panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336edd9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833afff6,ffffffff833c2f1e,3b7,ffffffff833ed01e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a36f518,ffffffff8336a3ec) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80002a36f510) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a3d6d38) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c46bb90) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806ea0a950,1,fffffd80097fb3a8,ffff80002a3d6d38) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805b3f1328,ffff80002a3d6d38) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805b3f1328,ffff80002a3d6d38) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805b3f1328,ffff80002a3d6d38) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805b3f1328,ffff80002a3d6d38) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a3d6d38) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a3d6d38,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a3d6d38,ffff80003c46bf00,ffff80003c46be50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c46bef0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336edd9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833afff6,ffffffff833c2f1e,3b7,ffffffff833ed01e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a36f518,ffffffff8336a3ec) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80002a36f510) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a3d6d38) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c46bb90) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806ea0a950,1,fffffd80097fb3a8,ffff80002a3d6d38) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805b3f1328,ffff80002a3d6d38) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805b3f1328,ffff80002a3d6d38) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805b3f1328,ffff80002a3d6d38) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805b3f1328,ffff80002a3d6d38) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a3d6d38) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a3d6d38,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a3d6d38,ffff80003c46bf00,ffff80003c46be50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c46bf00) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c46bf00) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x739508c575b0, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c46b960 rbx 0xffffffff83838ddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff80002a3d6d38 rax 0xffffffff83837ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8284e2ff87ecb0de r11 0xe2d7e45d91b358e9 r12 0xffffffff83838be0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff83152035 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c46b950 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=298910 pid=90798 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a3d6d38 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a3d7798,0xffff800038014fd0 process=0xffff80003ac26720 user=0xffff80003c466000, vmspace=0xfffffd805b6a29b0 estcpu=30, cpticks=3, pctcpu=0.1, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39877 52511 58504 -1 2 0x10 syz-executor 39877 190404 58504 -1 3 0x4000010 smrbar syz-executor 49334 177180 61402 0 2 0 syz-executor 49334 414412 61402 0 3 0x4000080 fsleep syz-executor 67908 365670 38180 0 2 0 syz-executor 67908 493642 38180 0 3 0x4000080 fsleep syz-executor 21860 522751 12236 0 2 0 syz-executor 21860 18985 12236 0 2 0x4000000 syz-executor 21860 426947 12236 0 2 0x4000000 syz-executor 5573 234308 73000 0 2 0 syz-executor 5573 516934 73000 0 3 0x4000080 ttyout syz-executor 68988 396644 65291 60929 3 0x90 nanoslp syz-executor 68988 241118 65291 60929 3 0x4000090 pipewr syz-executor 68988 447813 65291 60929 3 0x4000090 lockf syz-executor 61402 295906 3113 0 2 0xc82 syz-executor 41580 497692 1 0 3 0x100083 ttyin getty 73000 208044 3113 0 2 0x2 syz-executor 88087 183695 3113 0 3 0x82 wait syz-executor 38180 278988 3113 0 2 0xc82 syz-executor 12236 27801 3113 0 3 0x82 nanoslp syz-executor 