panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1269 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *225128 72554 0 0x14000 0x200 0K reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825ab66f) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261ef84,ffffffff825962d9,4f5,ffffffff825cca51) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd80075315a0) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8069c495c8,92fa7531000,92fa7730000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd8069c495c8,fffffd8065ddb400,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:1913 uvm_map_teardown(fffffd8069c495c8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8069c495c8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd8069c495c8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3480 reaper(ffff800021233268) at reaper+0x19a 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1269 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825ab66f) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261ef84,ffffffff825962d9,4f5,ffffffff825cca51) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd80075315a0) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8069c495c8,92fa7531000,92fa7730000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd8069c495c8,fffffd8065ddb400,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:1913 uvm_map_teardown(fffffd8069c495c8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8069c495c8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd8069c495c8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3480 reaper(ffff800021233268) at reaper+0x19a sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000212396f0 rbx 0xffffffff829d4b8f cpu_info_full_primary+0x2b8f rdx 0 rcx 0 rax 0xffff800021233268 r8 0x101010101010101 r9 0x8080808080808080 r10 0x88b06fa894c68be8 r11 0x77e37bd717bc3a56 r12 0xffffffff829d4990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff817a5ce8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212396e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (reaper) pid=225128 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021233508,0xffff800021232fd8 process=0xffff8000fffff608 user=0xffff800021234000, vmspace=0xffffffff829f5638 estcpu=36, cpticks=20, pctcpu=16.18 user=0, sys=3, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15395 155905 70416 0 3 0x82 wait syz-executor.0 76263 376993 70416 0 3 0x82 wait syz-executor.5 23447 437372 0 0 3 0x14280 nfsidl nfsio 2471 134442 0 0 3 0x14280 nfsidl nfsio 65861 319620 0 0 3 0x14280 nfsidl nfsio 74412 412343 0 0 3 0x14280 nfsidl nfsio 69760 440261 0 0 3 0x14280 nfsidl nfsio 52505 144088 0 0 3 0x14280 nfsidl nfsio 23145 441202 0 0 3 0x14280 nfsidl nfsio 11524 478379 0 0 3 0x14280 nfsidl nfsio 96622 444662 0 0 3 0x14280 nfsidl nfsio 18895 387277 0 0 3 0x14280 nfsidl nfsio 2323 268310 0 0 3 0x14280 nfsidl nfsio 5984 13104 0 0 3 0x14280 nfsidl nfsio 49261 269810 0 0 3 0x14280 nfsidl nfsio 91101 22538 0 0 3 0x14280 nfsidl nfsio 38236 220386 0 0 3 0x14280 nfsidl nfsio 87878 79231 0 0 3 0x14280 nfsidl nfsio 90319 507256 0 0 3 0x14280 