uvm_faultuvm_fault(0xffffffff83a4f8f8, 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 *100267 13433 0 0x2 0x1 0 syz-executor kcov_remote_enter(0,ffff80002a7af190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838c8790,ffff80002a746868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746868,0) 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 cnputc(74) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(74) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff833b92a9) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83476b0a) at fault+0xa3 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a85f0e0,ffff800029b92028) at kpageflttrap+0x353 sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a85f0e0) at kerntrap+0x18a sys/arch/amd64/amd64/trap.c:528 end trace frame: 0xffff80002a85f160, 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(0xffffffff83a4f8f8, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7af190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838c8790,ffff80002a746868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746868,0) 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 cnputc(74) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(74) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff833b92a9) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83476b0a) at fault+0xa3 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a85f0e0,ffff800029b92028) at kpageflttrap+0x353 sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a85f0e0) at kerntrap+0x18a sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b ffs2_balloc(fffffd806f134b00,467f8,50,fffffd8007ffd750,1,ffff80002a85f358) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a85f3e0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd807ad37da0,ffff80002a85f490,3,fffffd8007ffd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a746008,fffffd807ad37da0,fffffd8007ffd750,ffff80002a85f560,ffff80002a85f540) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsysret(ffff80002a746008,5b,0,ffff80002a85f620) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a746008,5b,0,ffff80002a85f620) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a85f6d0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a85f6d0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7825a42d5b70, count: -22 ddb> show registers rdi 0 rsi 0xffff800000c16c00 rbp 0xffff80002a85eb70 rbx 0xffff80002a7af190 rdx 0xffff80002a746008 rcx 0xffff800029ef6000 rax 0xfffffd806cd18d80 r8 0x101010101010101 r9 0x8080808080808080 r10 0xbc4080d61d0dba98 r11 0xfd4f8809231374fd r12 0xffffffff82de90c0 endtsleep r13 0xffff80002a7467d0 r14 0xffff80002a7af190 r15 0 rip 0xffffffff818c8122 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a85eb50 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=100267 pid=13433 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=64, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a777c98,0xffff80002a7467e0 process=0xffff80002a7aed10 user=0xffff80002a85a000, vmspace=0xfffffd806fb01178 estcpu=14, cpticks=8, pctcpu=0.1, user=0, sys=7, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 68090 260893 11817 0 2 0 syz-executor 68090 511844 11817 0 2 0x4000000 syz-executor 506 365284 27776 0 3 0x80 nanoslp syz-executor 506 280421 27776 0 3 0x4000080 kqread syz-executor 506 337363 27776 0 3 0x4000080 fsleep syz-executor 506 336231 27776 0 3 0x4000080 fsleep syz-executor 19696 44876 21940 0 2 0xc80 syz-executor 19696 228020 21940 0 2 0x4000c80 syz-executor 6274 201567 71914 0 3 0x80 nanoslp syz-executor 6274 393822 71914 0 3 0x4000080 sbwait