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 *122927 94951 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82574758) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5f6,ffffffff8259f328,4f5,ffffffff8259f35b) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800649e780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680efaa0,b93cd391000,b93cd590000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd80680efaa0,fffffd80769ad348,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd80680efaa0) 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(ffffffff82574758) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5f6,ffffffff8259f328,4f5,ffffffff8259f35b) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800649e780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680efaa0,b93cd391000,b93cd590000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd80680efaa0,fffffd80769ad348,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd80680efaa0) 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 0xffff8000216bfe20 rbx 0xfffffd800649e780 rdx 0 rcx 0 rax 0xffff8000ffff9ce8 r8 0x101010101010101 r9 0x8080808080808080 r10 0xfcd5959509e51c28 r11 0x502455680868841b r12 0 r13 0xffff8000216bff48 r14 0 r15 0x1 rip 0xffffffff824ed858 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216bfe10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=122927 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffffce0,0xffff8000ffff8fd8 process=0xffff8000ffffa008 user=0xffff8000216bb000, vmspace=0xffffffff829da6b0 estcpu=36, cpticks=6, pctcpu=12.78 user=0, sys=365, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 37001 352209 56424 0 3 0x82 piperd syz-executor.1 14934 294549 56424 0 3 0x82 piperd syz-executor.4 6097 199988 73750 0 3 0x100082 netio arp 73750 306909 1 0 3 0x10008a sigsusp sh 10782 484914 56424 0 3 0x82 piperd syz-executor.6 71200 209149 1 0 4 0x82000 syz-executor.0 71200 521910 1 0 2 0x4082000 syz-executor.0 71200 486215 1 0 3 0x4002000 suspend syz-executor.0 89453 344914 56424 0 3 0x82 piperd syz-executor.7 23390 291965 1 0 3 0x3000 suspend syz-executor.0 23390 459241 1 0 2 0x4081000 syz-executor.0 62497 220072 1 0 3 0x100083 ttyin getty 48531 20878 0 0 3 0x14200 acct acct 8337 3195 0 0 3 0x14280 nfsidl nfsio 76748 174875 0 0 3 0x14200 bored sosplice 56424 88780 69936 0 3 0x82 thrsleep syz-fuzzer 56424 99926 69936 0 2 0x4000482 syz-fuzzer 56424 360832 69936 0 3 0x4000082 wait syz-fuzzer 56424 31251 69936 0 2 0x4000482 syz-fuzzer 56424 420130 69936 0 3 0x4000082 wait syz-fuzzer 56424 154153 69936 0 3 0x4000082 thrsleep syz-fuzzer 56424 30441 69936 0 3 0x4000082 thrsleep syz-fuzzer 56424 161469 69936 0 3 0x4000082 wait syz-fuzzer 56424 476414 69936 0 3 0x4000082 thrsleep syz-fuzzer 56424 291608 69936 0 3 0x4000082 wait syz-fuzzer 56424 320584 69936 0 3 0x4000082 wait syz-fuzzer 56424 338093 69936 0 3 0x4000082 wait syz-fuzzer 56424 96945 69936 0 3 0x4000082 wait syz-fuzzer 56424 129645 69936 0 3 0x4000082 wait syz-fuzzer 69936 91930 51986 0 3 0x10008a sigsusp ksh 51986 271209 97055 0 3 0x9a kqread sshd 97055 164731 1 0 3 0x88 kqread sshd 63194 474024 17598 73 2 0x1100010 syslogd 17598 500312 1 0 3 0x100082 netio syslogd 62206 459537 1 0 3 0x100080 kqread resolvd 89018 152681 48850 77 3 0x100092 kqread dhcpleased 52724 88964 48850 77 3 0x100092 kqread dhcpleased 48850 237222 1 0 3 0x80 kqread dhcpleased 84173 109798 0 0 3 0x14200 bored smr 51999 500111 0 0 2 0x14200 zerothread 17513 49861 0 0 3 0x14200 aiodoned aiodoned 