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(ffffffff834843e9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301f,ffffffff834ac7dd,4e2,ffffffff8341aee4) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(ffffee000791e680) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(ffffee007ec5f5c0,966a3dca000,966a3dcb000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(ffffee007ec5f5c0,ffffee006f72bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c8fba10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80003c8fba10,ffff8000338bd500,ffff8000338bd450) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000338bd500) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338bd500) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7be07ecc1730, 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(ffffffff834843e9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301f,ffffffff834ac7dd,4e2,ffffffff8341aee4) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(ffffee000791e680) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(ffffee007ec5f5c0,966a3dca000,966a3dcb000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(ffffee007ec5f5c0,ffffee006f72bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c8fba10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80003c8fba10,ffff8000338bd500,ffff8000338bd450) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000338bd500) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338bd500) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7be07ecc1730, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000338bd140 rbx 0xffff8000ffffa898 rdx 0 rcx 0 rax 0xffff80003c8fba10 r8 0x101010101010101 r9 0x8080808080808080 r10 0x7dab01eecbd228bf r11 0x9035890e7a062c58 r12 0 r13 0xffffffff83576e40 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff826b2e55 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000338bd130 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=155226 pid=9424 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=53, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c8fba10 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c8fa550,0xffff80002f0b1250 process=0xffff8000ffffa898 user=0xffff8000338b8000, vmspace=0xffffee007ec5f5c0 estcpu=3, cpticks=8, pctcpu=0.0, user=0, sys=3, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 24039 394783 55708 0 2 0 syz-executor 23619 188506 28366 0 2 0xc80 syz-executor 23619 303959 28366 0 2 0x4000000 syz-executor 34532 109864 48153 0 2 0xc80 syz-executor 34532 126496 48153 0 3 0x4000080 kqread syz-executor 30727 203189 36306 0 2 0xc80 syz-executor 30727 524213 36306 0 3 0x4000080 lockf syz-executor 30727 62937 36306 0 3 0x4000080 fsleep syz-executor 83801 201541 78018 0 2 0xc80 syz-executor 83801 331360 78018 0 3 0x4000080 kqpoll syz-executor 83801 366898 78018 0 3 0x4000080 fsleep syz-executor 73633 444642 29332 0 2 0xc80 syz-executor 73633 179564 29332 0 3 0x4000080 fsleep syz-executor 73633 82277 29332 0 3 0x4000080 ttyin syz-executor 8777 200183 1 0 3 0x82 nanoslp getty 36306 270308 2675 0 2 0xc82 syz-executor 55708 140988 2675 0 2 0x2 syz-executor 25084 268391 2675 0 2 0xc82 syz-executor 48153 308644 2675 0 2 0xc82 syz-executor 68291 380942 2675 0 2 0x2 syz-executor 28366 427714 2675 0 2 0xc82 syz-executor 29332 436228 2675 0 2 0xc82 syz-executor 78018 404644 2675 0 2 0xc82 syz-executor 2675 74536 1 0 2 0x2 syz-executor 68957 405855 1 73 2 0x1100090 syslogd 85271 371923 0 0 3 0x14200 bored smr 3003 499560 0 0 2 0x14200 zerothread 45424 489030 0 0 3 0x14200 aiodoned aiodoned 17323 394232 0 0 3 0x14200 syncer update 82462 413512 0 0 3 0x14200 cleaner cleaner 78480 277391 0 0 3 0x14200 reaper reaper 26820 412235 0 0 3 0x14200 pgdaemon pagedaemon 33919 167233 0 0 3 0x14200 bored viomb 63661 492174 0 0 3 0x40014200 acpi0 acpi0 46187 519936 0 0 3 0x14200 bored softnet0 87616 504342 0 0 3 0x14200 bored systqmp 48011 154478 0 0 3 0x14200 bored systq 2128 98666 0 0 2 0x40014200 softclock 94089 367249 0 0 3 0x40014200 idle0 1 2975 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 11028 12100K 12232K 166960K 12164 0 pcb 18 12K 12K 166960K 21 0 rtable 237 6K 6K 166960K 358 0 pf 30 12K 16K 166960K 35 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 2K 166960K 30 0 iov 0 0K 12K 166960K 36 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1297 82K 82K 166960K 1389 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 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 178 0 proc 20 25K 108K 166960K 510 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 6 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 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 376 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 