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 *459394 95132 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82579ccb) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f1633,ffffffff8259fc87,4f5,ffffffff8259fcba) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005f44200) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80744059a0,af10c879000,af10ca78000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80744059a0,fffffd8066575408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80744059a0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 reaper(ffff8000ffff9268) 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(ffffffff82579ccb) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f1633,ffffffff8259fc87,4f5,ffffffff8259fcba) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005f44200) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80744059a0,af10c879000,af10ca78000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80744059a0,fffffd8066575408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80744059a0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 reaper(ffff8000ffff9268) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000216bfc70 rbx 0xfffffd8005f44200 rdx 0 rcx 0 rax 0xffff8000ffff9268 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9b013d352d051bd9 r11 0x589c57a832a428cd r12 0 r13 0xffff8000216bfd98 r14 0 r15 0x1 rip 0xffffffff813f49d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216bfc60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=459394 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffffa40,0xffff8000ffff8fd8 process=0xffff8000ffffa008 user=0xffff8000216bb000, vmspace=0xffffffff829e43c8 estcpu=36, cpticks=27, pctcpu=20.12 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 68110 223901 45014 0 3 0 inode syz-fuzzer 13054 431165 45014 0 3 0x82 wait syz-executor.1 49854 365795 0 0 3 0x14200 bored sosplice 88976 466202 45014 0 3 0x82 wait syz-executor.0 19104 497807 0 0 3 0x14280 nfsidl nfsio 84907 519623 0 0 3 0x14280 nfsidl nfsio 92175 70636 0 0 3 0x14280 nfsidl nfsio 99059 386957 0 0 3 0x14280 nfsidl nfsio 58107 354754 0 0 3 0x14280 nfsidl nfsio 38962 142930 0 0 3 0x14280 nfsidl nfsio 46851 490077 0 0 3 0x14280 nfsidl nfsio 88622 97323 0 0 3 0x14280 nfsidl nfsio 72419 304609 0 0 3 0x14280 nfsidl nfsio 19816 108970 0 0 3 0x14280 nfsidl nfsio 50610 482785 0 0 3 0x14280 nfsidl nfsio 98097 417667 0 0 3 0x14280 nfsidl nfsio 18608 213332 0 0 3 0x14280 nfsidl nfsio 14646 209676 0 0 3 0x14280 nfsidl nfsio 74099 258273 0 0 3 0x14280 nfsidl nfsio 78409 389142 0 0 3 0x14280 nfsidl nfsio 45216 460379 0 0 3 0x14280 nfsidl nfsio 84707 267712 0 0 3 0x14280 nfsidl nfsio 71188 296273 0 0 3 0x14280 nfsidl nfsio 1396 373103 0 0 3 0x14280 nfsidl nfsio 45014 463955 3749 0 3 0x82 wait syz-fuzzer 45014 428248 3749 0 3 0x4000082 nanoslp syz-fuzzer 45014 455675 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 139401 3749 0 2 0x4000002 syz-fuzzer 45014 291398 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 272520 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 511324 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 470846 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 158689 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 18809 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 159834 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 71141 3749 