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 *204818 29510 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82573838) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea767,ffffffff82598a90,4f5,ffffffff82598ac3) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006065c00) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c4c1890,9b1bd11000,9b1bf10000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd806c4c1890,fffffd8067ea5708,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd806c4c1890) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 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(ffffffff82573838) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea767,ffffffff82598a90,4f5,ffffffff82598ac3) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006065c00) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c4c1890,9b1bd11000,9b1bf10000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd806c4c1890,fffffd8067ea5708,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd806c4c1890) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 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 0xffff8000216c02f0 rbx 0xfffffd8006065c00 rdx 0 rcx 0 rax 0xffff8000ffff9ce8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x26caa2407c0c9d0 r11 0x9000bdbec6711ac3 r12 0 r13 0xffff8000216c0418 r14 0 r15 0x1 rip 0xffffffff81c1c738 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216c02e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=204818 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffff500,0xffff8000ffff9a58 process=0xffff8000ffffa008 user=0xffff8000216bb000, vmspace=0xffffffff82a5bf98 estcpu=36, cpticks=51, pctcpu=20.18 user=0, sys=159, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 77761 263497 0 0 3 0x14200 bored sosplice 49949 267630 0 0 3 0x14200 acct acct 96311 9542 31665 0 3 0x82 wait syz-fuzzer 96311 118733 31665 0 2 0x4000482 syz-fuzzer 96311 414245 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 514426 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 317940 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 452194 31665 0 3 0x4000082 wait syz-fuzzer 96311 174015 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 372197 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 136974 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 81959 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 185234 31665 0 3 0x4000082 thrsleep syz-fuzzer 96311 106129 31665 0 3 0x4000082 wait syz-fuzzer 96311 101624 31665 0 3 0x4000082 wait syz-fuzzer 96311 83268 31665 0 2 0x4000002 syz-fuzzer 31665 379939 14187 0 3 0x10008a sigsusp ksh 14187 305956 4954 0 3 0x9a kqread sshd 79706 405961 1 0 3 0x100083 ttyin getty 4954 21202 1 0 3 0x88 kqread sshd 51617 21143 74300 73 2 0x1100010 syslogd 74300 122701 1 0 3 0x100082 netio syslogd 48448 469050 1 0 3 0x100080 kqread resolvd 93146 131727 47293 77 3 0x100092 kqread dhcpleased 90225 518177 47293 77 3 0x100092 kqread dhcpleased 47293 224683 1 0 3 0x80 kqread dhcpleased 17549 392060 0 0 2 0x14200 smr 19875 127921 0 0 2 0x14200 zerothread 82013 227106 0 0 3 0x14200 aiodoned aiodoned 52765 443812 0 0 2 0x14600 update 8137 42558 0 0 3 0x14200 cleaner cleaner *29510 204818 0 0 7 0x14200 reaper 61842 521926 0 0 3 0x14200 pgdaemon pagedaemon 73080 366535 0 0 3 0x14200 bored viomb 5715 224349 0 0 3 0x40014200 acpi0 acpi0 29632 427220 0 0 3 0x14200 bored softnet 35771 465669 0 0 3 0x14200 bored softnet 50977 77315 0 0 3 0x14200 bored softnet 62362 52279 0 0 2 0x14200 softnet 86042 486124 0 0 2 0x14200 systqmp 27872 244883 0 0 3 0x14200 bored systq 11540 312080 0 0 2 0x40014200 softclock 92241 368862 0 0 3 0x40014200 idle0 1 279953 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 10155 6387K 7693K 78643K 12706 0 pcb 13 8K 8K 78643K 126 0 rtable 80 2K 6K 78643K 637 0 ifaddr 41 11K 19K 78643K 229 0 counters 20 16K 17K 78643K 41 0 ioctlops 0 0K 4K 78643K 154 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 1936 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 12 1K 1K 78643K 12 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 3 5K 65K 78643K 1725 0 sigio 0 0K 0K 78643K 10 0 proc 58 59K 107K 78643K 784 0 subproc 13 0K 6K 78643K 221 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 34 0 in_multi 22 1K 6K 78643K 198 0 ether_multi 1 0K 0K 78643K 15 0 mrt 0 0K 0K 78643K 28 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 109 493K 493K 78643K 109 0 exec 0 0K 2K 78643K 871 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 187 68K 107K 78643K 9716 0 UVM aobj 31 2K 2K 78643K 31 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 78 0 NDP 4 0K 2K 78643K 59 0 temp 67 4707K 4772K 78643K 8431 