panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1252 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 8590 55802 0 0x2 0x4000000 1 syz-fuzzer *456954 69823 0 0x14000 0x200 0K reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259b200) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff826125fa,ffffffff8258b71a,4e4,ffffffff825c1ad0) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8006bb1320) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1252 uvm_fault_unwire_locked(fffffd80691f4170,dc3b0d4a000,dc3b0f49000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd80691f4170,fffffd806aa732a0,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136 uvm_map_teardown(fffffd80691f4170) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80691f4170) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd80691f4170) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3684 reaper(ffff800021243508) at reaper+0x19a sys/kern/kern_exit.c:454 end trace frame: 0x0, count: 6 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 "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1252 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259b200) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff826125fa,ffffffff8258b71a,4e4,ffffffff825c1ad0) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8006bb1320) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1252 uvm_fault_unwire_locked(fffffd80691f4170,dc3b0d4a000,dc3b0f49000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd80691f4170,fffffd806aa732a0,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136 uvm_map_teardown(fffffd80691f4170) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80691f4170) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd80691f4170) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3684 reaper(ffff800021243508) at reaper+0x19a sys/kern/kern_exit.c:454 end trace frame: 0x0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800021248f70 rbx 0xffffffff829d0bb7 cpu_info_full_primary+0x2bb7 rdx 0 rcx 0 rax 0xffff800021243508 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8cb8c09835f8c421 r11 0xa31778b2612b31b2 r12 0xffffffff829d09b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff81baa008 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021248f60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (reaper) pid=456954 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021243ce8,0xffff800021243278 process=0xffff8000ffffe568 user=0xffff800021244000, vmspace=0xffffffff82a51a60 estcpu=36, cpticks=47, pctcpu=9.90 user=0, sys=3, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85528 10775 1 0 3 0x100083 ttyin getty 71393 323184 55802 0 3 0x82 wait syz-executor.0 79893 513576 55802 0 3 0x82 wait syz-executor.4 68683 195795 55802 0 3 0x82 wait syz-executor.7 79098 254684 55802 0 3 0x82 wait syz-executor.5 36281 345680 55802 0 3 0x82 wait syz-executor.3 34636 312617 0 0 3 0x14200 acct acct 11609 81712 55802 0 3 0x82 wait syz-executor.2 1604 97163 0 0 3 0x14280 nfsidl nfsio 12046 321781 0 0 3 0x14280 nfsidl nfsio 42788 293330 0 0 3 0x14280 nfsidl nfsio 70854 251357 0 0 3 0x14280 nfsidl nfsio 60565 249663 0 0 3 0x14280 nfsidl nfsio 44574 155692 0 0 3 0x14280 nfsidl nfsio 48854 211493 0 0 3 0x14280 nfsidl nfsio 2070 324569 0 0 3 0x14280 nfsidl nfsio 23775 505710 0 0 3 0x14280 nfsidl nfsio 91116 178866 0 0 3 0x14280 nfsidl nfsio 36218 486555 0 0 3 0x14280 nfsidl nfsio 50735 129360 0 0 3 0x14280 nfsidl nfsio 54677 51821 0 0 3 0x14280 nfsidl nfsio 84667 407078 0 0 3 0x14280 nfsidl nfsio 76268 188075 0 0 3 0x14280 nfsidl nfsio 31444 416476 0 0 3 0x14280 nfsidl nfsio 29238 188265 0 0 3 0x14280 nfsidl nfsio 865 165165 0 0 3 0x14280 nfsidl nfsio 35986 350066 0 0 3 0x14280 nfsidl nfsio 75906 76936 0 0 3 0x14280 nfsidl nfsio 65550 166331 0 0 3 0x14200 bored sosplice 92022 431436 55802 0 3 0x82 wait syz-executor.6 55802 143808 16099 0 3 0x82 thrsleep syz-fuzzer 55802 512982 16099 0 2 0x4000482 syz-fuzzer 55802 6742 16099 0 3 0x4000082 thrsleep syz-fuzzer 