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 *183013 52566 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8242d3ad) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249dc15,ffffffff82452a5f,4f4,ffffffff82452a92) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd80061cdd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd8068880cc0,c1137b58000,c1137d57000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068880cc0,fffffd8067dbebd8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068880cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffed20) 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(ffffffff8242d3ad) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249dc15,ffffffff82452a5f,4f4,ffffffff82452a92) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd80061cdd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd8068880cc0,c1137b58000,c1137d57000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068880cc0,fffffd8067dbebd8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068880cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffed20) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002160e9f0 rbx 0xfffffd80061cdd00 rdx 0 rcx 0 rax 0xffff8000ffffed20 r8 0x101010101010101 r9 0x8080808080808080 r10 0x5f9bc9d52e64d53f r11 0x45f3e2e60c3815e r12 0 r13 0xffffffff827270c8 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff811baa68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002160e9e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=183013 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffea80,0xffff8000ffffefd0 process=0xffff8000ffffb390 user=0xffff800021609000, vmspace=0xffffffff8286c7f0 estcpu=36, cpticks=27, pctcpu=17.53 user=0, sys=367, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 15021 280372 13903 0 3 0x82 wait syz-executor.2 752 292969 1 0 3 0x100083 ttyin getty 26074 171644 13903 0 3 0x82 wait syz-executor.1 36717 278262 13903 0 2 0x482 syz-executor.0 92414 120908 0 0 3 0x14280 nfsidl nfsio 51451 293099 0 0 3 0x14280 nfsidl nfsio 4564 358014 0 0 3 0x14280 nfsidl nfsio 27486 358542 0 0 3 0x14280 nfsidl nfsio 65847 168151 0 0 3 0x14280 nfsidl nfsio 91702 337389 0 0 3 0x14280 nfsidl nfsio 85593 512509 0 0 3 0x14280 nfsidl nfsio 28818 98559 0 0 3 0x14280 nfsidl nfsio 70441 471584 0 0 3 0x14280 nfsidl nfsio 76046 364896 0 0 3 0x14280 nfsidl nfsio 899 341329 0 0 3 0x14280 nfsidl nfsio 86254 59096 0 0 3 0x14280 nfsidl nfsio 53250 424247 0 0 3 0x14280 nfsidl nfsio 90020 70150 0 0 3 0x14280 nfsidl nfsio 5139 399185 0 0 3 0x14280 nfsidl nfsio 21901 80055 0 0 3 0x14280 nfsidl nfsio 71336 223944 0 0 3 0x14280 nfsidl nfsio 71313 449008 0 0 3 0x14280 nfsidl nfsio 12840 128803 0 0 3 0x14280 nfsidl nfsio 72439 60508 0 0 3 0x14280 nfsidl nfsio 81096 56552 0 0 3 0x14200 bored sosplice 13903 435785 12903 0 3 0x82 thrsleep syz-fuzzer 13903 306812 12903 0 2 0x4000482 syz-fuzzer 13903 45911 12903 0 2 0x4000002 syz-fuzzer 13903 382238 12903 0 3 0x4000082 thrsleep syz-fuzzer 13903 370747 12903 0 3 0x4000082 thrsleep syz-fuzzer 13903 164037 12903 0 3 0x4000082 thrsleep syz-fuzzer 13903 502674 12903 0 3 0x4000082 thrsleep syz-fuzzer 12903 193200 34468 0 3 0x10008a sigsusp ksh 34468 173983 19559 0 3 0x9a poll sshd 19559 365348 1 0 3 0x88 poll sshd 60300 407919 12749 73 2 0x100010 syslogd 12749 