nfsidl nfsio 69939 377743 0 0 3 0x14280 nfsidl nfsio 75817 500209 0 0 3 0x14280 nfsidl nfsio 56277 391978 0 0 3 0x14280 nfsidl nfsio 74248 459550 70416 0 3 0x82 wait syz-executor.7 3389 266788 0 0 3 0x14200 acct acct 87131 502728 70416 0 3 0x82 nanoslp syz-executor.2 58948 381153 70416 0 3 0x82 wait syz-executor.1 39241 478256 70416 0 3 0x82 nanoslp syz-executor.3 56091 381187 1 0 3 0x100083 ttyin getty 21678 1657 70416 0 3 0x82 nanoslp syz-executor.4 18239 297110 0 0 3 0x14200 bored sosplice 70416 339283 55125 0 3 0x82 thrsleep syz-fuzzer 70416 163871 55125 0 3 0x4000082 thrsleep syz-fuzzer 70416 310902 55125 0 3 0x4000082 thrsleep syz-fuzzer 70416 505010 55125 0 3 0x4000082 wait syz-fuzzer 70416 371648 55125 0 3 0x4000082 kqread syz-fuzzer 70416 39819 55125 0 3 0x4000082 wait syz-fuzzer 70416 419572 55125 0 3 0x4000082 thrsleep syz-fuzzer 70416 370414 55125 0 3 0x4000082 thrsleep syz-fuzzer 70416 286627 55125 0 3 0x4000082 thrsleep syz-fuzzer 70416 364635 55125 0 3 0x4000082 thrsleep syz-fuzzer 70416 397279 55125 0 3 0x4000082 wait syz-fuzzer 70416 234489 55125 0 3 0x4000082 wait syz-fuzzer 70416 475046 55125 0 3 0x4000082 wait syz-fuzzer 70416 384432 55125 0 3 0x4000082 wait syz-fuzzer 70416 215518 55125 0 3 0x4000082 wait syz-fuzzer 70416 133343 55125 0 3 0x4000082 thrsleep syz-fuzzer 70416 481332 55125 0 3 0x4000082 thrsleep syz-fuzzer 55125 405437 28222 0 3 0x10008a sigsusp ksh 28222 166569 3727 0 3 0x9a kqread sshd 3727 264575 1 0 3 0x88 kqread sshd 24591 94556 48629 74 3 0x1100092 bpf pflogd 48629 46791 1 0 3 0x80 netio pflogd 82898 440075 86042 73 2 0x1100010 syslogd 86042 326861 1 0 3 0x100082 netio syslogd 50672 290007 1 0 3 0x100080 kqread resolvd 25773 510432 31156 77 3 0x100092 kqread dhcpleased 88835 514236 31156 77 3 0x100092 kqread dhcpleased 31156 355484 1 0 3 0x80 kqread dhcpleased 67123 106270 0 0 3 0x14200 bored smr 40198 433137 0 0 2 0x14200 zerothread 13915 162374 0 0 3 0x14200 aiodoned aiodoned 83949 280238 0 0 3 0x14200 syncer update 52247 491143 0 0 3 0x14200 cleaner cleaner *72554 225128 0 0 7 0x14200 reaper 15170 503033 0 0 3 0x14200 pgdaemon pagedaemon 22718 447171 0 0 3 0x14200 bored viomb 45637 108639 0 0 3 0x40014200 acpi0 acpi0 51910 178276 0 0 7 0x40014200 idle1 67391 74462 0 0 3 0x14200 bored softnet 68252 113647 0 0 3 0x14200 bored softnet 65482 270438 0 0 3 0x14200 bored softnet 9704 19892 0 0 3 0x14200 bored softnet 84929 274541 0 0 3 0x14200 bored systqmp 96766 255175 0 0 3 0x14200 bored systq 61736 298952 0 0 3 0x40014200 bored softclock 98868 288144 0 0 3 0x40014200 idle0 1 507792 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff82bac968) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 uvm_fault_unwire_locked+0x21e sys/uvm/uvm_fault.c:1681 #4 uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:1913 #5 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] #5 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2562 #6 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3480 #7 reaper+0x19a sys/kern/kern_exit.c:448 #8 proc_trampoline+0x1c Process 82898 (syslogd) thread 0xffff8000ffff77b0 (440075) Process 