58504 5652 3113 0 3 0x82 nanoslp syz-executor 14187 9102 0 0 3 0x14200 bored sosplice 65291 439031 3113 0 2 0xc82 syz-executor 19718 367568 3113 0 2 0xc82 syz-executor 3113 37530 68354 0 2 0x2 syz-executor 68354 40849 64486 0 3 0x10008a sigsusp ksh 64486 86875 42277 0 3 0x98 kqread sshd-session 42277 292899 99634 0 3 0x92 kqread sshd-session 99634 274331 1 0 3 0x88 kqread sshd 12540 509408 41851 74 3 0x1100092 bpf pflogd 41851 81959 1 0 3 0x80 sbwait pflogd 32963 254807 22718 73 3 0x1100090 kqread syslogd 22718 172831 1 0 3 0x100082 sbwait syslogd 8539 521283 1 0 3 0x100080 kqread resolvd 20145 169804 3145 77 3 0x100092 kqread dhcpleased 32437 387879 3145 77 3 0x100092 kqread dhcpleased 3145 289533 1 0 3 0x80 kqread dhcpleased 36282 350773 0 0 3 0x14200 bored smr 71262 67382 0 0 2 0x14200 zerothread 56160 82965 0 0 3 0x14200 aiodoned aiodoned 56611 509748 0 0 3 0x14200 syncer update 57116 145759 0 0 3 0x14200 cleaner cleaner 48909 468927 0 0 3 0x14200 reaper reaper 44622 322155 0 0 3 0x14200 pgdaemon pagedaemon 97542 48757 0 0 3 0x14200 bored viomb 31138 406408 0 0 3 0x40014200 acpi0 acpi0 60886 489080 0 0 7 0x40014200 idle1 95553 370212 0 0 3 0x14200 bored softnet7 97739 45656 0 0 3 0x14200 bored softnet6 34392 389956 0 0 3 0x14200 bored softnet5 90536 452453 0 0 3 0x14200 bored softnet4 8857 38849 0 0 3 0x14200 bored softnet3 33312 86797 0 0 3 0x14200 bored softnet2 85068 146774 0 0 3 0x14200 bored softnet1 53438 237619 0 0 3 0x14200 bored softnet0 24415 160531 0 0 3 0x14200 bored systqmp 64277 88216 0 0 3 0x14200 bored systq 77919 129725 0 0 3 0x14200 tmoslp softclockmp 27713 74376 0 0 2 0x40014200 softclock 49517 156931 0 0 3 0x40014200 idle0 1 233340 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 21860 (syz-executor) thread 0xffff800038014030 (18985) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10257 11059K 11845K 166960K 15284 0 pcb 18 18K 23K 166960K 983 0 rtable 252 16K 16K 166960K 1265 0 pf 42 18K 67486K 166960K 389 0 ifaddr 46 9K 9K 166960K 233 0 ifgroup 71 3K 3K 166960K 422 0 sysctl 4 1K 9K 166960K 95 0 counters 76 37K 38K 166960K 742 0 ioctlops 0 0K 4K 166960K 2322 0 iov 0 0K 34K 166960K 291 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1554 98K 98K 166960K 4686 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 40K 44K 166960K 40 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 187 0 dirhash 12 2K 2K 166960K 78 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 3422 0 sigio 0 0K 0K 166960K 139 0 proc 72 115K 164K 166960K 1132 0 subproc 72 4K 4K 166960K 144 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 498 0 in_multi 102 7K 7K 166960K 315 0 ether_multi 2 0K 0K 166960K 42 0 mrt 1 0K 0K 166960K 29 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 945 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 10 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 258 178K 192K 166960K 31710 0 UVM aobj 31 2K 4K 166960K 37 0 pinsyscall 43 86K 101K 166960K 4730 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 252 0 NDP 15 0K 2K 166960K 174 0 temp 111 8652K 8750K 166960K 202595 0 kqueue 15 24K 31K 166960K 690 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 393 0 388 5 4 1 3 0 8 0 rtentry 176 474 0 387 6 2 4 5 0 8 0 unpcb 144 2351 0 2334 16 14 2 6 0 8 1 syncache 336 5 0 5 3 3 0 1 0 8 0 tcpcb 736 1568 0 1562 37 34 3 7 0 8 2 arp 128 98 0 88 1 0 1 1 0 8 0 inpcb 328 4580 0 4568 59 51 8 12 0 8 6 nd6 144 41 0 20 1 0 1 1 0 8 0 pkpcb 40 73 0 73 8 7 1 1 0 8 1 kcovpl 48 16 0 8 1 0 1 1 0 8 0 mppekey 1024 70 0 70 4 3 1 1 0 8 1 ppxss 1192 297 0 296 5 4 1 1 0 8 0 pppxif 1504 49 0 48 7 6 1 1 0 8 0 pffrag 232 24 0 14 1 0 1 1 0 482 0 pffrnode 88 23 0 13 1 0 1 1 0 8 0 pffrent 40 101 0 91 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 pfrktable 1344 7 0 6 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 38 0 30 1 0 1 1 0 8 0 pfstkey 128 38 0 30 1 0 1 1 0 8 0 pfstate 384 38 0 30 3 0 3 3 0 8 0 pfrule 1344 25 0 19 2 1 1 2 0 8 0 rttmr 136 5 0 5 3 3 0 1 0 8 0 art_heap8 4096 6 0 1 6 1 5 5 0 8 0 art_heap4 256 1473 0 1002 54 23 31 43 0 8 1 art_table 40 1479 0 1003 