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(ffffffff8348466c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834beea1,ffffffff834a7470,4e2,ffffffff83415bf2) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80078d7180) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800b5785d8,78c8ebde000,78c8ebdf000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800b5785d8,fffffd806b749a40,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7374c8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7374c8,ffff8000328bdee0,ffff8000328bde30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000328bdee0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000328bdee0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a9e15f64400, 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(ffffffff8348466c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834beea1,ffffffff834a7470,4e2,ffffffff83415bf2) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80078d7180) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800b5785d8,78c8ebde000,78c8ebdf000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800b5785d8,fffffd806b749a40,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7374c8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7374c8,ffff8000328bdee0,ffff8000328bde30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000328bdee0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000328bdee0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a9e15f64400, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000328bdb20 rbx 0xffff8000ffffa898 rdx 0 rcx 0 rax 0xffff80002a7374c8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x924fddb6372e1960 r11 0xec217e2778d2a4ec r12 0 r13 0xffffffff836a0d10 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff81e92925 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000328bdb10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=266841 pid=31745 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a7374c8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000354c4020,0xffff80002f0b0028 process=0xffff8000ffffa898 user=0xffff8000328b8000, vmspace=0xfffffd800b5785d8 estcpu=1, cpticks=9, pctcpu=0.6, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 77326 275045 50151 0 2 0 syz-executor 77326 210041 50151 0 3 0x4000080 kqread syz-executor 77326 437545 50151 0 3 0x4000080 fsleep syz-executor 97429 119821 45717 0 2 0 syz-executor 97429 268271 45717 0 3 0x4000080 netacc syz-executor 97429 284831 45717 0 3 0x4000080 fsleep syz-executor 86062 153990 82171 0 2 0 syz-executor 86062 68776 82171 0 3 0x4000080 fsleep syz-executor 53645 381460 94485 -1 2 0x10 syz-executor 53645 361356 94485 -1 3 0x4000090 msgwait syz-executor 53645 216341 94485 -1 3 0x4000090 sbwait syz-executor 53645 182470 94485 -1 3 0x4000090 fsleep syz-executor 64249 447701 49483 0 2 0 syz-executor 64249 262719 49483 0 3 0x4000080 fsleep syz-executor 64249 312095 49483 0 3 0x4000080 fsleep syz-executor 83999 130375 43085 60928 2 0x10 syz-executor 83999 493080 43085 60928 3 0x4000090 fsleep syz-executor 83999 314216 43085 60928 3 0x4000090 fsleep syz-executor 33054 189284 70067 0 2 0 syz-executor 33054 10490 70067 0 3 0x4000080 fsleep syz-executor 45717 187808 89005 0 2 0xc82 syz-executor 94485 337479 89005 0 2 0xc82 syz-executor 49483 164761 89005 0 2 0xc82 syz-executor 70067 470293 89005 0 2 0xc82 syz-executor 43085 409696 89005 0 2 0xc82 syz-executor 82171 279280 89005 0 2 0xc82 syz-executor 50151 289411 89005 0 2 0xc82 syz-executor 57001 191401 89005 0 2 0xc82 syz-executor 89005 31216 75455 0 3 0x82 kqread syz-executor 75455 26497 75825 0 3 0x10008a sigsusp ksh 75825 298349 11616 0 3 0x98 kqread sshd-session 11616 165263 56287 0 3 0x92 kqread sshd-session 27182 259731 1 0 3 0x100083 ttyin getty 56287 382010 1 0 3 0x88 kqread sshd 58463 390101 57420 73 3 0x1100090 kqread syslogd 57420 152222 1 0 3 0x100082 sbwait syslogd 62587 218001 1 0 3 0x100080 kqread resolvd 86220 367617 4628 77 3 0x100092 kqread dhcpleased 76654 74331 4628 77 3 0x100092 kqread dhcpleased 4628 406051 1 0 3 0x80 kqread dhcpleased 34735 385069 0 0 3 0x14200 bored smr 47165 202033 0 0 2 0x14200 zerothread 32626 314272 0 0 3 0x14200 aiodoned aiodoned 15102 231745 0 0 3 0x14200 syncer update 35969 445356 0 0 3 0x14200 cleaner cleaner 23382 379348 0 0 3 0x14200 reaper reaper 7592 38325 0 0 3 0x14200 pgdaemon pagedaemon 60545 511229 0 0 3 0x14200 bored viomb 45396 27492 0 0 3 0x40014200 acpi0 acpi0 83544 484351 0 0 3 0x14200 bored softnet0 41546 89130 0 0 3 0x14200 bored systqmp 22205 251809 0 0 3 0x14200 bored systq 71398 201337 0 0 3 0x40014200 tmoslp softclock 24592 130325 0 0 3 0x40014200 idle0 1 497659 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 11042 12114K 12362K 166960K 12173 0 pcb 18 12K 12K 166960K 30 0 rtable 213 6K 6K 166960K 367 0 pf 33 13K 13K 166960K 33 0 ifaddr 39 6K 7K 166960K 45 0 ifgroup 54 2K 2K 166960K 54 0 sysctl 1 1K 9K 166960K 5 0 counters 34 17K 17K 166960K 34 0 ioctlops 0 0K 2K 166960K 38 0 iov 0 0K 16K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1296 82K 82K 166960K 1390 