panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1268 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *469270 47881 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8242c312) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249ce29,ffffffff82450f59,4f4,ffffffff82450f8c) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800677b180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806c6d6780,8f02728e000,8f02728f000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806c6d6780,fffffd80766f32a8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806c6d6780) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff500) 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 1268 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8242c312) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249ce29,ffffffff82450f59,4f4,ffffffff82450f8c) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800677b180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806c6d6780,8f02728e000,8f02728f000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806c6d6780,fffffd80766f32a8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806c6d6780) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002160dd70 rbx 0xfffffd800677b180 rdx 0 rcx 0 rax 0xffff8000fffff500 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb1907bfd0bf7257a r11 0x322f42f427ba865e r12 0 r13 0xffffffff8250ed28 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff813b4d28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002160dd60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=469270 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffefc0,0xffff8000fffff7b0 process=0xffff8000ffffb390 user=0xffff800021609000, vmspace=0xffffffff8289d2d8 estcpu=36, cpticks=44, pctcpu=6.2 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 91444 223053 59495 0 3 0x82 wait syz-executor.0 30018 106292 59495 0 3 0x82 nanoslp syz-executor.1 82388 38126 0 0 3 0x14280 nfsidl nfsio 84078 141019 0 0 3 0x14280 nfsidl nfsio 42487 514998 0 0 3 0x14280 nfsidl nfsio 57556 189049 0 0 3 0x14280 nfsidl nfsio 4538 63632 0 0 3 0x14280 nfsidl nfsio 70976 350266 0 0 3 0x14280 nfsidl nfsio 7086 494923 0 0 3 0x14280 nfsidl nfsio 73617 521532 0 0 3 0x14280 nfsidl nfsio 17393 391929 0 0 3 0x14280 nfsidl nfsio 8412 452023 0 0 3 0x14280 nfsidl nfsio 26083 398556 0 0 3 0x14280 nfsidl nfsio 42901 59811 0 0 3 0x14280 nfsidl nfsio 18515 353602 0 0 3 0x14280 nfsidl nfsio 46176 298738 0 0 3 0x14280 nfsidl nfsio 81972 388662 0 0 3 0x14280 nfsidl nfsio 16722 247803 0 0 3 0x14280 nfsidl nfsio 49334 450982 0 0 3 0x14280 nfsidl nfsio 62995 45639 0 0 3 0x14280 nfsidl nfsio 20952 54807 0 0 3 0x14280 nfsidl nfsio 31114 15800 0 0 3 0x14280 nfsidl nfsio 34907 285560 0 0 3 0x14200 acct acct 13673 320861 0 0 3 0x14200 bored sosplice 24329 232105 59495 0 3 0x82 wait syz-executor.3 59495 465410 10910 0 2 0x2 syz-fuzzer 59495 279565 10910 0 3 0x4000082 nanoslp syz-fuzzer 59495 236445 10910 0 3 0x4000082 thrsleep syz-fuzzer 59495 152722 10910 0 3 0x4000082 thrsleep syz-fuzzer 59495 427980 10910 0 3 0x4000082 thrsleep syz-fuzzer 59495 317833 10910 0 3 0x4000082 thrsleep syz-fuzzer 59495 10034 10910 0 3 0x4000082 thrsleep syz-fuzzer 10910 387799 87317 0 3 0x10008a sigsusp ksh 87317 187122 5889 0 3 0x9a poll sshd 19404 324723 1 0 3 0x100083 ttyin