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 *492031 90476 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257b23e) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eeeb0,ffffffff825a3034,4f5,ffffffff825a3067) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005da7c80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c1dbab0,2a8f28d4000,2a8f28d5000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806c1dbab0,fffffd806bc48408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd806c1dbab0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 reaper(ffff8000ffff9508) 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(ffffffff8257b23e) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eeeb0,ffffffff825a3034,4f5,ffffffff825a3067) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005da7c80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c1dbab0,2a8f28d4000,2a8f28d5000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806c1dbab0,fffffd806bc48408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd806c1dbab0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 reaper(ffff8000ffff9508) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000216c06b0 rbx 0xfffffd8005da7c80 rdx 0 rcx 0 rax 0xffff8000ffff9508 r8 0x101010101010101 r9 0x8080808080808080 r10 0xe48db051cb30ae09 r11 0xe3dcb3ca4dbd5450 r12 0 r13 0xffff8000216c07d8 r14 0 r15 0x1 rip 0xffffffff8158fb38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216c06a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=492031 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffffce0,0xffff8000ffff8a98 process=0xffff8000ffffa008 user=0xffff8000216bb000, vmspace=0xffffffff82a22528 estcpu=36, cpticks=71, pctcpu=19.66 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 41219 374990 16096 0 3 0x80 nanoslp syz-executor.3 41219 267034 16096 0 3 0x4000080 fsleep syz-executor.3 34991 134146 0 0 3 0x14200 bored sosplice 16096 107461 33324 0 2 0x482 syz-executor.3 33324 370739 59193 0 3 0x82 wait syz-fuzzer 33324 406169 59193 0 3 0x4000082 thrsleep syz-fuzzer 33324 9943 59193 0 3 0x4000082 wait syz-fuzzer 33324 415509 59193 0 3 0x4000082 thrsleep syz-fuzzer 33324 46198 59193 0 3 0x4000082 thrsleep syz-fuzzer 33324 326512 59193 0 3 0x4000082 wait syz-fuzzer 33324 436875 59193 0 3 0x4000082 wait syz-fuzzer 33324 391816 59193 0 3 0x4000082 thrsleep syz-fuzzer 33324 22816 59193 0 3 0x4000082 wait syz-fuzzer 33324 235629 59193 0 3 0x4000082 wait syz-fuzzer 33324 56213 59193 0 3 0x4000082 wait syz-fuzzer 33324 400507 59193 0 3 0x4000082 wait syz-fuzzer 33324 221978 59193 0 3 0x4000082 thrsleep syz-fuzzer 33324 198262 59193 0 3 0x4000082 kqread syz-fuzzer 59193 47848 75560 0 3 0x10008a sigsusp ksh 75560 255261 70265 0 3 0x9a kqread sshd 20013 350074 1 0 3 0x100083 ttyin getty 70265 205812 1 0 3 0x88 kqread sshd 54174 521507 39896 73 2 0x1100010 syslogd 39896 179359 1 0 3 0x100082 netio syslogd 12498 269574 1 0 3 0x100080 kqread resolvd 56691 348653 24607 77 3 0x100092 kqread dhcpleased 83172 348416 24607 77 3 0x100092 kqread dhcpleased 24607 328825 1 0 3 0x80 kqread dhcpleased 83743 182606 0 0 3 0x14200 bored smr 34969 382675 0 0 2 0x14200 zerothread 9767 464680 0 0 3 0x14200 aiodoned aiodoned 36557 325571 0 0 3 0x14200 syncer update 86980 450654 0 0 3 0x14200 cleaner cleaner *90476 492031 0 0 7 0x14200 reaper 47556 238134 0 0 3 0x14200 pgdaemon pagedaemon 12257 343553 0 0 3 0x14200 bored viomb 5867 356918 0 0 3 0x40014200 acpi0 acpi0 31594 100699 0 0 3 0x14200 bored softnet 55493 489659 0 0 3 0x14200 bored softnet 35736 479751 0 0 3 0x14200 bored softnet 12567 44260 0 0 3 0x14200 bored softnet 94081 15202 0 0 3 0x14200 bored systqmp 83344 5722 0 0 3 0x14200 bored systq 63431 164076 0 0 3 0x40014200 bored softclock 54528 55437 0 0 3 0x40014200 idle0 1 404717 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 10171 6397K 6724K 78643K 11415 0 pcb 13 8K 8K 78643K 33 0 rtable 175 6K 8K 78643K 362 0 ifaddr 66 14K 18K 78643K 143 0 counters 25 17K 17K 78643K 47 0 ioctlops 0 0K 4K 78643K 53 0 iov 0 0K 0K 78643K 4 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 80K 78643K 1348 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 8 25K 65K 78643K 387 0 proc 56 58K 75K 78643K 451 0 subproc 65 4K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 48 0 in_multi 66 4K 6K 78643K 116 0 ether_multi 1 0K 0K 78643K 10 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 61 281K 281K 