88 5892 0 5785 5 0 5 5 0 92 1 uvmvnodes 80 109 0 0 3 0 3 3 0 8 0 dma32768 32768 3 0 3 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 24 841 0 824 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 841 0 824 1 0 1 1 0 8 0 vmmpekpl 168 8124 0 8084 2 0 2 2 0 8 0 vmmpepl 168 60614 0 59844 103 0 103 103 0 357 55 vmsppl 368 840 0 824 4 1 3 4 0 8 0 rwobjpl 40 18786 0 18337 16 0 16 16 0 8 1 pdppl 4096 1688 0 1648 104 58 46 82 0 8 6 pvpl 32 361963 0 357453 152 3 149 149 0 265 83 pmappl 216 840 0 824 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 800 0 81 21 0 21 21 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a78db10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8389c360,ffff80002a726868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a726868,0) 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,ffffffff82967e60,ffff800000039000) at writedisklabel+0x1b5 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001601000,3,ffff80002a726538) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffff7006320c960,84946467,ffff800001601000,3,fffff70007ffd680,ffff80002a726538) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffff7006f23a3c0,84946467,ffff800001601000,ffff80002a726538) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002a726538,ffff80002a795e50,ffff80002a795da0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80002a795e50) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a795e50) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe21f6ce25e0, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a78db10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8389c360,ffff80002a726868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a726868,0) 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,ffffffff82967e60,ffff800000039000) at writedisklabel+0x1b5 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001601000,3,ffff80002a726538) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffff7006320c960,84946467,ffff800001601000,3,fffff70007ffd680,ffff80002a726538) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffff7006f23a3c0,84946467,ffff800001601000,ffff80002a726538) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002a726538,ffff80002a795e50,ffff80002a795da0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80002a795e50) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a795e50) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe21f6ce25e0, count: -14 ddb>