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 *315366 5778 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82578f84) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0daf,ffffffff825a4765,4f5,ffffffff825a4798) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800679d680) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd807a4ae440,5cb9f3de000,5cb9f3df000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd807a4ae440,fffffd80677f7820,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd807a4ae440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 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(ffffffff82578f84) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0daf,ffffffff825a4765,4f5,ffffffff825a4798) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800679d680) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd807a4ae440,5cb9f3de000,5cb9f3df000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd807a4ae440,fffffd80677f7820,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd807a4ae440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 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 0xffff8000216c0770 rbx 0xfffffd800679d680 rdx 0 rcx 0 rax 0xffff8000ffff9ce8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x6f20136c843a6d5 r11 0x7d68b2918af1d266 r12 0 r13 0xffff8000216c0898 r14 0 r15 0x1 rip 0xffffffff823ac408 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216c0760 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=315366 stat=onproc flags process=14000 proc=200 pri=85, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffffce0,0xffff8000ffff97b8 process=0xffff8000ffffa3f0 user=0xffff8000216bb000, vmspace=0xffffffff82acfdd0 estcpu=36, cpticks=8, pctcpu=12.79 user=0, sys=3, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 25014 278663 16519 0 2 0x480 syz-executor.7 25014 395077 16519 0 3 0x4000080 fsleep syz-executor.7 19900 107026 48995 0 2 0x482 syz-executor.3 16519 137217 48995 0 2 0x482 syz-executor.7 67759 183622 0 0 3 0x14280 nfsidl nfsio 15679 197392 0 0 3 0x14280 nfsidl nfsio 78267 442908 0 0 3 0x14280 nfsidl nfsio 31683 216759 0 0 3 0x14280 nfsidl nfsio 87654 318161 0 0 3 0x14280 nfsidl nfsio 51132 165530 0 0 3 0x14280 nfsidl nfsio 40356 223732 0 0 3 0x14280 nfsidl nfsio 95369 390058 0 0 3 0x14280 nfsidl nfsio 79669 162593 0 0 3 0x14280 nfsidl nfsio 39383 342358 0 0 3 0x14280 nfsidl nfsio 35445 92754 0 0 3 0x14280 nfsidl nfsio 53764 219828 0 0 3 0x14280 nfsidl nfsio 93093 241842 0 0 3 0x14280 nfsidl nfsio 26092 71224 0 0 3 0x14280 nfsidl nfsio 71648 25159 0 0 3 0x14280 nfsidl nfsio 9913 289081 0 0 3 0x14280 nfsidl nfsio 71573 295158 0 0 3 0x14280 nfsidl nfsio 67670 14222 0 0 3 0x14280 nfsidl nfsio 58494 256737 0 0 3 0x14280 nfsidl nfsio 20228 260531 0 0 3 0x14280 nfsidl nfsio 53723 506257 1 0 3 0x100083 ttyin getty 33915 205928 0 0 3 0x14200 bored sosplice 48995 151433 93896 0 3 0x82 wait syz-fuzzer 48995 195457 93896 0 2 0x4000482 syz-fuzzer 48995 395873 93896 0 3 0x4000082 thrsleep syz-fuzzer 48995 431048 93896 0 3 0x4000082 wait syz-fuzzer 48995 232868 93896 0 3 0x4000082 thrsleep syz-fuzzer 48995 102189 93896 0 3 0x4000082 thrsleep syz-fuzzer 48995 237812 93896 0 3 0x4000082 wait syz-fuzzer 48995 12183 93896 0 3 0x4000082 thrsleep syz-fuzzer 48995 271190 93896 0 3 0x4000082 wait syz-fuzzer 48995 30734 93896 0 3 0x4000082 wait syz-fuzzer 48995 196760 93896 0 3 0x4000082 thrsleep syz-fuzzer 48995 211056 93896 0 3 0x4000082 wait syz-fuzzer 48995 394850 93896 0 3 0x4000082 kqread syz-fuzzer 48995 34908 93896 0 3 0x4000082 wait syz-fuzzer 48995 184314 93896 0 3 0x4000082 wait syz-fuzzer 93896 511287 32962 0 3 0x10008a sigsusp ksh 32962 194694 57021 0 3 0x9a kqread sshd 57021 481237 1 0 3 0x88 kqread sshd 15989 332533 26851 73 2 0x1100010 syslogd 26851 345471 1 0 3 0x100082 netio syslogd 91350 399744 