panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1269 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *494083 73693 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257f973) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0a48,ffffffff825a0324,4f5,ffffffff825a0357) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006362780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806ce04560,1f9dc89f000,1f9dca9e000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806ce04560,fffffd8069c67230,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2567 uvmspace_free(fffffd806ce04560) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3491 reaper(ffff8000ffff9a48) at reaper+0x15d sys/kern/kern_exit.c:448 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1269 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257f973) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0a48,ffffffff825a0324,4f5,ffffffff825a0357) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006362780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806ce04560,1f9dc89f000,1f9dca9e000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806ce04560,fffffd8069c67230,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2567 uvmspace_free(fffffd806ce04560) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3491 reaper(ffff8000ffff9a48) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000216c0c00 rbx 0xfffffd8006362780 rdx 0 rcx 0 rax 0xffff8000ffff9a48 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa999878216b999fa r11 0x45a1cf0ee91250fb r12 0 r13 0xffff8000216c0d28 r14 0 r15 0x1 rip 0xffffffff81118f38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216c0bf0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=494083 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffffce0,0xffff8000ffff97b8 process=0xffff8000ffffa3f0 user=0xffff8000216bb000, vmspace=0xffffffff829b6010 estcpu=36, cpticks=67, pctcpu=12.36 user=0, sys=6, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 94290 358403 87532 0 3 0x82 wait syz-executor.3 3503 513736 87532 0 3 0x82 wait syz-executor.6 6538 225333 87532 0 3 0x82 wait syz-executor.5 25573 472711 87532 0 3 0x82 wait syz-executor.2 46198 17371 87532 0 3 0x82 wait syz-executor.4 13268 475014 87532 0 3 0x82 wait syz-executor.1 48191 237416 87532 0 3 0x82 wait syz-executor.0 46060 323273 1 0 3 0x100083 ttyin getty 65109 465633 0 0 3 0x14200 acct acct 73726 371312 0 0 3 0x14200 bored sosplice 56586 113143 0 0 3 0x14280 nfsidl nfsio 7746 256433 0 0 3 0x14280 nfsidl nfsio 96799 46475 0 0 3 0x14280 nfsidl nfsio 65354 511902 0 0 3 0x14280 nfsidl nfsio 83323 347938 0 0 3 0x14280 nfsidl nfsio 50747 431501 0 0 3 0x14280 nfsidl nfsio 94748 408262 0 0 3 0x14280 nfsidl nfsio 8655 343735 0 0 3 0x14280 nfsidl nfsio 9985 5506 0 0 3 0x14280 nfsidl nfsio 30957 20257 0 0 3 0x14280 nfsidl nfsio 94741 362295 0 0 3 0x14280 nfsidl nfsio 55046 272361 0 0 3 0x14280 nfsidl nfsio 28629 303636 0 0 3 0x14280 nfsidl nfsio 63870 444752 0 0 3 0x14280 nfsidl nfsio 51530 198063 0 0 3 0x14280 nfsidl nfsio 74695 251350 0 0 3 0x14280 nfsidl nfsio 39282 385620 0 0 3 0x14280 nfsidl nfsio 94458 80054 0 0 3 0x14280 nfsidl nfsio 20269 233558 0 0 3 0x14280 nfsidl nfsio 44059 189596 0 0 3 0x14280 nfsidl nfsio 87532 347079 54971 0 3 0x82 thrsleep syz-fuzzer 87532 357022 54971 0 2 0x4000482 syz-fuzzer 87532 433652 54971 0 3 0x4000082 wait syz-fuzzer 87532 231142 54971 0 3 0x4000082 wait syz-fuzzer 87532 224339 54971 0 3 0x4000082 thrsleep syz-fuzzer 87532 19580 54971 0 3 0x4000082 thrsleep syz-fuzzer 87532 465636 54971 0 3 0x4000082 wait syz-fuzzer 87532 314505 54971 0 3 0x4000082 wait syz-fuzzer 87532 460539 54971 0 3 0x4000082 thrsleep syz-fuzzer 87532 453259 54971 0 2 0x4000002 syz-fuzzer 87532 473733 54971 0 3 0x4000082 thrsleep syz-fuzzer 87532 43923 54971 0 3 0x4000082 wait syz-fuzzer 87532 323341 54971 0 3 0x4000082 wait syz-fuzzer 87532 113732 54971 0 3 0x4000082 wait