panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1250 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(ffffffff834198e4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8345603f,ffffffff834400cb,4e2,ffffffff833aebd6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075a8b00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cb175d0,99d7bd0000,99d7bd1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cb175d0,fffffd806cad0bf8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000318be7f8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff8000318be7f8,ffff80003c911ca0,ffff80003c911bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c911ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c911ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7048fe7ef590, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1250 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834198e4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8345603f,ffffffff834400cb,4e2,ffffffff833aebd6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075a8b00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cb175d0,99d7bd0000,99d7bd1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cb175d0,fffffd806cad0bf8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000318be7f8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff8000318be7f8,ffff80003c911ca0,ffff80003c911bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c911ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c911ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7048fe7ef590, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003c9118e0 rbx 0xffff8000ffff5b20 rdx 0 rcx 0 rax 0xffff8000318be7f8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x19a8f0554fdfe55c r11 0x9e94a8fcc452791e r12 0 r13 0xffffffff83615940 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff822b2895 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c9118d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=408520 pid=90509 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000318be7f8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000318befc0,0xffff8000318c0558 process=0xffff8000ffff5b20 user=0xffff80003c90c000, vmspace=0xfffffd806cb175d0 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 43817 412127 18485 0 2 0 syz-executor 43817 29096 18485 0 2 0x4000000 syz-executor 84649 181604 81043 0 2 0 syz-executor 84649 474780 81043 0 3 0x4000080 kqsel syz-executor 84649 240061 81043 0 3 0x4000080 fsleep syz-executor 84649 476021 81043 0 3 0x4000080 fsleep syz-executor 86827 189314 0 0 3 0x14280 nfsidl nfsio 97610 210743 0 0 3 0x14280 nfsidl nfsio 71594 44201 0 0 3 0x14280 nfsidl nfsio 68567 450447 0 0 3 0x14280 nfsidl nfsio 43352 150593 0 0 3 0x14280 nfsidl nfsio 59046 59766 0 0 3 0x14280 nfsidl nfsio 52414 494693 0 0 3 0x14280 nfsidl nfsio 627 516370 0 0 3 0x14280 nfsidl nfsio 74894 169613 0 0 3 0x14280 nfsidl nfsio 1470 156937 0 0 3 0x14280 nfsidl nfsio 49944 480889 0 0 3 0x14280 nfsidl nfsio 83423 291371 0 0 3 0x14280 nfsidl nfsio 36078 271560 0 0 3 0x14280 nfsidl nfsio 69249 59277 0 0 3 0x14280 nfsidl nfsio 90575 141919 0 0 3 0x14280 nfsidl nfsio 46125 373589 0 0 3 0x14280 nfsidl nfsio 51804 382408 0 0 3 0x14280 nfsidl nfsio 10514 32858 0 0 3 0x14280 nfsidl nfsio 75098 66869 0 0 3 0x14280 nfsidl nfsio 91585 324165 0 0 3 0x14280 nfsidl nfsio 61564 434200 84612 0 2 0 syz-executor 61564 338662 84612 0 3 0x4000080 fsleep syz-executor 61564 225720 84612 0 2 0x4000000 syz-executor 61564 407313 84612 0 3 0x4000080 fsleep syz-executor 61564 106381 84612 0 3 