55802 41709 16099 0 3 0x4000082 kqread syz-fuzzer 55802 263187 16099 0 3 0x4000082 thrsleep syz-fuzzer 55802 8590 16099 0 7 0x4000002 syz-fuzzer 55802 236739 16099 0 3 0x4000082 thrsleep syz-fuzzer 55802 437107 16099 0 3 0x4000082 thrsleep syz-fuzzer 55802 490194 16099 0 3 0x4000082 thrsleep syz-fuzzer 16099 1849 22044 0 3 0x10008a sigsusp ksh 22044 210700 53765 0 3 0x9a kqread sshd 53765 215969 1 0 3 0x88 kqread sshd 17212 263662 86632 74 3 0x1100092 bpf pflogd 86632 41390 1 0 3 0x80 netio pflogd 40557 39354 96201 73 2 0x1100010 syslogd 96201 279892 1 0 3 0x100082 netio syslogd 13217 252773 1 0 3 0x100080 kqread resolvd 45631 377873 78100 77 3 0x100092 kqread dhcpleased 9115 501071 78100 77 3 0x100092 kqread dhcpleased 78100 208548 1 0 3 0x80 kqread dhcpleased 81679 39027 0 0 3 0x14200 bored smr 26631 88598 0 0 2 0x14200 zerothread 2871 300382 0 0 3 0x14200 aiodoned aiodoned 42711 481628 0 0 3 0x14200 syncer update 89730 93456 0 0 3 0x14200 cleaner cleaner *69823 456954 0 0 7 0x14200 reaper 79907 166606 0 0 3 0x14200 pgdaemon pagedaemon 28506 337932 0 0 3 0x14200 bored viomb 25411 265037 0 0 3 0x40014200 acpi0 acpi0 82915 490397 0 0 3 0x40014200 idle1 49772 347984 0 0 3 0x14200 bored softnet 79808 391023 0 0 3 0x14200 bored softnet 57288 309976 0 0 3 0x14200 bored softnet 91657 499214 0 0 3 0x14200 bored softnet 73940 267454 0 0 3 0x14200 bored systqmp 75572 413239 0 0 3 0x14200 bored systq 55361 486536 0 0 2 0x40014200 softclock 69273 227807 0 0 3 0x40014200 idle0 1 510300 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 10215 6498K 6897K 78643K 16544 0 pcb 13 16K 18K 78643K 408 0 rtable 210 8K 12K 78643K 1965 0 ifaddr 86 19K 22K 78643K 706 0 sysctl 2 0K 2K 78643K 7 0 counters 54 35K 36K 78643K 184 0 ioctlops 0 0K 4K 78643K 3263 0 iov 0 0K 24K 78643K 3229 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1330 83K 84K 78643K 6956 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 97 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 391 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 9 29K 93K 78643K 11792 0 sigio 0 0K 0K 78643K 46 0 proc 71 91K 140K 78643K 1489 0 subproc 91 5K 6K 78643K 442 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 83 0 in_multi 80 5K 6K 78643K 451 0 ether_multi 1 0K 0K 78643K 12 0 mrt 1 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 241 1076K 1076K 78643K 241 0 exec 0 0K 2K 78643K 1700 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 470 597K 597K 78643K 67757 0 UVM aobj 131 8K 8K 78643K 143 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 97 0 NDP 12 0K 1K 78643K 148 0 temp 145 4758K 5778K 78643K 90796 0 kqueue 12 18K 22K 78643K 602 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 282 0 279 5 4 1 3 0 8 0 rtentry 112 461 0 369 4 0 4 4 0 8 0 unpcb 144 2330 0 2315 34 33 1 6 0 8 0 syncache 296 17 0 17 6 6 0 1 0 8 0 tcpqe 32 5 0 5 2 2 0 1 0 8 0 tcpcb 736 1977 0 1973 77 75 2 23 0 8 1 arp 120 71 0 57 1 0 1 1 0 8 0 inpcb 320 4621 0 4614 114 112 2 18 0 8 1 nd6 48 124 0 95 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 2 0 1 0 8 0 kcovpl 48 34 0 27 1 0 1 1 0 8 0 ppxss 1256 17 0 17 3 3 0 1 0 8 0 pfstscr 40 73 0 73 3 3 0 1 0 8 0 pffrag 232 19 0 19 2 2 0 1 0 482 0 pffrnode 88 19 0 19 2 2 0 1 0 8 0 pffrent 40 148 0 148 2 2 0 1 0 8 0 pfosfp 40 1441 0 1440 7 6 1 5 0 8 0 pfosfpen 112 1441 0 1440 23 22 1 21 0 8 0 pfrktable 1344 298 0 295 5 4 1 1 0 8 0 pftag 88 4 0 0 1 0 1 1 0 8 0 pfqueue 264 1 0 1 1 1 0 1 0 8 0 pfstitem 24 34 0 32 1 0 1 1 0 8 0 pfstkey 120 178 0 176 1 0 1 1 0 8 0 pfstate 336 105 0 103 3 2 1 3 0 8 0 pfsrctr 152 269 0 269 1 1 0 1 0 8 0 pfrule 1360 265 0 245 5 3 2 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2076 0 1638 38 7 31 33 0 8 0 art_table 32 2077 0 1638 5 0 5 5 0 8 0 art_node 16 456 0 373 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semapl 112 389 0 379 1 0 1 1 0 8 0 shmpl 112 140 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 18649 0 17195 92 0 92 92 0 8 0 ffsino 272 18649 0 17195 98 0 98 98 0 8 0 nchpl 144 32984 0 31340 