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(ffffffff83415ea8) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83457b50,ffffffff83442ca1,4e2,ffffffff833b1785) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800792ee80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca6e748,a2f244e6000,a2f244e7000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca6e748,fffffd807ae38ab0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76a548,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76a548,ffff80003c931030,ffff80003c930f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c931030) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c931030) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b11c4199140, 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(ffffffff83415ea8) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83457b50,ffffffff83442ca1,4e2,ffffffff833b1785) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800792ee80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca6e748,a2f244e6000,a2f244e7000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca6e748,fffffd807ae38ab0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76a548,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76a548,ffff80003c931030,ffff80003c930f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c931030) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c931030) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b11c4199140, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003c930c70 rbx 0xffff800035cdd218 rdx 0 rcx 0 rax 0xffff80002a76a548 r8 0x101010101010101 r9 0x8080808080808080 r10 0xdb4dab3fb5946d80 r11 0x61b48ac5f4aff77b r12 0 r13 0xffffffff8373e4d0 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff818d7995 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c930c60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=215526 pid=82486 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=52, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a76a548 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800035cdad18,0xffff80002a76b250 process=0xffff800035cdd218 user=0xffff80003c92c000, vmspace=0xfffffd806ca6e748 estcpu=2, cpticks=6, pctcpu=0.3, user=0, sys=3, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 68647 483589 66670 0 2 0 syz-executor 68647 109477 66670 0 2 0x4000000 syz-executor 17859 435948 62216 0 2 0 syz-executor 17859 141204 62216 0 3 0x4000080 fsleep syz-executor 12913 510129 686 0 2 0 syz-executor 12913 247529 686 0 3 0x4000000 smrbar syz-executor 12913 139708 686 0 3 0x4000080 fsleep syz-executor 62216 520104 97633 0 2 0xc82 syz-executor 25100 392059 97633 0 2 0xc82 syz-executor 16772 295949 97633 0 2 0xc82 syz-executor 686 135279 97633 0 2 0xc82 syz-executor 30580 149526 97633 0 2 0x2 syz-executor 66670 456253 97633 0 2 0xc82 syz-executor 75689 75576 97633 0 2 0xc82 syz-executor 40730 178175 97633 0 2 0x2 syz-executor 97633 427246 86654 0 3 0x82 kqread syz-executor 86654 35101 94124 0 3 0x10008a sigsusp ksh 94124 116352 4257 0 3 0x98 kqread sshd-session 4257 396818 49412 0 3 0x92 kqread sshd-session 22014 461987 1 0 3 0x100083 ttyin getty 49412 467798 1 0 3 0x88 kqread sshd 64738 97070 40503 73 2 0x1100090 syslogd 40503 466451 1 0 3 0x100082 sbwait syslogd 87125 441759 1 0 3 0x100080 kqread resolvd 79482 395651 14228 77 3 0x100092 kqread dhcpleased 70522 411404 14228 77 3 0x100092 kqread dhcpleased 14228 478850 1 0 3 0x80 kqread dhcpleased 92179 364885 0 0 3 0x14200 bored smr 25862 139709 0 0 2 0x14200 zerothread 99294 481045 0 0 3 0x14200 aiodoned aiodoned 10045 156347 0 0 3 0x14200 syncer update 99468 111304 0 0 3 0x14200 cleaner cleaner 58103 502702 0 0 3 0x14200 reaper reaper 26369 341965 0 0 3 0x14200 pgdaemon pagedaemon 34844 302320 0 0 3 0x14200 bored viomb 84128 88950 0 0 3 0x40014200 acpi0 acpi0 30922 259878 0 0 3 0x14200 bored softnet0 82188 394214 0 0 3 0x14200 bored systqmp 40603 85767 0 0 3 0x14200 bored systq 2079 151945 0 0 3 0x40014200 tmoslp softclock 34050 340567 0 0 3 0x40014200 idle0 1 63199 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 11047 12245K 12245K 166960K 12177 0 pcb 17 12K 12K 166960K 24 0 rtable 249 8K 8K 166960K 377 0 pf 36 14K 14K 166960K 42 0 ifaddr 44 7K 7K 166960K 51 0 ifgroup 57 2K 2K 166960K 63 0 sysctl 3 1K 9K 166960K 7 0 counters 37 18K 18K 166960K 40 0 ioctlops 0 0K 4K 166960K 46 0 iov 0 0K 16K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1299 82K 82K 166960K 1436 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 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 93K 166960K 173 0 proc 59 59K 75K 166960K 505 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 4 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 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 