0x4000080 fsleep syz-executor 89905 423142 23975 0 3 0x80 nanoslp syz-executor 89905 405239 23975 0 3 0x4000080 pipewr syz-executor 89905 186941 23975 0 3 0x4000080 pipewr syz-executor 94364 273130 1 0 3 0x82 nanoslp getty 15024 451960 7563 0 2 0x2 syz-executor 18485 362775 7563 0 2 0xc82 syz-executor 81043 503303 7563 0 3 0x82 nanoslp syz-executor 88092 331151 7563 0 3 0x82 nanoslp syz-executor 84612 425845 7563 0 3 0x82 nanoslp syz-executor 77396 271114 7563 0 2 0x2 syz-executor 22241 348159 7563 0 3 0x82 nanoslp syz-executor 23975 126068 7563 0 3 0x82 nanoslp syz-executor 7563 148324 94697 0 3 0x82 kqread syz-executor 94697 511437 18545 0 3 0x10008a sigsusp ksh 18545 50385 73002 0 3 0x98 kqread sshd-session 73002 135687 33329 0 3 0x92 kqread sshd-session 33329 508742 1 0 3 0x88 kqread sshd 24771 267989 43038 73 2 0x1100090 syslogd 43038 498197 1 0 3 0x100082 sbwait syslogd 57903 363312 1 0 3 0x100080 kqread resolvd 18446 487575 43043 77 3 0x100092 kqread dhcpleased 39584 105947 43043 77 3 0x100092 kqread dhcpleased 43043 336200 1 0 3 0x80 kqread dhcpleased 27727 222014 0 0 3 0x14200 bored smr 61962 302617 0 0 2 0x14200 zerothread 80798 33619 0 0 3 0x14200 aiodoned aiodoned 36910 398667 0 0 3 0x14200 syncer update 86909 318494 0 0 3 0x14200 cleaner cleaner 48802 443386 0 0 3 0x14200 reaper reaper 96298 253204 0 0 3 0x14200 pgdaemon pagedaemon 23598 224518 0 0 3 0x14200 bored viomb 72311 278763 0 0 3 0x40014200 acpi0 acpi0 86605 84536 0 0 3 0x14200 bored softnet0 67608 147350 0 0 3 0x14200 smrbar systqmp 85265 507700 0 0 3 0x14200 bored systq 71292 187393 0 0 3 0x40014200 tmoslp softclock 98844 124074 0 0 3 0x40014200 idle0 1 142433 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11033 12117K 12380K 166960K 12278 0 pcb 18 13K 14K 166960K 77 0 rtable 213 6K 7K 166960K 400 0 pf 28 12K 13K 166960K 39 0 ifaddr 38 6K 7K 166960K 49 0 ifgroup 46 2K 2K 166960K 61 0 sysctl 4 1K 9K 166960K 8 0 counters 32 17K 18K 166960K 38 0 ioctlops 0 0K 4K 166960K 40 0 iov 0 0K 12K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1289 81K 82K 166960K 1415 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 93K 166960K 216 0 sigio 0 0K 0K 166960K 1 0 proc 60 59K 100K 166960K 515 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 11 0 in_multi 88 6K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 368 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 216 161K 178K 166960K 3704 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 36 72K 94K 166960K 1321 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 10 0K 2K 166960K 31 0 temp 42 9063K 9127K 166960K 4302 0 kqueue 13 20K 26K 166960K 39 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 44 0 41 1 0 1 1 0 8 0 rtentry 136 115 0 24 4 0 4 4 0 8 0 unpcb 144 121 0 106 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 95 0 90 1 0 1 1 0 8 0 arp 96 18 0 2 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 3 0 2 1 0 1 1 0 8 0 inpcb 328 219 0 210 4 0 4 4 0 8 2 nd6 112 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 4 0 4 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 515 0 41 31 0 31 31 0 8 1 art_table 40 517 0 41 5 0 5 5 0 8 0 art_node 32 114 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0 semapl 112 3 0 1 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1711 0 253 92 0 92 92 0 8 0 ffsino 256 1711 0 253 92 0 92 92 0 8 0 nchpl 144 2023 0 328 64 0 64 64 0 8 0 vnodes 216 1826 0 0 102 0 102 102 0 8 0 namei 1024 6178 0 6178 2 0 2 2 0 8 2 kstatmem 264 30 0 10 2 0 2 2 0 8 0 scxspl 216 7305 0 7305 8 0 8 8 1 8 8 plimitpl 152 83 0 65 1 0 1 1 0 