panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 113709 5892 32767 0x10 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8874) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f54db,ffffffff83447edc,4e2,ffffffff83447f11) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8009356058) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd807524b018,6c40d14d000,6c40d14e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd807524b018,fffffd806c8f1390,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd807524b018) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd807524b018) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffe7a10,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe7a10,ffff80002a352b80,ffff80002a352ad0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a352b80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a352b80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec24a848ac0, count: 4 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 "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8874) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f54db,ffffffff83447edc,4e2,ffffffff83447f11) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8009356058) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd807524b018,6c40d14d000,6c40d14e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd807524b018,fffffd806c8f1390,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd807524b018) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd807524b018) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffe7a10,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe7a10,ffff80002a352b80,ffff80002a352ad0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a352b80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a352b80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec24a848ac0, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a3527a0 rbx 0xffffffff83980e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000fffe7a10 rax 0xffffffff8397fff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x11d451b0dec35b6d r11 0x3e0256a47810279d r12 0xffffffff83980c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff812e3ea5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a352790 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=347026 pid=65089 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=67, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffe7a10 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffe6550,0xffffffff83b26360 process=0xffff80003c3cce90 user=0xffff80002a34d000, vmspace=0xfffffd807524b018 estcpu=17, cpticks=7, pctcpu=0.2, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 34616 436627 18716 32767 2 0x10 syz-executor 30205 351040 52248 32767 3 0x90 wait syz-executor 92256 461201 52835 32767 3 0x90 piperd syz-executor 5892 113709 393 32767 7 0x10 syz-executor 16329 131123 99027 32767 3 0x90 piperd syz-executor 45532 10932 87940 32767 3 0x90 piperd syz-executor 52248 50907 30487 0 3 0x82 wait syz-executor 52835 423116 30487 0 3 0x82 wait syz-executor 18716 61314 30487 0 3 0x82 wait syz-executor 393 330467 30487 0 3 0x82 wait syz-executor 87940 333196 30487 0 3 0x82 wait syz-executor 99027 22396 30487 0 3 0x82 wait syz-executor 90874 387669 30487 0 3 0x82 wait syz-executor 30487 360316 723 0 3 0x82 nanoslp syz-executor 723 221679 56470 0 3 0x10008a sigsusp ksh 56470 55699 7897 0 3 0x98 kqread sshd-session 7897 35990 86716 0 3 0x92 kqread sshd-session 94879 282988 1 0 3 0x100083 ttyin getty 86716 82895 1 0 3 0x88 kqread sshd 89941 196752 58266 73 3 0x1100090 kqread syslogd 58266 367752 1 0 3 0x100082 sbwait syslogd 33903 216867 1 0 3 0x100080 kqread resolvd 87069 37329 1041 77 3 0x100092 kqread dhcpleased 71530 354872 1041 77 3 0x100092 kqread dhcpleased 1041 423264 1 0 3 0x80 kqread dhcpleased 66215 63546 0 0 3 0x14200 bored smr 36252 268255 0 0 3 0x14200 pgzero zerothread 64759 422567 0 0 3 0x14200 aiodoned aiodoned 67634 388262 0 0 3 0x14200 syncer update 23435 34405 0 0 3 0x14200 cleaner cleaner 76662 32705 0 0 3 0x14200 reaper reaper 46099 420757 0 0 3 0x14200 pgdaemon pagedaemon 10605 182349 0 0 3 0x14200 bored viomb 31484 126722 0 0 3 0x40014200 acpi0 acpi0 670 461589 0 0 3 0x40014200 idle1 47564 133828 0 0 3 0x14200 bored softnet1 65070 136475 0 0 3 0x14200 bored softnet0 76541 318743 0 0 3 0x14200 bored systqmp 77769 458442 0 0 3 0x14200 bored systq 11077 95944 0 0 3 0x14200 tmoslp softclockmp 16592 385258 0 0 3 0x40014200 tmoslp softclock 89773 278218 0 0 3 0x40014200 idle0 1 454348 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 34616 (syz-executor) thread 0xffff8000fffe7248 (436627) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83ae0d00) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 biowait+0xc6 sys/kern/vfs_bio.c:1242 #4 bwrite+0x2e7 sys/kern/vfs_bio.c:754 #5 VOP_BWRITE+0x60 sys/kern/vfs_vops.c:651 #6 ufs_mkdir+0x547 sys/ufs/ufs/ufs_vnops.c:1160 #7 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #8 domkdirat+0x179 sys/kern/vfs_syscalls.c:3149 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806059d318) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3149 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d340678) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3134 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12017K 12034K 166960K 12150 0 pcb 17 12K 12K 166960K 17 0 rtable 217 6K 7K 166960K 