login: uvm_fault(0xfffffd806b8caa68, 0x4, 0, 1) -> e kernel: page fault trap, code=0 Stopped at igmp_leavegroup+0xaf: movl 0x4(%rax),%r12d TID PID UID PRFLAGS PFLAGS CPU COMMAND igmp_leavegroup(ffff800000e38280,ffff8000006ac000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512 in_delmulti(ffff800000e38280) at in_delmulti+0xd3 sys/netinet/in.c:908 ip_freemoptions(ffff8000006bc420) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1737 in_pcbdetach(fffffd80771fe008) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:606 udp_detach(ffff800000e2a258) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1139 soclose(ffff800000e2a258,0) at soclose+0x83 pru_detach sys/sys/protosw.h:283 [inline] soclose(ffff800000e2a258,0) at soclose+0x83 sys/kern/uipc_socket.c:410 soo_close(fffffd8068a4b308,ffff80002ccbea68) at soo_close+0x44 fdrop(fffffd8068a4b308,ffff80002ccbea68) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd8068a4b308,ffff80002ccbea68) at closef+0x120 sys/kern/kern_descrip.c:1258 fdfree(ffff80002ccbea68) at fdfree+0xe4 sys/kern/kern_descrip.c:1190 exit1(ffff80002ccbea68,0,0,1) at exit1+0x38a sys/kern/kern_exit.c:199 sys_exit(ffff80002ccbea68,ffff80002a480540,ffff80002a480490) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a480540) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002a480540) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76cb346233d0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xfffffd806b8caa68, 0x4, 0, 1) -> e ddb{0}> trace igmp_leavegroup(ffff800000e38280,ffff8000006ac000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512 in_delmulti(ffff800000e38280) at in_delmulti+0xd3 sys/netinet/in.c:908 ip_freemoptions(ffff8000006bc420) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1737 in_pcbdetach(fffffd80771fe008) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:606 udp_detach(ffff800000e2a258) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1139 soclose(ffff800000e2a258,0) at soclose+0x83 pru_detach sys/sys/protosw.h:283 [inline] soclose(ffff800000e2a258,0) at soclose+0x83 sys/kern/uipc_socket.c:410 soo_close(fffffd8068a4b308,ffff80002ccbea68) at soo_close+0x44 fdrop(fffffd8068a4b308,ffff80002ccbea68) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd8068a4b308,ffff80002ccbea68) at closef+0x120 sys/kern/kern_descrip.c:1258 fdfree(ffff80002ccbea68) at fdfree+0xe4 sys/kern/kern_descrip.c:1190 exit1(ffff80002ccbea68,0,0,1) at exit1+0x38a sys/kern/kern_exit.c:199 sys_exit(ffff80002ccbea68,ffff80002a480540,ffff80002a480490) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a480540) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002a480540) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76cb346233d0, count: -14 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a4800e0 rbx 0xc rdx 0 rcx 0xffff80002ccbea68 rax 0 r8 0xffffffffffffffff r9 0x32a00 acpi_pdirpa+0x1e871 r10 0x511c0741e2ae995 r11 0x965e5f4ad267e8b2 r12 0 r13 0x3 r14 0xffff800000e38280 r15 0xffff8000006ac000 rip 0xffffffff81f993ef igmp_leavegroup+0xaf cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a4800b0 ss 0x10 igmp_leavegroup+0xaf: movl 0x4(%rax),%r12d ddb{0}> show proc PROC (syz-executor.0) tid=93848 pid=37973 tcnt=1 stat=onproc flags process=8001008 proc=2000 runpri=32, usrpri=78, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002ccbea68 