getty 5889 406679 1 0 3 0x88 poll sshd 49736 33226 74953 73 2 0x100010 syslogd 74953 102183 1 0 3 0x100082 netio syslogd 9788 199483 1 0 3 0x100080 kqread resolvd 71946 83588 31783 77 3 0x100092 kqread dhcpleased 16291 326393 31783 77 3 0x100092 kqread dhcpleased 31783 477568 1 0 3 0x80 kqread dhcpleased 79203 265040 0 0 3 0x14200 bored smr 35110 147300 0 0 2 0x14200 zerothread 18600 145199 0 0 3 0x14200 aiodoned aiodoned 55790 394880 0 0 3 0x14200 syncer update 29140 388982 0 0 3 0x14200 cleaner cleaner *47881 469270 0 0 7 0x14200 reaper 91196 272003 0 0 3 0x14200 pgdaemon pagedaemon 61610 327143 0 0 3 0x14200 bored viomb 90511 249358 0 0 3 0x40014200 acpi0 acpi0 38825 16374 0 0 3 0x14200 bored softnet 64937 243910 0 0 3 0x14200 bored systqmp 63073 279040 0 0 3 0x14200 bored systq 64345 232078 0 0 3 0x40014200 bored softclock 95469 367760 0 0 3 0x40014200 idle0 1 421636 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 10143 6389K 14712K 78643K 15721 0 pcb 13 16K 21K 78643K 1297 0 rtable 131 12K 13K 78643K 717 0 ifaddr 46 12K 13K 78643K 196 0 counters 22 16K 17K 78643K 51 0 ioctlops 0 0K 4K 78643K 488 0 iov 0 0K 16K 78643K 138 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1422 89K 90K 78643K 2947 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 23 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 931 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 49K 78643K 1930 0 sigio 0 0K 0K 78643K 2 0 proc 58 55K 71K 78643K 587 0 subproc 39 2K 3K 78643K 143 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 74 0 in_multi 44 2K 4K 78643K 209 0 ether_multi 1 0K 0K 78643K 27 0 mrt 1 0K 0K 78643K 1 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 1160 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 299 251K 251K 78643K 24097 0 UVM aobj 72 3K 3K 78643K 75 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 64 0 NDP 6 0K 1K 78643K 61 0 temp 81 4187K 4258K 78643K 23944 0 kqueue 11 16K 20K 78643K 80 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 120 208 0 205 5 4 1 3 0 8 0 rtentry 112 152 0 97 3 1 2 3 0 8 0 unpcb 136 1075 0 1062 13 10 3 5 0 8 2 syncache 296 12 0 12 3 3 0 1 0 8 0 tcpqe 32 98 0 98 2 2 0 1 0 8 0 tcpcb 736 547 0 543 24 23 1 10 0 8 0 arp 88 24 0 16 1 0 1 1 0 8 0 inpcb 304 3111 0 3104 29 23 6 11 0 8 5 nd6 48 37 0 28 1 0 1 1 0 8 0 kcovpl 48 11 0 8 1 0 1 1 0 8 0 ppxss 1152 12 0 12 3 3 0 1 0 8 0 pffrag 232 3 0 2 1 0 1 1 0 482 0 pffrnode 88 3 0 2 1 0 1 1 0 8 0 pffrent 40 11 0 10 1 0 1 1 0 8 0 pfrule 1360 5 0 5 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 596 0 358 22 4 18 18 0 8 2 art_table 32 597 0 358 3 0 3 3 0 8 1 art_node 16 148 0 98 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 8 1 0 1 1 0 8 0 semupl 112 7 0 7 1 1 0 1 0 8 0 semapl 112 929 0 919 1 0 1 1 0 8 0 shmpl 112 72 0 3 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3978 0 2575 89 0 89 89 0 8 0 ffsino 240 3978 0 2575 83 0 83 83 0 8 0 nchpl 144 6573 0 4985 61 0 61 61 0 8 0 uvmvnodes 80 5269 0 0 108 0 108 108 0 8 0 vnodes 224 5269 0 0 310 0 310 310 0 8 0 namei 1024 22627 0 22626 1 0 1 1 0 8 0 vcpupl 1984 23 0 0 3 0 3 3 0 8 0 vmpool 528 77 0 54 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 18259 0 18259 13 12 1 8 0 8 1 plimitpl 152 138 0 127 1 0 1 1 0 8 0 sigapl 424 2149 0 2098 8 1 7 7 0 8 1 futexpl 64 25046 0 25046 2 1 1 1 0 8 1 knotepl 