7 1 6 7 0 8 1 art_node 32 440 0 364 3 1 2 3 0 8 1 sysvmsgpl 40 13 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 181 0 171 1 0 1 1 0 8 0 shmpl 112 34 0 6 1 0 1 1 0 8 0 dirhash 1024 61 0 44 3 0 3 3 0 8 0 dino2pl 256 8068 0 6546 96 0 96 96 0 8 0 ffsino 296 8068 0 6546 119 1 118 118 0 8 0 nchpl 144 12788 0 11069 64 0 64 64 0 8 0 rtmask 32 45 0 45 6 5 1 1 0 8 1 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 48213 0 48213 5 4 1 2 0 8 1 percpumem 16 386 0 333 1 0 1 1 0 8 0 kstatmem 264 290 0 254 3 0 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 7 0 7 5 5 0 1 0 8 0 scxspl 216 90967 0 90967 12 11 1 8 1 8 1 plimitpl 152 903 0 882 1 0 1 1 0 8 0 sigapl 424 3699 0 3644 7 0 7 7 0 8 0 knotepl 120 834 0 0 25 0 25 25 0 8 0 kqueuepl 224 1408 0 1395 14 9 5 5 0 8 4 pipepl 344 633 0 603 11 3 8 9 0 8 5 fdescpl 528 3664 0 3632 3 0 3 3 0 8 0 filepl 160 29217 0 28977 39 22 17 18 0 8 4 lockfpl 104 1510 0 1506 2 1 1 2 0 8 0 lockfspl 48 559 0 556 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 447 0 430 1 0 1 1 0 8 0 ucredpl 104 4867 0 4852 1 0 1 1 0 8 0 zombiepl 144 3967 0 3965 2 1 1 1 0 8 0 processpl 1248 3699 0 3644 5 0 5 5 0 8 0 procpl 664 8757 0 8694 9 2 7 7 0 8 0 sosppl 168 20 0 20 4 4 0 1 0 8 0 sockpl 752 7622 0 7588 79 68 11 17 0 8 7 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 59 0 0 6 0 6 6 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 2555 0 0 158 0 158 158 0 8 0 bufpl 280 37042 0 30899 440 0 440 440 0 8 0 anonpl 32 15526 0 0 125 0 125 125 0 246 0 amapchunkpl 152 112517 0 111864 68 35 33 36 0 158 5 amappl16 200 14084 0 13465 105 72 33 33 0 8 0 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 154 0 141 1 0 1 1 0 8 0 amappl13 176 13 0 13 2 2 0 1 0 8 0 amappl12 168 4457 0 4424 4 2 2 3 0 8 0 amappl11 160 53 0 38 1 0 1 1 0 8 0 amappl10 152 29 0 29 1 1 0 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 142 0 129 1 0 1 1 0 8 0 amappl6 120 293 0 289 1 0 1 1 0 8 0 amappl5 112 156 0 146 1 0 1 1 0 8 0 amappl4 104 331 0 309 1 0 1 1 0 8 0 amappl3 96 22894 0 22776 6 2 4 4 0 8 0 amappl2 88 801 0 738 2 0 2 2 0 8 0 amappl1 80 22757 0 22137 16 2 14 15 0 8 0 amappl 88 30264 0 30083 6 1 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 9 0 9 3 3 0 1 0 8 0 dma128 128 255 0 255 3 3 0 1 0 8 0 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 36 0 6 1 0 1 1 0 8 0 uaddrrnd 24 3664 0 3632 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3664 0 3632 1 0 1 1 0 8 0 vmmpekpl 168 26234 0 26166 4 0 4 4 0 8 0 vmmpepl 168 234524 0 231824 166 48 118 118 0 357 0 vmsppl 488 3663 0 3632 6 1 5 5 0 8 0 rwobjpl 80 65003 0 57493 158 4 154 154 0 8 0 pdppl 4096 7336 0 7264 126 54 72 84 0 8 0 pvpl 32 24277 0 0 196 0 196 196 0 265 0 pmappl 256 3663 0 3632 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 527 0 130 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336edd9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833afff6,ffffffff833c2f1e,3b7,ffffffff833ed01e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a36f518,ffffffff8336a3ec) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80002a36f510) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a3d6d38) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c46bb90) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806ea0a950,1,fffffd80097fb3a8,ffff80002a3d6d38) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805b3f1328,ffff80002a3d6d38) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805b3f1328,ffff80002a3d6d38) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805b3f1328,ffff80002a3d6d38) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805b3f1328,ffff80002a3d6d38) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a3d6d38) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a3d6d38,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a3d6d38,ffff80003c46bf00,ffff80003c46be50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c46bf00) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c46bf00) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x739508c575b0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5