forw=0xffffffffffffffff, list=0xffff8000fffeea78,0xffff80002a156fb0 process=0xffff80002a159638 user=0xffff80002a47b000, vmspace=0xfffffd806b8caa68 estcpu=28, cpticks=1, pctcpu=0.5, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10923 102233 35824 0 3 0x8000082 piperd syz-executor.1 81109 517363 46291 0 3 0x8000080 nanoslp syz-executor.2 81109 353302 46291 0 3 0xc000080 msgwait syz-executor.2 81109 295062 46291 0 3 0xc000080 fsleep syz-executor.2 97211 488387 79657 0 3 0x8000080 nanoslp syz-executor.7 97211 61294 79657 0 3 0xc000080 dtread syz-executor.7 97211 144748 79657 0 3 0xc000080 fsleep syz-executor.7 49687 151211 1 0 3 0x18100083 ttyin getty 79657 360298 35824 0 3 0x8000082 nanoslp syz-executor.7 70844 465324 0 0 3 0x14200 acct acct 48196 202784 0 0 3 0x14200 bored sosplice 85140 480998 0 0 3 0x14280 nfsidl nfsio 67289 228084 0 0 3 0x14280 nfsidl nfsio 61680 77603 0 0 3 0x14280 nfsidl nfsio 76813 71234 0 0 3 0x14280 nfsidl nfsio 59097 183429 0 0 3 0x14280 nfsidl nfsio 69867 47815 0 0 3 0x14280 nfsidl nfsio 6083 311961 0 0 3 0x14280 nfsidl nfsio 65812 393298 0 0 3 0x14280 nfsidl nfsio 67752 44701 0 0 3 0x14280 nfsidl nfsio 3015 190666 0 0 3 0x14280 nfsidl nfsio 51404 26461 0 0 3 0x14280 nfsidl nfsio 2168 391151 0 0 3 0x14280 nfsidl nfsio 68446 400861 0 0 3 0x14280 nfsidl nfsio 39127 96369 0 0 3 0x14280 nfsidl nfsio 64853 500570 0 0 3 0x14280 nfsidl nfsio 45156 44896 0 0 3 0x14280 nfsidl nfsio 69293 164930 0 0 3 0x14280 nfsidl nfsio 2826 300803 0 0 3 0x14280 nfsidl nfsio 86956 236483 0 0 3 0x14280 nfsidl nfsio 77577 178713 0 0 3 0x14280 nfsidl nfsio 83155 97797 35824 0 3 0x8000082 piperd syz-executor.6 92315 435241 35824 0 3 0x8000082 piperd syz-executor.4 37063 325674 35824 0 3 0x8000082 piperd syz-executor.3 46291 59026 35824 0 3 0x8000082 nanoslp syz-executor.2 14715 506893 35824 0 3 0x8000082 nanoslp syz-executor.0 35824 39322 88102 0 3 0x1a000082 wait syz-fuzzer 35824 451790 88102 0 3 0x1e000082 nanoslp syz-fuzzer 35824 381716 88102 0 3 0x1e000082 thrsleep syz-fuzzer 35824 265186 88102 0 3 0x1e000082 wait syz-fuzzer 35824 344188 88102 0 3 0x1e000082 kqread syz-fuzzer 35824 491356 88102 0 3 0x1e000082 thrsleep syz-fuzzer 35824 404947 88102 0 3 0x1e000082 thrsleep syz-fuzzer 35824 425395 88102 0 3 0x1e000082 wait syz-fuzzer 35824 380280 88102 0 3 0x1e000082 wait syz-fuzzer 35824 331207 88102 0 3 0x1e000082 wait syz-fuzzer 35824 462242 88102 0 3 0x1e000082 thrsleep syz-fuzzer 35824 154220 88102 0 3 0x1e000082 wait syz-fuzzer 35824 268456 88102 0 3 0x1e000082 thrsleep syz-fuzzer 35824 69182 88102 0 3 0x1e000082 thrsleep syz-fuzzer 35824 232666 88102 0 3 0x1e000082 wait syz-fuzzer 35824 308581 88102 0 3 0x1e000082 thrsleep syz-fuzzer 88102 155002 23940 0 3 0x810008a sigsusp ksh 23940 139533 99726 0 3 0x1800009a kqread sshd 99726 419112 1 0 3 0x18000088 kqread sshd 31755 369351 15351 74 3 0x19100092 bpf pflogd 15351 1897 1 0 3 0x18000080 sbwait pflogd 44736 253252 94754 73 3 0x19100090 kqread syslogd 94754 48876 1 0 3 0x18100082 sbwait syslogd 7929 70924 1 0 3 0x18100080 kqread resolvd 76765 99910 77362 77 3 0x18100092 kqread dhcpleased 8266 480632 77362 77 3 0x18100092 kqread dhcpleased 77362 29457 1 0 3 0x18000080 kqread dhcpleased 23071 388045 0 0 3 0x14200 bored smr 75673 499897 0 0 3 0x14200 pgzero zerothread 