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 105678 0 105678 2 1 1 2 0 8 1 percpumem 16 104 0 65 1 0 1 1 0 8 0 vcpupl 2048 37 0 0 5 0 5 5 0 8 0 vmpool 568 52 0 15 3 0 3 3 0 8 0 pfiaddrpl 120 88 0 83 4 3 1 1 0 8 0 kstatmem 264 154 0 130 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 80752 0 80752 13 12 1 8 0 8 1 plimitpl 152 664 0 648 1 0 1 1 0 8 0 sigapl 424 12068 0 11999 9 1 8 8 0 8 0 futexpl 64 73988 0 73988 1 0 1 1 0 8 1 knotepl 120 500 0 0 13 2 11 12 0 8 0 kqueuepl 224 1300 0 1292 17 16 1 5 0 8 0 pipepl 336 1133 0 1108 24 21 3 8 0 8 0 fdescpl 496 12029 0 12007 5 1 4 5 0 8 0 filepl 152 58610 0 58392 91 77 14 21 0 8 4 lockfpl 104 4637 0 4635 11 10 1 3 0 8 0 lockfspl 48 1203 0 1201 1 0 1 1 0 8 0 sessionpl 144 51 0 34 1 0 1 1 0 8 0 pgrppl 48 121 0 104 1 0 1 1 0 8 0 ucredpl 104 23046 0 23034 1 0 1 1 0 8 0 zombiepl 144 12007 0 11999 1 0 1 1 0 8 0 processpl 1064 12068 0 11999 5 0 5 5 0 8 0 procpl 672 31076 0 30976 23 14 9 10 0 8 0 srpgc 96 44 0 44 5 5 0 1 0 8 0 sosppl 168 25 0 25 5 5 0 1 0 8 0 sockpl 504 7244 0 7215 195 189 6 29 0 8 1 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 213 0 0 20 1 19 20 0 8 0 mtagpl 96 452 0 0 8 0 8 8 0 8 0 mbufpl 256 791 0 0 36 1 35 35 0 8 0 bufpl 288 17574 0 11241 453 0 453 453 0 8 0 anonpl 24 2119082 0 2092950 230 60 170 170 0 186 0 amapchunkpl 152 202338 0 201024 69 18 51 51 0 158 0 amappl16 200 26195 0 25459 79 38 41 49 0 8 0 amappl15 192 1889 0 1886 2 1 1 1 0 8 0 amappl14 184 2814 0 2804 1 0 1 1 0 8 0 amappl13 176 2549 0 2545 1 0 1 1 0 8 0 amappl12 168 38 0 33 1 0 1 1 0 8 0 amappl11 160 642 0 621 1 0 1 1 0 8 0 amappl10 152 98 0 93 1 0 1 1 0 8 0 amappl9 144 4026 0 4018 1 0 1 1 0 8 0 amappl8 136 3478 0 3350 6 1 5 5 0 8 0 amappl7 128 2396 0 2381 1 0 1 1 0 8 0 amappl6 120 3846 0 3815 4 3 1 2 0 8 0 amappl5 112 7983 0 7966 1 0 1 1 0 8 0 amappl4 104 4081 0 4048 3 2 1 3 0 8 0 amappl3 96 36463 0 36389 2 0 2 2 0 8 0 amappl2 88 14986 0 14919 4 1 3 3 0 8 0 amappl1 80 282978 0 282245 21 6 15 20 0 8 0 amappl 88 65956 0 65701 6 0 6 6 0 92 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 128 253 0 253 1 1 0 1 0 8 0 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 72 142 0 12 3 0 3 3 0 8 0 uaddrrnd 24 12081 0 12015 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12081 0 12015 1 0 1 1 0 8 0 vmmpekpl 168 82134 0 82059 4 0 4 4 0 8 0 vmmpepl 168 1148467 0 1145342 241 105 136 169 0 357 0 vmsppl 368 12080 0 12014 8 1 7 7 0 8 0 rwobjpl 56 276066 0 268030 120 6 114 115 0 8 0 pdppl 4096 24169 0 24065 504 400 104 106 0 8 0 pvpl 32 4194242 0 4158797 479 159 320 320 0 265 16 pmappl 248 12080 0 12014 6 1 5 5 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1582 0 706 26 0 26 26 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259b200) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff826125fa,ffffffff8258b71a,4e4,ffffffff825c1ad0) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8006bb1320) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1252 uvm_fault_unwire_locked(fffffd80691f4170,dc3b0d4a000,dc3b0f49000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd80691f4170,fffffd806aa732a0,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136 uvm_map_teardown(fffffd80691f4170) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80691f4170) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd80691f4170) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3684 reaper(ffff800021243508) at reaper+0x19a sys/kern/kern_exit.c:454 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020de8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800021342b40) at syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] syscall(ffff800021342b40) at syscall+0x41d sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2ee167c70, count: 9 ddb{1}> trace x86_ipi_db(ffff800020de8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800021342b40) at syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] syscall(ffff800021342b40) at syscall+0x41d sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2ee167c70, count: -6