0 3 0x4000082 wait syz-fuzzer 45014 198351 3749 0 3 0x4000082 thrsleep syz-fuzzer 45014 243904 3749 0 3 0x4000082 piperd syz-fuzzer 3749 347250 35202 0 3 0x10008a sigsusp ksh 35202 518449 14861 0 3 0x9a kqread sshd 5688 63415 1 0 3 0x100083 ttyin getty 14861 416141 1 0 3 0x88 kqread sshd 40956 340997 28659 73 3 0x1100010 biowait syslogd 28659 79831 1 0 3 0x100082 netio syslogd 85724 267620 1 0 3 0x100080 kqread resolvd 59918 425864 44852 77 3 0x100092 kqread dhcpleased 75343 165623 44852 77 3 0x100092 kqread dhcpleased 44852 499508 1 0 3 0x80 kqread dhcpleased 71561 189215 0 0 3 0x14200 bored smr 88062 222884 0 0 2 0x14200 zerothread 23811 148641 0 0 3 0x14200 aiodoned aiodoned 66960 506651 0 0 3 0x14200 syncer update 17252 466525 0 0 3 0x14200 cleaner cleaner *95132 459394 0 0 7 0x14200 reaper 14846 357826 0 0 3 0x14200 pgdaemon pagedaemon 3898 220114 0 0 3 0x14200 bored viomb 70027 430098 0 0 3 0x40014200 acpi0 acpi0 17627 349726 0 0 3 0x14200 bored softnet 68262 498522 0 0 3 0x14200 bored softnet 67143 413548 0 0 3 0x14200 bored softnet 91284 213491 0 0 3 0x14200 bored softnet 79695 169866 0 0 3 0x14200 bored systqmp 105 279274 0 0 3 0x14200 bored systq 82608 466686 0 0 3 0x40014200 bored softclock 55434 518809 0 0 3 0x40014200 idle0 1 295299 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 10155 6385K 6661K 78643K 11538 0 pcb 13 8K 8K 78643K 53 0 rtable 80 2K 6K 78643K 867 0 ifaddr 29 8K 16K 78643K 178 0 counters 21 16K 17K 78643K 45 0 ioctlops 0 0K 2K 78643K 52 0 iov 0 0K 16K 78643K 43 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1305 82K 82K 78643K 1627 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 12 0K 0K 78643K 95 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 5 10K 77K 78643K 572 0 sigio 0 0K 0K 78643K 1 0 proc 56 58K 83K 78643K 955 0 subproc 26 1K 6K 78643K 351 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 71 0 in_multi 22 1K 6K 78643K 286 0 ether_multi 1 0K 0K 78643K 1 0 mrt 0 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 593 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 229 44K 86K 78643K 4329 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 5 0 NDP 4 0K 1K 78643K 78 0 temp 37 4674K 4740K 78643K 6770 0 kqueue 12 18K 20K 78643K 37 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 71 0 68 1 0 1 1 0 8 0 rtentry 112 301 0 268 5 4 1 4 0 8 0 unpcb 144 208 0 195 6 5 1 6 0 8 0 syncache 296 7 0 7 2 2 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 532 0 532 3 3 0 2 0 8 0 tcpcb 776 107 0 103 7 6 1 7 0 8 0 arp 88 52 0 48 1 0 1 1 0 8 0 inpcb 336 281 0 274 9 8 1 7 0 8 0 nd6 48 75 0 72 1 0 1 1 0 8 0 kcovpl 48 27 0 25 1 0 1 1 0 8 0 rttmr 136 3 0 3 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1213 0 1066 48 33 15 29 0 8 5 art_table 32 1214 0 1066 5 3 2 4 0 8 0 art_node 16 300 0 270 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 93 0 83 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1766 0 351 90 0 90 90 0 8 0 ffsino 240 1766 0 351 85 0 85 85 0 8 0 nchpl 144 2437 0 825 63 0 63 63 0 8 0 uvmvnodes 80 2207 0 0 46 0 46 46 0 8 0 vnodes 216 2207 0 0 123 0 123 123 0 8 0 namei 1024 10508 0 10506 6 5 1 2 0 8 0 kstatmem 264 56 0 48 2 1 1 2 0 8 0 scxspl 216 17071 0 17063 13 12 1 8 0 8 0 plimitpl 152 63 0 53 1 0 1 1 0 8 0 sigapl 424 883 0 827 12 4 8 8 0 8 0 futexpl 64 2328 0 2328 9 9 0 1 0 8 0 knotepl 120 7974 0 7918 4 1 3 4 0 8 0 kqueuepl 184 35 0 27 1 0 1 1 0 8 0 pipepl 288 