69068 73161 0 0 3 0x14200 aiodoned aiodoned 25067 253762 0 0 3 0x14200 syncer update 74884 70452 0 0 3 0x14200 cleaner cleaner 67394 212798 0 0 3 0x14200 reaper reaper 34955 196180 0 0 3 0x14200 pgdaemon pagedaemon 49116 417174 0 0 3 0x14200 bored viomb 97863 353594 0 0 3 0x40014200 acpi0 acpi0 21324 413449 0 0 7 0x40014200 idle1 60744 1968 0 0 3 0x14200 bored softnet3 19777 514289 0 0 3 0x14200 bored softnet2 10878 196834 0 0 3 0x14200 bored softnet1 39562 315861 0 0 3 0x14200 bored softnet0 89947 182745 0 0 3 0x14200 bored systqmp 12115 167683 0 0 3 0x14200 bored systq 17447 400809 0 0 3 0x14200 tmoslp softclockmp 58159 430713 0 0 3 0x40014200 tmoslp softclock 34732 41033 0 0 3 0x40014200 idle0 1 190372 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10188 6511K 6733K 166960K 11455 0 pcb 15 12K 13K 166960K 70 0 rtable 168 9K 10K 166960K 526 0 pf 37 10K 10K 166960K 67 0 ifaddr 36 13K 15K 166960K 73 0 ifgroup 64 2K 2K 166960K 95 0 sysctl 2 0K 0K 166960K 2 0 counters 68 36K 37K 166960K 86 0 ioctlops 0 0K 4K 166960K 1528 0 iov 0 0K 16K 166960K 39 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1375 87K 87K 166960K 1562 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 12 41K 85K 166960K 583 0 sigio 0 0K 0K 166960K 7 0 proc 72 91K 128K 166960K 675 0 subproc 91 5K 6K 166960K 156 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 61 0 in_multi 62 4K 7K 166960K 161 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 461 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 274 85K 95K 166960K 7425 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 36 72K 108K 166960K 1867 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 26 0 NDP 16 0K 2K 166960K 48 0 temp 53 6807K 6874K 166960K 12697 0 kqueue 12 18K 26K 166960K 88 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 67 0 64 1 0 1 1 0 8 0 rtentry 112 166 0 93 4 0 4 4 0 8 0 unpcb 144 385 0 368 3 1 2 2 0 8 1 syncache 336 6 0 6 1 1 0 1 0 8 0 tcpqe 32 142 0 142 2 2 0 1 0 8 0 tcpcb 808 161 0 153 2 0 2 2 0 8 0 arp 120 27 0 17 1 0 1 1 0 8 0 inpcb 392 657 0 646 9 0 9 9 0 8 7 nd6 136 40 0 25 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 12 0 5 1 0 1 1 0 8 0 ppxss 1168 3 0 3 2 1 1 1 0 8 1 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 6 0 2 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 47 0 11 1 0 1 1 0 8 0 pfstkey 128 47 0 11 2 0 2 2 0 8 0 pfstate 376 47 0 11 4 0 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 690 0 365 29 3 26 29 0 8 5 art_table 32 691 0 365 4 0 4 4 0 8 0 art_node 16 165 0 99 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 0 1 1 0 8 1 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 26 0 16 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2191 0 666 96 0 96 96 0 8 0 ffsino 272 2191 0 666 103 0 103 103 0 8 0 nchpl 144 3063 0 1327 67 0 67 67 0 8 0 uvmvnodes 80 2427 0 0 50 0 50 50 0 8 0 vnodes 216 2427 0 0 135 0 135 135 0 8 0 namei 1024 10253 0 10253 3 2 1 3 0 8 1 percpumem 16 57 0 9 1 0 1 1 0 8 0 vcpupl 2048 34 0 0 5 0 5 5 0 8 0 vmpool 696 34 0 0 4 0 4 4 0 8 0 kstatmem 264 46 0 18 3 0 3 3 0 8 0 scxspl 216 10897 0 10897 10 8 2 8 1 8 2 plimitpl 152 74 0 59 1 0 1 1 0 8 0 sigapl 424 915 0 850 9 0 9 9 0 8 0 futexpl 64 5699 0 5697 1 0 1 1 0 8 0 knotepl 120 164 0 0 5 0 5 5 0 8 0 kqueuepl 216 190 0 182 1 0 1 1 0 8 0 pipepl 320 206 0 181 3 