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 *256013 47331 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257ca43) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f143f,ffffffff825a25e9,4f5,ffffffff825a261c) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800602da80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680c9bb8,ffcd1127000,ffcd1128000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80680c9bb8,fffffd806a014598,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80680c9bb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3504 reaper(ffff8000ffff9ce8) 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(ffffffff8257ca43) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f143f,ffffffff825a25e9,4f5,ffffffff825a261c) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800602da80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680c9bb8,ffcd1127000,ffcd1128000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80680c9bb8,fffffd806a014598,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80680c9bb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3504 reaper(ffff8000ffff9ce8) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000216c0170 rbx 0xfffffd800602da80 rdx 0 rcx 0 rax 0xffff8000ffff9ce8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2be6484f03da135a r11 0xa3e4e45c03348dc6 r12 0 r13 0xffff8000216c0298 r14 0 r15 0x1 rip 0xffffffff811b3478 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216c0160 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=256013 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffff7a0,0xffff8000ffff9278 process=0xffff8000ffffa008 user=0xffff8000216bb000, vmspace=0xffffffff82a16c10 estcpu=36, cpticks=75, pctcpu=19.59 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 10477 520046 1 0 3 0x100083 ttyin getty 65520 303964 0 0 3 0x14200 acct acct 15900 299436 0 0 3 0x14280 nfsidl nfsio 68999 415310 0 0 3 0x14280 nfsidl nfsio 7128 338030 0 0 3 0x14280 nfsidl nfsio 9424 239034 0 0 3 0x14280 nfsidl nfsio 3680 12130 0 0 3 0x14280 nfsidl nfsio 16620 175183 0 0 3 0x14280 nfsidl nfsio 54 123498 0 0 3 0x14280 nfsidl nfsio 51395 238262 0 0 3 0x14280 nfsidl nfsio 66061 383616 0 0 3 0x14280 nfsidl nfsio 79473 448229 0 0 3 0x14280 nfsidl nfsio 38378 436098 0 0 3 0x14280 nfsidl nfsio 19632 451738 0 0 3 0x14280 nfsidl nfsio 10735 524004 0 0 3 0x14280 nfsidl nfsio 9677 150730 0 0 3 0x14280 nfsidl nfsio 78519 137571 0 0 3 0x14280 nfsidl nfsio 59511 96461 0 0 3 0x14280 nfsidl nfsio 43898 162341 0 0 3 0x14280 nfsidl nfsio 21267 411428 0 0 3 0x14280 nfsidl nfsio 91760 210183 0 0 3 0x14280 nfsidl nfsio 78208 413717 0 0 3 0x14280 nfsidl nfsio 58651 191940 0 0 3 0x14200 bored sosplice 94267 302102 79809 0 3 0x82 wait syz-fuzzer 94267 143475 79809 0 3 0x4000082 nanoslp syz-fuzzer 94267 471620 79809 0 3 0x4000082 wait syz-fuzzer 94267 62058 79809 0 3 0x4000082 wait syz-fuzzer 94267 359552 79809 0 3 0x4000082 thrsleep syz-fuzzer 94267 460909 79809 0 3 0x4000082 thrsleep syz-fuzzer 94267 109280 79809 0 3 0x4000082 kqread syz-fuzzer 94267 400261 79809 0 3 0x4000082 wait syz-fuzzer 94267 97330 79809 0 3 0x4000082 thrsleep syz-fuzzer 94267 351098 79809 0 3 0x4000082 thrsleep syz-fuzzer 94267 426190 79809 0 3 0x4000082 wait syz-fuzzer 94267 182913 79809 0 3 0x4000082 wait syz-fuzzer 94267 419526 79809 0 3 0x4000082 thrsleep syz-fuzzer 94267 401602 79809 0 3 0x4000082 wait syz-fuzzer 94267 379222 79809 0 3 0x4000082 wait syz-fuzzer 79809 101425 96678 0 3 0x10008a sigsusp ksh 96678 371627 27949 0 3 0x9a kqread sshd 