syz-fuzzer 87532 487612 54971 0 3 0x4000082 thrsleep syz-fuzzer 54971 52128 37172 0 3 0x10008a sigsusp ksh 37172 47371 98459 0 3 0x9a kqread sshd 98459 11172 1 0 3 0x88 kqread sshd 64717 24571 28667 73 2 0x1100010 syslogd 28667 176133 1 0 3 0x100082 netio syslogd 55128 223936 1 0 3 0x100080 kqread resolvd 66040 189461 4411 77 3 0x100092 kqread dhcpleased 17026 266951 4411 77 3 0x100092 kqread dhcpleased 4411 438111 1 0 3 0x80 kqread dhcpleased 4823 220745 0 0 3 0x14200 bored smr 53446 390866 0 0 2 0x14200 zerothread 90859 410746 0 0 3 0x14200 aiodoned aiodoned 85748 517454 0 0 3 0x14200 syncer update 43040 65252 0 0 3 0x14200 cleaner cleaner *73693 494083 0 0 7 0x14200 reaper 72137 421623 0 0 3 0x14200 pgdaemon pagedaemon 8939 173084 0 0 3 0x14200 bored viomb 84623 210916 0 0 3 0x40014200 acpi0 acpi0 95338 335670 0 0 3 0x14200 bored softnet 31229 424077 0 0 3 0x14200 bored softnet 23670 32315 0 0 3 0x14200 bored softnet 14786 34409 0 0 3 0x14200 bored softnet 7702 53063 0 0 3 0x14200 bored systqmp 30803 260084 0 0 3 0x14200 bored systq 11159 340559 0 0 2 0x40014200 softclock 76878 55787 0 0 3 0x40014200 idle0 1 451343 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 10226 6438K 7353K 78643K 49996 0 pcb 13 18K 20K 78643K 1591 0 rtable 230 18K 23K 78643K 3651 0 ifaddr 152 35K 38K 78643K 1307 0 sysctl 3 1K 3K 78643K 14 0 counters 26 17K 17K 78643K 451 0 ioctlops 0 0K 4K 78643K 2793 0 iov 0 0K 32K 78643K 1755 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1411 88K 88K 78643K 17103 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 106 0 VM map 2 0K 0K 78643K 2 0 sem 21 10K 13K 78643K 770 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 9 29K 69K 78643K 12349 0 sigio 0 0K 0K 78643K 393 0 proc 63 59K 75K 78643K 2319 0 subproc 91 5K 7K 78643K 806 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 482 0 in_multi 88 5K 6K 78643K 953 0 ether_multi 1 0K 0K 78643K 76 0 mrt 1 0K 0K 78643K 55 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 247 1102K 1102K 78643K 247 0 exec 0 0K 1K 78643K 3273 0 pfkey data 0 0K 1K 78643K 6 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 8 62K 64K 78643K 10 0 UVM amap 332 90K 102K 78643K 78950 0 UVM aobj 13 2K 2K 78643K 13 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 339 0 NDP 15 0K 2K 78643K 339 0 temp 141 4730K 5754K 78643K 104822 0 kqueue 12 18K 26K 78643K 1053 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 801 0 798 8 7 1 3 0 8 0 rtentry 112 1085 0 992 6 3 3 4 0 8 0 unpcb 144 9399 0 9386 110 109 1 10 0 8 0 syncache 296 110 0 110 20 20 0 1 0 8 0 tcpqe 32 40 0 40 12 12 0 1 0 8 0 tcpcb 768 4062 0 4058 164 163 1 18 0 8 0 arp 88 206 0 190 1 0 1 1 0 8 0 ipq 40 12 0 12 6 6 0 1 0 8 0 ipqe 40 79 0 79 6 6 0 1 0 8 0 inpcb 336 10453 0 10446 189 188 1 12 0 8 0 ip6q 72 12 0 12 5 5 0 1 0 8 0 ip6af 40 23 0 23 5 5 0 1 0 8 0 nd6 48 202 0 180 1 0 1 1 0 8 0 pkpcb 40 247 0 247 7 7 0 2 0 8 0 kcovpl 48 62 0 55 1 0 1 1 0 8 0 mppekey 1024 39 0 39 2 2 0 1 0 8 0 ppxss 1160 295 0 295 22 22 0 1 0 8 0 pppxif 1608 110 0 110 12 12 0 1 0 8 0 pfstscr 40 70 0 69 2 1 1 1 0 8 0 pfosfp 40 7 0 5 1 0 1 1 0 8 0 pfosfpen 112 7 0 5 1 0 1 1 0 8 0 pfrktable 1344 84 0 81 3 2 1 2 0 8 0 pfanchor 1280 662 2 212 43 2 41 43 0 8 0 pftag 88 17 0 10 1 0 1 1 0 8 0 pfqueue 264 3 0 3 1 1 0 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 120 140 0 138 2 1 1 1 0 8 0 pfstate 336 70 0 69 2 1 1 1 0 8 0 pfrule 1360 137 0 129 6 5 1 3 0 8 0 rttmr 136 10 0 10 3 3 0 1 0 8 0 art_heap8 4096 13 0 12 9 8 1 3 0 8 0 art_heap4 256 4105 0 3701 63 37 26 31 0 8 0 art_table 32 4118 0 3713 4 0 4 4 0 8 0 art_node 16 1079 0 998 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 5 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 758 0 739 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 21754 0 20296 92 0 92 92 0 8 0 ffsino 240 21754 0 20296 87 0 87 87 0 8 0 nchpl 144 38109 0 37557 63 41 22 63 0 8 0 uvmvnodes 80 6140 0 0 126 0 126 126 0 8 0 vnodes 216 