0 3 3 0 8 0 fdescpl 496 875 0 850 5 0 5 5 0 8 0 filepl 152 4368 0 4144 13 0 13 13 0 8 3 lockfpl 104 92 0 90 1 0 1 1 0 8 0 lockfspl 48 42 0 40 1 0 1 1 0 8 0 sessionpl 144 29 0 13 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 376 0 363 1 0 1 1 0 8 0 zombiepl 144 851 0 850 1 0 1 1 0 8 0 processpl 1136 915 0 850 6 0 6 6 0 8 0 procpl 656 1435 0 1351 9 0 9 9 0 8 0 srpgc 96 6 0 6 2 1 1 1 0 8 1 sosppl 168 9 0 9 2 1 1 1 0 8 1 sockpl 584 1121 0 1090 9 0 9 9 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 8 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 369 0 0 47 0 47 47 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 387 0 0 25 0 25 25 0 8 0 bufpl 280 5192 0 189 358 0 358 358 0 8 0 anonpl 24 280228 0 274612 68 4 64 67 0 186 13 amapchunkpl 152 23974 0 23384 31 0 31 31 0 158 2 amappl16 200 8234 0 8098 27 12 15 23 0 8 6 amappl15 192 14 0 14 1 1 0 1 0 8 0 amappl14 184 172 0 156 2 1 1 2 0 8 0 amappl13 176 13 0 13 1 1 0 1 0 8 0 amappl12 168 1622 0 1591 4 2 2 3 0 8 0 amappl11 160 80 0 66 1 0 1 1 0 8 0 amappl10 152 60 0 52 1 0 1 1 0 8 0 amappl9 144 449 0 447 1 0 1 1 0 8 0 amappl8 136 188 0 134 3 0 3 3 0 8 0 amappl7 128 77 0 64 1 0 1 1 0 8 0 amappl6 120 478 0 460 2 1 1 2 0 8 0 amappl5 112 195 0 180 1 0 1 1 0 8 0 amappl4 104 600 0 557 3 1 2 3 0 8 0 amappl3 96 4162 0 4096 3 0 3 3 0 8 0 amappl2 88 1267 0 1196 4 2 2 4 0 8 0 amappl1 80 11693 0 11161 23 10 13 23 0 8 0 amappl 88 6804 0 6631 6 0 6 6 0 92 0 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 128 253 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 909 0 850 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 909 0 850 1 0 1 1 0 8 0 vmmpekpl 168 11194 0 11129 4 0 4 4 0 8 0 vmmpepl 168 76177 0 74298 121 12 109 121 0 357 14 vmsppl 440 908 0 850 9 1 8 8 0 8 0 rwobjpl 56 29467 0 25890 54 2 52 52 0 8 0 pdppl 4096 1825 0 1734 138 37 101 103 0 8 10 pvpl 32 49100 0 0 396 0 396 396 0 265 0 pmappl 248 908 0 850 5 0 5 5 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 471 0 46 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace igmp_leavegroup(ffff800000e38280,ffff8000006ac000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512 in_delmulti(ffff800000e38280) at in_delmulti+0xd3 sys/netinet/in.c:908 ip_freemoptions(ffff8000006bc420) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1737 in_pcbdetach(fffffd80771fe008) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:606 udp_detach(ffff800000e2a258) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1139 soclose(ffff800000e2a258,0) at soclose+0x83 pru_detach sys/sys/protosw.h:283 [inline] soclose(ffff800000e2a258,0) at soclose+0x83 sys/kern/uipc_socket.c:410 soo_close(fffffd8068a4b308,ffff80002ccbea68) at soo_close+0x44 fdrop(fffffd8068a4b308,ffff80002ccbea68) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd8068a4b308,ffff80002ccbea68) at closef+0x120 sys/kern/kern_descrip.c:1258 fdfree(ffff80002ccbea68) at fdfree+0xe4 sys/kern/kern_descrip.c:1190 exit1(ffff80002ccbea68,0,0,1) at exit1+0x38a sys/kern/kern_exit.c:199 sys_exit(ffff80002ccbea68,ffff80002a480540,ffff80002a480490) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a480540) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002a480540) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76cb346233d0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: -5