panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1250 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 327881 39874 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344e3c9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d929,ffffffff8347c156,4e2,ffffffff833de929) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80094ca570) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806be2d3e8,e1b5474f000,e1b54750000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806be2d3e8,fffffd806ad37228,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003afdca80,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003afdca80,ffff80003c3e3590,ffff80003c3e34e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3e3590) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e3590) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x784397c6e0c0, 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/multicore/kernel/sys/uvm/uvm_page.c", line 1250 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344e3c9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d929,ffffffff8347c156,4e2,ffffffff833de929) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80094ca570) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806be2d3e8,e1b5474f000,e1b54750000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806be2d3e8,fffffd806ad37228,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003afdca80,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003afdca80,ffff80003c3e3590,ffff80003c3e34e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3e3590) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e3590) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x784397c6e0c0, count: -11 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3e31b0 rbx 0xffff8000299bee07 rdx 0 rcx 0xffff80003afdca80 rax 0xffff8000299bdff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x72aaca9cf9cebdbe r11 0xf819d900f00ba5e0 r12 0xffff8000299bec08 r13 0 r14 0 r15 0x1 rip 0xffffffff82669d45 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3e31a0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=321672 pid=19818 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=74, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003afdca80 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003afdcd18,0xffff80003afdc7f8 process=0xffff80003c3fb040 user=0xffff80003c3de000, vmspace=0xfffffd806be2d3e8 estcpu=24, cpticks=3, pctcpu=0.1, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39874 327881 16090 0 7 0 syz-executor 39874 221541 16090 0 2 0x4000000 syz-executor 68212 368059 48249 0 2 0 syz-executor 68212 62946 48249 0 3 0x4000080 fsleep syz-executor 68212 111950 48249 0 3 0x4000080 fsleep syz-executor 83584 5726 84833 -1 2 0x10 syz-executor 83584 149303 84833 -1 3 0x4000090 fsleep syz-executor 97032 42201 10180 0 2 0 syz-executor 97032 123879 10180 0 3 0x4000080 fsleep syz-executor 97032 216292 10180 0 3 0x4000080 fsleep syz-executor 97032 428034 10180 0 3 0x4000080 fsleep syz-executor 56255 366006 24517 0 2 0 syz-executor 56255 70223 24517 0 3 0x4000080 fsleep syz-executor 56255 70347 24517 0 3 0x4000080 fsleep syz-executor 56255 427822 24517 0 3 0x4000080 fsleep syz-executor 95858 508269 8701 0 3 0x100082 sbwait arp 8701 397572 72203 0 3 0x10008a sigsusp sh 10180 472479 51029 0 2 0xc82 syz-executor 84833 452431 51029 0 2 0xc82 syz-executor 48249 405798 51029 0 2 0xc82 syz-executor 16090 84436 51029 0 2 0xc82 syz-executor 72203 337929 51029 0 3 0x82 wait syz-executor 24517 135813 51029 0 2 0xc82 syz-executor 7280 156921 51029 0 2 0xc82 syz-executor 8793 496547 51029 0 2 0xc82 syz-executor 51029 123057 94919 0 3 0x82 kqread syz-executor 94919 183226 76552 0 3 0x10008a sigsusp ksh 76552 33535 60857 0 3 0x98 kqread sshd-session 60857 178553 74262 0 3 0x92 kqread sshd-session 31216 203574 1 0 3 0x100083 ttyin getty 74262 213764 1 0 3 0x88 kqread sshd 22665 363728 19635 74 3 0x1100092 bpf pflogd 19635 363649 1 0 3 0x80 sbwait pflogd 24952 295183 70062 73 3 0x1100090 kqread syslogd 70062 203835 1 0 3 0x100082 sbwait syslogd 16603 404826 1 0 3 0x100080 kqread resolvd 2144 326210 61718 77 3 0x100092 kqread dhcpleased 88304 504987 61718 77 3 0x100092 kqread dhcpleased 61718 57514 1 0 3 0x80 kqread dhcpleased 5440 267315 0 0 3 0x14200 bored smr 71925 74077 0 0 2 0x14200 zerothread 9981 16262 0 0 3 0x14200 aiodoned aiodoned 81873 417642 0 0 3 0x14200 syncer update 17836 343832 0 0 3 0x14200 cleaner cleaner 24774 503994 0 0 3 0x14200 reaper reaper 29103 503687 0 0 3 0x14200 pgdaemon pagedaemon 10351 479676 0 0 3 0x14200 bored viomb 42932 284428 0 0 3 0x40014200 acpi0 acpi0 9484 381933 0 0 3 0x40014200 idle1 63289 219625 0 0 3 0x14200 bored softnet1 39500 394530 0 0 3 0x14200 bored softnet0 50669 444859 0 0 3 0x14200 bored systqmp 316 427921 0 0 3 0x14200 bored systq 49560 384634 0 0 3 0x14200 tmoslp softclockmp 64426 68512 0 0 3 0x40014200 tmoslp softclock 94017 123877 0 0 3 0x40014200 idle0 1 266380 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11075 12199K 12243K 166960K 12217 0 pcb 17 14K 16K 166960K 103 0 rtable 225 7K 7K 166960K 334 0 pf 38 17K 18K 166960K 53 0 ifaddr 42 7K 7K 166960K 46 0 ifgroup 57 2K 2K 166960K 61 0 sysctl 1 1K 9K 166960K 5 0 counters 72 37K 37K 166960K 82 0 ioctlops 0 0K 4K 166960K 1498 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1300 82K 82K 166960K 1467 