6140 0 0 342 0 342 342 0 8 0 namei 1024 152435 0 152434 14 13 1 2 0 8 0 pfiaddrpl 120 44 0 40 2 1 1 1 0 8 0 kstatmem 264 416 0 386 10 7 3 3 0 8 0 scsiplug 72 34 0 34 9 9 0 1 0 8 0 scxspl 216 115164 0 115164 36 35 1 8 0 8 1 plimitpl 152 1859 0 1843 1 0 1 1 0 8 0 sigapl 424 12554 0 12488 8 0 8 8 0 8 0 futexpl 64 135131 0 135131 10 10 0 1 0 8 0 knotepl 120 188353 0 188279 83 80 3 15 0 8 0 kqueuepl 184 2618 0 2610 37 36 1 4 0 8 0 pipepl 288 2252 0 2227 41 38 3 12 0 8 0 fdescpl 432 12511 0 12491 4 0 4 4 0 8 0 filepl 120 106479 0 106266 146 136 10 17 0 8 2 lockfpl 104 12417 0 12415 31 30 1 4 0 8 0 lockfspl 48 5477 0 5475 4 3 1 2 0 8 0 sessionpl 144 76 0 60 1 0 1 1 0 8 0 pgrppl 48 85 0 69 1 0 1 1 0 8 0 ucredpl 104 31282 0 31272 1 0 1 1 0 8 0 zombiepl 144 12496 0 12488 1 0 1 1 0 8 0 processpl 1000 12554 0 12488 10 1 9 9 0 8 0 procpl 672 31411 0 31311 34 25 9 10 0 8 0 sosppl 168 98 0 98 13 13 0 1 0 8 0 sockpl 456 20919 0 20896 557 548 9 41 0 8 6 mcl64k 65536 486 0 486 27 27 0 1 0 8 0 mcl16k 16384 113 0 113 30 30 0 1 0 8 0 mcl12k 12288 406 0 406 30 30 0 1 0 8 0 mcl9k 9216 226 0 226 25 25 0 1 0 8 0 mcl8k 8192 787 0 787 23 23 0 1 0 8 0 mcl4k 4096 1465 0 1465 20 20 0 1 0 8 0 mcl2k2 2112 112 0 112 28 28 0 1 0 8 0 mcl2k 2048 105073 0 105008 32 23 9 13 0 8 0 mtagpl 96 4625 0 4357 31 23 8 15 0 8 0 mbufpl 256 297432 0 296922 1360 1323 37 443 0 8 0 bufpl 288 26121 0 19420 479 0 479 479 0 8 0 anonpl 24 2387920 0 2364177 351 191 160 185 0 188 0 amapchunkpl 152 252907 0 251656 228 178 50 59 0 158 0 amappl16 200 20795 0 20227 141 110 31 44 0 8 0 amappl15 192 7 0 7 4 4 0 1 0 8 0 amappl14 184 353 0 336 2 1 1 2 0 8 0 amappl13 176 11509 0 11493 1 0 1 1 0 8 0 amappl12 168 1027 0 1020 1 0 1 1 0 8 0 amappl11 160 51 0 40 1 0 1 1 0 8 0 amappl10 152 86 0 76 1 0 1 1 0 8 0 amappl9 144 1295 0 1293 1 0 1 1 0 8 0 amappl8 136 603 0 504 4 0 4 4 0 8 0 amappl7 128 92 0 72 1 0 1 1 0 8 0 amappl6 120 829 0 804 2 1 1 2 0 8 0 amappl5 112 264 0 255 1 0 1 1 0 8 0 amappl4 104 1242 0 1218 2 1 1 2 0 8 0 amappl3 96 34915 0 34852 2 0 2 2 0 8 0 amappl2 88 2061 0 2006 3 1 2 3 0 8 0 amappl1 80 277502 0 276763 22 6 16 21 0 8 0 amappl 88 77864 0 77672 5 0 5 5 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 12 0 0 1 0 1 1 0 8 0 uaddrrnd 24 12511 0 12484 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12511 0 12484 1 0 1 1 0 8 0 vmmpekpl 168 88784 0 88728 3 0 3 3 0 8 0 vmmpepl 168 1143377 0 1140571 377 248 129 153 0 357 0 vmsppl 272 12510 0 12483 3 1 2 2 0 8 0 rwobjpl 24 289767 0 281858 49 1 48 48 0 8 0 pdppl 4096 25028 0 24966 826 764 62 66 0 8 0 pvpl 32 4777324 0 4746885 757 430 327 328 0 265 40 pmappl 216 12510 0 12483 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 3311 0 2505 45 20 25 35 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257f973) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0a48,ffffffff825a0324,4f5,ffffffff825a0357) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006362780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806ce04560,1f9dc89f000,1f9dca9e000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806ce04560,fffffd8069c67230,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2567 uvmspace_free(fffffd806ce04560) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3491 reaper(ffff8000ffff9a48) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257f973) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0a48,ffffffff825a0324,4f5,ffffffff825a0357) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006362780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806ce04560,1f9dc89f000,1f9dca9e000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806ce04560,fffffd8069c67230,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806ce04560) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2567 uvmspace_free(fffffd806ce04560) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3491 reaper(ffff8000ffff9a48) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9