72554 (reaper) thread 0xffff800021233268 (225128) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10256 6651K 7393K 78643K 101859 0 pcb 13 24K 34K 78643K 20469 0 rtable 211 20K 23K 78643K 17893 0 ifaddr 300 80K 82K 78643K 6490 0 sysctl 3 1K 5K 78643K 35 0 counters 56 35K 36K 78643K 2518 0 ioctlops 0 0K 4K 78643K 14151 0 iov 0 0K 28K 78643K 6537 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1540 96K 97K 78643K 30124 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 371 0 VM map 2 1K 1K 78643K 2 0 sem 12 36K 68K 78643K 48 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 9 29K 81K 78643K 54471 0 sigio 0 0K 0K 78643K 890 0 proc 73 91K 127K 78643K 8167 0 subproc 91 5K 8K 78643K 2693 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2697 0 in_multi 64 4K 6K 78643K 9603 0 ether_multi 2 0K 0K 78643K 612 0 mrt 4 0K 0K 78643K 1011 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 277 1235K 1235K 78643K 277 0 exec 0 0K 3K 78643K 13306 0 pfkey data 0 0K 0K 78643K 93 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 1196 3921K 3921K 78643K 301476 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1781 0 NDP 16 0K 1K 78643K 2571 0 temp 146 4735K 70271K 78643K 495381 0 kqueue 12 18K 30K 78643K 5122 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 3667 0 3664 50 49 1 5 0 8 0 rtentry 112 6190 0 6113 7 3 4 4 0 8 0 unpcb 144 78723 0 78708 567 564 3 12 0 8 2 syncache 296 13 0 13 5 5 0 1 0 8 0 tcpqe 32 94 0 94 3 3 0 1 0 8 0 tcpcb 768 17072 0 17068 654 648 6 19 0 8 5 arp 120 485 0 471 1 0 1 1 0 8 0 inpcb 368 60315 0 60308 907 903 4 20 0 8 3 nd6 48 1261 0 1245 1 0 1 1 0 8 0 pkpcb 40 353 0 353 24 24 0 1 0 8 0 kcovpl 48 203 0 196 1 0 1 1 0 8 0 ppxss 1256 757 0 757 92 92 0 1 0 8 0 pppxif 1704 308 0 308 41 41 0 1 0 8 0 pfstscr 40 15 0 15 4 4 0 1 0 8 0 pffrag 232 257 0 256 22 21 1 1 0 482 0 pffrnode 88 257 0 256 22 21 1 1 0 8 0 pffrent 40 1089 0 1088 24 23 1 1 0 8 0 pfosfp 40 1433 0 1009 5 0 5 5 0 8 0 pfosfpen 112 1433 0 714 21 0 21 21 0 8 0 pfrktable 1344 807 0 801 4 3 1 2 0 8 0 pfanchor 1280 215 0 4 18 0 18 18 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 109 0 107 1 0 1 1 0 8 0 pfstkey 120 133 0 131 1 0 1 1 0 8 0 pfstate 336 118 0 116 3 2 1 3 0 8 0 pfrule 1360 363 0 331 4 1 3 3 0 8 0 rttmr 136 171 0 171 12 12 0 1 0 8 0 art_heap8 4096 9 0 8 9 8 1 2 0 8 0 art_heap4 256 41598 0 41292 108 85 23 30 0 8 0 art_table 32 41607 0 41300 5 1 4 4 0 8 0 art_node 16 6136 0 6071 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 75106 0 73414 107 0 107 107 0 8 0 ffsino 272 75106 0 73414 114 0 114 114 0 8 0 nchpl 144 150560 0 150063 63 39 24 63 0 8 0 rtmask 32 27 0 27 11 11 0 1 0 8 0 uvmvnodes 80 11408 0 0 233 0 233 233 0 8 0 vnodes 216 11408 0 0 634 0 634 634 0 8 0 namei 1024 550940 0 550940 26 25 1 2 0 8 1 percpumem 16 1271 0 1231 1 0 1 1 0 8 0 vcpupl 2048 503 0 1 63 0 63 63 0 8 0 vmpool 568 647 0 145 38 2 36 36 0 8 0 pfiaddrpl 120 287 0 280 3 2 1 1 0 8 0 kstatmem 264 1622 0 1590 7 4 3 3 0 8 0 scsiplug 72 25 0 25 8 8 0 1 0 8 0 scxspl 216 452181 0 452181 43 42 1 8 0 8 1 plimitpl 152 6855 0 6839 1 0 1 1 0 8 0 sigapl 424 54479 0 54410 10 2 8 8 0 8 0 