369 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 215 160K 180K 166960K 3415 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 36 72K 94K 166960K 1277 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 13 0K 2K 166960K 32 0 temp 35 9066K 9130K 166960K 4002 0 kqueue 14 22K 27K 166960K 34 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 39 0 36 1 0 1 1 0 8 0 rtentry 136 112 0 1 4 0 4 4 0 8 0 unpcb 144 58 0 38 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 24 0 19 1 0 1 1 0 8 0 arp 96 18 0 0 1 0 1 1 0 8 0 inpcb 328 95 0 87 2 0 2 2 0 8 1 nd6 112 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 6 0 3 1 0 1 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 2 0 0 1 0 1 1 0 8 0 pfstate 384 1 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 484 0 0 31 0 31 31 0 8 0 art_table 40 485 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1671 0 210 92 0 92 92 0 8 0 ffsino 256 1671 0 210 92 0 92 92 0 8 0 nchpl 144 1903 0 215 64 0 64 64 0 8 0 rtmask 32 2 0 0 1 0 1 1 0 8 0 vnodes 216 1774 0 0 99 0 99 99 0 8 0 namei 1024 5773 0 5772 1 0 1 1 0 8 0 kstatmem 264 33 0 6 2 0 2 2 0 8 0 scxspl 216 6175 0 6175 3 0 3 3 1 8 3 plimitpl 152 32 0 15 1 0 1 1 0 8 0 sigapl 424 469 0 428 6 0 6 6 0 8 1 knotepl 120 4388 0 4115 12 1 11 12 0 8 2 kqueuepl 184 36 0 26 1 0 1 1 0 8 0 pipepl 304 121 0 94 3 0 3 3 0 8 0 fdescpl 448 456 0 429 5 0 5 5 0 8 1 filepl 120 1855 0 1637 8 0 8 8 0 8 0 lockfpl 104 27 0 23 1 0 1 1 0 8 0 lockfspl 48 16 0 12 1 0 1 1 0 8 0 sessionpl 144 22 0 14 1 0 1 1 0 8 0 pgrppl 48 30 0 14 1 0 1 1 0 8 0 ucredpl 104 251 0 240 1 0 1 1 0 8 0 zombiepl 144 431 0 428 1 0 1 1 0 8 0 processpl 1152 469 0 428 4 0 4 4 0 8 0 procpl 664 538 0 493 5 0 5 5 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 195 0 164 4 0 4 4 0 8 1 mcl64k 65536 2 0 2 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 5 0 5 1 0 1 1 0 8 1 mcl4k 4096 2538 0 2487 14 0 14 14 0 8 6 mcl2k 2048 151 0 149 1 0 1 1 0 8 0 mtagpl 96 4 0 4 1 0 1 1 0 8 1 mbufpl 256 5421 0 5278 16 0 16 16 0 8 6 bufpl 280 4547 0 102 318 0 318 318 0 8 0 anonpl 24 107725 0 99871 51 0 51 51 0 187 0 amapchunkpl 152 9823 0 9114 30 0 30 30 0 158 1 amappl16 200 1949 0 1926 5 0 5 5 0 8 3 amappl15 192 9 0 9 1 0 1 1 0 8 1 amappl14 184 410 0 409 1 0 1 1 0 8 0 amappl13 176 117 0 106 1 0 1 1 0 8 0 amappl12 168 693 0 666 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 0 1 1 0 8 1 amappl10 152 55 0 45 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 0 1 1 0 8 1 amappl8 136 115 0 114 1 0 1 1 0 8 0 amappl7 128 141 0 130 1 0 1 1 0 8 0 amappl6 120 157 0 154 1 0 1 1 0 8 0 amappl5 112 87 0 80 1 0 1 1 0 8 0 amappl4 104 259 0 243 1 0 1 1 0 8 0 amappl3 96 1641 0 1537 3 0 3 3 0 8 0 amappl2 88 527 0 475 2 0 2 2 0 8 0 amappl1 80 9682 0 9140 15 0 15 15 0 8 0 amappl 88 2708 0 2556 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 456 0 428 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 456 0 428 1 0 1 1 0 8 0 vmmpekpl 168 5565 0 5532 2 0 2 2 0 8 0 vmmpepl 168 38010 0 36303 91 0 91 91 0 357 4 vmsppl 368 455 0 428 4 0 4 4 0 8 1 rwobjpl 40 14331 0 13407 12 0 12 12 0 8 1 pdppl 4096 918 0 856 98 26 72 80 0 8 10 pvpl 32 248760 0 230769 230 0 230 230 0 265 66 pmappl 216 455 0 428 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 366 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(ffffffff83415ea8) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83457b50,ffffffff83442ca1,4e2,ffffffff833b1785) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800792ee80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca6e748,a2f244e6000,a2f244e7000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca6e748,fffffd807ae38ab0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76a548,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76a548,ffff80003c931030,ffff80003c930f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c931030) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c931030) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b11c4199140, 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(ffffffff83415ea8) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83457b50,ffffffff83442ca1,4e2,ffffffff833b1785) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800792ee80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca6e748,a2f244e6000,a2f244e7000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca6e748,fffffd807ae38ab0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca6e748) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76a548,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76a548,ffff80003c931030,ffff80003c930f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c931030) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c931030) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b11c4199140, count: -11