panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1275 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 8615 8982 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82549ba1) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bb37d,ffffffff8256e1c4,4fb,ffffffff8256e1f7) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d2fd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd8068eecbb8,d8cff91000,d8d0190000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068eecbb8,fffffd8067d83810,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068eecbb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15e sys/kern/kern_exit.c:462 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 1275 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82549ba1) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bb37d,ffffffff8256e1c4,4fb,ffffffff8256e1f7) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d2fd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd8068eecbb8,d8cff91000,d8d0190000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068eecbb8,fffffd8067d83810,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068eecbb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000215bdd90 rbx 0xfffffd8005d2fd00 rdx 0 rcx 0 rax 0xffff8000ffffefc0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x495c50a7f3d6dfb9 r11 0xdbd991f33ce5fce r12 0 r13 0xffffffff82745558 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff824402d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000215bdd80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=8615 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffe540,0xffff8000fffff510 process=0xffff8000ffffa7d8 user=0xffff8000215b9000, vmspace=0xffffffff82981300 estcpu=36, cpticks=37, pctcpu=17.75 user=0, sys=361, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 11800 475636 94105 0 3 0x82 wait syz-executor.4 97847 238264 94105 0 3 0x82 wait syz-executor.7 5332 118521 94105 0 3 0x82 wait syz-executor.0 79011 94159 0 0 3 0x14200 bored sosplice 10780 93698 94105 0 3 0x82 wait syz-executor.5 15832 74781 94105 0 3 0x82 wait syz-executor.3 56384 232820 94105 0 3 0x82 wait syz-executor.2 50255 425131 94105 0 3 0x82 wait syz-executor.1 94105 20980 82156 0 2 0x2 syz-fuzzer 94105 259359 82156 0 2 0x4000482 syz-fuzzer 94105 306640 82156 0 3 0x4000082 thrsleep syz-fuzzer 94105 259361 82156 0 3 0x4000082 thrsleep syz-fuzzer 94105 35187 82156 0 3 0x4000082 thrsleep syz-fuzzer 94105 427787 82156 0 3 0x4000082 thrsleep syz-fuzzer 94105 357981 82156 0 3 0x4000082 thrsleep syz-fuzzer 94105 430249 82156 0 3 0x4000082 thrsleep syz-fuzzer 94105 19492 82156 0 3 0x4000082 thrsleep syz-fuzzer 82156 423564 22029 0 3 0x10008a sigsusp ksh 22029 342844 41026 0 3 0x9a poll sshd 17916 62811 1 0 3 0x100083 ttyin getty 41026 236804 1 0 3 0x88 poll sshd 37031 341948 79832 73 2 0x100010 syslogd 79832 347035 1 0 3 0x100082 netio syslogd 51452 306038 1 0 3 0x100080 kqread resolvd 62665 49934 66986 77 3 0x100092 kqread dhcpleased 44944 336438 66986 77 3 0x100092 kqread dhcpleased 66986 256503 1 0 3 0x80 kqread dhcpleased 61056 209982 0 0 3 0x14200 bored smr 59422 375750 0 0 2 0x14200 zerothread 62200 187720 0 0 3 0x14200 aiodoned aiodoned 31706 358524 0 