panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1207 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 143148 79946 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c01c6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83501a7f,ffffffff834560a7,4b7,ffffffff834560dc) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff6800947d4a8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff6800c957d80,eb27f34f000,eb27f74e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff6800c957d80,fffff6806cf7cb88,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003bbc54e8,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260 sys_exit(ffff80003bbc54e8,ffff80002a30ac90,ffff80002a30abe0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a30ac90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a30ac90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bb7dd7292c0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1207 ddb{1}> show kasan No such command ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c01c6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83501a7f,ffffffff834560a7,4b7,ffffffff834560dc) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff6800947d4a8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff6800c957d80,eb27f34f000,eb27f74e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff6800c957d80,fffff6806cf7cb88,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003bbc54e8,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260 sys_exit(ffff80003bbc54e8,ffff80002a30ac90,ffff80002a30abe0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a30ac90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a30ac90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bb7dd7292c0, count: -11 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a30a8b0 rbx 0xffff80002999ee0f rdx 0 rcx 0xffff80003bbc54e8 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xf7ddb9d60883f509 r11 0x322add5b95ef8bbf r12 0xffff80002999ec10 r13 0 r14 0 r15 0x1 rip 0xffffffff81f2e755 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a30a8a0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=10830 pid=25687 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=77, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003bbc54e8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003bbc5a18,0xffff80002a22aa88 process=0xffff800045fef9d8 user=0xffff80002a305000, vmspace=0xfffff6800c957d80 estcpu=27, cpticks=3, pctcpu=0.1, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 7095 160043 30423 0 2 0 0 syz-executor 79946 143148 45990 32767 7 0x10 0 syz-executor 79946 416644 45990 32767 2 0x10 0x4000000 syz-executor 94545 154280 87400 32767 2 0x10 0 syz-executor 97396 100809 63357 32767 2 0x10 0 syz-executor 97396 297108 63357 32767 2 0x10 0x4000000 syz-executor 30423 374200 94811 0 3 0x2 0x80 wait syz-executor 49318 497852 33585 0 3 0x2 0 clonelk ifconfig 33585 450447 87595 0 3 0x100002 0x88 sigsusp sh 87595 300509 80037 0 3 0 0x80 wait syz-executor 80037 469211 94811 0 3 0x2 0x80 wait syz-executor 56468 54462 94811 0 3 0x2 0x80 wait syz-executor 87400 465417 98222 32767 2 0x10 0xc80 syz-executor 98222 392399 94811 0 3 0x2 0x80 wait syz-executor 45990 205116 14976 32767 2 0x10 0xc80 syz-executor 14976 149830 94811 0 3 0x2 0x80 wait syz-executor 32281 291795 93714 32767 2 0x10 0xc80 syz-executor 93714 384928 94811 0 3 0x2 0x80 wait syz-executor 63357 48407 78259 32767 2 0x10 0xc80 syz-executor 78259 289793 94811 0 3 0x2 0x80 wait syz-executor 90788 434690 25834 0 3 0x100002 0x80 sbwait arp 25834 271995 61798 0 3 0x100002 0x88 sigsusp sh 61798 356161 16464 0 3 0 0x80 wait syz-executor 16464 70707 94811 0 3 0x2 0x80 wait syz-executor 94811 74361 61590 0 3 0x2 0x80 kqread syz-executor 61590 485848 