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(ffffffff83483a98) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834bec63,ffffffff834a7755,4e2,ffffffff83415ccf) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8007b69a80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806d41ae70,211e7a84000,211e7e83000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806d41ae70,fffffd806d2946e0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002f8b22b8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002f8b22b8,ffff80002cca9ca0,ffff80002cca9bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002cca9ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002cca9ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761464eb3df0, 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(ffffffff83483a98) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834bec63,ffffffff834a7755,4e2,ffffffff83415ccf) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8007b69a80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806d41ae70,211e7a84000,211e7e83000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806d41ae70,fffffd806d2946e0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002f8b22b8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002f8b22b8,ffff80002cca9ca0,ffff80002cca9bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002cca9ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002cca9ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761464eb3df0, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002cca98e0 rbx 0xffff8000ffffad18 rdx 0 rcx 0 rax 0xffff80002f8b22b8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x3c03f810d5f95d4f r11 0x58b48f1448e3fb17 r12 0 r13 0xffffffff83760b80 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff827072e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002cca98d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=226266 pid=95433 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=0, usrpri=81, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002f8b22b8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002f8b3ca8,0xffff80002f0b07f0 process=0xffff8000ffffad18 user=0xffff80002cca4000, vmspace=0xfffffd806d41ae70 estcpu=31, cpticks=3, pctcpu=0.1, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 72321 167107 34310 0 2 0 syz-executor 72321 126946 34310 0 3 0x4000080 fsleep syz-executor 61133 259743 63144 0 2 0 syz-executor 61133 276371 63144 0 3 0x4000080 fsleep syz-executor 82100 422157 1 0 3 0x82 nanoslp getty 60413 254588 4011 0 2 0 syz-executor 60413 344773 4011 0 3 0x4000080 fsleep syz-executor 25152 435451 36632 0 2 0xc90 syz-executor 25152 123508 36632 0 3 0x4000090 lockf syz-executor 25152 472833 36632 0 3 0x4000090 fsleep syz-executor 14164 258079 92454 0 2 0xc80 syz-executor 14164 246036 92454 0 3 0x4000080 sbwait syz-executor 14164 511818 92454 0 3 0x4000080 fsleep syz-executor 4982 289833 43169 0 2 0xc80 syz-executor 4982 140512 43169 0 3 0x4000080 lockf syz-executor 4982 124281 43169 0 3 0x4000080 fsleep syz-executor 4982 481512 43169 0 3 0x4000080 fsleep syz-executor 4011 312530 52741 0 2 0xc82 syz-executor 36632 102528 52741 0 2 0xc82 syz-executor 92454 26884 52741 0 2 0xc82 syz-executor 63144 37862 52741 0 2 0xc82 syz-executor 43169 174729 52741 0 2 0xc82 syz-executor 34310 50273 52741 0 2 0xc82 syz-executor 98086 138429 52741 0 2 0x2 syz-executor 36367 362252 52741 0 2 0xc82 syz-executor 52741 301218 12138 0 3 0x82 kqread syz-executor 12138 418640 27140 0 3 0x10008a sigsusp ksh 27140 373634 37186 0 3 0x98 kqread