panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1269 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *103023 26204 0 0x14000 0x200 0K reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a3104) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261a9e8,ffffffff8259624a,4f5,ffffffff825cc9e5) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8007288640) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8067425b90,4d83dba6000,4d83dba7000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd8067425b90,fffffd80664b1510,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:1888 uvm_map_teardown(fffffd8067425b90) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8067425b90) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd8067425b90) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3436 reaper(ffff800021232d28) at reaper+0x19a 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{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 1269 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a3104) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261a9e8,ffffffff8259624a,4f5,ffffffff825cc9e5) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8007288640) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8067425b90,4d83dba6000,4d83dba7000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd8067425b90,fffffd80664b1510,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:1888 uvm_map_teardown(fffffd8067425b90) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8067425b90) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd8067425b90) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3436 reaper(ffff800021232d28) at reaper+0x19a sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800021238fe0 rbx 0xffffffff829dfb8f cpu_info_full_primary+0x2b8f rdx 0 rcx 0 rax 0xffff800021232d28 r8 0x101010101010101 r9 0x8080808080808080 r10 0x263e8dbe59204de1 r11 0xc908c5b33ccd2f1 r12 0xffffffff829df990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff8220ed58 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021238fd0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (reaper) pid=103023 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021233ce8,0xffff800021232558 process=0xffff8000ffffe990 user=0xffff800021234000, vmspace=0xffffffff82a6d9a8 estcpu=36, cpticks=42, pctcpu=19.41 user=0, sys=3, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 3288 205719 36193 0 3 0x82 nanoslp syz-executor.5 14862 74613 36193 0 3 0x82 wait syz-executor.2 11000 311453 36193 0 3 0x82 wait syz-executor.0 94914 450993 1 0 3 0x100083 ttyin getty 26330 152255 36193 0 3 0x82 wait syz-executor.4 63946 519577 36193 0 3 0x82 wait syz-executor.1 41690 53882 36193 0 3 0x82 wait syz-executor.3 14574 177480 36193 0 3 0x82 wait syz-executor.6 79289 358615 0 0 3 0x14200 acct acct 38448 234463 0 0 3 0x14200 bored sosplice 36193 464200 75547 0 3 0x82 thrsleep syz-fuzzer 36193 422416 75547 0 3 0x4000082 nanoslp syz-fuzzer 36193 500283 75547 0 3 0x4000082 kqread syz-fuzzer 36193 381193 75547 0 3 0x4000082 thrsleep syz-fuzzer 36193 299974 75547 0 3 0x4000082 wait syz-fuzzer 36193 318765 75547 0 3 0x4000082 wait syz-fuzzer 36193 265596 75547 0 3 0x4000082 wait syz-fuzzer 36193 315717 75547 0 3 0x4000082 thrsleep syz-fuzzer 36193 495004 75547 0 3 0x4000082 thrsleep syz-fuzzer 36193 179885 75547 0 3 0x4000082 wait syz-fuzzer 36193 273250 75547 0 2 0x4000002 syz-fuzzer 36193 150955 75547 0 3 0x4000082 wait syz-fuzzer 36193 101986 75547 0 3 0x4000082 thrsleep syz-fuzzer 36193 405306 75547 0 3 0x4000082 wait syz-fuzzer 36193 59014 75547 0 3 0x4000082 wait syz-fuzzer 36193 96091 75547 0 3 0x4000082 thrsleep