panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1207 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(ffffffff834817bd) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c19cc,ffffffff834a7813,4b7,ffffffff83415d62) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff100072b6580) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff1006d180b90,17319a1000,1731da0000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff1006d180b90,fffff1006d179ed8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7787d8,0,0,1) at exit1+0x705 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7787d8,ffff80002a7b7c30,ffff80002a7b7b80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7b7c30) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7b7c30) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e6812265d60, 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 1207 ddb> show kasan No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834817bd) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c19cc,ffffffff834a7813,4b7,ffffffff83415d62) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff100072b6580) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff1006d180b90,17319a1000,1731da0000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff1006d180b90,fffff1006d179ed8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7787d8,0,0,1) at exit1+0x705 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7787d8,ffff80002a7b7c30,ffff80002a7b7b80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7b7c30) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7b7c30) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e6812265d60, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a7b7870 rbx 0xffff800045ffa078 rdx 0 rcx 0 rax 0xffff80002a7787d8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x44be7d83b6c7b886 r11 0x43c7837badccf7bc r12 0 r13 0xffffffff8375ced0 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff826b2ec5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a7b7860 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=7755 pid=43947 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a7787d8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a778a70,0xffff80002a7782b8 process=0xffff800045ff9f98 user=0xffff80002a7b2000, vmspace=0xfffff1006d180b90 estcpu=1, cpticks=5, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 92945 63275 59438 0 2 0 0 syz-executor 92945 105551 59438 0 3 0 0x4000080 fsleep syz-executor 40228 61356 28241 0 2 0 0xc80 syz-executor 40228 219203 28241 0 3 0 0x4000080 lockf syz-executor 40228 135623 28241 0 3 0 0x4000080 lockf syz-executor 40228 322432 28241 0 3 0 0x4000080 fsleep syz-executor 52857 322970 14170 0 2 0 0 syz-executor 52857 492468 14170 0 3 0 0x4000080 fsleep syz-executor 10922 38559 12485 0 2 0 0 syz-executor 10922 433109 12485 0 3 0 0x4000080 fifow syz-executor 10922 74209 12485 0 2 0 0x4000000 syz-executor 64654 146123 1 0 3 0x2 0x80 nanoslp getty 95689 423738 7283 0 2 0 0 syz-executor 95689 373613 7283 0 3 0 0x4000080 fsleep syz-executor 95689 350097 7283 0 3 0 0x4000080 fsleep syz-executor 38157 276129 22426 0 2 0 0 syz-executor 38157 164127 22426 0 3 0 0x4000080 lockf syz-executor 38157 205954 22426 0 3 0 0x4000080 lockf syz-executor 38157 292307 22426 0 2 0 0x4000000 syz-executor 78212 310599 3209 0 3 0x1000 0x2000 suspend syz-executor 78212 96767 3209 0 2 0x1000 0x4080000 syz-executor 78212 83057 3209 0 3 0x1000 0x4080000 inode syz-executor 78212 429943 3209 0 3 0x1000 0x4080000 inode syz-executor 86778 