16045 0 3 0x100002 0x88 sigsusp ksh 16045 58758 48341 0 3 0x10 0x88 kqread sshd-session 48341 505142 9481 0 3 0x12 0x80 kqread sshd-session 13042 438404 1 0 3 0x100003 0x80 ttyin getty 9481 49887 1 0 3 0 0x88 kqread sshd 58305 418665 46628 73 2 0x1100010 0x80 syslogd 46628 125197 1 0 3 0x100002 0x80 sbwait syslogd 64179 251125 1 0 3 0x100000 0x80 kqread resolvd 41059 385257 198 77 3 0x100012 0x80 kqread dhcpleased 95980 35793 198 77 3 0x100012 0x80 kqread dhcpleased 198 196673 1 0 3 0 0x80 kqread dhcpleased 24222 104043 0 0 3 0x14000 0x200 bored smr 28636 268538 0 0 2 0x14000 0x200 zerothread 32413 87689 0 0 3 0x14000 0x200 aiodoned aiodoned 81332 447113 0 0 2 0x14000 0xe00 update 72851 16847 0 0 3 0x14000 0x200 cleaner cleaner 62642 342314 0 0 3 0x14000 0x200 reaper reaper 78804 338185 0 0 3 0x14000 0x200 pgdaemon pagedaemon 59098 279711 0 0 3 0x14000 0x200 bored viomb 76780 414731 0 0 3 0x14000 0x40000200 acpi0 acpi0 9930 49410 0 0 3 0x14000 0x40000200 idle1 18801 314477 0 0 3 0x14000 0x200 bored softnet1 59039 152328 0 0 2 0x14000 0x200 softnet0 62557 39477 0 0 3 0x14000 0x200 bored systqmp 93380 460430 0 0 3 0x14000 0x200 bored systq 34079 53892 0 0 3 0x14000 0x200 tmoslp softclockmp 90034 233778 0 0 3 0x14000 0x40000200 tmoslp softclock 36763 231829 0 0 3 0x14000 0x40000200 idle0 1 74668 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11046 12014K 12034K 166960K 12209 0 pcb 17 12K 12K 166960K 17 0 rtable 177 5K 6K 166960K 1006 0 pf 27 16K 16K 166960K 75 0 ifaddr 32 5K 7K 166960K 134 0 ifgroup 42 1K 2K 166960K 138 0 sysctl 2 1K 9K 166960K 7 0 counters 66 36K 37K 166960K 114 0 ioctlops 0 0K 4K 166960K 167 0 iov 0 0K 20K 166960K 14 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1595 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 19 2K 2K 166960K 20 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 25 93K 121K 166960K 822 0 sigio 0 0K 0K 166960K 12 0 proc 65 115K 147K 166960K 1147 0 subproc 72 4K 4K 166960K 288 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 187 0 in_multi 67 4K 6K 166960K 334 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 11 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 681 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 227 164K 193K 166960K 7890 0 UVM aobj 17 2K 2K 166960K 18 0 pinsyscall 47 94K 114K 166960K 2519 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 27 0 NDP 9 0K 1K 166960K 91 0 temp 43 9120K 9179K 166960K 7504 0 kqueue 13 20K 27K 166960K 97 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 102 0 98 1 0 1 1 0 8 0 rtentry 176 348 0 268 5 0 5 5 0 8 0 unpcb 144 239 0 224 4 0 4 4 0 8 3 syncache 336 17 0 17 1 0 1 1 0 8 1 tcpcb 736 421 0 417 7 0 7 7 0 8 6 arp 136 61 0 48 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 328 888 0 880 10 1 9 10 0 8 8 ip6q 80 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 152 90 0 75 1 0 1 1 0 8 0 kcovpl 48 32 0 24 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1412 0 1082 31 0 31 31 0 8 4 art_table 40 1413 0 1082 5 0 5 5 0 8 0 art_node 32 348 0 275 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 8 1 0 1 1 0 8 0 semupl 112 4 0 4 1 0 1 1 0 8 1 semapl 72 18 0 1 1 0 1 1 0 8 0 shmpl 112 15 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2054 0 538 95 0 95 95 0 8 0 ffsino 296 2054 0 538 117 0 117 117 0 8 0 nchpl 144 2702 0 945 66 0 66 66 0 8 0 vnodes 216 2351 0 0 131 0 131 131 0 8 0 namei 1024 11581 0 11581 4 2 2 3 0 8 2 percpumem 16 73 0 24 1 0 1 1 0 8 0 kstatmem 264 69 0 48 2 0 2 2 0 8 0 scxspl 216 9329 0 9329 4 3 1 3 1 8 1 plimitpl 152 194 0 170 2 0 2 2 0 8 0 sigapl 424 1078 0 1024 7 0 7 7 0 8 0 knotepl 120 313 0 0 10 0 10 10 0 8 0 kqueuepl 224 118 0 109 1 0 1 1 0 8 0 pipepl 344 230 0 203 4 0 4 4 0 8 0 fdescpl 528 1062 0 1025 3 0 3 3 0 8 0 filepl 160 4407 0 