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 *411082 30466 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8254daa7) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bd55e,ffffffff825710cd,4fb,ffffffff82571100) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d55180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd806845c110,72222eee000,722230ed000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1666 uvm_unmap_kill_entry_withlock(fffffd806845c110,fffffd80653b0970,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806845c110) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) 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(ffffffff8254daa7) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bd55e,ffffffff825710cd,4fb,ffffffff82571100) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d55180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd806845c110,72222eee000,722230ed000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1666 uvm_unmap_kill_entry_withlock(fffffd806845c110,fffffd80653b0970,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806845c110) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000215be800 rbx 0xfffffd8005d55180 rdx 0 rcx 0 rax 0xffff8000fffff7a0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xff19cfd2df32232b r11 0xcf5b4243554c5893 r12 0 r13 0xffffffff826dcaf8 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff816e64a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000215be7f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=411082 stat=onproc flags process=14000 proc=200 pri=86, usrpri=85, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffff500,0xffff8000fffffa50 process=0xffff8000ffffabc0 user=0xffff8000215b9000, vmspace=0xffffffff829a6a38 estcpu=35, cpticks=9, pctcpu=14.24 user=0, sys=332, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 33176 467510 7345 0 3 0x82 wait syz-executor.0 82706 502277 0 0 3 0x14200 acct acct 64136 67302 7345 0 2 0x482 syz-executor.5 41788 324356 7345 0 3 0x82 wait syz-executor.7 38398 187122 7345 0 3 0x82 wait syz-executor.3 21439 309390 7345 0 3 0x82 wait syz-executor.2 4584 499313 7345 0 2 0x482 syz-executor.6 53533 173862 7345 0 2 0x482 syz-executor.1 7345 517548 12082 0 3 0x82 thrsleep syz-fuzzer 7345 352226 12082 0 2 0x4000482 syz-fuzzer 7345 32011 12082 0 3 0x4000082 thrsleep syz-fuzzer 7345 360900 12082 0 3 0x4000082 thrsleep syz-fuzzer 7345 162604 12082 0 3 0x4000082 thrsleep syz-fuzzer 7345 137951 12082 0 3 0x4000082 thrsleep syz-fuzzer 7345 342192 12082 0 2 0x4000002 syz-fuzzer 7345 151269 12082 0 3 0x4000082 thrsleep syz-fuzzer 12082 90891 78085 0 3 0x10008a sigsusp ksh 78085 378026 53908 0 3 0x9a poll sshd 98425 171991 1 0 3 0x100083 ttyin getty 53908 509311 1 0 3 0x88 poll sshd 39574 359847 88182 73 2 0x100010 syslogd 88182 2846 1 0 3 0x100082 netio syslogd 65849 346573 1 0 3 0x100080 kqread resolvd 62908 416496 10079 77 3 0x100092 kqread dhcpleased 75959 261595 10079 77 3 0x100092 kqread dhcpleased 10079 483360 1 0 3 0x80 kqread dhcpleased 12156 128168 0 0 3 0x14200 bored smr 20366 421235 0 0 2 0x14200 zerothread 43531 209129 0 0 3 0x14200 aiodoned aiodoned 40996 40636 0 0 2 0x14600 update 5543 296163 0 0 3 0x14200 cleaner cleaner *30466 411082 0 0 7 0x14200 reaper 18125 270437 0 0 3 0x14200 pgdaemon pagedaemon 77374 296135 0 0 3 0x14200 bored viomb 18046 466426 0 0 3 0x40014200 acpi0 acpi0 42177 337740 0 0 3 0x14200 bored softnet 42213 421726 0 0 2 0x14200 systqmp 14119 54837 0 0 3 0x14200 bored systq 33192 427329 0 0 2 0x40014200 softclock 30329 205418 0 0 3 0x40014200 idle0 1 454509 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 10154 6446K 7389K 78643K 13083 0 pcb 13 11K 12K 78643K 173 0 rtable 206 6K 10K 78643K 619 0 ifaddr 77 16K 19K 78643K 196 0 counters 26 17K 17K 78643K 40 0 ioctlops 0 0K 4K 78643K 272 0 iov 0 0K 16K 78643K 214 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1339 84K 84K 78643K 1828 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 91 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 9 29K 69K 78643K 1111 0 sigio 0 0K 0K 78643K 3 0 proc 58 55K 79K 78643K 611 0 subproc 91 5K 6K 78643K 177 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 111 0 in_multi 88 5K 6K 78643K 183 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 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 835 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 345 195K 202K 78643K 14599 0 UVM aobj 11 2K 2K 78643K 11 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 81 0 NDP 10 0K 1K 78643K 50 0 temp 124 4691K 4763K 78643K 7842 0 kqueue 10 14K 19K 78643K 71 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 77 0 74 1 0 1 1 0 8 0 rtentry 112 170 0 78 4 0 4 4 0 8 0 unpcb 136 1082 0 1069 14 13 1 8 0 8 0 syncache 