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 176 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 180K 166960K 547 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 2 0 in_multi 89 6K 6K 166960K 91 0 ether_multi 1 0K 0K 166960K 1 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 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 376 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 254 163K 172K 166960K 3508 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 44 88K 107K 166960K 1304 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 13 0K 1K 166960K 29 0 temp 36 9070K 9134K 166960K 5301 0 kqueue 13 20K 28K 166960K 34 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 38 0 34 1 0 1 1 0 8 0 rtentry 176 103 0 1 5 0 5 5 0 8 0 unpcb 144 49 0 32 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 23 0 16 1 0 1 1 0 8 0 arp 136 17 0 0 1 0 1 1 0 8 0 inpcb 328 163 0 152 7 0 7 7 0 8 6 nd6 152 21 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 6 0 5 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 17 0 0 1 0 1 1 0 8 0 pfstkey 128 17 0 0 1 0 1 1 0 8 0 pfstate 448 17 0 0 2 0 2 2 0 8 0 pfrule 1360 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 256 412 0 0 26 0 26 26 0 8 0 art_table 40 413 0 0 5 0 5 5 0 8 0 art_node 32 103 0 10 1 0 1 1 0 8 0 semapl 112 1 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1722 0 251 93 0 93 93 0 8 0 ffsino 296 1722 0 251 114 0 114 114 0 8 0 nchpl 144 1975 0 273 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 1831 0 0 102 0 102 102 0 8 0 namei 1024 6185 0 6185 1 0 1 1 0 8 1 percpumem 16 56 0 5 1 0 1 1 0 8 0 kstatmem 264 32 0 4 3 0 3 3 0 8 0 scxspl 216 6319 0 6319 4 1 3 3 1 8 3 plimitpl 152 32 0 14 1 0 1 1 0 8 0 sigapl 424 488 0 439 7 0 7 7 0 8 1 knotepl 120 336 0 0 11 0 11 11 0 8 0 kqueuepl 224 35 0 26 1 0 1 1 0 8 0 pipepl 344 125 0 98 3 0 3 3 0 8 0 fdescpl 528 472 0 440 3 0 3 3 0 8 0 filepl 160 2040 0 1815 13 0 13 13 0 8 1 lockfpl 104 35 0 32 1 0 1 1 0 8 0 lockfspl 48 16 0 13 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 316 0 302 1 0 1 1 0 8 0 zombiepl 144 441 0 439 1 0 1 1 0 8 0 processpl 1232 488 0 439 5 0 5 5 0 8 0 procpl 664 579 0 520 6 0 6 6 0 8 0 sockpl 752 250 0 218 10 0 10 10 0 8 6 mcl64k 65536 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 24 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 171 0 0 11 0 11 11 0 8 0 bufpl 280 4869 0 105 341 0 341 341 0 8 0 anonpl 32 8248 0 0 67 0 67 67 0 246 0 amapchunkpl 152 10234 0 9442 31 0 31 31 0 158 0 amappl16 200 1818 0 1795 5 1 4 5 0 8 2 amappl15 192 21 0 21 1 1 0 1 0 8 0 amappl14 184 425 0 423 1 0 1 1 0 8 0 amappl13 176 115 0 101 1 0 1 1 0 8 0 amappl12 168 715 0 683 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 68 0 54 1 0 1 1 0 8 0 amappl9 144 289 0 289 1 1 0 1 0 8 0 amappl8 136 101 0 99 1 0 1 1 0 8 0 amappl7 128 155 0 141 1 0 1 1 0 8 0 amappl6 120 158 0 156 1 0 1 1 0 8 0 amappl5 112 93 0 83 1 0 1 1 0 8 0 amappl4 104 285 0 266 1 0 1 1 0 8 0 amappl3 96 1717 0 1592 4 0 4 4 0 8 0 amappl2 88 518 0 456 2 0 2 2 0 8 0 amappl1 80 9399 0 8763 15 0 15 15 0 8 0 amappl 88 2789 0 2610 5 0 5 5 0 92 0 uvmvnodes 80 101 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 472 0 439 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 472 0 439 1 0 1 1 0 8 0 vmmpekpl 168 5675 0 5647 2 0 2 2 0 8 0 vmmpepl 168 38087 0 36099 87 0 87 87 0 357 0 vmsppl 488 471 0 439 5 0 5 5 0 8 0 rwobjpl 80 13943 0 12854 24 0 24 24 0 8 1 pdppl 4096 951 0 878 95 22 73 83 0 8 0 pvpl 32 28494 0 0 231 1 230 230 0 265 0 pmappl 256 471 0 439 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 263 0 25 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838e0ff0) 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: 0x6f9478626360, count: 12 ddb{0}> trace x86_ipi_db(ffffffff838e0ff0) 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: 0x6f9478626360, 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(ffffffff8344e3c9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d929,ffffffff8347c156,4e2,ffffffff833de929) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80094ca570) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806be2d3e8,e1b5474f000,e1b54750000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806be2d3e8,fffffd806ad37228,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003afdca80,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003afdca80,ffff80003c3e3590,ffff80003c3e34e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3e3590) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e3590) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x784397c6e0c0, count: 4 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344e3c9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d929,ffffffff8347c156,4e2,ffffffff833de929) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80094ca570) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806be2d3e8,e1b5474f000,e1b54750000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806be2d3e8,fffffd806ad37228,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806be2d3e8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003afdca80,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003afdca80,ffff80003c3e3590,ffff80003c3e34e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3e3590) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e3590) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x784397c6e0c0, count: -11