0 2 0x14600 update 57402 147981 0 0 3 0x14200 cleaner cleaner * 8982 8615 0 0 7 0x14200 reaper 61452 326732 0 0 3 0x14200 pgdaemon pagedaemon 64012 67359 0 0 3 0x14200 bored viomb 8446 80403 0 0 3 0x40014200 acpi0 acpi0 97553 286401 0 0 3 0x14200 bored softnet 64292 351775 0 0 2 0x14200 systqmp 81659 279369 0 0 3 0x14200 bored systq 11482 464961 0 0 2 0x40014200 softclock 20344 180618 0 0 3 0x40014200 idle0 1 291830 0 0 3 0x82 wait init 0 0 -1 0 2 0x10200 swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10172 6402K 6789K 78643K 13459 0 pcb 13 14K 16K 78643K 198 0 rtable 211 8K 11K 78643K 1676 0 ifaddr 70 15K 18K 78643K 575 0 sysctl 2 0K 0K 78643K 2 0 counters 25 17K 17K 78643K 45 0 ioctlops 0 0K 4K 78643K 225 0 iov 0 0K 32K 78643K 449 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1336 83K 84K 78643K 2295 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 16 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 220 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 9 29K 85K 78643K 1492 0 sigio 0 0K 0K 78643K 105 0 proc 58 55K 79K 78643K 773 0 subproc 91 5K 6K 78643K 221 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 57 0 in_multi 77 5K 6K 78643K 256 0 ether_multi 1 0K 0K 78643K 14 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 181 811K 811K 78643K 181 0 exec 0 0K 2K 78643K 1034 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 331 168K 182K 78643K 19068 0 UVM aobj 15 6K 6K 78643K 18 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 75 0 NDP 9 0K 2K 78643K 68 0 temp 118 4692K 4757K 78643K 17976 0 kqueue 10 14K 18K 78643K 98 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 89 0 86 1 0 1 1 0 8 0 rtentry 112 219 0 129 4 0 4 4 0 8 0 unpcb 136 860 0 847 9 8 1 5 0 8 0 syncache 296 22 0 22 3 3 0 1 0 8 0 tcpqe 32 6 0 6 1 1 0 1 0 8 0 tcpcb 736 549 0 545 14 13 1 8 0 8 0 arp 88 37 0 22 1 0 1 1 0 8 0 inpcb 304 2086 0 2079 20 19 1 12 0 8 0 rttmr 72 3 0 3 1 1 0 1 0 8 0 ip6q 72 6 0 4 2 1 1 1 0 8 0 ip6af 40 10 0 8 2 1 1 1 0 8 0 nd6 48 58 0 39 1 0 1 1 0 8 0 kcovpl 48 17 0 10 1 0 1 1 0 8 0 ppxss 1152 3 0 3 1 1 0 1 0 8 0 pfstscr 40 11 0 10 1 0 1 1 0 8 0 pfrktable 1344 497 0 493 1 0 1 1 0 8 0 pftag 88 7 0 3 1 0 1 1 0 8 0 pfstitem 24 14 0 12 1 0 1 1 0 8 0 pfstkey 112 16 0 14 1 0 1 1 0 8 0 pfstate 320 8 0 7 1 0 1 1 0 8 0 pfrule 1360 112 0 99 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 891 0 513 31 2 29 31 0 8 1 art_table 32 892 0 513 4 0 4 4 0 8 0 art_node 16 218 0 136 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 218 0 208 1 0 1 1 0 8 0 shmpl 112 15 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3305 0 1878 90 0 90 90 0 8 0 ffsino 240 3305 0 1878 85 0 85 85 0 8 0 nchpl 144 5496 0 3889 63 0 63 63 0 8 0 uvmvnodes 80 4072 0 0 84 0 84 84 0 8 0 vnodes 224 4072 0 0 240 0 240 240 0 8 0 namei 1024 20102 0 20101 3 2 1 2 0 8 0 vcpupl 1984 5 0 0 1 0 1 1 0 8 0 vmpool 528 5 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 161 0 159 1 0 1 1 0 8 0 scxspl 216 16638 0 16638 9 8 1 8 0 8 1 plimitpl 152 195 0 181 1 0 1 1 0 8 0 sigapl 424 1756 0 1722 6 1 5 6 0 8 0 futexpl 64 14368 0 14368 3 2 1 1 0 8 1 knotepl 112 1332 0 1264 4 0 4 4 0 8 0 kqueuepl 184 1240 0 1222 15 12 3 6 0 8 2 pipepl 304 485 0 460 13 10 3 8 0 8 0 fdescpl 432 1742 0 1722 