519642 1 0 3 0x100082 netio syslogd 20270 415996 1 0 3 0x100080 kqread resolvd 24365 61168 88272 77 3 0x100092 kqread dhcpleased 36806 124335 88272 77 3 0x100092 kqread dhcpleased 88272 512958 1 0 3 0x80 kqread dhcpleased 73356 295620 0 0 3 0x14200 bored smr 56034 68015 0 0 2 0x14200 zerothread 47933 383685 0 0 3 0x14200 aiodoned aiodoned 14505 245641 0 0 2 0x14600 update 70367 443919 0 0 3 0x14200 cleaner cleaner *52566 183013 0 0 7 0x14200 reaper 43920 88939 0 0 3 0x14200 pgdaemon pagedaemon 85381 522704 0 0 3 0x14200 bored viomb 66195 499813 0 0 3 0x40014200 acpi0 acpi0 77993 435473 0 0 3 0x14200 bored softnet 9243 294205 0 0 2 0x14200 systqmp 78355 277306 0 0 2 0x14200 systq 57151 54303 0 0 2 0x40014200 softclock 67882 105853 0 0 3 0x40014200 idle0 1 376869 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 10142 6403K 7182K 78643K 14382 0 pcb 13 16K 18K 78643K 455 0 rtable 123 18K 20K 78643K 893 0 ifaddr 50 13K 15K 78643K 287 0 counters 21 16K 17K 78643K 52 0 ioctlops 0 0K 4K 78643K 451 0 iov 0 0K 28K 78643K 285 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1377 87K 87K 78643K 2533 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 17 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 380 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 49K 78643K 2082 0 sigio 0 0K 0K 78643K 3 0 proc 58 55K 79K 78643K 783 0 subproc 39 4K 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 82 0 in_multi 30 2K 3K 78643K 334 0 ether_multi 1 0K 0K 78643K 43 0 mrt 2 0K 0K 78643K 11 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 991 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 265 147K 160K 78643K 26175 0 UVM aobj 125 8K 8K 78643K 125 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 185 0 NDP 5 0K 1K 78643K 80 0 temp 88 4199K 4275K 78643K 26156 0 kqueue 10 14K 18K 78643K 98 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 120 171 0 168 3 2 1 3 0 8 0 rtentry 112 263 0 227 2 0 2 2 0 8 0 unpcb 136 2534 0 2521 24 23 1 6 0 8 0 syncache 296 15 0 15 6 6 0 1 0 8 0 tcpqe 32 50 0 50 2 2 0 1 0 8 0 tcpcb 736 966 0 961 49 47 2 13 0 8 0 arp 88 37 0 31 1 0 1 1 0 8 0 inpcb 304 2344 0 2336 41 35 6 11 0 8 5 rttmr 72 3 0 3 1 1 0 1 0 8 0 nd6 48 60 0 56 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 17 0 14 1 0 1 1 0 8 0 pffrag 232 11 0 11 1 1 0 1 0 482 0 pffrnode 88 11 0 11 1 1 0 1 0 8 0 pffrent 40 35 0 35 1 1 0 1 0 8 0 pfrktable 1344 34 0 21 3 1 2 2 0 8 0 pftag 88 12 0 8 2 1 1 1 0 8 0 pfrule 1360 96 0 32 7 1 6 6 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1090 0 926 25 12 13 18 0 8 0 art_table 32 1091 0 926 5 2 3 3 0 8 0 art_node 16 258 0 229 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 310 0 300 1 0 1 1 0 8 0 shmpl 112 122 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4712 0 3298 89 0 89 89 0 8 0 ffsino 240 4712 0 3298 84 0 84 84 0 8 0 nchpl 144 7935 0 6347 61 0 61 61 0 8 0 uvmvnodes 80 5578 0 0 114 0 114 114 0 8 0 vnodes 224 5578 0 0 329 0 329 329 0 8 0 namei 1024 31468 0 31467 3 2 1 1 0 8 0 vcpupl 1984 11 0 0 2 0 2 2 0 8 0 vmpool 528 56 0 45 1 0 1 1 0 8 0 pfiaddrpl 120 17 0 3 1 0 1 1 0 8 0 scxspl 216 22898 0 22898 12 11 1 8 0 8 1 plimitpl 152 512 0 502 1 0 1 1 0 8 0 sigapl 424 2281 0 2231 8 1 7 7 0 8 0 futexpl 64 22591 0 22591 1 0 1 1 0 8 1 knotepl 112 979 0 935 2 0 2 2 0 8 0 kqueuepl 184 359 0 350 4 3 1 2 