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 * 60122 94288 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257fcc4) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f36e8,ffffffff825a7af4,4f5,ffffffff825a7b27) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800618c080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8079e59cc0,505c3b6a000,505c3d69000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd8079e59cc0,fffffd806c194768,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd8079e59cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 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(ffffffff8257fcc4) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f36e8,ffffffff825a7af4,4f5,ffffffff825a7b27) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800618c080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8079e59cc0,505c3b6a000,505c3d69000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd8079e59cc0,fffffd806c194768,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd8079e59cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 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 0xffff8000216c0c60 rbx 0xfffffd800618c080 rdx 0 rcx 0 rax 0xffff8000ffff9ce8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x48bf21fe164f9854 r11 0x6c67f8c18f9aeed7 r12 0 r13 0xffff8000216c0d88 r14 0 r15 0x1 rip 0xffffffff82352378 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216c0c50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=60122 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffff7a0,0xffff8000ffff8a98 process=0xffff8000ffffafa8 user=0xffff8000216bb000, vmspace=0xffffffff82a29840 estcpu=36, cpticks=29, pctcpu=20.28 user=0, sys=1399, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 88663 57441 11540 0 3 0x82 wait syz-executor.6 49447 216858 0 0 3 0x14200 bored sosplice 40189 375341 11540 0 3 0x82 wait syz-executor.7 16020 31903 11540 0 3 0x82 wait syz-executor.3 5683 460259 11540 0 3 0x82 wait syz-executor.2 30741 119320 11540 0 3 0x82 wait syz-executor.4 11540 305337 15950 0 3 0x82 wait syz-fuzzer 11540 84901 15950 0 2 0x4000482 syz-fuzzer 11540 106734 15950 0 3 0x4000082 thrsleep syz-fuzzer 11540 182929 15950 0 3 0x4000082 thrsleep syz-fuzzer 11540 392421 15950 0 3 0x4000082 wait syz-fuzzer 11540 467798 15950 0 3 0x4000082 wait syz-fuzzer 11540 375106 15950 0 3 0x4000082 wait syz-fuzzer 11540 402720 15950 0 3 0x4000082 wait syz-fuzzer 11540 174649 15950 0 3 0x4000082 thrsleep syz-fuzzer 11540 74314 15950 0 3 0x4000082 thrsleep syz-fuzzer 11540 35409 15950 0 3 0x4000082 wait syz-fuzzer 11540 401549 15950 0 2 0x4000002 syz-fuzzer 11540 500352 15950 0 3 0x4000082 wait syz-fuzzer 11540 96285 15950 0 3 0x4000082 thrsleep syz-fuzzer 15950 153088 59496 0 3 0x10008a sigsusp ksh 59496 299759 61160 0 3 0x9a kqread sshd 50935 35382 1 0 3 0x100083 ttyin getty 61160 160983 1 0 3 0x88 kqread sshd 83258 282089 88112 73 2 0x1100010 syslogd 88112 17804 1 0 3 0x100082 netio syslogd 98721 389686 1 0 3 0x100080 kqread resolvd 94105 298917 85901 77 3 0x100092 kqread dhcpleased 26592 461576 85901 77 3 0x100092 kqread dhcpleased 85901 54786 1 0 3 0x80 kqread dhcpleased 96443 39693 0 0 3 0x14200 bored smr 91683 366177 0 0 2 0x14200 zerothread 53445 17397 0 0 3 0x14200 aiodoned aiodoned 17258 131428 0 0 2 0x14600 update 19088 144032 0 0 3 0x14200 cleaner cleaner *94288 60122 0 0 7 0x14200 reaper 32123 100869 0 0 3 0x14200 pgdaemon pagedaemon 31464 268435 0 0 3 0x14200 bored viomb 73674 85015 0 0 3 0x40014200 acpi0 acpi0 2920 415636 0 0 3 0x14200 bored softnet 29919 511837 0 0 3 0x14200 bored softnet 54409 60978 0 0 3 0x14200 bored softnet 83016 322037 0 0 2 0x14200 softnet 35365 77869 0 0 2 0x14200 systqmp 7405 482777 0 0 3 0x14200 bored systq 57431 187319 0 0 2 0x40014200 softclock 88012 381677 0 0 3 0x40014200 idle0 1 445885 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 10164 6388K 6984K 78643K 12134 0 pcb 13 8K 8K 78643K 157 0 rtable 105 3K 7K 78643K 507 0 ifaddr 57 14K 17K 78643K 207 0 counters 22 16K 17K 78643K 60 0 ioctlops 0 0K 2K 78643K 86 0 iov 0 0K 2K 78643K 11 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1289 81K 81K 78643K 1851 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 10 1K 1K 78643K 17 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 7 21K 73K 78643K 1412 0 sigio 0 0K 0K 78643K 37 0 proc 60 59K 91K 78643K 650 0 subproc 65 4K 6K 78643K 156 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 61 0 in_multi 33 2K 7K 78643K 189 0 ether_multi 1 0K 0K 78643K 19 0 mrt 0 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 73 334K 334K 78643K 73 0 exec 0 0K 1K 78643K 461 0 pfkey data 0 0K 0K 78643K 3 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 