sshd-session 37186 74650 25439 0 3 0x92 kqread sshd-session 25439 400250 1 0 3 0x88 kqread sshd 39544 440274 20475 73 3 0x1100090 kqread syslogd 20475 318699 1 0 3 0x100082 sbwait syslogd 11423 35891 1 0 3 0x100080 kqread resolvd 8188 362127 33915 77 3 0x100092 kqread dhcpleased 80526 94148 33915 77 3 0x100092 kqread dhcpleased 33915 15740 1 0 3 0x80 kqread dhcpleased 386 406328 0 0 3 0x14200 bored smr 30530 354656 0 0 2 0x14200 zerothread 11074 502825 0 0 3 0x14200 aiodoned aiodoned 66293 201264 0 0 3 0x14200 syncer update 57802 437518 0 0 3 0x14200 cleaner cleaner 92478 265830 0 0 3 0x14200 reaper reaper 70026 282403 0 0 3 0x14200 pgdaemon pagedaemon 97922 30859 0 0 3 0x14200 bored viomb 24424 82114 0 0 3 0x40014200 acpi0 acpi0 22165 13549 0 0 3 0x14200 bored softnet0 56067 485542 0 0 3 0x14200 bored systqmp 16073 303797 0 0 3 0x14200 bored systq 76554 320742 0 0 3 0x40014200 tmoslp softclock 73437 364759 0 0 3 0x40014200 idle0 1 432799 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 11078 12184K 13298K 166960K 13093 0 pcb 17 12K 12K 166960K 104 0 rtable 195 16K 17K 166960K 443 0 pf 34 13K 19K 166960K 97 0 ifaddr 33 5K 7K 166960K 64 0 ifgroup 54 2K 2K 166960K 96 0 sysctl 3 1K 9K 166960K 13 0 counters 34 17K 18K 166960K 64 0 ioctlops 0 0K 4K 166960K 117 0 iov 0 0K 18K 166960K 90 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1413 89K 89K 166960K 1917 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 62 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 616 0 sigio 0 0K 0K 166960K 38 0 proc 60 59K 91K 166960K 584 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 132 0 in_multi 63 4K 7K 166960K 107 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 599 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 224 153K 168K 166960K 6931 0 UVM aobj 10 2K 2K 166960K 11 0 pinsyscall 37 74K 93K 166960K 1711 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 19 0 NDP 12 0K 2K 166960K 45 0 temp 75 9116K 9182K 166960K 26668 0 kqueue 14 22K 34K 166960K 115 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 59 0 56 1 0 1 1 0 8 0 rtentry 136 126 0 53 4 0 4 4 0 8 0 unpcb 144 601 0 582 8 0 8 8 0 8 7 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 251 0 246 7 0 7 7 0 8 6 arp 96 24 0 8 1 0 1 1 0 8 0 ipq 40 4 0 1 1 0 1 1 0 8 0 ipqe 40 37 0 34 1 0 1 1 0 8 0 inpcb 328 689 0 678 7 0 7 7 0 8 5 ip6q 72 4 0 2 1 0 1 1 0 8 0 ip6af 40 6 0 4 1 0 1 1 0 8 0 nd6 112 27 0 9 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 27 0 27 1 0 1 1 0 8 1 pfstscr 40 2 0 0 1 0 1 1 0 8 0 pfrktable 1344 3 0 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 128 4 0 0 1 0 1 1 0 8 0 pfstate 384 2 0 0 1 0 1 1 0 8 0 pfrule 1360 7 0 6 1 0 1 1 0 8 0 rttmr 136 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 518 0 207 29 0 29 29 0 8 5 art_table 40 519 0 207 5 0 5 5 0 8 0 art_node 32 125 0 59 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 58 0 48 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2505 0 1054 92 0 92 92 0 8 0 ffsino 256 2505 0 1054 92 0 92 92 0 8 0 nchpl 144 3374 0 1678 64 0 64 64 0 8 0 rtmask 32 10 0 10 1 0 1 1 0 8 1 vnodes 216 2928 0 0 163 0 163 163 0 8 0 namei 1024 11795 0 11794 2 0 2 2 0 8 1 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 59 0 34 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 12781 0 12781 8 0 8 8 1 8 8 plimitpl 152 301 0 283 1 0 1 1 0 8 0 sigapl 424 900 0 858 6 0 6 6 0 8 1 knotepl 120 23875 0 23826 12 1 11 12 0 8 7 kqueuepl 184 170 0 159 1 0 1 1 0 8 0 pipepl 304 141 0 113 3 0 3 3 0 8 0 fdescpl 448 887 0 859 5 0 5 5 0 8 1 filepl 120 5615 0 5266 17 0 17 17 0 8 4 lockfpl 104 598 0 462 4 0 4 4 0 8 0 lockfspl 48 158 0 154 1 0 1 1 0 8 0 sessionpl 144 36 0 29 1 0 1 1 0 8 0 pgrppl 48 111 0 96 1 0 1 1 0 8 0 ucredpl 104 958 0 946 1 0 1 1 0 8 0 zombiepl 144 859 0 858 1 0 1 1 0 8 0 processpl 1152 900 0 858 4 0 4 4 0 8 0 procpl 664 1618 0 1566 6 0 6 6 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 1408 0 1375 22 5 17 17 0 8 13 mcl64k 65536 51 0 51 1 0 1 1 0 8 1 mcl16k 16384 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 51 0 49 3 0 3 3 0 8 2 mcl4k 4096 3149 0 3093 14 0 14 14 0 8 6 mcl2k 2048 587 0 584 2 0 2 2 0 8 1 mtagpl 96 10 0 7 1 0 1 1 0 8 0 mbufpl 256 9375 0 9188 14 0 14 14 0 8 1 bufpl 280 6869 0 653 445 0 445 445 0 8 0 anonpl 24 135876 0 127919 53 0 53 53 0 186 4 amapchunkpl 152 22999 0 22250 30 0 30 30 0 158 0 amappl16 200 2181 0 2144 15 3 12 15 0 8 8 amappl15 192 35 0 35 1 0 1 1 0 8 1 amappl14 184 406 0 405 1 0 1 1 0 8 0 amappl13 176 117 0 107 1 0 1 1 0 8 0 amappl12 168 1126 0 1098 2 0 2 2 0 8 0 amappl11 160 30 0 30 1 0 1 1 0 8 1 amappl10 152 57 0 47 1 0 1 1 0 8 0 amappl9 144 273 0 273 1 0 1 1 0 8 1 amappl8 136 92 0 91 1 0 1 1 0 8 0 amappl7 128 150 0 138 1 0 1 1 0 8 0 amappl6 120 148 0 146 1 0 1 1 0 8 0 amappl5 112 94 0 85 1 0 1 1 0 8 0 amappl4 104 274 0 256 1 0 1 1 0 8 0 amappl3 96 4575 0 4457 4 0 4 4 0 8 0 amappl2 88 532 0 476 2 0 2 2 0 8 0 amappl1 80 12130 0 11580 13 0 13 13 0 8 1 amappl 88 6146 0 5984 5 0 5 5 0 92 0 uvmvnodes 80 110 0 0 3 0 3 3 0 8 0 dma8192 8192 2 0 2 1 0 1 1 0 8 1 dma4096 4096 2 0 2 1 0 1 1 0 8 1 dma2048 2048 2 0 2 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 887 0 858 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 887 0 858 1 0 1 1 0 8 0 vmmpekpl 168 8591 0 8557 2 0 2 2 0 8 0 vmmpepl 168 63293 0 61483 91 0 91 91 0 357 9 vmsppl 368 886 0 858 4 0 4 4 0 8 1 rwobjpl 40 19312 0 18327 13 0 13 13 0 8 0 pdppl 4096 1780 0 1716 94 28 66 78 0 8 2 pvpl 32 398917 0 370708 236 0 236 236 0 265 5 pmappl 216 886 0 858 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 371 0 28 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(ffffffff83483a98) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834bec63,ffffffff834a7755,4e2,ffffffff83415ccf) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8007b69a80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806d41ae70,211e7a84000,211e7e83000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806d41ae70,fffffd806d2946e0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002f8b22b8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002f8b22b8,ffff80002cca9ca0,ffff80002cca9bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002cca9ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002cca9ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761464eb3df0, 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(ffffffff83483a98) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834bec63,ffffffff834a7755,4e2,ffffffff83415ccf) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8007b69a80) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806d41ae70,211e7a84000,211e7e83000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806d41ae70,fffffd806d2946e0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806d41ae70) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002f8b22b8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002f8b22b8,ffff80002cca9ca0,ffff80002cca9bf0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002cca9ca0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002cca9ca0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761464eb3df0, count: -11