27949 148307 1 0 3 0x88 kqread sshd 704 205839 68050 73 2 0x1100010 syslogd 68050 306843 1 0 3 0x100082 netio syslogd 49486 156101 1 0 3 0x100080 kqread resolvd 68795 146607 0 0 3 0x14200 bored smr 26968 57594 0 0 2 0x14200 zerothread 85785 500226 0 0 3 0x14200 aiodoned aiodoned 45870 188724 0 0 3 0x14200 syncer update 12765 228421 0 0 3 0x14200 cleaner cleaner *47331 256013 0 0 7 0x14200 reaper 67526 290179 0 0 3 0x14200 pgdaemon pagedaemon 84993 297661 0 0 3 0x14200 bored viomb 9770 131968 0 0 3 0x40014200 acpi0 acpi0 51067 276429 0 0 3 0x14200 bored softnet 59077 428481 0 0 3 0x14200 bored softnet 32410 1136 0 0 3 0x14200 bored softnet 22576 316708 0 0 3 0x14200 bored softnet 64045 169752 0 0 3 0x14200 bored systqmp 44219 280014 0 0 3 0x14200 bored systq 30182 444485 0 0 3 0x40014200 bored softclock 99260 330892 0 0 3 0x40014200 idle0 1 8952 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 10208 6429K 6864K 78643K 14694 0 pcb 13 22K 30K 78643K 12381 0 rtable 187 15K 18K 78643K 3006 0 ifaddr 176 39K 41K 78643K 1326 0 sysctl 3 1K 2K 78643K 9 0 counters 27 17K 17K 78643K 453 0 ioctlops 0 0K 4K 78643K 1959 0 iov 0 0K 28K 78643K 1483 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1502 94K 94K 78643K 6406 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 109 0 VM map 2 0K 0K 78643K 2 0 sem 21 3K 3K 78643K 465 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 8 25K 69K 78643K 9179 0 sigio 0 0K 0K 78643K 185 0 proc 54 43K 75K 78643K 2339 0 subproc 78 4K 6K 78643K 822 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 548 0 in_multi 73 4K 7K 78643K 1024 0 ether_multi 1 0K 0K 78643K 62 0 mrt 1 0K 0K 78643K 50 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 175 784K 784K 78643K 175 0 exec 0 0K 1K 78643K 2443 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 439 1145K 1145K 78643K 59339 0 UVM aobj 131 5K 5K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 383 0 NDP 15 0K 2K 78643K 378 0 temp 142 4694K 4822K 78643K 140315 0 kqueue 6 10K 24K 78643K 713 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 120 835 0 834 10 9 1 3 0 8 0 rtentry 112 937 0 861 7 4 3 4 0 8 0 unpcb 144 6828 0 6822 59 58 1 10 0 8 0 syncache 296 63 0 63 12 12 0 1 0 8 0 tcpqe 32 295 0 295 8 8 0 1 0 8 0 tcpcb 776 2897 0 2893 112 111 1 14 0 8 0 arp 88 135 0 121 1 0 1 1 0 8 0 ipq 40 5 0 5 3 3 0 1 0 8 0 ipqe 40 15 0 15 3 3 0 1 0 8 0 inpcb 336 19587 0 19583 176 175 1 18 0 8 0 nd6 48 203 0 187 1 0 1 1 0 8 0 pkpcb 40 34 0 34 9 9 0 1 0 8 0 kcovpl 48 62 0 56 1 0 1 1 0 8 0 mppekey 1024 10 0 10 3 3 0 1 0 8 0 ppxss 1160 274 0 274 16 16 0 1 0 8 0 pppxif 1608 127 0 127 16 16 0 1 0 8 0 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 120 2 0 0 1 0 1 1 0 8 0 pfstate 352 1 0 0 1 0 1 1 0 8 0 rttmr 136 10 0 10 3 3 0 1 0 8 0 art_heap8 4096 8 0 7 8 7 1 2 0 8 0 art_heap4 256 4235 0 3894 62 36 26 31 0 8 0 art_table 32 4243 0 3901 5 1 4 4 0 8 0 art_node 16 933 0 867 1 0 1 1 0 8 0 semupl 112 6 0 6 2 2 0 1 0 8 0 semapl 112 461 0 442 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 14573 0 13122 92 0 92 92 0 8 0 ffsino 240 14573 0 13122 86 0 86 86 0 8 0 nchpl 144 26912 0 26443 63 41 22 63 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 uvmvnodes 80 9059 0 0 185 0 185 185 0 8 0 vnodes 216 9059 0 0 504 0 504 504 0 8 0 namei 1024 98237 0 98237 12 11 1 2 0 8 1 vcpupl 2048 300 0 0 38 0 38 38 0 8 0 vmpool 536 326 0 26 20 0 20 20 0 8 0 kstatmem 264 478 0 448 5 2 3 3 0 8 0 scsiplug 72 12 0 12 4 4 0 1 0 8 0 scxspl 216 82666 0 82666 30 29 1 8 0 8 1 plimitpl 152 1332 0 1317 1 0 1 1 0 8 0 sigapl 424 9376 