syz-executor 28494 345683 31926 60928 3 0x90 nanoslp syz-executor 28494 166717 31926 60928 3 0x4000090 lockf syz-executor 28494 367306 31926 60928 3 0x4000090 fsleep syz-executor 46756 255377 1 0 3 0x82 nanoslp getty 11817 488689 70159 0 3 0x82 nanoslp syz-executor 72163 277862 77372 60929 3 0x3010 suspend syz-executor 72163 362849 77372 60929 2 0x4081010 syz-executor 33674 50146 0 0 3 0x14200 acct acct 27776 12201 70159 0 2 0xc82 syz-executor 31926 109948 70159 0 3 0x82 nanoslp syz-executor 77372 130147 70159 0 3 0x82 nanoslp syz-executor *13433 100267 70159 0 7 0x3 syz-executor 88601 354079 70159 0 3 0x82 wait syz-executor 21940 517090 70159 0 3 0x82 nanoslp syz-executor 71914 57867 70159 0 3 0x82 nanoslp syz-executor 70159 201818 1 0 3 0x82 kqread syz-executor 79076 325321 0 0 3 0x14200 bored smr 33704 321210 0 0 2 0x14200 zerothread 63380 38525 0 0 3 0x14200 aiodoned aiodoned 18791 126822 0 0 3 0x14200 syncer update 1734 62055 0 0 3 0x14200 cleaner cleaner 81689 457428 0 0 3 0x14200 reaper reaper 15103 273237 0 0 3 0x14200 pgdaemon pagedaemon 55421 243687 0 0 3 0x14200 bored viomb 68837 285601 0 0 3 0x40014200 acpi0 acpi0 85203 307765 0 0 3 0x14200 bored softnet0 33749 428453 0 0 3 0x14200 bored systqmp 97819 112031 0 0 3 0x14200 bored systq 54505 45504 0 0 3 0x40014200 tmoslp softclock 49974 207772 0 0 3 0x40014200 idle0 1 103232 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 11033 12221K 13328K 166960K 12754 0 pcb 17 13K 14K 166960K 117 0 rtable 225 6K 6K 166960K 420 0 pf 32 13K 19K 166960K 57 0 ifaddr 38 6K 7K 166960K 54 0 ifgroup 46 2K 2K 166960K 67 0 sysctl 3 1K 9K 166960K 43 0 counters 32 17K 17K 166960K 38 0 ioctlops 0 0K 4K 166960K 157 0 iov 0 0K 12K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1424 90K 90K 166960K 1763 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 65K 236K 166960K 425 0 sigio 0 0K 0K 166960K 12 0 proc 20 25K 116K 166960K 570 0 subproc 72 4K 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 14 0 in_multi 88 6K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 407 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 151 83K 176K 166960K 5349 0 UVM aobj 9 2K 2K 166960K 10 0 pinsyscall 20 40K 96K 166960K 1523 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 12 0 NDP 10 0K 1K 166960K 34 0 temp 49 9068K 9156K 166960K 18804 0 kqueue 4 8K 30K 166960K 87 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 59 0 59 1 0 1 1 0 8 1 rtentry 136 127 0 26 4 0 4 4 0 8 0 unpcb 144 180 0 178 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 84 0 82 2 0 2 2 0 8 1 arp 96 21 0 5 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 1 1 0 1 1 0 8 0 inpcb 328 287 0 283 4 0 4 4 0 8 2 nd6 112 27 0 6 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 2 0 2 1 0 1 1 0 8 1 pffrag 232 36 0 32 1 0 1 1 0 482 0 pffrnode 88 36 0 32 1 0 1 1 0 8 0 pffrent 40 70 0 66 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 2 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 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 499 0 90 29 0 29 29 0 8 3 art_table 40 501 0 90 5 0 5 5 0 8 0 art_node 32 127 0 35 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 7 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2063 0 590 93 0 93 93 0 8 0 ffsino 256 2063 0 590 93 0 93 93 0 8 0 nchpl 144 2632 0 928 64 0 64 64 0 8 0 vnodes 216 2460 0 0 137 0 137 137 0 8 0 namei 1024 8900 0 8900 2 0 2 2 0 8 2 kstatmem 264 32 0 12 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 0 1 1 0 8 1 scxspl 216 13765 0 13765 8 0 8 8 1 8 8 plimitpl 152 176 0 162 1 0 1 1 0 8 0 sigapl 424 701 0 667 6 0 6 6 0 8 1 knotepl 120 