60393 278336 0 0 2 0x14600 update 60952 510977 0 0 3 0x14200 cleaner cleaner *94951 122927 0 0 7 0x14200 reaper 83434 195561 0 0 3 0x14200 pgdaemon pagedaemon 46411 185502 0 0 3 0x14200 bored viomb 52936 211198 0 0 3 0x40014200 acpi0 acpi0 31602 49659 0 0 3 0x14200 bored softnet 1607 131854 0 0 3 0x14200 bored softnet 98919 498616 0 0 3 0x14200 bored softnet 89509 405678 0 0 3 0x14200 bored softnet 69072 517336 0 0 2 0x14200 systqmp 68547 216262 0 0 3 0x14200 bored systq 59916 195462 0 0 2 0x40014200 softclock 76599 105741 0 0 3 0x40014200 idle0 1 98655 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 10217 6431K 7860K 78643K 35981 0 pcb 13 18K 20K 78643K 2663 0 rtable 227 24K 27K 78643K 9383 0 ifaddr 181 44K 46K 78643K 4672 0 sysctl 3 1K 1K 78643K 3 0 counters 26 17K 17K 78643K 296 0 ioctlops 0 0K 4K 78643K 6201 0 iov 0 0K 28K 78643K 1430 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1470 92K 92K 78643K 13623 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 130 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 817 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 10 33K 89K 78643K 14882 0 sigio 0 0K 0K 78643K 235 0 proc 63 59K 83K 78643K 2628 0 subproc 91 5K 7K 78643K 845 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1235 0 in_multi 68 4K 7K 78643K 880 0 ether_multi 1 0K 0K 78643K 62 0 mrt 1 0K 0K 78643K 51 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 253 1129K 1129K 78643K 253 0 exec 0 0K 2K 78643K 5284 0 pfkey data 0 0K 0K 78643K 5 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 414 637K 644K 78643K 84498 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 447 0 NDP 13 0K 2K 78643K 360 0 temp 137 4726K 5750K 78643K 119293 0 kqueue 12 18K 28K 78643K 974 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 1113 0 1109 14 13 1 3 0 8 0 rtentry 112 861 0 790 5 2 3 4 0 8 0 unpcb 144 8598 0 8585 100 99 1 6 0 8 0 syncache 296 92 0 92 23 23 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 25 0 25 8 8 0 1 0 8 0 tcpcb 768 11976 0 11972 272 271 1 19 0 8 0 arp 88 141 0 128 1 0 1 1 0 8 0 inpcb 336 24454 0 24447 237 236 1 18 0 8 0 ip6q 72 4 0 4 2 2 0 1 0 8 0 ip6af 40 7 0 7 2 2 0 1 0 8 0 nd6 48 210 0 195 1 0 1 1 0 8 0 pkpcb 40 13 0 13 3 3 0 1 0 8 0 kcovpl 48 65 0 58 1 0 1 1 0 8 0 ppxss 1160 142 0 142 17 17 0 1 0 8 0 pfstscr 40 9 0 7 2 1 1 1 0 8 0 pfosfp 40 4 0 2 1 0 1 1 0 8 0 pfosfpen 112 4 0 2 1 0 1 1 0 8 0 pfrke_plain 168 5 0 5 1 1 0 1 0 8 0 pfrktable 1344 3022 0 2999 3 0 3 3 0 8 0 pfanchor 1280 318 0 190 14 0 14 14 0 8 0 pftag 88 13 0 5 1 0 1 1 0 8 0 pfqueue 264 67 0 67 1 1 0 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 120 12 0 10 2 1 1 1 0 8 0 pfstate 336 6 0 5 2 1 1 1 0 8 0 pfrule 1360 1765 0 1527 20 0 20 20 0 8 0 rttmr 136 16 0 16 5 5 0 1 0 8 0 art_heap8 4096 4 0 3 4 3 1 3 0 8 0 art_heap4 256 3585 0 3268 71 45 26 31 0 8 3 art_table 32 3589 0 3271 5 1 4 4 0 8 1 art_node 16 846 0 785 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 0 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 777 0 767 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 23991 0 22529 92 0 92 92 0 8 0 ffsino 240 23991 0 22529 87 0 87 87 0 8 0 nchpl 144 42939 0 42455 63 40 23 63 0 8 0 rtmask 32 20 0 20 6 6 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 158662 0 158662 23 23 0 2 0 8 0 vcpupl 2048 41 0 0 6 0 6 6 0 8 0 vmpool 536 51 0 10 3 0 3 3 0 8 0 pfiaddrpl 120 1826 0 1616 7 0 7 7 0 8 0 kstatmem 264 450 0 424 19 16 3 3 0 8 0 scsiplug 72 8 0 8 3 3 0 1 0 8 0 scxspl 216 120844 0 120844 31 30 1 8 0 8 1 