8 0 sigapl 424 532 0 471 8 0 8 8 0 8 0 knotepl 120 5173 0 5126 2 0 2 2 0 8 0 kqueuepl 184 40 0 30 1 0 1 1 0 8 0 pipepl 304 127 0 97 3 0 3 3 0 8 0 fdescpl 448 499 0 472 5 0 5 5 0 8 0 filepl 120 2172 0 1893 12 0 12 12 0 8 3 lockfpl 104 34 0 32 1 0 1 1 0 8 0 lockfspl 48 17 0 15 1 0 1 1 0 8 0 sessionpl 144 24 0 17 1 0 1 1 0 8 0 pgrppl 48 33 0 18 1 0 1 1 0 8 0 ucredpl 104 184 0 172 1 0 1 1 0 8 0 zombiepl 144 473 0 471 1 0 1 1 0 8 0 processpl 1152 532 0 471 5 0 5 5 0 8 0 procpl 664 654 0 583 7 0 7 7 0 8 0 sockpl 552 391 0 364 8 0 8 8 0 8 5 mcl64k 65536 9 0 9 1 0 1 1 0 8 1 mcl8k 8192 5 0 5 1 0 1 1 0 8 1 mcl4k 4096 2592 0 2538 14 0 14 14 0 8 6 mcl2k 2048 211 0 209 2 0 2 2 0 8 1 mtagpl 96 7 0 4 1 0 1 1 0 8 0 mbufpl 256 5151 0 4989 16 0 16 16 0 8 5 bufpl 280 4809 0 102 337 0 337 337 0 8 0 anonpl 24 105459 0 96733 55 0 55 55 0 187 0 amapchunkpl 152 11396 0 10691 29 0 29 29 0 158 0 amappl16 200 1754 0 1675 5 0 5 5 0 8 0 amappl15 192 4 0 4 1 0 1 1 0 8 1 amappl14 184 412 0 411 1 0 1 1 0 8 0 amappl13 176 115 0 105 1 0 1 1 0 8 0 amappl12 168 738 0 711 2 0 2 2 0 8 0 amappl11 160 20 0 20 1 0 1 1 0 8 1 amappl10 152 61 0 51 1 0 1 1 0 8 0 amappl9 144 269 0 269 1 0 1 1 0 8 1 amappl8 136 103 0 102 1 0 1 1 0 8 0 amappl7 128 145 0 134 1 0 1 1 0 8 0 amappl6 120 150 0 148 1 0 1 1 0 8 0 amappl5 112 110 0 103 1 0 1 1 0 8 0 amappl4 104 265 0 250 1 0 1 1 0 8 0 amappl3 96 1899 0 1794 3 0 3 3 0 8 0 amappl2 88 523 0 468 2 0 2 2 0 8 0 amappl1 80 9858 0 9315 15 0 15 15 0 8 1 amappl 88 2982 0 2831 4 0 4 4 0 92 0 uvmvnodes 80 102 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 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 24 499 0 471 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 499 0 471 1 0 1 1 0 8 0 vmmpekpl 168 5861 0 5821 3 0 3 3 0 8 0 vmmpepl 168 40257 0 38478 91 0 91 91 0 357 3 vmsppl 368 498 0 471 4 0 4 4 0 8 1 rwobjpl 40 14439 0 13447 13 0 13 13 0 8 1 pdppl 4096 1004 0 942 94 26 68 80 0 8 6 pvpl 32 263132 0 235631 236 0 236 236 0 265 1 pmappl 216 498 0 471 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 365 0 26 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834198e4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8345603f,ffffffff834400cb,4e2,ffffffff833aebd6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075a8b00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cb175d0,99d7bd0000,99d7bd1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cb175d0,fffffd806cad0bf8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000318be7f8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff8000318be7f8,ffff80003c911ca0,ffff80003c911bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c911ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c911ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7048fe7ef590, count: -11 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834198e4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8345603f,ffffffff834400cb,4e2,ffffffff833aebd6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075a8b00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cb175d0,99d7bd0000,99d7bd1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cb175d0,fffffd806cad0bf8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cb175d0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000318be7f8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff8000318be7f8,ffff80003c911ca0,ffff80003c911bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c911ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c911ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7048fe7ef590, count: -11