392132 16231 0 3 0x2 0x80 nanoslp syz-executor 28241 77779 16231 0 3 0x2 0x80 nanoslp syz-executor 59438 38062 16231 0 2 0x2 0xc80 syz-executor 3209 55668 16231 0 3 0x2 0x80 wait syz-executor 12485 320944 16231 0 2 0x2 0xc80 syz-executor 22426 274547 16231 0 2 0x2 0xc80 syz-executor 7283 401460 16231 0 2 0x2 0xc80 syz-executor 14170 276290 16231 0 2 0x2 0xc80 syz-executor 16231 316864 1 0 3 0x2 0x80 kqread syz-executor 40969 339045 1 73 2 0x1100010 0x80 syslogd 8332 259274 0 0 3 0x14000 0x200 bored smr 48054 133513 0 0 2 0x14000 0x200 zerothread 82154 511952 0 0 3 0x14000 0x200 aiodoned aiodoned 47833 492923 0 0 3 0x14000 0x200 syncer update 94127 23975 0 0 3 0x14000 0x200 cleaner cleaner 77173 313281 0 0 3 0x14000 0x200 reaper reaper 46938 407790 0 0 3 0x14000 0x200 pgdaemon pagedaemon 13172 67104 0 0 3 0x14000 0x200 bored viomb 21531 169568 0 0 3 0x14000 0x40000200 acpi0 acpi0 96157 25253 0 0 3 0x14000 0x200 bored softnet0 32123 336364 0 0 3 0x14000 0x200 bored systqmp 50762 144939 0 0 3 0x14000 0x200 bored systq 30197 164665 0 0 3 0x14000 0x40000200 tmoslp softclock 48841 58453 0 0 3 0x14000 0x40000200 idle0 1 377321 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11036 12229K 12299K 166960K 12191 0 pcb 17 14K 14K 166960K 85 0 rtable 217 6K 7K 166960K 363 0 pf 32 13K 14K 166960K 42 0 ifaddr 41 7K 8K 166960K 49 0 ifgroup 50 2K 2K 166960K 61 0 sysctl 3 1K 9K 166960K 8 0 counters 33 17K 18K 166960K 38 0 ioctlops 0 0K 4K 166960K 48 0 iov 0 0K 12K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 81K 82K 166960K 1498 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 17 61K 97K 166960K 205 0 sigio 0 0K 0K 166960K 1 0 proc 19 25K 116K 166960K 535 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 14 0 in_multi 96 7K 7K 166960K 102 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 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 546 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 165 85K 160K 166960K 3527 0 UVM aobj 7 2K 4K 166960K 8 0 pinsyscall 21 42K 96K 166960K 1319 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 11 0K 2K 166960K 30 0 temp 40 9111K 9127K 166960K 8939 0 kqueue 4 6K 28K 166960K 49 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 41 0 40 1 0 1 1 0 8 0 rtentry 136 113 0 14 4 0 4 4 0 8 0 unpcb 144 72 0 66 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 26 0 24 1 0 1 1 0 8 0 arp 96 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 218 0 181 7 0 7 7 0 8 2 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 112 24 0 0 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 1072 3 0 3 1 0 1 1 0 8 1 pppxif 1416 2 0 2 1 0 1 1 0 8 1 pfstscr 40 3 0 3 1 0 1 1 0 8 1 pfstkey 128 4 0 4 1 0 1 1 0 8 1 pfstate 384 2 0 2 1 0 1 1 0 8 1 pfrule 1360 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 459 0 47 29 0 29 29 0 8 1 art_table 40 460 0 47 5 0 5 5 0 8 0 art_node 32 113 0 24 1 0 1 1 0 8 0 semapl 72 5 0 0 1 0 1 1 0 8 0 shmpl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1774 0 311 92 0 92 92 0 8 0 ffsino 256 1774 0 311 92 0 92 92 0 8 0 nchpl 144 2072 0 376 63 0 63 63 0 8 0 vnodes 216 1887 0 0 105 0 105 105 0 8 0 namei 1024 6464 0 6462 2 0 2 2 0 8 1 kstatmem 264 29 0 6 2 0 2 2 0 8 0 scxspl 216 7953 0 7953 4 0 4 4 1 8 4 plimitpl 152 72 0 56 1 0 1 1 0 8 0 sigapl 424 504 0 470 6 0 6 6 0 8 1 knotepl 120 5764 0 5740 10 0 10 10 0 8 8 kqueuepl 184 46 0 43 1 0 1 1 0 8 0 pipepl 304 127 0 100 3 0 3 3 0 8 0 fdescpl 448 491 0 471 5 0 5 5 0 8 1 filepl 120 2373 0 2157 14 0 14 14 0 8 6 lockfpl 104 48 0 42 1 0 1 1 0 8 0 lockfspl 