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(ffffffff83413a5d) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452f99,ffffffff83438aad,4e2,ffffffff833a7aa4) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8006c5d300) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cce8460,200000234000,200000237000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cce8460,fffffd806b8338d0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cce8460) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cce8460) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000314c1ca0,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff8000314c1ca0,ffff80002a7c1490,ffff80002a7c13e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7c1490) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7c1490) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c21f9e0c150, 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(ffffffff83413a5d) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452f99,ffffffff83438aad,4e2,ffffffff833a7aa4) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8006c5d300) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cce8460,200000234000,200000237000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cce8460,fffffd806b8338d0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cce8460) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cce8460) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000314c1ca0,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff8000314c1ca0,ffff80002a7c1490,ffff80002a7c13e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7c1490) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7c1490) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c21f9e0c150, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a7c10d0 rbx 0xffff8000ffffb618 rdx 0 rcx 0 rax 0xffff8000314c1ca0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8bff4c19fc4e339c r11 0xbd3dc38668844bbc r12 0 r13 0xffffffff83659860 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff81100e95 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a7c10c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=199846 pid=90299 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=17, usrpri=53, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000314c1ca0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000314c0018,0xffff80002a7767e8 process=0xffff8000ffffb618 user=0xffff80002a7bc000, vmspace=0xfffffd806cce8460 estcpu=3, cpticks=4, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 6028 216514 28663 0 2 0 syz-executor 39308 426198 85038 0 4 0x82000 syz-executor 39308 75811 85038 0 3 0x4002000 suspend syz-executor 39308 435866 85038 0 2 0x4082000 syz-executor 97807 458474 89682 0 2 0 syz-executor 97807 211609 89682 0 3 0x4000080 fsleep syz-executor 16191 441181 1 0 3 0x82 nanoslp getty 32916 467794 37896 0 2 0 syz-executor 6321 181363 76926 0 2 0x2 syz-executor 92670 280219 76926 0 2 0xc82 syz-executor 90038 61886 76926 0 2 0xc82 syz-executor 37896 56080 76926 0 2 0x2 syz-executor 28663 247445 76926 0 2 0x2 syz-executor 85038 159610 76926 0 2 0xc82 syz-executor 89682 416961 76926 0 2 0xc82 syz-executor 85856 157501 76926 0 2 0x2 syz-executor 76926 424866 27390 0 2 0x2 syz-executor 27390 366451 1 0 3 0x100082 nanoslp ksh 60263 127390 1 0 3 0x1000008a kqread sshd 56863 480070 65554 73 3 0x1100090 kqread syslogd 65554 15105 1 0 3 0x100082 sbwait syslogd 44396 382396 1 0 3 0x100080 kqread resolvd 79962 291083 55242 77 3 0x100092 kqread dhcpleased 88856 117061 55242 77 3 0x100092 kqread dhcpleased 55242 357474 1 0 3 0x80 kqread dhcpleased 53083 32888 0 0 3 0x14200 bored smr 99572 517198 0 0 2 0x14200 zerothread 48286 13428 0 0 3 0x14200 aiodoned aiodoned 63255 23010 0 0 3 0x14200 syncer update 83160 76020 0 0 3 0x14200 cleaner cleaner 31132 366318 0 0 3 0x14200 reaper reaper 90656 65360 0 0 3 0x14200 pgdaemon pagedaemon 23452 206160 0 0 3 0x14200 bored viomb 19848 254138 0 0 3 0x40014200 acpi0 acpi0 56037 278464 0 0 2 0x14200 softnet0 38851 439528 0 0 3 0x14200 bored systqmp 2620 488786 0 0 3 0x14200 bored systq 26184 452111 0 0 3 0x40014200 tmoslp softclock 15257 265598 0 0 3 0x40014200 idle0 1 162004 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 11038 12100K 12345K 166960K 12242 0 pcb 17 12K 12K 166960K 39 0 rtable 253 8K 8K 166960K 394 0 pf 31 13K 15K 166960K 38 0 ifaddr 42 7K 7K 166960K 45 0 ifgroup 50 2K 2K 166960K 52 0 sysctl 3 1K 9K 166960K 7 0 counters 33 17K 17K 166960K 34 0 ioctlops 0 0K 4K 166960K 46 0 iov 0 0K 12K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 81K 82K 166960K 1451 