235 0 221 3 0 3 3 0 8 0 fdescpl 432 806 0 790 7 4 3 4 0 8 0 filepl 120 3574 0 3453 13 8 5 12 0 8 0 lockfpl 104 24 0 22 1 0 1 1 0 8 0 lockfspl 48 13 0 11 1 0 1 1 0 8 0 sessionpl 144 40 0 29 1 0 1 1 0 8 0 pgrppl 48 40 0 29 1 0 1 1 0 8 0 ucredpl 104 113 0 103 1 0 1 1 0 8 0 zombiepl 144 830 0 827 1 0 1 1 0 8 0 processpl 1008 883 0 827 14 6 8 9 0 8 0 procpl 672 1189 0 1116 9 1 8 8 0 8 0 sosppl 168 2 0 2 2 2 0 1 0 8 0 sockpl 456 560 0 537 24 21 3 20 0 8 0 mcl64k 65536 20 0 20 4 4 0 1 0 8 0 mcl16k 16384 15 0 15 2 2 0 1 0 8 0 mcl12k 12288 23 0 23 7 7 0 1 0 8 0 mcl9k 9216 1 0 1 1 1 0 1 0 8 0 mcl8k 8192 18 0 18 3 3 0 1 0 8 0 mcl4k 4096 37 0 37 7 7 0 1 0 8 0 mcl2k2 2112 2 0 2 2 2 0 1 0 8 0 mcl2k 2048 70600 0 70525 66 55 11 32 0 8 0 mtagpl 96 15 0 8 3 2 1 1 0 8 0 mbufpl 256 116742 0 116560 111 96 15 66 0 8 0 bufpl 288 6063 0 143 423 0 423 423 0 8 0 anonpl 24 249455 0 232398 243 34 209 243 0 188 105 amapchunkpl 152 17009 0 16105 83 34 49 83 0 158 14 amappl16 200 2931 0 2413 29 1 28 28 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 221 0 207 2 1 1 2 0 8 0 amappl13 176 4 0 3 1 0 1 1 0 8 0 amappl12 168 615 0 607 1 0 1 1 0 8 0 amappl11 160 44 0 34 1 0 1 1 0 8 0 amappl10 152 50 0 46 1 0 1 1 0 8 0 amappl9 144 933 0 933 1 1 0 1 0 8 0 amappl8 136 188 0 131 2 0 2 2 0 8 0 amappl7 128 45 0 30 1 0 1 1 0 8 0 amappl6 120 446 0 429 2 1 1 2 0 8 0 amappl5 112 82 0 74 1 0 1 1 0 8 0 amappl4 104 657 0 632 1 0 1 1 0 8 0 amappl3 96 1382 0 1339 2 0 2 2 0 8 0 amappl2 88 1215 0 1153 3 1 2 3 0 8 0 amappl1 80 19440 0 18846 23 8 15 21 0 8 0 amappl 88 3949 0 3798 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 806 0 788 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 806 0 788 1 0 1 1 0 8 0 vmmpekpl 168 11973 0 11934 3 0 3 3 0 8 0 vmmpepl 168 92193 0 89357 169 31 138 144 0 357 14 vmsppl 272 805 0 787 5 3 2 3 0 8 0 rwobjpl 24 25229 0 21585 23 0 23 23 0 8 0 pdppl 4096 1618 0 1574 135 90 45 70 0 8 1 pvpl 32 566680 0 544617 442 42 400 437 0 265 195 pmappl 216 805 0 787 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1004 0 308 22 0 22 22 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(ffffffff82579ccb) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f1633,ffffffff8259fc87,4f5,ffffffff8259fcba) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005f44200) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80744059a0,af10c879000,af10ca78000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80744059a0,fffffd8066575408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80744059a0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 reaper(ffff8000ffff9268) 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(ffffffff82579ccb) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825f1633,ffffffff8259fc87,4f5,ffffffff8259fcba) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd8005f44200) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd80744059a0,af10c879000,af10ca78000) at uvm_fault_unwire_locked+0x236 sys/uvm/uvm_fault.c:1683 uvm_unmap_kill_entry_withlock(fffffd80744059a0,fffffd8066575408,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1924 uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd80744059a0) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2578 uvmspace_free(fffffd80744059a0) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3513 reaper(ffff8000ffff9268) at reaper+0x15d sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -9