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 17993 54831 0 0 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c0bd6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834faf87,ffffffff834f0024,4e2,ffffffff83451ba8) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffc0008e4f928) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffc006be953f0,7672849c000,7672889b000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffc006be953f0,fffffc006bdd7a98,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffc006be953f0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffc006be953f0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a223768,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80002a223768,ffff80002a229530,ffff80002a229480) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a229530) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a229530) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ab1e708dbf0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1250 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c0bd6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834faf87,ffffffff834f0024,4e2,ffffffff83451ba8) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffc0008e4f928) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffc006be953f0,7672849c000,7672889b000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffc006be953f0,fffffc006bdd7a98,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffc006be953f0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffc006be953f0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a223768,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80002a223768,ffff80002a229530,ffff80002a229480) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a229530) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a229530) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ab1e708dbf0, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a229150 rbx 0xffffffff8396ee07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80002a223768 rax 0xffffffff8396dff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x43eb1d3a28fc318a r11 0x1a4c7bbcfea79ab r12 0xffffffff8396ec08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff818d1ce5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a229140 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=51516 pid=85695 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a223768 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a2234d0,0xffff80002a223ca8 process=0xffff80003c3da1d0 user=0xffff80002a224000, vmspace=0xfffffc006be953f0 estcpu=36, cpticks=66, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61661 234798 68172 0 2 0 syz-executor 54831 17993 91710 0 7 0 syz-executor 54831 446209 91710 0 3 0x4000080 fsleep syz-executor 54831 436483 91710 0 2 0x4000000 syz-executor 97984 98928 57799 0 2 0xc80 syz-executor 97984 278946 57799 0 3 0x4000080 lockf syz-executor 97984 451502 57799 0 3 0x4000080 fsleep syz-executor 33106 467648 25973 0 2 0xc80 syz-executor 33106 268879 25973 0 3 0x4000080 msgwait syz-executor 33106 73460 25973 0 3 0x4000080 fsleep syz-executor 33106 403871 25973 0 3 0x4000080 fsleep syz-executor 17877 387783 1 0 3 0x80 nanoslp init 91710 44632 61005 0 2 0xc82 syz-executor 25973 95436 61005 0 2 0xc82 syz-executor 5619 34615 61005 0 2 0xc82 syz-executor 3578 489992 61005 0 3 0x82 wait syz-executor 28548 478974 61005 0 2 0xc82 syz-executor 18581 403129 61005 0 3 0x82 wait syz-executor 57799 428287 61005 0 2 0xc82 syz-executor 68172 150023 61005 0 2 0xc82 syz-executor 61005 512790 1 0 3 0x82 kqread syz-executor 6681 44039 0 0 3 0x14200 bored smr 38539 497935 0 0 3 0x14200 pgzero zerothread 44773 10575 0 0 3 0x14200 aiodoned aiodoned 5995 97471 0 0 3 0x14200 syncer update 23013 96087 0 0 3 0x14200 cleaner cleaner 49346 124511 0 0 3 0x14200 reaper reaper 30339 150841 0 0 3 0x14200 pgdaemon pagedaemon 18561 436343 0 0 3 0x14200 bored viomb 19854 266929 0 0 3 0x40014200 acpi0 acpi0 74810 513934 0 0 3 0x40014200 idle1 55299 120956 0 0 3 0x14200 bored softnet1 14634 487102 0 0 3 0x14200 bored softnet0 37919 502173 0 0 3 0x14200 bored systqmp 28802 491622 0 0 3 0x14200 bored systq 54757 519425 0 0 3 0x14200 tmoslp softclockmp 99901 257437 0 0 3 0x40014200 tmoslp softclock 77182 29765 0 0 3 0x40014200 idle0 1 331722 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11044 12012K 12216K 166960K 12259 0 pcb 19 12K 12K 166960K 49 0 rtable 203 7K 8K 166960K 391 0 pf 32 17K 18K 166960K 58 0 ifaddr 34 5K 6K 166960K 47 0 ifgroup 47 2K 2K 166960K 62 0 sysctl 3 1K 9K 166960K 7 0 counters 66 36K 37K 166960K 78 0 ioctlops 0 0K 4K 166960K 1602 0 iov 0 0K 21K 166960K 71 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1314 83K 83K 166960K 1456 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 