112 1190 0 1146 2 0 2 2 0 8 0 kqueuepl 184 392 0 382 8 7 1 4 0 8 0 pipepl 304 237 0 224 4 2 2 4 0 8 0 fdescpl 432 2114 0 2098 3 0 3 3 0 8 0 filepl 120 14967 0 14842 31 22 9 12 0 8 4 lockfpl 104 369 0 367 2 1 1 2 0 8 0 lockfspl 48 80 0 78 1 0 1 1 0 8 0 sessionpl 144 26 0 14 1 0 1 1 0 8 0 pgrppl 48 32 0 20 1 0 1 1 0 8 0 ucredpl 96 2018 0 2008 1 0 1 1 0 8 0 zombiepl 144 2098 0 2094 1 0 1 1 0 8 0 processpl 1000 2149 0 2094 8 0 8 8 0 8 0 procpl 672 4813 0 4746 12 6 6 7 0 8 0 sosppl 168 6 0 6 2 2 0 1 0 8 0 sockpl 448 4409 0 4386 72 62 10 25 0 8 7 mcl64k 65536 147 0 147 4 3 1 1 0 8 1 mcl16k 16384 7 0 7 3 3 0 1 0 8 0 mcl12k 12288 31 0 31 5 5 0 1 0 8 0 mcl9k 9216 28 0 28 4 4 0 1 0 8 0 mcl8k 8192 344 0 344 3 3 0 1 0 8 0 mcl4k 4096 213 0 213 5 4 1 1 0 8 1 mcl2k2 2112 14 0 14 4 4 0 1 0 8 0 mcl2k 2048 79706 0 79661 13 6 7 11 0 8 0 mtagpl 96 156 0 112 5 3 2 2 0 8 0 mbufpl 256 140133 0 139877 34 16 18 25 0 8 1 bufpl 288 7494 0 1077 459 0 459 459 0 8 0 anonpl 24 549618 0 525674 155 10 145 145 0 188 0 amapchunkpl 152 58922 0 57707 56 9 47 47 0 158 0 amappl16 200 4627 0 4004 36 2 34 35 0 8 0 amappl15 192 287 0 287 1 1 0 1 0 8 0 amappl14 184 184 0 181 1 0 1 1 0 8 0 amappl13 176 81 0 80 1 0 1 1 0 8 0 amappl12 168 352 0 348 1 0 1 1 0 8 0 amappl11 160 288 0 278 1 0 1 1 0 8 0 amappl10 152 47 0 41 1 0 1 1 0 8 0 amappl9 144 571 0 564 1 0 1 1 0 8 0 amappl8 136 1240 0 1199 2 0 2 2 0 8 0 amappl7 128 848 0 836 1 0 1 1 0 8 0 amappl6 120 286 0 270 1 0 1 1 0 8 0 amappl5 112 1646 0 1627 1 0 1 1 0 8 0 amappl4 104 1316 0 1295 1 0 1 1 0 8 0 amappl3 96 579 0 560 1 0 1 1 0 8 0 amappl2 88 446 0 406 2 0 2 2 0 8 0 amappl1 80 39774 0 39271 13 2 11 12 0 8 0 amappl 88 23635 0 23422 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 74 0 3 2 0 2 2 0 8 0 uaddrrnd 24 2191 0 2149 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2191 0 2149 1 0 1 1 0 8 0 vmmpekpl 168 16557 0 16522 2 0 2 2 0 8 0 vmmpepl 168 193423 0 191273 174 62 112 114 0 357 18 vmsppl 272 2190 0 2148 4 1 3 3 0 8 0 rwobjpl 24 50277 0 43469 42 0 42 42 0 8 0 pdppl 4096 4388 0 4319 107 36 71 71 0 8 2 pvpl 32 1011177 0 977172 299 18 281 281 0 265 4 pmappl 216 2190 0 2148 3 0 3 3 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 931 0 164 22 0 22 22 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(ffffffff8242c312) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249ce29,ffffffff82450f59,4f4,ffffffff82450f8c) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800677b180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806c6d6780,8f02728e000,8f02728f000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806c6d6780,fffffd80766f32a8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806c6d6780) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff500) 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(ffffffff8242c312) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249ce29,ffffffff82450f59,4f4,ffffffff82450f8c) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800677b180) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806c6d6780,8f02728e000,8f02728f000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806c6d6780,fffffd80766f32a8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c6d6780) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806c6d6780) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9