266 222K 232K 78643K 9569 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 70 0 NDP 5 0K 2K 78643K 57 0 temp 96 4693K 4758K 78643K 16069 0 kqueue 12 18K 28K 78643K 172 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 90 0 87 1 0 1 1 0 8 0 rtentry 112 161 0 117 4 1 3 4 0 8 0 unpcb 144 615 0 602 2 1 1 2 0 8 0 syncache 296 37 0 37 3 3 0 1 0 8 0 tcpqe 32 134 0 134 5 5 0 1 0 8 0 tcpcb 776 314 0 310 3 2 1 2 0 8 0 arp 88 26 0 20 1 0 1 1 0 8 0 inpcb 336 859 0 852 3 2 1 3 0 8 0 nd6 48 36 0 30 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 kcovpl 48 12 0 7 1 0 1 1 0 8 0 ppxss 1160 18 0 18 2 2 0 1 0 8 0 pppxif 1608 6 0 6 1 1 0 1 0 8 0 pfstscr 40 5 0 5 2 2 0 1 0 8 0 pfstkey 120 10 0 10 2 2 0 1 0 8 0 pfstate 352 5 0 5 2 2 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 671 0 479 29 13 16 29 0 8 0 art_table 32 672 0 479 4 0 4 4 0 8 0 art_node 16 160 0 120 1 0 1 1 0 8 0 sysvmsgpl 40 55 0 30 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3260 0 1827 91 0 91 91 0 8 0 ffsino 240 3260 0 1827 85 0 85 85 0 8 0 nchpl 144 5237 0 3619 63 0 63 63 0 8 0 uvmvnodes 80 3767 0 0 77 0 77 77 0 8 0 vnodes 216 3767 0 0 210 0 210 210 0 8 0 namei 1024 14706 0 14705 6 5 1 2 0 8 0 vcpupl 2048 9 0 0 2 0 2 2 0 8 0 vmpool 536 9 0 0 1 0 1 1 0 8 0 kstatmem 264 66 0 56 2 0 2 2 0 8 0 scxspl 216 15384 0 15384 9 8 1 8 0 8 1 plimitpl 152 81 0 64 1 0 1 1 0 8 0 sigapl 424 1695 0 1651 6 0 6 6 0 8 0 futexpl 64 10207 0 10207 3 3 0 1 0 8 0 knotepl 120 14800 0 14730 7 3 4 6 0 8 0 kqueuepl 184 197 0 189 1 0 1 1 0 8 0 pipepl 288 204 0 181 3 0 3 3 0 8 0 fdescpl 432 1678 0 1660 4 0 4 4 0 8 0 filepl 120 6039 0 5862 10 2 8 9 0 8 0 lockfpl 104 76 0 74 1 0 1 1 0 8 0 lockfspl 48 39 0 37 1 0 1 1 0 8 0 sessionpl 144 27 0 12 1 0 1 1 0 8 0 pgrppl 48 27 0 12 1 0 1 1 0 8 0 ucredpl 104 1011 0 1001 1 0 1 1 0 8 0 zombiepl 144 1660 0 1651 1 0 1 1 0 8 0 processpl 1000 1695 0 1651 7 1 6 6 0 8 0 procpl 672 3152 0 3087 8 2 6 7 0 8 0 sosppl 168 51 0 51 2 2 0 1 0 8 0 sockpl 456 1568 0 1545 8 5 3 7 0 8 0 mcl64k 65536 16 0 16 1 1 0 1 0 8 0 mcl12k 12288 19 0 19 1 1 0 1 0 8 0 mcl9k 9216 5 0 5 1 1 0 1 0 8 0 mcl8k 8192 51 0 51 2 2 0 1 0 8 0 mcl4k 4096 52 0 52 2 2 0 1 0 8 0 mcl2k 2048 20519 0 20418 47 29 18 34 0 8 1 mtagpl 96 83 0 65 3 1 2 2 0 8 0 mbufpl 256 68983 0 68748 245 224 21 116 0 8 0 bufpl 288 7447 0 1042 458 0 458 458 0 8 0 anonpl 24 392555 0 360338 290 26 264 270 0 188 67 amapchunkpl 152 31471 0 29406 111 8 103 109 0 158 23 amappl16 200 4267 0 4121 20 12 8 19 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 172 0 159 2 1 1 2 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 443 0 438 1 0 1 1 0 8 0 amappl11 160 44 0 33 1 0 1 1 0 8 0 amappl10 152 32 0 24 1 0 1 1 0 8 0 amappl9 144 951 0 950 1 0 1 1 0 8 0 amappl8 136 135 0 93 2 0 2 2 0 8 0 amappl7 128 46 0 32 1 0 1 1 0 8 0 amappl6 120 295 0 280 2 1 1 2 0 8 0 amappl5 112 84 0 75 1 0 1 1 0 8 0 amappl4 104 505 0 485 2 0 2 2 0 8 0 amappl3 96 4028 0 3964 2 0 2 2 0 8 0 amappl2 88 2033 0 1968 3 1 2 3 0 8 0 amappl1 80 38085 0 37358 21 6 15 21 0 8 0 amappl 88 9229 0 9055 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1687 0 1652 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1687 0 1652 1 0 1 1 0 8 0 vmmpekpl 168 15137 0 15093 3 0 3 3 0 8 0 vmmpepl 168 151318 0 149123 103 7 96 102 0 357 0 vmsppl 272 1686 0 1651 4 1 3 3 0 8 0 rwobjpl 24 43999 0 39004 31 0 31 31 0 8 0 pdppl 4096 3380 0 3311 125 56 69 73 0 8 0 pvpl 32 843298 0 806941 548 40 508 517 0 265 205 pmappl 216 1686 0 1651 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1110 0 337 23 0 23 23 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(ffffffff8257fcc4) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f36e8,ffffffff825a7af4,4f5,ffffffff825a7b27) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800618c080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8079e59cc0,505c3b6a000,505c3d69000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd8079e59cc0,fffffd806c194768,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd8079e59cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 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(ffffffff8257fcc4) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f36e8,ffffffff825a7af4,4f5,ffffffff825a7b27) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800618c080) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8079e59cc0,505c3b6a000,505c3d69000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd8079e59cc0,fffffd806c194768,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8079e59cc0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd8079e59cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 reaper(ffff8000ffff9ce8) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9