5 1 4 4 0 8 1 filepl 120 13265 0 13052 23 14 9 15 0 8 1 lockfpl 104 443 0 441 2 1 1 2 0 8 0 lockfspl 48 150 0 148 1 0 1 1 0 8 0 sessionpl 144 32 0 16 1 0 1 1 0 8 0 pgrppl 48 38 0 22 1 0 1 1 0 8 0 ucredpl 96 2014 0 2004 1 0 1 1 0 8 0 zombiepl 144 1722 0 1714 1 0 1 1 0 8 0 processpl 1000 1756 0 1714 6 0 6 6 0 8 0 procpl 672 3780 0 3723 6 1 5 6 0 8 0 sosppl 168 15 0 15 3 3 0 1 0 8 0 sockpl 448 3035 0 3012 49 45 4 26 0 8 1 mcl64k 65536 62 0 62 2 2 0 1 0 8 0 mcl16k 16384 4 0 4 2 2 0 1 0 8 0 mcl12k 12288 50 0 50 5 5 0 1 0 8 0 mcl9k 9216 13 0 13 1 1 0 1 0 8 0 mcl8k 8192 101 0 101 2 2 0 1 0 8 0 mcl4k 4096 153 0 153 4 4 0 1 0 8 0 mcl2k2 2112 11 0 11 3 3 0 1 0 8 0 mcl2k 2048 77831 0 77738 17 4 13 14 0 8 0 mtagpl 96 264 0 203 6 2 4 5 0 8 0 mbufpl 256 136544 0 136150 78 41 37 58 0 8 0 bufpl 288 6707 0 299 458 0 458 458 0 8 0 anonpl 24 484389 0 463938 184 39 145 151 0 188 6 amapchunkpl 152 58755 0 57700 62 21 41 45 0 158 0 amappl16 200 6269 0 5642 67 34 33 45 0 8 0 amappl15 192 223 0 216 1 0 1 1 0 8 0 amappl14 184 95 0 92 1 0 1 1 0 8 0 amappl13 176 162 0 161 1 0 1 1 0 8 0 amappl12 168 27 0 26 2 1 1 1 0 8 0 amappl11 160 53 0 40 1 0 1 1 0 8 0 amappl10 152 853 0 841 1 0 1 1 0 8 0 amappl9 144 517 0 515 1 0 1 1 0 8 0 amappl8 136 933 0 874 3 0 3 3 0 8 0 amappl7 128 320 0 308 1 0 1 1 0 8 0 amappl6 120 278 0 259 2 1 1 2 0 8 0 amappl5 112 2312 0 2287 1 0 1 1 0 8 0 amappl4 104 1010 0 981 2 0 2 2 0 8 0 amappl3 96 319 0 307 1 0 1 1 0 8 0 amappl2 88 666 0 618 3 1 2 3 0 8 0 amappl1 80 33790 0 33218 18 5 13 18 0 8 0 amappl 88 18442 0 18200 8 2 6 7 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 17 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1747 0 1715 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1747 0 1715 1 0 1 1 0 8 0 vmmpekpl 168 16937 0 16901 3 0 3 3 0 8 0 vmmpepl 168 168417 0 165835 160 45 115 155 0 357 1 vmsppl 272 1746 0 1714 5 2 3 3 0 8 0 rwobjpl 24 45097 0 39428 35 0 35 35 0 8 0 pdppl 4096 3500 0 3433 170 103 67 74 0 8 0 pvpl 32 977834 0 957471 318 57 261 269 0 265 53 pmappl 216 1746 0 1714 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1019 0 224 24 0 24 24 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:440 panic(ffffffff82549ba1) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bb37d,ffffffff8256e1c4,4fb,ffffffff8256e1f7) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d2fd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd8068eecbb8,d8cff91000,d8d0190000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068eecbb8,fffffd8067d83810,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068eecbb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15e sys/kern/kern_exit.c:462 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:440 panic(ffffffff82549ba1) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bb37d,ffffffff8256e1c4,4fb,ffffffff8256e1f7) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d2fd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd8068eecbb8,d8cff91000,d8d0190000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068eecbb8,fffffd8067d83810,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068eecbb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068eecbb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9