78643K 61 0 exec 0 0K 2K 78643K 618 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 221 89K 89K 78643K 3266 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 35 0 NDP 9 0K 2K 78643K 41 0 temp 79 4716K 4781K 78643K 4283 0 kqueue 12 18K 26K 78643K 42 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 40 0 37 1 0 1 1 0 8 0 rtentry 112 111 0 34 4 0 4 4 0 8 0 unpcb 144 144 0 131 1 0 1 1 0 8 0 syncache 296 11 0 11 1 1 0 1 0 8 0 tcpqe 32 14 0 14 2 2 0 1 0 8 0 tcpcb 768 75 0 71 4 3 1 4 0 8 0 arp 88 18 0 6 1 0 1 1 0 8 0 inpcb 336 208 0 201 2 1 1 2 0 8 0 nd6 48 24 0 9 1 0 1 1 0 8 0 kcovpl 48 8 0 3 1 0 1 1 0 8 0 ppxss 1160 16 0 16 2 2 0 1 0 8 0 pfrktable 1344 3 0 1 1 0 1 1 0 8 0 pfanchor 1280 1 0 0 1 0 1 1 0 8 0 pfrule 1360 4 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 132 29 0 29 29 0 8 3 art_table 32 453 0 132 4 0 4 4 0 8 0 art_node 16 110 0 40 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1835 0 403 90 0 90 90 0 8 0 ffsino 240 1835 0 403 85 0 85 85 0 8 0 nchpl 144 2369 0 695 63 0 63 63 0 8 0 uvmvnodes 80 1969 0 0 41 0 41 41 0 8 0 vnodes 216 1969 0 0 110 0 110 110 0 8 0 namei 1024 7347 0 7347 6 5 1 2 0 8 1 pfiaddrpl 120 4 0 0 1 0 1 1 0 8 0 kstatmem 264 50 0 32 2 0 2 2 0 8 0 scxspl 216 8225 0 8225 9 8 1 8 0 8 1 plimitpl 152 65 0 47 1 0 1 1 0 8 0 sigapl 424 676 0 630 6 0 6 6 0 8 0 futexpl 64 1657 0 1656 4 3 1 1 0 8 0 knotepl 120 12271 0 12205 3 0 3 3 0 8 0 kqueuepl 184 38 0 30 1 0 1 1 0 8 0 pipepl 288 131 0 110 5 3 2 3 0 8 0 fdescpl 432 659 0 640 4 0 4 4 0 8 0 filepl 120 2395 0 2223 8 0 8 8 0 8 0 lockfpl 104 26 0 24 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 104 289 0 279 1 0 1 1 0 8 0 zombiepl 144 644 0 630 1 0 1 1 0 8 0 processpl 1000 676 0 630 7 1 6 6 0 8 0 procpl 672 975 0 907 6 0 6 6 0 8 0 sosppl 168 4 0 4 1 1 0 1 0 8 0 sockpl 456 392 0 369 7 4 3 5 0 8 0 mcl8k 8192 8 0 8 1 1 0 1 0 8 0 mcl4k 4096 5 0 5 2 2 0 1 0 8 0 mcl2k 2048 18522 0 18452 19 7 12 16 0 8 1 mtagpl 96 17 0 17 2 2 0 1 0 8 0 mbufpl 256 34894 0 34732 21 2 19 21 0 8 4 bufpl 288 5510 0 132 385 0 385 385 0 8 0 anonpl 24 174186 0 140651 212 9 203 203 0 188 0 amapchunkpl 152 12687 0 10628 87 7 80 80 0 158 0 amappl16 200 883 0 683 13 2 11 11 0 8 0 amappl15 192 96 0 86 1 0 1 1 0 8 0 amappl14 184 54 0 50 1 0 1 1 0 8 0 amappl13 176 121 0 117 1 0 1 1 0 8 0 amappl12 168 53 0 46 1 0 1 1 0 8 0 amappl11 160 78 0 65 1 0 1 1 0 8 0 amappl10 152 67 0 60 1 0 1 1 0 8 0 amappl9 144 1037 0 1021 1 0 1 1 0 8 0 amappl8 136 580 0 537 2 0 2 2 0 8 0 amappl7 128 113 0 100 1 0 1 1 0 8 0 amappl6 120 312 0 289 2 1 1 2 0 8 0 amappl5 112 338 0 321 1 0 1 1 0 8 0 amappl4 104 812 0 789 2 1 1 2 0 8 0 amappl3 96 1363 0 1296 2 0 2 2 0 8 0 amappl2 88 748 0 681 3 1 2 3 0 8 0 amappl1 80 17457 0 16682 21 5 16 21 0 8 0 amappl 88 2831 0 2677 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 659 0 631 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 659 0 631 1 0 1 1 0 8 0 vmmpekpl 168 9889 0 9841 3 0 3 3 0 8 0 vmmpepl 168 64323 0 61873 114 7 107 107 0 357 0 vmsppl 272 658 0 630 3 1 2 2 0 8 0 rwobjpl 24 18768 0 15494 20 0 20 20 0 8 0 pdppl 4096 1324 0 1260 102 38 64 64 0 8 0 pvpl 32 425892 0 385525 404 15 389 394 0 265 63 pmappl 216 658 0 630 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 758 0 62 21 0 21 21 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(ffffffff8257b23e) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eeeb0,ffffffff825a3034,4f5,ffffffff825a3067) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005da7c80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c1dbab0,2a8f28d4000,2a8f28d5000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806c1dbab0,fffffd806bc48408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd806c1dbab0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 reaper(ffff8000ffff9508) 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(ffffffff8257b23e) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825eeeb0,ffffffff825a3034,4f5,ffffffff825a3067) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005da7c80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd806c1dbab0,2a8f28d4000,2a8f28d5000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd806c1dbab0,fffffd806bc48408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806c1dbab0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd806c1dbab0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 reaper(ffff8000ffff9508) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9