0 9314 8 0 8 8 0 8 0 futexpl 64 95501 0 95501 6 5 1 1 0 8 1 knotepl 120 121340 0 121292 57 54 3 10 0 8 0 kqueuepl 184 1584 0 1579 17 16 1 4 0 8 0 pipepl 288 2406 0 2386 44 41 3 7 0 8 0 fdescpl 432 9338 0 9322 4 1 3 4 0 8 0 filepl 120 73834 0 73669 91 84 7 16 0 8 0 lockfpl 104 2179 0 2178 6 5 1 2 0 8 0 lockfspl 48 523 0 522 1 0 1 1 0 8 0 sessionpl 144 80 0 65 1 0 1 1 0 8 0 pgrppl 48 92 0 77 1 0 1 1 0 8 0 ucredpl 104 10251 0 10238 1 0 1 1 0 8 0 zombiepl 144 9328 0 9314 2 1 1 1 0 8 0 processpl 1000 9376 0 9314 10 1 9 9 0 8 0 procpl 672 23426 0 23344 23 15 8 10 0 8 0 sosppl 168 91 0 91 18 18 0 1 0 8 0 sockpl 456 27354 0 27343 443 441 2 32 0 8 0 mcl64k 65536 370 0 370 16 16 0 1 0 8 0 mcl16k 16384 140 0 140 21 21 0 1 0 8 0 mcl12k 12288 291 0 291 22 22 0 1 0 8 0 mcl9k 9216 152 0 152 20 20 0 1 0 8 0 mcl8k 8192 504 0 504 17 17 0 1 0 8 0 mcl4k 4096 1001 0 1001 12 12 0 1 0 8 0 mcl2k2 2112 61 0 61 23 23 0 1 0 8 0 mcl2k 2048 91108 0 91060 61 54 7 35 0 8 0 mtagpl 96 234 0 234 10 10 0 5 0 8 0 mbufpl 256 256910 0 256858 705 684 21 70 0 8 8 bufpl 288 21165 0 14755 459 0 459 459 0 8 0 anonpl 24 1766372 0 1745571 241 114 127 133 0 188 0 amapchunkpl 152 165254 0 164268 75 36 39 42 0 158 0 amappl16 200 16262 0 15652 103 69 34 44 0 8 0 amappl15 192 70 0 70 2 2 0 1 0 8 0 amappl14 184 345 0 335 2 0 2 2 0 8 0 amappl13 176 9 0 9 2 2 0 1 0 8 0 amappl12 168 1043 0 1039 1 0 1 1 0 8 0 amappl11 160 53 0 48 1 0 1 1 0 8 0 amappl10 152 123 0 112 1 0 1 1 0 8 0 amappl9 144 1064 0 1062 1 0 1 1 0 8 0 amappl8 136 445 0 371 3 0 3 3 0 8 0 amappl7 128 88 0 69 1 0 1 1 0 8 0 amappl6 120 858 0 843 2 1 1 2 0 8 0 amappl5 112 242 0 237 1 0 1 1 0 8 0 amappl4 104 1405 0 1379 2 1 1 2 0 8 0 amappl3 96 25807 0 25761 2 0 2 2 0 8 0 amappl2 88 10213 0 10162 3 1 2 3 0 8 0 amappl1 80 209182 0 208589 21 7 14 21 0 8 0 amappl 88 58337 0 58106 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 9664 0 9341 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9664 0 9341 2 0 2 2 0 8 0 vmmpekpl 168 70855 0 70778 7 2 5 5 0 8 0 vmmpepl 168 866358 0 863407 317 174 143 154 0 357 0 vmsppl 272 9663 0 9340 24 2 22 22 0 8 0 rwobjpl 24 226106 0 215301 69 3 66 66 0 8 0 pdppl 4096 19334 0 18980 848 494 354 358 0 8 0 pvpl 32 3525215 0 3504211 454 216 238 269 0 265 39 pmappl 216 9663 0 9340 19 0 19 19 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2690 0 1575 37 3 34 34 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(ffffffff8257ca43) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f143f,ffffffff825a25e9,4f5,ffffffff825a261c) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800602da80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680c9bb8,ffcd1127000,ffcd1128000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80680c9bb8,fffffd806a014598,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80680c9bb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3504 reaper(ffff8000ffff9ce8) 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(ffffffff8257ca43) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f143f,ffffffff825a25e9,4f5,ffffffff825a261c) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800602da80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680c9bb8,ffcd1127000,ffcd1128000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80680c9bb8,fffffd806a014598,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680c9bb8) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80680c9bb8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3504 reaper(ffff8000ffff9ce8) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9