151 110K 167K 166960K 3172 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 20 40K 94K 166960K 1292 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 19 1K 2K 166960K 28 0 temp 34 9102K 9166K 166960K 7074 0 kqueue 3 4K 22K 166960K 31 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 40 1 0 1 1 0 8 1 rtentry 136 111 0 1 4 0 4 4 0 8 0 unpcb 144 53 0 49 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 15 0 14 1 0 1 1 0 8 0 arp 96 18 0 0 1 0 1 1 0 8 0 inpcb 328 95 0 93 2 0 2 2 0 8 1 ip6q 72 3 0 0 1 0 1 1 0 8 0 ip6af 40 3 0 0 1 0 1 1 0 8 0 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 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 256 453 0 0 29 0 29 29 0 8 0 art_table 40 454 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 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 1626 0 164 92 0 92 92 0 8 0 ffsino 256 1626 0 164 92 0 92 92 0 8 0 nchpl 144 1878 0 188 63 0 63 63 0 8 0 vnodes 216 1730 0 0 97 0 97 97 0 8 0 namei 1024 5762 0 5761 2 0 2 2 0 8 1 kstatmem 264 25 0 2 2 0 2 2 0 8 0 scxspl 216 6451 0 6451 3 0 3 3 1 8 3 plimitpl 152 34 0 20 1 0 1 1 0 8 0 sigapl 424 477 0 444 6 0 6 6 0 8 1 knotepl 120 3790 0 3768 8 0 8 8 0 8 6 kqueuepl 184 35 0 30 1 0 1 1 0 8 0 pipepl 304 125 0 98 3 0 3 3 0 8 0 fdescpl 448 464 0 445 5 0 5 5 0 8 2 filepl 120 1758 0 1575 7 0 7 7 0 8 0 lockfpl 104 16 0 14 1 0 1 1 0 8 0 lockfspl 48 8 0 7 1 0 1 1 0 8 0 sessionpl 144 25 0 22 1 0 1 1 0 8 0 pgrppl 48 35 0 24 1 0 1 1 0 8 0 ucredpl 104 135 0 129 1 0 1 1 0 8 0 zombiepl 144 445 0 444 1 0 1 1 0 8 0 processpl 1152 477 0 444 4 0 4 4 0 8 0 procpl 664 542 0 501 5 0 5 5 0 8 0 sockpl 552 190 0 184 3 0 3 3 0 8 2 mcl64k 65536 12 0 9 1 0 1 1 0 8 0 mcl16k 16384 7 0 7 1 0 1 1 0 8 1 mcl8k 8192 5 0 5 1 0 1 1 0 8 1 mcl4k 4096 2578 0 2527 16 1 15 16 0 8 8 mcl2k 2048 130 0 130 1 0 1 1 0 8 1 mtagpl 96 4 0 4 1 0 1 1 0 8 1 mbufpl 256 4680 0 4532 10 0 10 10 0 8 0 bufpl 280 4954 0 102 347 0 347 347 0 8 0 anonpl 24 88675 0 80164 52 0 52 52 0 186 0 amapchunkpl 152 9018 0 8255 32 0 32 32 0 158 1 amappl16 200 1202 0 1186 4 0 4 4 0 8 3 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 503 0 503 1 0 1 1 0 8 1 amappl13 176 123 0 121 1 0 1 1 0 8 0 amappl12 168 708 0 689 2 0 2 2 0 8 0 amappl11 160 88 0 88 1 0 1 1 0 8 1 amappl10 152 59 0 57 1 0 1 1 0 8 0 amappl9 144 268 0 268 1 0 1 1 0 8 1 amappl8 136 150 0 150 1 0 1 1 0 8 1 amappl7 128 177 0 173 1 0 1 1 0 8 0 amappl6 120 149 0 149 1 0 1 1 0 8 1 amappl5 112 91 0 89 1 0 1 1 0 8 0 amappl4 104 266 0 259 1 0 1 1 0 8 0 amappl3 96 1654 0 1573 3 0 3 3 0 8 0 amappl2 88 535 0 520 2 0 2 2 0 8 0 amappl1 80 10326 0 10172 13 0 13 13 0 8 5 amappl 88 2461 0 2333 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 464 0 444 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 464 0 444 1 0 1 1 0 8 0 vmmpekpl 168 5718 0 5686 2 0 2 2 0 8 0 vmmpepl 168 38573 0 37651 79 0 79 79 0 357 31 vmsppl 368 463 0 444 4 0 4 4 0 8 1 rwobjpl 40 13894 0 13423 11 0 11 11 0 8 0 pdppl 4096 934 0 888 94 18 76 80 0 8 30 pvpl 32 235712 0 210056 212 0 212 212 0 265 3 pmappl 216 463 0 444 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 357 0 19 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(ffffffff834843e9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301f,ffffffff834ac7dd,4e2,ffffffff8341aee4) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(ffffee000791e680) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(ffffee007ec5f5c0,966a3dca000,966a3dcb000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(ffffee007ec5f5c0,ffffee006f72bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c8fba10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80003c8fba10,ffff8000338bd500,ffff8000338bd450) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000338bd500) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338bd500) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7be07ecc1730, 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(ffffffff834843e9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301f,ffffffff834ac7dd,4e2,ffffffff8341aee4) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(ffffee000791e680) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(ffffee007ec5f5c0,966a3dca000,966a3dcb000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(ffffee007ec5f5c0,ffffee006f72bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(ffffee007ec5f5c0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c8fba10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80003c8fba10,ffff8000338bd500,ffff8000338bd450) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000338bd500) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000338bd500) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7be07ecc1730, count: -11 ddb>