0 kqueue 12 18K 26K 78643K 147 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 112 210 0 177 7 3 4 4 0 8 1 unpcb 144 518 0 505 2 1 1 2 0 8 0 syncache 296 35 0 35 1 1 0 1 0 8 0 tcpcb 768 324 0 320 8 7 1 7 0 8 0 arp 88 36 0 32 1 0 1 1 0 8 0 ipq 40 3 0 3 1 1 0 1 0 8 0 ipqe 40 12 0 12 1 1 0 1 0 8 0 inpcb 336 728 0 721 4 3 1 2 0 8 0 nd6 48 51 0 48 2 1 1 1 0 8 0 kcovpl 48 17 0 16 2 1 1 1 0 8 0 ppxss 1160 5 0 5 1 1 0 1 0 8 0 pfstscr 40 22 0 21 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 264 4 0 4 1 1 0 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 120 22 0 21 1 0 1 1 0 8 0 pfstate 336 22 0 21 1 0 1 1 0 8 0 pfrule 1360 20 0 20 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 860 0 712 51 30 21 29 0 8 8 art_table 32 861 0 712 7 3 4 4 0 8 1 art_node 16 209 0 179 1 0 1 1 0 8 0 sysvmsgpl 40 82 0 66 2 1 1 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 28 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3667 0 2238 91 0 91 91 0 8 0 ffsino 240 3667 0 2238 85 0 85 85 0 8 0 nchpl 144 5839 0 4198 63 1 62 63 0 8 0 uvmvnodes 80 4260 0 0 87 0 87 87 0 8 0 vnodes 216 4260 0 0 237 0 237 237 0 8 0 namei 1024 16886 0 16886 10 9 1 2 0 8 1 kstatmem 264 50 0 42 3 1 2 2 0 8 0 scxspl 216 21926 0 21926 9 8 1 8 0 8 1 plimitpl 152 89 0 76 1 0 1 1 0 8 0 sigapl 424 1990 0 1951 6 0 6 6 0 8 0 futexpl 64 10673 0 10673 3 3 0 1 0 8 0 knotepl 120 19003 0 18939 11 8 3 11 0 8 0 kqueuepl 184 177 0 169 1 0 1 1 0 8 0 pipepl 288 182 0 162 5 3 2 3 0 8 0 fdescpl 432 1972 0 1958 6 3 3 4 0 8 1 filepl 120 6403 0 6291 12 4 8 9 0 8 0 lockfpl 104 228 0 226 1 0 1 1 0 8 0 lockfspl 48 115 0 113 1 0 1 1 0 8 0 sessionpl 144 32 0 17 1 0 1 1 0 8 0 pgrppl 48 32 0 17 1 0 1 1 0 8 0 ucredpl 104 915 0 905 1 0 1 1 0 8 0 zombiepl 144 1959 0 1951 1 0 1 1 0 8 0 processpl 1000 1990 0 1951 7 1 6 6 0 8 0 procpl 672 3702 0 3646 9 3 6 7 0 8 0 sosppl 168 26 0 26 4 4 0 1 0 8 0 sockpl 456 1318 0 1295 9 6 3 7 0 8 0 mcl16k 16384 7 0 7 1 1 0 1 0 8 0 mcl9k 9216 22 0 22 1 1 0 1 0 8 0 mcl8k 8192 8 0 8 1 1 0 1 0 8 0 mcl4k 4096 29 0 29 1 1 0 1 0 8 0 mcl2k 2048 11540 0 11475 28 15 13 15 0 8 1 mtagpl 96 208 0 208 6 6 0 5 0 8 0 mbufpl 256 41110 0 40944 32 16 16 29 0 8 0 bufpl 288 11815 0 4911 494 0 494 494 0 8 0 anonpl 24 458060 0 434743 471 181 290 419 0 188 142 amapchunkpl 152 34348 0 32941 167 37 130 164 0 158 71 amappl16 200 4797 0 4626 21 9 12 16 0 8 0 amappl15 192 477 0 471 1 0 1 1 0 8 0 amappl14 184 403 0 399 1 0 1 1 0 8 0 amappl13 176 333 0 329 1 0 1 1 0 8 0 amappl12 168 20 0 17 1 0 1 1 0 8 0 amappl11 160 90 0 76 1 0 1 1 0 8 0 amappl10 152 17 0 14 1 0 1 1 0 8 0 amappl9 144 673 0 670 1 0 1 1 0 8 0 amappl8 136 1251 0 1202 2 0 2 2 0 8 0 amappl7 128 711 0 691 1 0 1 1 0 8 0 amappl6 120 421 0 410 2 1 1 2 0 8 0 amappl5 112 1164 0 1153 1 0 1 1 0 8 0 amappl4 104 1211 0 1184 2 1 1 2 0 8 0 amappl3 96 4880 0 4828 3 1 2 3 0 8 0 amappl2 88 704 0 668 2 0 2 2 0 8 0 amappl1 80 48003 0 47447 20 5 15 19 0 8 0 amappl 88 9079 0 8961 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 30 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1972 0 1953 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1972 0 1953 1 0 1 1 0 8 0 vmmpekpl 168 16132 0 16090 3 0 3 3 0 8 0 vmmpepl 168 185472 0 183820 124 28 96 107 0 357 2 vmsppl 272 1971 0 1952 3 1 2 2 0 8 0 rwobjpl 24 48450 0 43084 34 0 34 34 0 8 0 pdppl 4096 3950 0 3904 117 62 55 64 0 8 9 pvpl 32 1031758 0 1003840 986 449 537 764 0 265 265 pmappl 216 1971 0 1952 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 932 0 145 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(ffffffff82573838) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea767,ffffffff82598a90,4f5,ffffffff82598ac3) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006065c00) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c4c1890,9b1bd11000,9b1bf10000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd806c4c1890,fffffd8067ea5708,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd806c4c1890) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 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(ffffffff82573838) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea767,ffffffff82598a90,4f5,ffffffff82598ac3) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8006065c00) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c4c1890,9b1bd11000,9b1bf10000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1681 uvm_unmap_kill_entry_withlock(fffffd806c4c1890,fffffd8067ea5708,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c4c1890) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd806c4c1890) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3436 reaper(ffff8000ffff9ce8) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9