7 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 61K 89K 166960K 237 0 sigio 0 0K 0K 166960K 2 0 proc 12 17K 164K 166960K 571 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 1 0K 0K 166960K 13 0 in_multi 76 5K 6K 166960K 107 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 395 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 127 80K 160K 166960K 4053 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 18 36K 102K 166960K 1398 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 10 0K 1K 166960K 30 0 temp 35 9110K 9174K 166960K 4997 0 kqueue 1 2K 28K 166960K 47 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 80 0 80 2 0 2 2 0 8 2 rtentry 176 111 0 26 5 0 5 5 0 8 0 unpcb 144 87 0 86 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 34 0 33 1 0 1 1 0 8 0 arp 136 18 0 4 1 0 1 1 0 8 0 inpcb 328 176 0 172 4 0 4 4 0 8 3 nd6 152 24 0 6 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 3 0 3 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 448 20 0 0 3 0 3 3 0 8 0 pfrule 1360 23 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 94 26 0 26 26 0 8 3 art_table 40 453 0 94 5 0 5 5 0 8 0 art_node 32 111 0 34 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 72 7 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1755 0 284 93 0 93 93 0 8 0 ffsino 296 1755 0 284 114 0 114 114 0 8 0 nchpl 144 2091 0 386 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 1911 0 0 107 0 107 107 0 8 0 namei 1024 6626 0 6626 2 0 2 2 0 8 2 percpumem 16 54 0 6 1 0 1 1 0 8 0 kstatmem 264 31 0 8 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 9019 0 9019 10 2 8 8 1 8 8 plimitpl 152 42 0 31 1 0 1 1 0 8 0 sigapl 424 556 0 520 7 0 7 7 0 8 1 knotepl 120 475 0 0 15 0 15 15 0 8 0 kqueuepl 224 53 0 52 1 0 1 1 0 8 0 pipepl 344 135 0 108 3 0 3 3 0 8 0 fdescpl 528 540 0 521 3 0 3 3 0 8 0 filepl 160 2277 0 2114 11 0 11 11 0 8 0 lockfpl 104 53 0 51 1 0 1 1 0 8 0 lockfspl 48 19 0 18 1 0 1 1 0 8 0 sessionpl 144 29 0 27 1 0 1 1 0 8 0 pgrppl 48 37 0 27 1 0 1 1 0 8 0 ucredpl 104 208 0 205 1 0 1 1 0 8 0 zombiepl 144 524 0 520 1 0 1 1 0 8 0 processpl 1232 556 0 520 5 0 5 5 0 8 0 procpl 664 747 0 704 6 0 6 6 0 8 0 sockpl 752 348 0 343 8 0 8 8 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 33 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 258 0 0 17 0 17 17 0 8 0 bufpl 280 6762 0 532 446 0 446 446 0 8 0 anonpl 32 6269 0 0 51 0 51 51 0 246 0 amapchunkpl 152 12126 0 11524 24 0 24 24 0 158 0 amappl16 200 1994 0 1969 14 3 11 14 0 8 8 amappl15 192 7 0 7 2 2 0 1 0 8 0 amappl14 184 444 0 444 1 0 1 1 0 8 1 amappl13 176 123 0 122 1 0 1 1 0 8 0 amappl12 168 786 0 769 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 65 0 65 1 0 1 1 0 8 1 amappl9 144 274 0 274 1 0 1 1 0 8 1 amappl8 136 100 0 100 1 0 1 1 0 8 1 amappl7 128 145 0 143 1 0 1 1 0 8 0 amappl6 120 178 0 178 1 0 1 1 0 8 1 amappl5 112 98 0 97 1 0 1 1 0 8 0 amappl4 104 362 0 360 1 0 1 1 0 8 0 amappl3 96 2239 0 2164 3 0 3 3 0 8 0 amappl2 88 540 0 534 2 0 2 2 0 8 0 amappl1 80 10854 0 10759 15 0 15 15 0 8 8 amappl 88 3247 0 3130 4 0 4 4 0 92 0 uvmvnodes 80 104 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 128 255 0 255 2 1 1 1 0 8 1 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 540 0 520 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 540 0 520 1 0 1 1 0 8 0 vmmpekpl 168 6448 0 6413 2 0 2 2 0 8 0 vmmpepl 168 43975 0 43137 87 0 87 87 0 357 43 vmsppl 488 539 0 520 5 0 5 5 0 8 0 rwobjpl 80 15816 0 15441 24 0 24 24 0 8 4 pdppl 4096 1087 0 1040 95 48 47 83 0 8 0 pvpl 32 23880 0 0 194 1 193 193 0 265 0 pmappl 256 539 0 520 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 275 0 51 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c0bd6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834faf87,ffffffff834f0024,4e2,ffffffff83451ba8) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffc0008e4f928) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffc006be953f0,7672849c000,7672889b000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffc006be953f0,fffffc006bdd7a98,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffc006be953f0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffc006be953f0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a223768,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80002a223768,ffff80002a229530,ffff80002a229480) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a229530) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a229530) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ab1e708dbf0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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: 0x715925e37ac0, count: 12 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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: 0x715925e37ac0, count: -3 ddb{1}>