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 85K 166960K 185 0 sigio 0 0K 0K 166960K 2 0 proc 59 59K 83K 166960K 497 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 3 0 in_multi 87 6K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 3 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 370 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 233 153K 158K 166960K 3367 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 38 76K 91K 166960K 1285 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 12 0K 2K 166960K 28 0 temp 40 9106K 9170K 166960K 6029 0 kqueue 14 22K 24K 166960K 37 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 136 111 0 16 4 0 4 4 0 8 0 unpcb 144 73 0 56 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 22 0 13 1 0 1 1 0 8 0 arp 96 18 0 4 1 0 1 1 0 8 0 inpcb 328 99 0 87 2 0 2 2 0 8 0 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 3 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 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 128 1 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 256 453 0 48 29 0 29 29 0 8 1 art_table 40 454 0 48 5 0 5 5 0 8 0 art_node 32 111 0 25 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 72 2 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1644 0 182 92 0 92 92 0 8 0 ffsino 256 1644 0 182 92 0 92 92 0 8 0 nchpl 144 1917 0 215 64 0 64 64 0 8 0 vnodes 216 1748 0 0 98 0 98 98 0 8 0 namei 1024 5948 0 5948 2 0 2 2 0 8 2 kstatmem 264 25 0 0 2 0 2 2 0 8 0 scxspl 216 6405 0 6405 3 0 3 3 1 8 3 plimitpl 152 102 0 83 1 0 1 1 0 8 0 sigapl 424 480 0 437 6 0 6 6 0 8 1 knotepl 120 12587 0 12538 8 0 8 8 0 8 6 kqueuepl 184 34 0 23 1 0 1 1 0 8 0 pipepl 304 124 0 96 3 0 3 3 0 8 0 fdescpl 448 467 0 438 4 0 4 4 0 8 0 filepl 120 1883 0 1659 7 0 7 7 0 8 0 lockfpl 104 94 0 91 1 0 1 1 0 8 0 lockfspl 48 16 0 13 1 0 1 1 0 8 0 sessionpl 144 25 0 17 1 0 1 1 0 8 0 pgrppl 48 33 0 17 1 0 1 1 0 8 0 ucredpl 104 132 0 118 1 0 1 1 0 8 0 zombiepl 144 438 0 437 1 0 1 1 0 8 0 processpl 1152 480 0 437 4 0 4 4 0 8 0 procpl 664 567 0 511 5 0 5 5 0 8 0 sockpl 552 213 0 180 3 0 3 3 0 8 0 mcl64k 65536 5 0 5 1 0 1 1 0 8 1 mcl8k 8192 4 0 4 1 0 1 1 0 8 1 mcl4k 4096 2549 0 2495 13 0 13 13 0 8 5 mcl2k 2048 177 0 176 1 0 1 1 0 8 0 mtagpl 96 4 0 4 1 0 1 1 0 8 1 mbufpl 256 4705 0 4573 10 0 10 10 0 8 0 bufpl 280 4836 0 102 339 0 339 339 0 8 0 anonpl 24 90678 0 82668 49 0 49 49 0 186 0 amapchunkpl 152 10069 0 9297 30 0 30 30 0 158 0 amappl16 200 1352 0 1328 4 0 4 4 0 8 2 amappl15 192 4 0 3 1 0 1 1 0 8 0 amappl14 184 415 0 414 1 0 1 1 0 8 0 amappl13 176 119 0 109 1 0 1 1 0 8 0 amappl12 168 703 0 674 2 0 2 2 0 8 0 amappl11 160 20 0 20 1 0 1 1 0 8 1 amappl10 152 96 0 86 1 0 1 1 0 8 0 amappl9 144 323 0 323 1 0 1 1 0 8 1 amappl8 136 94 0 93 1 0 1 1 0 8 0 amappl7 128 147 0 135 1 0 1 1 0 8 0 amappl6 120 148 0 147 1 0 1 1 0 8 0 amappl5 112 90 0 83 1 0 1 1 0 8 0 amappl4 104 267 0 249 1 0 1 1 0 8 0 amappl3 96 1788 0 1670 3 0 3 3 0 8 0 amappl2 88 524 0 470 2 0 2 2 0 8 0 amappl1 80 10338 0 9781 13 0 13 13 0 8 1 amappl 88 2676 0 2507 4 0 4 4 0 92 0 uvmvnodes 80 102 0 0 3 0 3 3 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 24 467 0 437 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 467 0 437 1 0 1 1 0 8 0 vmmpekpl 168 5712 0 5677 2 0 2 2 0 8 0 vmmpepl 168 38883 0 37057 80 0 80 80 0 357 0 vmsppl 368 466 0 437 4 0 4 4 0 8 1 rwobjpl 40 14175 0 13212 11 0 11 11 0 8 1 pdppl 4096 940 0 874 90 20 70 76 0 8 4 pvpl 32 239817 0 211025 233 0 233 233 0 265 0 pmappl 216 466 0 437 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 348 0 20 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(ffffffff8348466c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834beea1,ffffffff834a7470,4e2,ffffffff83415bf2) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80078d7180) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800b5785d8,78c8ebde000,78c8ebdf000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800b5785d8,fffffd806b749a40,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7374c8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7374c8,ffff8000328bdee0,ffff8000328bde30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000328bdee0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000328bdee0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a9e15f64400, 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(ffffffff8348466c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834beea1,ffffffff834a7470,4e2,ffffffff83415bf2) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80078d7180) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800b5785d8,78c8ebde000,78c8ebdf000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800b5785d8,fffffd806b749a40,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800b5785d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a7374c8,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7374c8,ffff8000328bdee0,ffff8000328bde30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000328bdee0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000328bdee0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a9e15f64400, count: -11