1 0 3 0x100080 kqread resolvd 97354 85664 0 0 3 0x14200 bored smr 55043 308284 0 0 2 0x14200 zerothread 2766 354591 0 0 3 0x14200 aiodoned aiodoned 69804 171251 0 0 3 0x14200 syncer update 78701 278972 0 0 3 0x14200 cleaner cleaner * 5778 315366 0 0 7 0x14200 reaper 69913 325780 0 0 3 0x14200 pgdaemon pagedaemon 64530 445879 0 0 3 0x14200 bored viomb 18637 97797 0 0 3 0x40014200 acpi0 acpi0 19889 433961 0 0 3 0x14200 bored softnet 30993 248478 0 0 3 0x14200 bored softnet 76443 456948 0 0 3 0x14200 bored softnet 70397 32853 0 0 3 0x14200 bored softnet 46549 390269 0 0 3 0x14200 bored systqmp 18977 151337 0 0 3 0x14200 bored systq 72320 246676 0 0 3 0x40014200 bored softclock 87526 197293 0 0 3 0x40014200 idle0 1 170100 0 0 3 0x80082 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 10211 6436K 7129K 78643K 19215 0 pcb 13 24K 29K 78643K 32842 0 rtable 183 21K 24K 78643K 9666 0 ifaddr 305 83K 90K 78643K 3423 0 sysctl 2 0K 2K 78643K 43 0 counters 26 17K 17K 78643K 734 0 ioctlops 0 0K 4K 78643K 6646 0 iov 0 0K 28K 78643K 4416 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1393 87K 87K 78643K 9960 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 214 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 2787 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 8 25K 69K 78643K 27840 0 sigio 0 0K 0K 78643K 2759 0 proc 58 43K 75K 78643K 6379 0 subproc 65 4K 7K 78643K 2262 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1650 0 in_multi 54 3K 6K 78643K 3295 0 ether_multi 1 0K 0K 78643K 197 0 mrt 1 0K 0K 78643K 105 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 241 1076K 1076K 78643K 241 0 exec 0 0K 2K 78643K 9503 0 pfkey data 0 0K 0K 78643K 184 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 493 874K 890K 78643K 152059 0 UVM aobj 131 4K 4K 78643K 149 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1113 0 NDP 13 0K 2K 78643K 1042 0 temp 133 4730K 6779K 78643K 339078 0 kqueue 6 10K 26K 78643K 2374 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 2484 0 2483 22 21 1 5 0 8 0 rtentry 112 3014 0 2955 5 2 3 4 0 8 0 unpcb 144 20083 0 20077 203 202 1 10 0 8 0 syncache 296 73 0 73 14 14 0 1 0 8 0 tcpqe 32 840 0 840 10 10 0 1 0 8 0 tcpcb 768 10223 0 10219 365 360 5 19 0 8 4 arp 88 394 0 383 1 0 1 1 0 8 0 ipq 40 96 0 96 14 14 0 1 0 8 0 ipqe 40 278 0 278 14 14 0 1 0 8 0 inpcb 336 82732 0 82728 916 910 6 31 0 8 5 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 3 0 3 1 1 0 1 0 8 0 nd6 48 652 0 640 1 0 1 1 0 8 0 pkpcb 40 188 0 188 22 22 0 1 0 8 0 kcovpl 48 174 0 169 1 0 1 1 0 8 0 mppekey 1024 6 0 6 2 2 0 1 0 8 0 ppxss 1160 383 0 382 46 45 1 1 0 8 0 pppxif 1608 147 0 146 22 21 1 1 0 8 0 pfstscr 40 169 0 157 1 0 1 1 0 8 0 pfosfp 40 10 0 8 1 0 1 1 0 8 0 pfosfpen 112 10 0 8 1 0 1 1 0 8 0 pfrktable 1344 259 0 247 4 2 2 2 0 8 0 pfanchor 1280 588 8 76 43 0 43 43 0 8 0 pftag 88 8 0 2 1 0 1 1 0 8 0 pfqueue 264 5 0 5 2 2 0 1 0 8 0 pfstitem 24 51 0 32 1 0 1 1 0 8 0 pfstkey 120 199 0 193 1 0 1 1 0 8 0 pfstate 336 101 0 90 2 1 1 2 0 8 0 pfrule 1360 272 0 238 5 2 3 4 0 8 0 rttmr 136 18 0 18 5 5 0 1 0 8 0 art_heap8 4096 33 0 31 26 24 2 3 0 8 0 art_heap4 256 13961 0 13702 123 104 19 30 0 8 0 art_table 32 13994 0 13733 6 3 3 4 0 8 0 art_node 16 3000 0 2949 1 0 1 1 0 8 0 sysvmsgpl 40 30 0 23 3 2 1 1 0 8 0 semapl 112 2785 0 2775 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 38650 0 37092 100 2 98 98 0 8 0 ffsino 240 38650 0 37092 94 2 92 92 0 8 0 nchpl 144 74588 0 74061 63 41 22 63 0 8 0 rtmask 32 15 0 15 6 6 0 1 0 8 0 uvmvnodes 80 41848 0 0 855 0 855 855 0 8 0 vnodes 216 41848 0 0 2325 0 2325 2325 0 8 0 namei 1024 284731 0 284731 23 22 1 2 0 8 1 vcpupl 2048 183 0 1 23 0 23 23 0 8 0 vmpool 536 296 0 114 14 1 13 13 0 8 0 pfiaddrpl 120 154 0 139 2 1 1 1 0 8 0 kstatmem 264 1028 0 1002 4 1 3 3 0 8 0 scsiplug 72 27 0 27 8 8 0 1 0 8 0 scxspl 216 226475 0 226475 