4204 14 0 14 14 0 8 2 lockfpl 104 85 0 83 1 0 1 1 0 8 0 lockfspl 48 40 0 38 1 0 1 1 0 8 0 sessionpl 144 61 0 46 1 0 1 1 0 8 0 pgrppl 48 96 0 73 1 0 1 1 0 8 0 ucredpl 104 608 0 592 1 0 1 1 0 8 0 zombiepl 144 1026 0 1024 1 0 1 1 0 8 0 processpl 1232 1078 0 1024 5 0 5 5 0 8 0 procpl 664 1648 0 1592 7 0 7 7 0 8 1 sosppl 176 9 0 9 1 0 1 1 0 8 1 sockpl 752 1235 0 1208 17 4 13 14 0 8 10 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mextrefs 64 28 0 0 1 0 1 1 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1206 0 0 76 0 76 76 0 8 0 bufpl 272 5393 0 103 353 0 353 353 0 8 0 anonpl 32 8495 0 0 69 0 69 69 0 247 0 amapchunkpl 152 23808 0 23087 34 0 34 34 0 158 4 amappl16 200 2335 0 2320 5 1 4 5 0 8 2 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 672 0 669 1 0 1 1 0 8 0 amappl13 176 173 0 162 1 0 1 1 0 8 0 amappl12 168 1385 0 1353 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 110 0 100 1 0 1 1 0 8 0 amappl9 144 264 0 264 1 1 0 1 0 8 0 amappl8 136 198 0 196 1 0 1 1 0 8 0 amappl7 128 188 0 176 1 0 1 1 0 8 0 amappl6 120 375 0 371 1 0 1 1 0 8 0 amappl5 112 109 0 101 1 0 1 1 0 8 0 amappl4 104 351 0 334 1 0 1 1 0 8 0 amappl3 96 4203 0 4112 4 1 3 3 0 8 0 amappl2 88 1143 0 1063 3 0 3 3 0 8 0 amappl1 80 15936 0 15336 16 0 16 16 0 8 0 amappl 88 6739 0 6583 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 17 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1062 0 1024 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1062 0 1024 1 0 1 1 0 8 0 vmmpekpl 168 10309 0 10250 4 0 4 4 0 8 0 vmmpepl 168 77421 0 75410 104 0 104 104 0 357 10 vmsppl 488 1061 0 1024 7 1 6 6 0 8 0 rwobjpl 80 24247 0 23238 25 0 25 25 0 8 0 pdppl 4096 2131 0 2048 133 48 85 97 0 8 2 pvpl 32 30330 0 0 245 0 245 245 0 265 0 pmappl 256 1061 0 1024 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 734 0 53 20 0 20 20 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff839a3ff0) 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 end of kernel end trace frame: 0x74fd7b6cb360, count: 12 ddb{0}> trace x86_ipi_db(ffffffff839a3ff0) 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 end of kernel end trace frame: 0x74fd7b6cb360, count: -3 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c01c6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83501a7f,ffffffff834560a7,4b7,ffffffff834560dc) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff6800947d4a8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff6800c957d80,eb27f34f000,eb27f74e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff6800c957d80,fffff6806cf7cb88,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003bbc54e8,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260 sys_exit(ffff80003bbc54e8,ffff80002a30ac90,ffff80002a30abe0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a30ac90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a30ac90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bb7dd7292c0, count: 4 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c01c6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83501a7f,ffffffff834560a7,4b7,ffffffff834560dc) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff6800947d4a8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff6800c957d80,eb27f34f000,eb27f74e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff6800c957d80,fffff6806cf7cb88,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff6800c957d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003bbc54e8,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260 sys_exit(ffff80003bbc54e8,ffff80002a30ac90,ffff80002a30abe0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a30ac90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a30ac90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bb7dd7292c0, count: -11