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 *201962 62221 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82577366) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eb385,ffffffff8259ffbb,4f5,ffffffff8259ffee) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd80064bd080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8078ae2558,266feeef000,266ff0ee000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd8078ae2558,fffffd807905c7e8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd8078ae2558) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 reaper(ffff8000ffff9268) 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(ffffffff82577366) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eb385,ffffffff8259ffbb,4f5,ffffffff8259ffee) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd80064bd080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8078ae2558,266feeef000,266ff0ee000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd8078ae2558,fffffd807905c7e8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd8078ae2558) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 reaper(ffff8000ffff9268) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000216c0770 rbx 0xfffffd80064bd080 rdx 0 rcx 0 rax 0xffff8000ffff9268 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb7c25595ef194a76 r11 0x2e165cdabaedc12 r12 0 r13 0xffff8000216c0898 r14 0 r15 0x1 rip 0xffffffff81e6cb38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216c0760 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=201962 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffffce0,0xffff8000ffff8d38 process=0xffff8000ffffa7d8 user=0xffff8000216bb000, vmspace=0xffffffff82a492c8 estcpu=36, cpticks=27, pctcpu=20.15 user=0, sys=369, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 10978 415371 0 0 3 0x14280 nfsidl nfsio 92024 489413 0 0 3 0x14280 nfsidl nfsio 15128 371660 0 0 3 0x14280 nfsidl nfsio 48622 39263 0 0 3 0x14280 nfsidl nfsio 24051 26690 0 0 3 0x14280 nfsidl nfsio 50157 329471 0 0 3 0x14280 nfsidl nfsio 33111 308096 0 0 3 0x14280 nfsidl nfsio 71853 305664 0 0 3 0x14280 nfsidl nfsio 80508 317694 0 0 3 0x14280 nfsidl nfsio 32244 480009 0 0 3 0x14280 nfsidl nfsio 30590 349069 0 0 3 0x14280 nfsidl nfsio 11125 244857 0 0 3 0x14280 nfsidl nfsio 54025 260658 0 0 3 0x14280 nfsidl nfsio 54944 223643 0 0 3 0x14280 nfsidl nfsio 5762 68599 0 0 3 0x14280 nfsidl nfsio 14477 511958 0 0 3 0x14280 nfsidl nfsio 38284 206076 0 0 3 0x14280 nfsidl nfsio 72684 197538 0 0 3 0x14280 nfsidl nfsio 3438 359915 0 0 3 0x14280 nfsidl nfsio 22948 120613 0 0 3 0x14280 nfsidl nfsio 78647 253892 0 0 3 0x14200 bored sosplice 66830 273241 7807 0 3 0x82 piperd syz-executor.6 22214 336351 7807 0 3 0x82 piperd syz-executor.5 51797 365934 7807 0 3 0x82 piperd syz-executor.7 73462 105443 7807 0 3 0x82 piperd syz-executor.1 54106 78459 7807 0 3 0x82 piperd syz-executor.0 7807 92630 49177 0 3 0x82 thrsleep syz-fuzzer 7807 109193 49177 0 2 0x4000482 syz-fuzzer 7807 158330 49177 0 3 0x4000082 wait syz-fuzzer 7807 134581 49177 0 3 0x4000082 wait syz-fuzzer 7807 350264 49177 0 3 0x4000082 thrsleep syz-fuzzer 7807 451440 49177 0 3 0x4000082 thrsleep syz-fuzzer 7807 341548 49177 0 3 0x4000082 thrsleep syz-fuzzer 7807 56106 49177 0 3 0x4000082 thrsleep syz-fuzzer 7807 475111 49177 0 2 0x4000002 syz-fuzzer 7807 420631 49177 0 3 0x4000082 wait syz-fuzzer 7807 285793 49177 0 3 0x4000082 wait syz-fuzzer 7807 514695 49177 0 3 0x4000082 wait syz-fuzzer 7807 435731 49177 0 3 0x4000082 thrsleep syz-fuzzer 7807 462044 49177 