296 7 0 7 2 2 0 1 0 8 0 tcpqe 32 266 0 266 2 2 0 2 0 8 0 tcpcb 736 320 0 316 12 11 1 7 0 8 0 arp 88 28 0 12 1 0 1 1 0 8 0 inpcb 304 907 0 900 18 17 1 11 0 8 0 nd6 48 42 0 20 1 0 1 1 0 8 0 kcovpl 48 13 0 6 1 0 1 1 0 8 0 ppxss 1152 5 0 5 2 2 0 1 0 8 0 pfstscr 40 11 0 9 1 0 1 1 0 8 0 pfrktable 1344 33 0 33 2 1 1 1 0 8 1 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 8 0 6 1 0 1 1 0 8 0 pfstkey 112 14 0 12 1 0 1 1 0 8 0 pfstate 320 7 0 6 1 0 1 1 0 8 0 pfrule 1360 122 0 119 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 721 0 318 33 4 29 29 0 8 2 art_table 32 722 0 318 4 0 4 4 0 8 0 art_node 16 169 0 88 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 1 0 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 88 0 78 1 0 1 1 0 8 0 shmpl 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 2650 0 1214 91 0 91 91 0 8 0 ffsino 240 2650 0 1214 85 0 85 85 0 8 0 nchpl 144 4604 0 2978 63 0 63 63 0 8 0 uvmvnodes 80 3212 0 0 66 0 66 66 0 8 0 vnodes 224 3212 0 0 189 0 189 189 0 8 0 namei 1024 18631 0 18630 3 2 1 2 0 8 0 vcpupl 1984 12 0 0 2 0 2 2 0 8 0 vmpool 528 12 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 10 0 10 2 1 1 1 0 8 1 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 13361 0 13361 9 8 1 8 0 8 1 plimitpl 152 154 0 140 1 0 1 1 0 8 0 sigapl 424 1390 0 1356 5 0 5 5 0 8 0 futexpl 64 10979 0 10979 1 0 1 1 0 8 1 knotepl 112 804 0 736 3 0 3 3 0 8 0 kqueuepl 184 268 0 262 6 5 1 4 0 8 0 pipepl 304 296 0 271 5 2 3 5 0 8 0 fdescpl 432 1376 0 1356 4 0 4 4 0 8 0 filepl 120 11400 0 11187 21 13 8 15 0 8 0 lockfpl 104 404 0 402 3 2 1 2 0 8 0 lockfspl 48 69 0 67 1 0 1 1 0 8 0 sessionpl 144 28 0 12 1 0 1 1 0 8 0 pgrppl 48 101 0 85 1 0 1 1 0 8 0 ucredpl 96 922 0 912 1 0 1 1 0 8 0 zombiepl 144 1356 0 1348 1 0 1 1 0 8 0 processpl 1000 1390 0 1348 6 0 6 6 0 8 0 procpl 672 2912 0 2855 8 2 6 7 0 8 1 sockpl 448 2070 0 2047 54 48 6 29 0 8 3 mcl64k 65536 48 0 48 3 2 1 1 0 8 1 mcl16k 16384 9 0 9 3 3 0 1 0 8 0 mcl12k 12288 31 0 31 2 2 0 1 0 8 0 mcl9k 9216 9 0 9 3 3 0 1 0 8 0 mcl8k 8192 59 0 59 2 2 0 1 0 8 0 mcl4k 4096 119 0 119 2 1 1 1 0 8 1 mcl2k2 2112 4 0 4 2 2 0 1 0 8 0 mcl2k 2048 78643 0 78595 28 20 8 27 0 8 0 mtagpl 96 304 0 71 8 1 7 7 0 8 0 mbufpl 256 132601 0 131934 56 7 49 50 0 8 3 bufpl 288 5785 0 145 403 0 403 403 0 8 0 anonpl 24 365193 0 334287 216 13 203 203 0 188 0 amapchunkpl 152 37267 0 35690 63 2 61 61 0 158 0 amappl16 200 3641 0 2868 52 10 42 52 0 8 0 amappl15 192 362 0 352 1 0 1 1 0 8 0 amappl14 184 151 0 146 1 0 1 1 0 8 0 amappl13 176 128 0 125 1 0 1 1 0 8 0 amappl12 168 23 0 20 1 0 1 1 0 8 0 amappl11 160 294 0 280 1 0 1 1 0 8 0 amappl10 152 199 0 195 1 0 1 1 0 8 0 amappl9 144 578 0 573 1 0 1 1 0 8 0 amappl8 136 801 0 744 3 1 2 3 0 8 0 amappl7 128 272 0 261 1 0 1 1 0 8 0 amappl6 120 307 0 285 2 1 1 2 0 8 0 amappl5 112 987 0 970 1 0 1 1 0 8 0 amappl4 104 1539 0 1503 2 0 2 2 0 8 0 amappl3 96 234 0 222 1 0 1 1 0 8 0 amappl2 88 652 0 603 3 1 2 3 0 8 0 amappl1 80 27586 0 27003 18 5 13 18 0 8 0 amappl 88 14076 0 13817 7 1 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 10 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1388 0 1349 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1388 0 1349 1 0 1 1 0 8 0 vmmpekpl 168 14146 0 14099 3 0 3 3 0 8 0 vmmpepl 168 131746 0 128947 152 27 125 148 0 357 3 vmsppl 272 1387 0 1348 4 1 3 3 0 8 0 rwobjpl 24 34894 0 29924 30 0 30 30 0 8 0 pdppl 4096 2782 0 2708 182 106 76 76 0 8 2 pvpl 32 745129 0 716005 352 42 310 315 0 265 31 pmappl 216 1387 0 1348 3 0 3 3 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 969 0 209 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:440 panic(ffffffff8254daa7) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bd55e,ffffffff825710cd,4fb,ffffffff82571100) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d55180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd806845c110,72222eee000,722230ed000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1666 uvm_unmap_kill_entry_withlock(fffffd806845c110,fffffd80653b0970,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806845c110) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) 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(ffffffff8254daa7) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bd55e,ffffffff825710cd,4fb,ffffffff82571100) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd8005d55180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1275 uvm_fault_unwire_locked(fffffd806845c110,72222eee000,722230ed000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1666 uvm_unmap_kill_entry_withlock(fffffd806845c110,fffffd80653b0970,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806845c110) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806845c110) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9