426 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 41 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 41 0 iov 0 0K 16K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1581 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 1K 1K 166960K 21 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 129K 166960K 425 0 sigio 0 0K 0K 166960K 4 0 proc 58 99K 163K 166960K 527 0 subproc 63 3K 4K 166960K 162 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 40 0 in_multi 88 6K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 401 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 191 143K 186K 166960K 5330 0 UVM aobj 13 2K 2K 166960K 13 0 pinsyscall 38 76K 116K 166960K 1565 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 14 0 NDP 10 0K 2K 166960K 27 0 temp 40 9116K 9132K 166960K 4510 0 kqueue 13 20K 29K 166960K 71 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 47 0 44 1 0 1 1 0 8 0 rtentry 176 112 0 12 6 0 6 6 0 8 0 unpcb 144 379 0 364 6 1 5 6 0 8 4 syncache 336 9 0 9 1 0 1 1 0 8 1 tcpcb 736 97 0 93 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 392 0 385 7 0 7 7 0 8 6 nd6 152 25 0 3 1 0 1 1 0 8 0 kcovpl 48 18 0 11 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 454 0 44 29 0 29 29 0 8 1 art_table 40 455 0 44 5 0 5 5 0 8 0 art_node 32 112 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 5 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 72 19 0 9 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2059 0 583 93 0 93 93 0 8 0 ffsino 296 2059 0 583 114 0 114 114 0 8 0 nchpl 144 2601 0 902 64 0 64 64 0 8 0 vnodes 216 2230 0 0 124 0 124 124 0 8 0 namei 1024 8380 0 8380 2 1 1 2 0 8 1 percpumem 16 50 0 1 1 0 1 1 0 8 0 kstatmem 264 25 0 2 2 0 2 2 0 8 0 scxspl 216 8078 0 8078 4 3 1 3 1 8 1 plimitpl 152 158 0 135 2 0 2 2 0 8 1 sigapl 424 712 0 666 7 0 7 7 0 8 1 knotepl 120 301 0 0 10 0 10 10 0 8 0 kqueuepl 224 110 0 101 2 0 2 2 0 8 1 pipepl 344 217 0 190 6 0 6 6 0 8 3 fdescpl 528 696 0 667 4 1 3 4 0 8 0 filepl 160 3784 0 3592 18 1 17 18 0 8 7 lockfpl 104 135 0 133 1 0 1 1 0 8 0 lockfspl 48 39 0 37 1 0 1 1 0 8 0 sessionpl 144 82 0 67 1 0 1 1 0 8 0 pgrppl 48 102 0 80 1 0 1 1 0 8 0 ucredpl 104 794 0 776 1 0 1 1 0 8 0 zombiepl 144 669 0 666 1 0 1 1 0 8 0 processpl 1232 712 0 666 5 0 5 5 0 8 0 procpl 664 1125 0 1079 6 0 6 6 0 8 1 sosppl 176 2 0 2 1 1 0 1 0 8 0 sockpl 752 825 0 800 23 13 10 23 0 8 7 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 285 0 0 18 0 18 18 0 8 0 bufpl 280 5088 0 102 357 0 357 357 0 8 0 anonpl 32 9615 0 0 78 0 78 78 0 246 0 amapchunkpl 152 16740 0 16093 30 0 30 30 0 158 2 amappl16 200 2294 0 2272 17 7 10 14 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 430 0 429 1 0 1 1 0 8 0 amappl13 176 125 0 115 1 0 1 1 0 8 0 amappl12 168 943 0 914 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 59 0 49 1 0 1 1 0 8 0 amappl9 144 292 0 291 1 0 1 1 0 8 0 amappl8 136 97 0 96 1 0 1 1 0 8 0 amappl7 128 146 0 135 1 0 1 1 0 8 0 amappl6 120 153 0 152 1 0 1 1 0 8 0 amappl5 112 106 0 98 1 0 1 1 0 8 0 amappl4 104 351 0 334 1 0 1 1 0 8 0 amappl3 96 3073 0 2978 5 1 4 4 0 8 0 amappl2 88 760 0 704 2 0 2 2 0 8 0 amappl1 80 12879 0 12332 16 0 16 16 0 8 3 amappl 88 4550 0 4419 5 0 5 5 0 92 0 uvmvnodes 80 109 0 0 3 0 3 3 0 8 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 12 0 0 1 0 1 1 0 8 0 uaddrrnd 24 696 0 666 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 696 0 666 1 0 1 1 0 8 0 vmmpekpl 168 8305 0 8261 3 0 3 3 0 8 0 vmmpepl 168 55263 0 53562 105 0 105 105 0 357 17 vmsppl 488 695 0 666 7 2 5 6 0 8 0 rwobjpl 80 18812 0 17913 26 0 26 26 0 8 3 pdppl 4096 1399 0 1332 113 34 79 99 0 8 12 pvpl 32 27744 0 0 225 1 224 224 0 265 0 pmappl 256 695 0 666 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 290 0 38 8 0 8 8 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(ffffffff834b8874) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f54db,ffffffff83447edc,4e2,ffffffff83447f11) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8009356058) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd807524b018,6c40d14d000,6c40d14e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd807524b018,fffffd806c8f1390,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd807524b018) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd807524b018) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffe7a10,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe7a10,ffff80002a352b80,ffff80002a352ad0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a352b80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a352b80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec24a848ac0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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 __mp_lock(ffffffff83ae0500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ae0500) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff800034782130) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800034782130) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec24a848ac0, count: 9 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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 __mp_lock(ffffffff83ae0500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ae0500) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff800034782130) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800034782130) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec24a848ac0, count: -6