0 3 0x4000082 thrsleep syz-fuzzer 7807 288386 49177 0 3 0x4000082 thrsleep syz-fuzzer 49177 66325 37635 0 3 0x10008a sigsusp ksh 37635 56636 12440 0 3 0x9a kqread sshd 24280 372729 1 0 3 0x100083 ttyin getty 12440 507537 1 0 3 0x88 kqread sshd 98633 404545 46287 73 2 0x1100010 syslogd 46287 489261 1 0 3 0x100082 netio syslogd 67644 422801 1 0 3 0x100080 kqread resolvd 78758 521204 69543 77 3 0x100092 kqread dhcpleased 8091 308956 69543 77 3 0x100092 kqread dhcpleased 69543 518957 1 0 3 0x80 kqread dhcpleased 36621 174823 0 0 3 0x14200 bored smr 94850 514996 0 0 2 0x14200 zerothread 45326 464564 0 0 3 0x14200 aiodoned aiodoned 13443 214082 0 0 2 0x14600 update 45268 491687 0 0 3 0x14200 cleaner cleaner *62221 201962 0 0 7 0x14200 reaper 91533 79305 0 0 3 0x14200 pgdaemon pagedaemon 55526 69750 0 0 3 0x14200 bored viomb 10223 244616 0 0 3 0x40014200 acpi0 acpi0 66646 107574 0 0 3 0x14200 bored softnet 53204 171800 0 0 3 0x14200 bored softnet 99890 409239 0 0 3 0x14200 bored softnet 11993 77093 0 0 3 0x14200 bored softnet 31087 47068 0 0 2 0x14200 systqmp 69567 456434 0 0 3 0x14200 bored systq 22180 42753 0 0 2 0x40014200 softclock 47337 521879 0 0 3 0x40014200 idle0 1 230332 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 10165 6395K 7306K 78643K 12563 0 pcb 13 8K 8K 78643K 84 0 rtable 171 5K 7K 78643K 504 0 ifaddr 63 14K 17K 78643K 125 0 counters 24 17K 17K 78643K 32 0 ioctlops 0 0K 4K 78643K 157 0 iov 0 0K 1K 78643K 7 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1274 80K 80K 78643K 1785 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 5 0K 0K 78643K 11 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 7 21K 65K 78643K 1574 0 proc 57 59K 123K 78643K 733 0 subproc 65 4K 6K 78643K 169 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 88 0 in_multi 66 4K 6K 78643K 172 0 ether_multi 1 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 91 413K 413K 78643K 91 0 exec 0 0K 2K 78643K 772 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 62K 78643K 8 0 UVM amap 244 481K 519K 78643K 8943 0 UVM aobj 10 2K 2K 78643K 17 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 94 0 NDP 8 0K 2K 78643K 42 0 temp 103 4713K 4778K 78643K 8581 0 kqueue 12 18K 26K 78643K 141 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 72 0 69 1 0 1 1 0 8 0 rtentry 112 167 0 89 4 0 4 4 0 8 0 unpcb 144 164 0 151 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 26 0 26 4 4 0 1 0 8 0 tcpcb 768 235 0 231 4 3 1 4 0 8 0 arp 88 29 0 16 1 0 1 1 0 8 0 inpcb 320 579 0 567 2 0 2 2 0 8 0 nd6 48 39 0 24 1 0 1 1 0 8 0 kcovpl 48 13 0 8 1 0 1 1 0 8 0 pfstscr 40 24 0 22 1 0 1 1 0 8 0 pfosfp 40 7 0 6 1 0 1 1 0 8 0 pfosfpen 112 7 0 0 1 0 1 1 0 8 0 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfanchor 1280 154 0 116 4 0 4 4 0 8 0 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 120 48 0 44 1 0 1 1 0 8 0 pfstate 336 24 0 22 1 0 1 1 0 8 0 pfrule 1360 13 0 13 2 2 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 681 0 359 34 10 24 29 0 8 0 art_table 32 682 0 359 4 0 4 4 0 8 0 art_node 16 166 0 95 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 40 1 1 0 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 14 0 7 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3412 0 1967 93 1 92 93 0 8 0 ffsino 240 3412 0 1967 87 1 86 87 0 8 0 nchpl 144 5522 0 3890 62 0 62 62 0 8 0 uvmvnodes 80 3894 0 0 80 0 80 80 0 8 0 vnodes 216 3894 0 0 217 0 217 217 0 8 0 namei 1024 16131 0 16131 8 8 0 2 0 8 0 vcpupl 2048 26 0 0 4 0 4 4 0 8 0 vmpool 536 26 0 0 2 0 2 2 0 8 0 kstatmem 264 32 0 16 2 0 2 