plimitpl 152 2001 0 1983 1 0 1 1 0 8 0 sigapl 424 15091 0 15045 10 3 7 8 0 8 0 futexpl 64 167523 0 167523 8 8 0 1 0 8 0 knotepl 120 154180 0 154102 85 81 4 11 0 8 0 kqueuepl 184 4009 0 4001 37 36 1 6 0 8 0 pipepl 288 2832 0 2805 63 60 3 11 0 8 0 fdescpl 432 15032 0 15011 4 0 4 4 0 8 0 filepl 120 113655 0 113438 130 122 8 16 0 8 0 lockfpl 104 2996 0 2994 5 4 1 2 0 8 0 lockfspl 48 806 0 804 1 0 1 1 0 8 0 sessionpl 144 84 0 67 1 0 1 1 0 8 0 pgrppl 48 190 0 173 1 0 1 1 0 8 0 ucredpl 104 14653 0 14643 1 0 1 1 0 8 0 zombiepl 144 15052 0 15045 4 3 1 1 0 8 0 processpl 1000 15091 0 15045 12 4 8 9 0 8 0 procpl 672 40700 0 40634 42 35 7 10 0 8 0 sosppl 168 104 0 104 20 20 0 1 0 8 0 sockpl 456 34212 0 34188 621 617 4 29 0 8 0 mcl64k 65536 492 0 492 30 30 0 1 0 8 0 mcl16k 16384 157 0 157 33 33 0 1 0 8 0 mcl12k 12288 385 0 385 31 31 0 1 0 8 0 mcl9k 9216 204 0 204 39 39 0 1 0 8 0 mcl8k 8192 1011 0 1011 20 20 0 1 0 8 0 mcl4k 4096 3380 0 3380 14 14 0 1 0 8 0 mcl2k2 2112 145 0 145 34 34 0 1 0 8 0 mcl2k 2048 99730 0 99663 43 33 10 19 0 8 0 mtagpl 96 4801 0 4801 44 44 0 20 0 8 0 mbufpl 256 323665 0 323403 959 932 27 441 0 8 0 bufpl 288 26468 0 20053 459 0 459 459 0 8 0 anonpl 24 3165229 0 3140386 317 167 150 150 0 188 0 amapchunkpl 152 244275 0 243290 86 48 38 44 0 158 0 amappl16 200 61185 0 60242 156 106 50 50 0 8 0 amappl15 192 2280 0 2276 4 3 1 1 0 8 0 amappl14 184 1400 0 1397 1 0 1 1 0 8 0 amappl13 176 3057 0 3053 1 0 1 1 0 8 0 amappl12 168 3530 0 3524 1 0 1 1 0 8 0 amappl11 160 1486 0 1469 1 0 1 1 0 8 0 amappl10 152 771 0 767 2 1 1 1 0 8 0 amappl9 144 2311 0 2309 1 0 1 1 0 8 0 amappl8 136 2375 0 2255 5 0 5 5 0 8 0 amappl7 128 1032 0 1011 1 0 1 1 0 8 0 amappl6 120 2374 0 2353 2 1 1 2 0 8 0 amappl5 112 11375 0 11362 1 0 1 1 0 8 0 amappl4 104 4126 0 4094 3 2 1 2 0 8 0 amappl3 96 48118 0 48060 2 0 2 2 0 8 0 amappl2 88 5944 0 5882 3 1 2 2 0 8 0 amappl1 80 371780 0 371033 28 11 17 21 0 8 0 amappl 88 82825 0 82623 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 15083 0 15016 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 15083 0 15016 1 0 1 1 0 8 0 vmmpekpl 168 111901 0 111844 4 0 4 4 0 8 0 vmmpepl 168 1494985 0 1491888 416 246 170 177 0 357 25 vmsppl 272 15082 0 15015 7 1 6 6 0 8 0 rwobjpl 24 379923 0 371684 54 4 50 50 0 8 0 pdppl 4096 30172 0 30071 832 728 104 117 0 8 3 pvpl 32 6336000 0 6311153 535 282 253 259 0 265 42 pmappl 216 15082 0 15015 5 0 5 5 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 3008 0 2161 38 11 27 37 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(ffffffff82574758) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5f6,ffffffff8259f328,4f5,ffffffff8259f35b) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800649e780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680efaa0,b93cd391000,b93cd590000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd80680efaa0,fffffd80769ad348,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd80680efaa0) 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(ffffffff82574758) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5f6,ffffffff8259f328,4f5,ffffffff8259f35b) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800649e780) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80680efaa0,b93cd391000,b93cd590000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd80680efaa0,fffffd80769ad348,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80680efaa0) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd80680efaa0) 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