0 8 0 pipepl 304 292 0 279 4 2 2 4 0 8 0 fdescpl 432 2247 0 2231 3 0 3 3 0 8 0 filepl 120 17318 0 17193 33 27 6 11 0 8 1 lockfpl 104 594 0 592 2 1 1 2 0 8 0 lockfspl 48 198 0 196 1 0 1 1 0 8 0 sessionpl 144 34 0 22 1 0 1 1 0 8 0 pgrppl 48 45 0 33 1 0 1 1 0 8 0 ucredpl 96 2210 0 2200 1 0 1 1 0 8 0 zombiepl 144 2231 0 2227 2 1 1 1 0 8 0 processpl 1000 2281 0 2227 7 0 7 7 0 8 0 procpl 672 5743 0 5677 12 6 6 8 0 8 0 sosppl 168 8 0 8 2 2 0 1 0 8 0 sockpl 448 5051 0 5025 87 76 11 19 0 8 7 mcl64k 65536 136 0 136 5 5 0 1 0 8 0 mcl16k 16384 14 0 14 3 3 0 1 0 8 0 mcl12k 12288 59 0 59 6 6 0 1 0 8 0 mcl9k 9216 20 0 20 5 5 0 1 0 8 0 mcl8k 8192 176 0 176 7 6 1 1 0 8 1 mcl4k 4096 316 0 316 5 4 1 1 0 8 1 mcl2k2 2112 27 0 27 8 8 0 1 0 8 0 mcl2k 2048 81119 0 81079 18 12 6 12 0 8 0 mtagpl 96 424 0 417 8 7 1 5 0 8 0 mbufpl 256 150592 0 150413 51 36 15 36 0 8 0 bufpl 288 8052 0 1636 459 0 459 459 0 8 0 anonpl 24 691109 0 670115 197 53 144 144 0 188 1 amapchunkpl 152 67705 0 66787 65 29 36 38 0 158 0 amappl16 200 9621 0 8864 78 35 43 53 0 8 0 amappl15 192 92 0 91 1 0 1 1 0 8 0 amappl14 184 75 0 72 1 0 1 1 0 8 0 amappl13 176 563 0 559 1 0 1 1 0 8 0 amappl12 168 57 0 56 1 0 1 1 0 8 0 amappl11 160 383 0 372 1 0 1 1 0 8 0 amappl10 152 500 0 492 1 0 1 1 0 8 0 amappl9 144 584 0 582 1 0 1 1 0 8 0 amappl8 136 974 0 931 2 0 2 2 0 8 0 amappl7 128 514 0 503 1 0 1 1 0 8 0 amappl6 120 337 0 321 1 0 1 1 0 8 0 amappl5 112 1770 0 1752 1 0 1 1 0 8 0 amappl4 104 1585 0 1561 1 0 1 1 0 8 0 amappl3 96 669 0 651 1 0 1 1 0 8 0 amappl2 88 1013 0 972 2 0 2 2 0 8 0 amappl1 80 43961 0 43466 12 1 11 12 0 8 0 amappl 88 25609 0 25416 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 72 124 0 0 3 0 3 3 0 8 0 uaddrrnd 24 2303 0 2273 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2303 0 2273 1 0 1 1 0 8 0 vmmpekpl 168 20102 0 20065 4 1 3 3 0 8 0 vmmpepl 168 219426 0 217164 214 102 112 124 0 357 10 vmsppl 272 2302 0 2272 4 1 3 3 0 8 0 rwobjpl 24 60941 0 53658 44 0 44 44 0 8 0 pdppl 4096 4612 0 4555 103 44 59 61 0 8 2 pvpl 32 1232243 0 1207131 310 74 236 242 0 265 10 pmappl 216 2302 0 2272 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1006 0 251 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(ffffffff8242d3ad) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249dc15,ffffffff82452a5f,4f4,ffffffff82452a92) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd80061cdd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd8068880cc0,c1137b58000,c1137d57000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068880cc0,fffffd8067dbebd8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068880cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffed20) 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(ffffffff8242d3ad) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249dc15,ffffffff82452a5f,4f4,ffffffff82452a92) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd80061cdd00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd8068880cc0,c1137b58000,c1137d57000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd8068880cc0,fffffd8067dbebd8,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8068880cc0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd8068880cc0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffed20) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9