2 0 8 0 scxspl 216 20778 0 20778 9 8 1 8 0 8 1 plimitpl 152 135 0 123 1 0 1 1 0 8 0 sigapl 424 1871 0 1815 8 1 7 8 0 8 0 futexpl 64 9407 0 9407 5 5 0 1 0 8 0 knotepl 120 18930 0 18856 11 8 3 11 0 8 0 kqueuepl 184 144 0 136 1 0 1 1 0 8 0 pipepl 288 194 0 169 3 1 2 3 0 8 0 fdescpl 432 1834 0 1816 6 3 3 4 0 8 0 filepl 120 6098 0 5915 8 0 8 8 0 8 0 lockfpl 104 386 0 384 1 0 1 1 0 8 0 lockfspl 48 125 0 123 1 0 1 1 0 8 0 sessionpl 144 28 0 14 1 0 1 1 0 8 0 pgrppl 48 28 0 14 1 0 1 1 0 8 0 ucredpl 104 1096 0 1086 1 0 1 1 0 8 0 zombiepl 144 1816 0 1815 1 0 1 1 0 8 0 processpl 1000 1871 0 1815 10 2 8 9 0 8 0 procpl 672 3412 0 3341 9 2 7 8 0 8 0 sosppl 168 22 0 22 1 1 0 1 0 8 0 sockpl 456 815 0 792 8 5 3 5 0 8 0 mcl64k 65536 1 0 1 1 1 0 1 0 8 0 mcl16k 16384 10 0 10 1 1 0 1 0 8 0 mcl9k 9216 7 0 7 1 1 0 1 0 8 0 mcl8k 8192 52 0 52 1 1 0 1 0 8 0 mcl4k 4096 110 0 110 3 3 0 1 0 8 0 mcl2k2 2112 14 0 14 1 1 0 1 0 8 0 mcl2k 2048 11549 0 11474 29 17 12 17 0 8 0 mtagpl 96 134 0 51 5 1 4 4 0 8 0 mbufpl 256 40080 0 39783 29 4 25 27 0 8 0 bufpl 288 10094 0 3690 458 0 458 458 0 8 0 anonpl 24 398077 0 380041 288 31 257 267 0 188 121 amapchunkpl 152 30803 0 29663 119 20 99 107 0 158 52 amappl16 200 3459 0 3314 16 4 12 16 0 8 0 amappl15 192 461 0 453 1 0 1 1 0 8 0 amappl14 184 352 0 345 1 0 1 1 0 8 0 amappl13 176 527 0 524 1 0 1 1 0 8 0 amappl12 168 13 0 8 1 0 1 1 0 8 0 amappl11 160 263 0 249 1 0 1 1 0 8 0 amappl10 152 14 0 12 1 0 1 1 0 8 0 amappl9 144 600 0 597 1 0 1 1 0 8 0 amappl8 136 834 0 777 4 1 3 3 0 8 0 amappl7 128 330 0 311 1 0 1 1 0 8 0 amappl6 120 328 0 318 2 1 1 2 0 8 0 amappl5 112 729 0 718 1 0 1 1 0 8 0 amappl4 104 1437 0 1410 2 1 1 2 0 8 0 amappl3 96 4711 0 4671 2 0 2 2 0 8 0 amappl2 88 888 0 852 2 1 1 2 0 8 0 amappl1 80 44948 0 44437 19 5 14 19 0 8 0 amappl 88 8369 0 8242 4 0 4 4 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 16 0 7 1 0 1 1 0 8 0 uaddrrnd 24 1860 0 1816 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1860 0 1816 1 0 1 1 0 8 0 vmmpekpl 168 15548 0 15492 3 0 3 3 0 8 0 vmmpepl 168 171501 0 169973 107 11 96 105 0 357 0 vmsppl 272 1859 0 1815 5 1 4 4 0 8 0 rwobjpl 24 43895 0 38979 31 0 31 31 0 8 0 pdppl 4096 3726 0 3656 150 74 76 90 0 8 6 pvpl 32 889694 0 869867 645 168 477 506 0 265 264 pmappl 216 1859 0 1815 5 2 3 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 916 0 127 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:437 panic(ffffffff82577366) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eb385,ffffffff8259ffbb,4f5,ffffffff8259ffee) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd80064bd080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8078ae2558,266feeef000,266ff0ee000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd8078ae2558,fffffd807905c7e8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd8078ae2558) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 reaper(ffff8000ffff9268) 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(ffffffff82577366) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eb385,ffffffff8259ffbb,4f5,ffffffff8259ffee) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd80064bd080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8078ae2558,266feeef000,266ff0ee000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd8078ae2558,fffffd807905c7e8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8078ae2558) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd8078ae2558) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 reaper(ffff8000ffff9268) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9