syz-fuzzer 75547 467710 72903 0 3 0x10008a sigsusp ksh 72903 503400 73350 0 3 0x9a kqread sshd 73350 169079 1 0 3 0x88 kqread sshd 69690 234083 41965 74 3 0x1100092 bpf pflogd 41965 283038 1 0 3 0x80 netio pflogd 55896 50645 95864 73 2 0x1100010 syslogd 95864 82399 1 0 3 0x100082 netio syslogd 38145 507751 1 0 3 0x100080 kqread resolvd 42965 119652 72672 77 3 0x100092 kqread dhcpleased 46307 416680 72672 77 3 0x100092 kqread dhcpleased 72672 510552 1 0 3 0x80 kqread dhcpleased 40181 227798 0 0 3 0x14200 bored smr 41822 96906 0 0 2 0x14200 zerothread 44210 475005 0 0 3 0x14200 aiodoned aiodoned 37520 188982 0 0 3 0x14200 syncer update 61976 437109 0 0 3 0x14200 cleaner cleaner *26204 103023 0 0 7 0x14200 reaper 79151 279279 0 0 3 0x14200 pgdaemon pagedaemon 41233 212928 0 0 3 0x14200 bored viomb 13018 497577 0 0 3 0x40014200 acpi0 acpi0 8928 376832 0 0 7 0x40014200 idle1 84656 397506 0 0 3 0x14200 bored softnet 13771 362565 0 0 3 0x14200 bored softnet 39189 133039 0 0 3 0x14200 bored softnet 81304 4124 0 0 3 0x14200 bored softnet 63438 230659 0 0 3 0x14200 bored systqmp 44666 412177 0 0 3 0x14200 bored systq 83906 205948 0 0 3 0x40014200 bored softclock 9962 28038 0 0 3 0x40014200 idle0 1 247246 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 10219 6495K 7325K 78643K 28811 0 pcb 13 18K 23K 78643K 1349 0 rtable 218 15K 17K 78643K 3967 0 ifaddr 195 47K 48K 78643K 1117 0 sysctl 3 1K 1K 78643K 3 0 counters 54 35K 36K 78643K 362 0 ioctlops 0 0K 4K 78643K 4009 0 iov 0 0K 24K 78643K 1172 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1501 94K 94K 78643K 11538 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 84 0 VM map 2 1K 1K 78643K 2 0 sem 19 3K 6K 78643K 104 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 9 29K 89K 78643K 9431 0 sigio 0 0K 0K 78643K 107 0 proc 70 91K 116K 78643K 3498 0 subproc 91 5K 7K 78643K 1365 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 245 0 in_multi 79 5K 7K 78643K 1362 0 ether_multi 1 0K 0K 78643K 73 0 mrt 1 0K 0K 78643K 46 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 163 731K 731K 78643K 163 0 exec 0 0K 3K 78643K 4491 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 429 656K 665K 78643K 54444 0 UVM aobj 131 5K 5K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 318 0 NDP 14 0K 2K 78643K 373 0 temp 137 4734K 5758K 78643K 1112119 0 kqueue 12 18K 24K 78643K 529 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 120 471 0 468 3 2 1 3 0 8 0 rtentry 112 1371 0 1290 5 2 3 4 0 8 0 unpcb 144 5074 0 5059 79 78 1 10 0 8 0 syncache 296 40 0 40 13 13 0 1 0 8 0 tcpqe 32 362 0 362 5 5 0 1 0 8 0 tcpcb 768 2265 0 2261 104 103 1 15 0 8 0 arp 120 255 0 241 1 0 1 1 0 8 0 inpcb 368 6683 0 6676 224 222 2 16 0 8 1 ip6q 72 2 0 2 2 2 0 1 0 8 0 ip6af 40 4 0 4 2 2 0 1 0 8 0 nd6 48 317 0 299 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 2 0 1 0 8 0 kcovpl 48 105 0 98 1 0 1 1 0 8 0 ppxss 1256 28 0 28 7 7 0 1 0 8 0 pfstscr 40 27 0 18 1 0 1 1 0 8 0 pffrag 232 10 0 10 2 2 0 1 0 482 0 pffrnode 88 10 0 10 2 2 0 1 0 8 0 pffrent 40 29 34 29 2 2 0 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 76 0 64 5 4 1 2 0 8 0 pfanchor 1280 520 7 8 43 0 43 43 0 8 0 pfpktdelay 88 5 0 5 5 5 0 1 0 8 0 pftag 88 13 0 8 1 0 1 1 0 8 0 pfqueue 264 4 0 4 1 1 0 1 0 8 0 pfstitem 24 66 0 54 1 0 1 1 0 8 0 pfstkey 120 89 0 84 2 1 1 2 0 8 0 pfstate 336 76 0 65 4 2 2 4 0 8 0 pfrule 1360 1148 0 1110 4 0 4 4 0 8 0 rttmr 136 12 0 12 4 4 0 1 0 8 0 art_heap8 4096 4 0 2 4 2 2 2 0 8 0 art_heap4 256 5386 0 5019 76 50 26 29 0 8 0 art_table 32 5390 0 5021 4 0 4 4 0 8 0 art_node 16 1365 0 1295 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 2 1 