futexpl 64 565063 0 565063 19 18 1 1 0 8 1 knotepl 120 3156 0 0 15 1 14 14 0 8 0 kqueuepl 216 13037 0 13029 222 221 1 7 0 8 0 pipepl 320 10302 0 10277 305 301 4 13 0 8 0 fdescpl 496 54353 0 54331 10 6 4 5 0 8 0 filepl 152 424167 0 423949 736 723 13 27 0 8 1 lockfpl 104 21454 0 21452 34 33 1 4 0 8 0 lockfspl 48 5613 0 5611 1 0 1 1 0 8 0 sessionpl 144 224 0 207 1 0 1 1 0 8 0 pgrppl 48 556 0 539 1 0 1 1 0 8 0 ucredpl 104 39518 0 39504 1 0 1 1 0 8 0 zombiepl 144 54418 0 54410 4 3 1 1 0 8 0 processpl 1064 54479 0 54410 5 0 5 5 0 8 0 procpl 672 138757 0 138667 41 32 9 10 0 8 0 srpgc 96 223 0 223 65 65 0 1 0 8 0 sosppl 168 347 0 347 66 66 0 1 0 8 0 sockpl 488 143099 0 143074 2815 2804 11 42 0 8 7 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 30 0 0 2 0 2 2 0 8 0 mcl9k 9216 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 868 0 0 54 28 26 54 0 8 0 mtagpl 96 2933 0 0 27 9 18 20 0 8 0 mbufpl 256 9200 0 0 473 0 473 473 0 8 0 bufpl 288 88616 0 79977 816 72 744 815 0 8 0 anonpl 24 10489237 0 10468401 706 546 160 194 0 186 21 amapchunkpl 152 905477 0 904436 376 332 44 61 0 158 2 amappl16 200 157644 0 156739 516 455 61 62 0 8 10 amappl15 192 10580 0 10568 2 1 1 2 0 8 0 amappl14 184 7988 0 7984 1 0 1 1 0 8 0 amappl13 176 8575 0 8572 1 0 1 1 0 8 0 amappl12 168 7909 0 7903 2 1 1 1 0 8 0 amappl11 160 3268 0 3252 1 0 1 1 0 8 0 amappl10 152 5576 0 5562 1 0 1 1 0 8 0 amappl9 144 8860 0 8846 1 0 1 1 0 8 0 amappl8 136 12007 0 11767 11 2 9 9 0 8 0 amappl7 128 7522 0 7495 1 0 1 1 0 8 0 amappl6 120 9512 0 9477 5 3 2 2 0 8 0 amappl5 112 45601 0 45579 1 0 1 1 0 8 0 amappl4 104 13407 0 13362 3 1 2 2 0 8 0 amappl3 96 167225 0 167166 2 0 2 2 0 8 0 amappl2 88 66593 0 66510 3 0 3 3 0 8 0 amappl1 80 1285783 0 1284981 23 5 18 23 0 8 0 amappl 88 294197 0 293715 14 2 12 12 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 55001 0 54470 4 0 4 4 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 55001 0 54470 4 0 4 4 0 8 0 vmmpekpl 168 345367 0 345242 7 1 6 6 0 8 0 vmmpepl 168 5339356 0 5334981 1196 988 208 242 0 357 4 vmsppl 368 55000 0 54469 54 5 49 49 0 8 0 rwobjpl 56 1276620 0 1262489 258 55 203 203 0 8 0 pdppl 4096 110009 0 109440 2921 2350 571 571 0 8 2 pvpl 32 21103927 0 21075111 1513 1221 292 338 0 265 39 pmappl 248 55000 0 54469 38 4 34 34 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 5767 0 3573 64 1 63 63 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825ab66f) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261ef84,ffffffff825962d9,4f5,ffffffff825cca51) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd80075315a0) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd8069c495c8,92fa7531000,92fa7730000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd8069c495c8,fffffd8065ddb400,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:1913 uvm_map_teardown(fffffd8069c495c8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd8069c495c8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd8069c495c8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3480 reaper(ffff800021233268) at reaper+0x19a sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: -5