54 53 1 8 0 8 1 plimitpl 152 4479 0 4464 1 0 1 1 0 8 0 sigapl 424 27871 0 27808 11 3 8 8 0 8 0 futexpl 64 306515 0 306514 12 11 1 1 0 8 0 knotepl 120 458238 0 458186 207 203 4 14 0 8 0 kqueuepl 184 5681 0 5676 55 54 1 5 0 8 0 pipepl 288 7066 0 7044 146 143 3 9 0 8 0 fdescpl 432 27771 0 27755 6 3 3 4 0 8 0 filepl 120 249828 0 249673 327 316 11 21 0 8 4 lockfpl 104 6569 0 6568 12 11 1 2 0 8 0 lockfspl 48 1649 0 1648 1 0 1 1 0 8 0 sessionpl 144 197 0 182 1 0 1 1 0 8 0 pgrppl 48 365 0 350 1 0 1 1 0 8 0 ucredpl 104 26991 0 26980 1 0 1 1 0 8 0 zombiepl 144 27821 0 27808 8 7 1 1 0 8 0 processpl 1000 27871 0 27808 14 6 8 9 0 8 0 procpl 672 71469 0 71386 66 58 8 11 0 8 0 sosppl 168 256 0 256 45 45 0 1 0 8 0 sockpl 456 105792 0 105781 2429 2417 12 51 0 8 10 mcl64k 65536 1065 0 1065 62 62 0 1 0 8 0 mcl16k 16384 300 0 300 61 61 0 1 0 8 0 mcl12k 12288 1017 0 1017 57 57 0 1 0 8 0 mcl9k 9216 327 0 327 58 58 0 1 0 8 0 mcl8k 8192 1541 0 1541 53 53 0 1 0 8 0 mcl4k 4096 3122 0 3122 36 36 0 1 0 8 0 mcl2k2 2112 380 0 380 66 66 0 1 0 8 0 mcl2k 2048 138066 0 138007 98 90 8 26 0 8 0 mtagpl 96 433 0 433 21 21 0 4 0 8 0 mbufpl 256 492052 0 491957 1555 1544 11 160 0 8 0 bufpl 288 51187 0 42621 612 0 612 612 0 8 0 anonpl 24 5166307 0 5145135 300 172 128 136 0 188 0 amapchunkpl 152 467272 0 466328 211 174 37 41 0 158 0 amappl16 200 68839 0 68094 207 167 40 49 0 8 0 amappl15 192 4885 0 4876 1 0 1 1 0 8 0 amappl14 184 2769 0 2762 1 0 1 1 0 8 0 amappl13 176 4582 0 4577 1 0 1 1 0 8 0 amappl12 168 4285 0 4276 1 0 1 1 0 8 0 amappl11 160 3383 0 3373 1 0 1 1 0 8 0 amappl10 152 2837 0 2820 1 0 1 1 0 8 0 amappl9 144 5260 0 5258 3 2 1 1 0 8 0 amappl8 136 6845 0 6698 6 0 6 6 0 8 0 amappl7 128 3739 0 3718 1 0 1 1 0 8 0 amappl6 120 5825 0 5796 2 1 1 2 0 8 0 amappl5 112 19614 0 19602 1 0 1 1 0 8 0 amappl4 104 11855 0 11811 2 0 2 2 0 8 0 amappl3 96 84912 0 84857 3 1 2 2 0 8 0 amappl2 88 7957 0 7917 3 1 2 3 0 8 0 amappl1 80 649443 0 648791 24 10 14 21 0 8 0 amappl 88 148427 0 148205 8 2 6 6 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 72 148 0 18 3 0 3 3 0 8 0 uaddrrnd 24 28067 0 27860 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 28067 0 27860 2 0 2 2 0 8 0 vmmpekpl 168 200065 0 199979 5 0 5 5 0 8 0 vmmpepl 168 2754525 0 2751298 586 431 155 169 0 357 4 vmsppl 272 28066 0 27859 16 2 14 14 0 8 0 rwobjpl 24 675589 0 631758 269 4 265 265 0 8 0 pdppl 4096 56140 0 55900 1916 1676 240 242 0 8 0 pvpl 32 10440972 0 10418425 631 396 235 252 0 265 28 pmappl 216 28066 0 27859 14 2 12 12 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 5875 0 4738 35 2 33 34 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(ffffffff82578f84) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0daf,ffffffff825a4765,4f5,ffffffff825a4798) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800679d680) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd807a4ae440,5cb9f3de000,5cb9f3df000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd807a4ae440,fffffd80677f7820,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd807a4ae440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 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(ffffffff82578f84) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f0daf,ffffffff825a4765,4f5,ffffffff825a4798) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800679d680) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd807a4ae440,5cb9f3de000,5cb9f3df000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd807a4ae440,fffffd80677f7820,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1912 uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd807a4ae440) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2562 uvmspace_free(fffffd807a4ae440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3480 reaper(ffff8000ffff9ce8) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9