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 91 0 74 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 12293 0 10641 104 0 104 104 0 8 0 ffsino 272 12293 0 10641 111 0 111 111 0 8 0 nchpl 144 23903 0 22264 63 0 63 63 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 uvmvnodes 80 12523 0 0 256 0 256 256 0 8 0 vnodes 216 12523 0 0 696 0 696 696 0 8 0 namei 1024 98976 0 98975 39 38 1 2 0 8 0 percpumem 16 193 0 154 1 0 1 1 0 8 0 vcpupl 2048 101 0 0 13 0 13 13 0 8 0 vmpool 568 101 0 0 8 0 8 8 0 8 0 pfiaddrpl 120 35 0 15 1 0 1 1 0 8 0 kstatmem 264 322 0 294 3 0 3 3 0 8 0 scsiplug 72 7 0 7 2 2 0 1 0 8 0 scxspl 216 217753 0 217753 18 17 1 8 0 8 1 plimitpl 152 2110 0 2094 1 0 1 1 0 8 0 sigapl 424 9555 0 9506 10 4 6 8 0 8 0 futexpl 64 75547 0 75547 46 45 1 1 0 8 1 knotepl 120 973 0 0 10 1 9 9 0 8 0 kqueuepl 216 1424 0 1416 32 27 5 5 0 8 4 pipepl 320 1765 0 1740 42 39 3 8 0 8 0 fdescpl 496 9515 0 9493 8 4 4 5 0 8 0 filepl 152 59843 0 59625 202 185 17 20 0 8 6 lockfpl 104 2277 0 2275 7 6 1 2 0 8 0 lockfspl 48 694 0 692 1 0 1 1 0 8 0 sessionpl 144 121 0 104 1 0 1 1 0 8 0 pgrppl 48 271 0 254 1 0 1 1 0 8 0 ucredpl 104 5052 0 5040 1 0 1 1 0 8 0 zombiepl 144 9514 0 9506 1 0 1 1 0 8 0 processpl 1064 9555 0 9506 5 0 5 5 0 8 0 procpl 672 23833 0 23761 23 16 7 10 0 8 0 srpgc 96 84 0 84 24 24 0 1 0 8 0 sosppl 168 33 0 33 12 12 0 1 0 8 0 sockpl 488 12246 0 12221 434 429 5 34 0 8 1 mcl64k 65536 11 0 0 2 0 2 2 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 434 0 0 52 8 44 52 0 8 0 mtagpl 96 408 0 0 5 2 3 3 0 8 0 mbufpl 256 1755 0 0 66 26 40 66 0 8 0 bufpl 288 29101 0 16525 899 0 899 899 0 8 0 anonpl 24 2658598 0 2630218 471 292 179 185 0 186 0 amapchunkpl 152 273039 0 271514 292 233 59 90 0 158 0 amappl16 200 23589 0 23012 92 59 33 44 0 8 0 amappl15 192 1156 0 1152 2 1 1 1 0 8 0 amappl14 184 924 0 917 1 0 1 1 0 8 0 amappl13 176 1899 0 1895 1 0 1 1 0 8 0 amappl12 168 264 0 262 1 0 1 1 0 8 0 amappl11 160 641 0 617 2 0 2 2 0 8 0 amappl10 152 2190 0 2182 1 0 1 1 0 8 0 amappl9 144 2010 0 1998 1 0 1 1 0 8 0 amappl8 136 3727 0 3622 4 0 4 4 0 8 0 amappl7 128 1927 0 1903 3 2 1 2 0 8 0 amappl6 120 2257 0 2229 2 1 1 2 0 8 0 amappl5 112 8869 0 8847 1 0 1 1 0 8 0 amappl4 104 4324 0 4283 2 0 2 2 0 8 0 amappl3 96 27638 0 27572 2 0 2 2 0 8 0 amappl2 88 10538 0 10459 3 1 2 3 0 8 0 amappl1 80 223915 0 223068 23 5 18 23 0 8 0 amappl 88 52380 0 52140 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 9617 0 9487 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9617 0 9487 1 0 1 1 0 8 0 vmmpekpl 168 72379 0 72303 5 0 5 5 0 8 0 vmmpepl 168 966401 0 963046 539 385 154 192 0 357 1 vmsppl 368 9616 0 9486 12 0 12 12 0 8 0 rwobjpl 56 235148 0 220553 213 7 206 206 0 8 0 pdppl 4096 19241 0 19073 969 801 168 170 0 8 0 pvpl 32 5615095 0 5584393 801 490 311 327 0 265 3 pmappl 248 9616 0 9486 10 1 9 9 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2599 0 1158 42 0 42 42 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(ffffffff825a3104) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261a9e8,ffffffff8259624a,4f5,ffffffff825cc9e5) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8007288640) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8067425b90,4d83dba6000,4d83dba7000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd8067425b90,fffffd80664b1510,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:1888 uvm_map_teardown(fffffd8067425b90) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8067425b90) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd8067425b90) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3436 reaper(ffff800021232d28) at reaper+0x19a sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: -5