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 9 0K 0K 166960K 75 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 97K 166960K 227 0 proc 59 59K 124K 166960K 519 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 22 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 5 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 2K 166960K 374 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 193 143K 160K 166960K 3727 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 32 64K 96K 166960K 1325 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 11 0K 1K 166960K 28 0 temp 70 9071K 9135K 166960K 11791 0 kqueue 11 16K 28K 166960K 46 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 40 0 37 1 0 1 1 0 8 0 rtentry 136 115 0 3 4 0 4 4 0 8 0 unpcb 144 91 0 79 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 75 0 72 4 0 4 4 0 8 3 arp 96 18 0 0 1 0 1 1 0 8 0 inpcb 328 172 0 166 5 0 5 5 0 8 3 nd6 112 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 1 0 1 1 0 1 1 0 8 1 pftag 88 2 0 0 1 0 1 1 0 8 0 pfrule 1360 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 461 0 0 29 0 29 29 0 8 0 art_table 40 463 0 0 5 0 5 5 0 8 0 art_node 32 113 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semapl 112 73 0 66 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1745 0 286 92 0 92 92 0 8 0 ffsino 256 1746 0 286 92 0 92 92 0 8 0 nchpl 144 2065 0 371 64 0 64 64 0 8 1 vnodes 216 1876 0 0 105 0 105 105 0 8 0 namei 1024 6591 0 6589 2 0 2 2 0 8 1 kstatmem 264 24 0 2 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 7261 0 7261 2 0 2 2 1 8 2 plimitpl 152 38 0 23 1 0 1 1 0 8 0 sigapl 424 521 0 481 6 0 6 6 0 8 1 knotepl 120 6721 0 6679 17 0 17 17 0 8 15 kqueuepl 184 40 0 33 1 0 1 1 0 8 0 pipepl 304 120 0 93 3 0 3 3 0 8 0 fdescpl 448 508 0 483 5 0 5 5 0 8 1 filepl 120 2162 0 1961 8 0 8 8 0 8 0 lockfpl 104 28 0 26 1 0 1 1 0 8 0 lockfspl 48 14 0 12 1 0 1 1 0 8 0 sessionpl 144 27 0 19 1 0 1 1 0 8 0 pgrppl 48 37 0 21 1 0 1 1 0 8 0 ucredpl 104 221 0 210 1 0 1 1 0 8 0 zombiepl 144 484 0 481 1 0 1 1 0 8 0 processpl 1152 521 0 481 4 0 4 4 0 8 0 procpl 664 680 0 637 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 552 305 0 284 5 0 5 5 0 8 2 mcl64k 65536 5 0 5 1 0 1 1 0 8 1 mcl8k 8192 4 0 4 1 0 1 1 0 8 1 mcl4k 4096 2620 0 2561 14 0 14 14 0 8 6 mcl2k 2048 194 0 194 1 0 1 1 0 8 1 mtagpl 96 7 0 4 1 0 1 1 0 8 0 mbufpl 256 5017 0 4859 14 0 14 14 0 8 4 bufpl 280 2740 0 104 189 0 189 189 0 8 0 anonpl 24 107975 0 103361 30 0 30 30 0 187 0 amapchunkpl 152 10834 0 10318 24 0 24 24 0 158 2 amappl16 200 1970 0 1948 5 0 5 5 0 8 1 amappl15 192 4 0 4 1 0 1 1 0 8 1 amappl14 184 408 0 407 1 0 1 1 0 8 0 amappl13 176 147 0 139 1 0 1 1 0 8 0 amappl12 168 746 0 721 2 0 2 2 0 8 0 amappl11 160 5 0 4 1 0 1 1 0 8 0 amappl10 152 79 0 68 1 0 1 1 0 8 0 amappl9 144 265 0 265 1 0 1 1 0 8 1 amappl8 136 99 0 98 1 0 1 1 0 8 0 amappl7 128 143 0 133 1 0 1 1 0 8 0 amappl6 120 150 0 149 1 0 1 1 0 8 0 amappl5 112 87 0 81 1 0 1 1 0 8 0 amappl4 104 282 0 266 1 0 1 1 0 8 0 amappl3 96 1980 0 1892 3 0 3 3 0 8 0 amappl2 88 511 0 468 2 0 2 2 0 8 0 amappl1 80 9784 0 9397 13 0 13 13 0 8 1 amappl 88 3024 0 2888 4 0 4 4 0 92 0 uvmvnodes 80 101 0 0 3 0 3 3 0 8 0 dma8192 8192 1 0 1 1 0 1 1 0 8 1 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 128 254 0 254 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 508 0 482 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 508 0 482 1 0 1 1 0 8 0 vmmpekpl 168 5942 0 5908 2 0 2 2 0 8 0 vmmpepl 168 40780 0 39375 81 0 81 81 0 357 9 vmsppl 368 507 0 482 4 0 4 4 0 8 1 rwobjpl 40 14771 0 13971 11 0 11 11 0 8 0 pdppl 4096 1022 0 964 96 30 66 82 0 8 8 pvpl 32 251087 0 244952 84 0 84 84 0 265 5 pmappl 216 507 0 482 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 366 0 30 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(ffffffff83413a5d) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452f99,ffffffff83438aad,4e2,ffffffff833a7aa4) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8006c5d300) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cce8460,200000234000,200000237000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cce8460,fffffd806b8338d0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cce8460) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cce8460) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000314c1ca0,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff8000314c1ca0,ffff80002a7c1490,ffff80002a7c13e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7c1490) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7c1490) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c21f9e0c150, count: -11 ddb>