14113 0 14089 17 0 17 17 0 8 15 kqueuepl 184 175 0 171 4 0 4 4 0 8 3 pipepl 304 256 0 227 5 0 5 5 0 8 2 fdescpl 448 687 0 667 5 0 5 5 0 8 1 filepl 120 3741 0 3564 11 0 11 11 0 8 3 lockfpl 104 209 0 206 1 0 1 1 0 8 0 lockfspl 48 60 0 58 1 0 1 1 0 8 0 sessionpl 144 34 0 32 1 0 1 1 0 8 0 pgrppl 48 48 0 38 1 0 1 1 0 8 0 ucredpl 104 384 0 379 1 0 1 1 0 8 0 zombiepl 144 670 0 667 1 0 1 1 0 8 0 processpl 1152 701 0 667 4 0 4 4 0 8 0 procpl 664 1124 0 1081 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 552 540 0 534 4 0 4 4 0 8 2 mcl64k 65536 12 0 10 1 0 1 1 0 8 0 mcl16k 16384 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 5 0 5 1 0 1 1 0 8 1 mcl4k 4096 2889 0 2839 13 0 13 13 0 8 6 mcl2k 2048 486 0 481 3 0 3 3 0 8 1 mtagpl 96 8 0 4 1 0 1 1 0 8 0 mbufpl 256 6886 0 6758 15 0 15 15 0 8 3 bufpl 280 6394 0 180 444 0 444 444 0 8 0 anonpl 24 140081 0 134241 64 0 64 64 0 187 18 amapchunkpl 152 17209 0 16787 29 0 29 29 0 158 8 amappl16 200 2447 0 2186 15 0 15 15 0 8 0 amappl15 192 7 0 7 1 0 1 1 0 8 1 amappl14 184 417 0 417 1 0 1 1 0 8 1 amappl13 176 118 0 116 1 0 1 1 0 8 0 amappl12 168 929 0 910 2 0 2 2 0 8 0 amappl11 160 33 0 33 1 0 1 1 0 8 1 amappl10 152 160 0 160 1 0 1 1 0 8 1 amappl9 144 275 0 274 1 0 1 1 0 8 0 amappl8 136 101 0 101 1 0 1 1 0 8 1 amappl7 128 145 0 142 1 0 1 1 0 8 0 amappl6 120 169 0 169 1 0 1 1 0 8 1 amappl5 112 99 0 98 1 0 1 1 0 8 0 amappl4 104 267 0 265 1 0 1 1 0 8 0 amappl3 96 3151 0 3061 4 0 4 4 0 8 0 amappl2 88 527 0 517 2 0 2 2 0 8 0 amappl1 80 10767 0 10645 16 0 16 16 0 8 8 amappl 88 4555 0 4419 5 0 5 5 0 92 0 uvmvnodes 80 113 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 128 254 0 254 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 9 0 1 1 0 1 1 0 8 0 uaddrrnd 24 687 0 667 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 687 0 667 1 0 1 1 0 8 0 vmmpekpl 168 7507 0 7470 2 0 2 2 0 8 0 vmmpepl 168 51986 0 50833 93 0 93 93 0 357 28 vmsppl 368 686 0 667 4 0 4 4 0 8 1 rwobjpl 40 17129 0 16431 13 0 13 13 0 8 0 pdppl 4096 1380 0 1334 104 38 66 82 0 8 20 pvpl 32 339444 0 330222 133 0 133 133 0 265 34 pmappl 216 686 0 667 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 376 0 38 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7af190) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838c8790,ffff80002a746868) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a746868,0) 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 cnputc(74) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(74) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff833b92a9) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83476b0a) at fault+0xa3 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a85f0e0,ffff800029b92028) at kpageflttrap+0x353 sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a85f0e0) at kerntrap+0x18a sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b ffs2_balloc(fffffd806f134b00,467f8,50,fffffd8007ffd750,1,ffff80002a85f358) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a85f3e0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd807ad37da0,ffff80002a85f490,3,fffffd8007ffd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a746008,fffffd807ad37da0,fffffd8007ffd750,ffff80002a85f560,ffff80002a85f540) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsysret(ffff80002a746008,5b,0,ffff80002a85f620) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a746008,5b,0,ffff80002a85f620) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a85f6d0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a85f6d0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7825a42d5b70, count: -22 ddb>