48 21 0 19 1 0 1 1 0 8 0 sessionpl 144 26 0 23 1 0 1 1 0 8 0 pgrppl 48 34 0 23 1 0 1 1 0 8 0 ucredpl 104 455 0 449 1 0 1 1 0 8 0 zombiepl 144 472 0 470 1 0 1 1 0 8 0 processpl 1152 504 0 470 4 0 4 4 0 8 0 procpl 664 624 0 575 5 0 5 5 0 8 0 sockpl 552 340 0 296 8 0 8 8 0 8 4 mcl64k 65536 7 0 6 1 0 1 1 0 8 0 mcl8k 8192 6 0 6 1 0 1 1 0 8 1 mcl4k 4096 2613 0 2563 15 0 15 15 0 8 8 mcl2k 2048 187 0 185 1 0 1 1 0 8 0 mextrefs 64 66 0 65 1 0 1 1 0 8 0 mtagpl 96 4 0 4 1 0 1 1 0 8 1 mbufpl 256 5047 0 4889 12 0 12 12 0 8 1 bufpl 272 5318 0 102 348 0 348 348 0 8 0 anonpl 24 91727 0 78122 82 0 82 82 0 187 0 amapchunkpl 152 10141 0 9425 28 0 28 28 0 158 0 amappl16 200 1337 0 916 23 0 23 23 0 8 0 amappl15 192 9 0 9 1 0 1 1 0 8 1 amappl14 184 410 0 410 1 0 1 1 0 8 1 amappl13 176 134 0 132 1 0 1 1 0 8 0 amappl12 168 728 0 708 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 0 1 1 0 8 1 amappl10 152 57 0 55 1 0 1 1 0 8 0 amappl9 144 269 0 269 1 0 1 1 0 8 1 amappl8 136 93 0 93 1 0 1 1 0 8 1 amappl7 128 145 0 140 1 0 1 1 0 8 0 amappl6 120 147 0 147 1 0 1 1 0 8 1 amappl5 112 90 0 89 1 0 1 1 0 8 0 amappl4 104 264 0 256 1 0 1 1 0 8 0 amappl3 96 1895 0 1800 3 0 3 3 0 8 0 amappl2 88 527 0 513 2 0 2 2 0 8 0 amappl1 80 10512 0 10349 13 0 13 13 0 8 3 amappl 88 2822 0 2678 4 0 4 4 0 92 0 uvmvnodes 80 97 0 0 2 0 2 2 0 8 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 2 0 1 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 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 491 0 470 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 491 0 470 1 0 1 1 0 8 0 vmmpekpl 168 5939 0 5911 2 0 2 2 0 8 0 vmmpepl 168 40040 0 38635 96 0 96 96 0 357 31 vmsppl 368 490 0 470 4 0 4 4 0 8 1 rwobjpl 40 14524 0 13625 14 0 14 14 0 8 0 pdppl 4096 988 0 940 96 42 54 82 0 8 6 pvpl 32 243340 0 212783 247 0 247 247 0 265 0 pmappl 216 490 0 470 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 708 0 42 20 0 20 20 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(ffffffff834817bd) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c19cc,ffffffff834a7813,4b7,ffffffff83415d62) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff100072b6580) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff1006d180b90,17319a1000,1731da0000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff1006d180b90,fffff1006d179ed8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7787d8,0,0,1) at exit1+0x705 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7787d8,ffff80002a7b7c30,ffff80002a7b7b80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7b7c30) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7b7c30) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e6812265d60, 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(ffffffff834817bd) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c19cc,ffffffff834a7813,4b7,ffffffff83415d62) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffff100072b6580) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffff1006d180b90,17319a1000,1731da0000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffff1006d180b90,fffff1006d179ed8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffff1006d180b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7787d8,0,0,1) at exit1+0x705 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7787d8,ffff80002a7b7c30,ffff80002a7b7b80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7b7c30) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7b7c30) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e6812265d60, count: -11 ddb>