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 *234558 96697 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82578b31) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5d0,ffffffff8259d02c,4f5,ffffffff8259d05f) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800635de80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd805cd70660,e156634c000,e156634d000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd805cd70660,fffffd806d5af210,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd805cd70660) 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(ffffffff82578b31) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5d0,ffffffff8259d02c,4f5,ffffffff8259d05f) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800635de80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd805cd70660,e156634c000,e156634d000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd805cd70660,fffffd806d5af210,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd805cd70660) 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 0xffff8000216bfdc0 rbx 0xfffffd800635de80 rdx 0 rcx 0 rax 0xffff8000ffff9ce8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2f46459a689a2337 r11 0x74c512bf0549eb0d r12 0 r13 0xffff8000216bfee8 r14 0 r15 0x1 rip 0xffffffff81932278 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216bfdb0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=234558 stat=onproc flags process=14000 proc=200 pri=84, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffefc0,0xffff8000ffff9518 process=0xffff8000ffffa008 user=0xffff8000216bb000, vmspace=0xffffffff82ab8fb0 estcpu=34, cpticks=5, pctcpu=17.32 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 77427 286007 0 0 3 0x14200 bored sosplice 21091 485419 11583 0 3 0x82 wait syz-executor.7 28976 366823 11583 0 3 0x82 wait syz-executor.5 38210 8922 11583 0 3 0x82 nanoslp syz-executor.4 15816 454947 11583 0 3 0x82 nanoslp syz-executor.3 37747 251861 11583 0 3 0x82 wait syz-executor.6 5294 82861 11583 0 3 0x82 nanoslp syz-executor.0 59912 12003 11583 0 3 0x82 nanoslp syz-executor.1 11583 463846 18943 0 3 0x82 wait syz-fuzzer 11583 383927 18943 0 3 0x4000082 nanoslp syz-fuzzer 11583 167878 18943 0 3 0x4000082 wait syz-fuzzer 11583 517317 18943 0 3 0x4000082 wait syz-fuzzer 11583 333612 18943 0 3 0x4000082 thrsleep syz-fuzzer 11583 111955 18943 0 3 0x4000082 thrsleep syz-fuzzer 11583 490615 18943 0 3 0x4000082 wait syz-fuzzer 11583 177759 18943 0 3 0x4000082 thrsleep syz-fuzzer 11583 358380 18943 0 3 0x4000082 thrsleep syz-fuzzer 11583 239335 18943 0 3 0x4000082 wait syz-fuzzer 11583 347374 18943 0 3 0x4000082 wait syz-fuzzer 11583 47189 18943 0 3 0x4000082 wait syz-fuzzer 11583 232310 18943 0 2 0x4000002 syz-fuzzer 11583 151850 18943 0 3 0x4000082 thrsleep syz-fuzzer 18943 324464 11367 0 3 0x10008a sigsusp ksh 11367 129171 10936 0 3 0x9a kqread sshd 79973 38009 1 0 3 0x100083 ttyin getty 10936 364822 1 0 3 0x88 kqread sshd 70842 212356 3274 73 2 0x1100010 syslogd 3274 216042 1 0 3 0x100082 netio syslogd 49672 383393 1 0 3 0x100080 kqread resolvd 62559 243026 24363 77 3 0x100092 kqread dhcpleased 95112 203937 24363 77 3 0x100092 kqread dhcpleased 24363 11930 1 0 3 0x80 kqread dhcpleased 92859 94193 0 0 3 0x14200 bored smr 97746 129847 0 0 2 0x14200 zerothread 47872 444411 0 0 3 0x14200 aiodoned aiodoned 40119 439605 0 0 3 0x14200 syncer update 64373 493695 0 0 3 0x14200 cleaner cleaner *96697 234558 0 0 7 0x14200 reaper 25533 426493 0 0 3 0x14200 pgdaemon pagedaemon 70791 142343 0 0 3 0x14200 bored viomb 21040 111974 0 0 3 0x40014200 acpi0 acpi0 33822 152974 0 0 3 0x14200 bored softnet 87648 485448 0 0 3 0x14200 bored softnet 3439 37071 0 0 3 0x14200 bored softnet 83089 457945 0 0 2 0x14200 softnet 73265 25085 0 0 3 0x14200 bored systqmp 7684 227679 0 0 3 0x14200 bored systq 49952 400936 0 0 3 0x40014200 bored softclock 35394 180602 0 0 3 0x40014200 idle0 1 488651 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 10170 6399K 6738K 78643K 11892 0 pcb 13 10K 11K 78643K 78 0 rtable 180 10K 11K 78643K 475 0 ifaddr 80 17K 17K 78643K 133 0 counters 25 17K 17K 78643K 39 0 ioctlops 0 0K 4K 78643K 328 0 iov 0 0K 12K 78643K 29 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1366 85K 86K 78643K 1577 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 35 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 9 29K 69K 78643K 664 0 sigio 0 0K 0K 78643K 76 0 proc 57 59K 75K 78643K 555 0 subproc 91 5K 6K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 5 0 in_multi 77 5K 6K 78643K 137 0 ether_multi 1 0K 0K 78643K 4 0 mrt 0 0K 0K 78643K 9 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 836 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 265 133K 133K 78643K 4825 0 UVM aobj 10 2K 2K 78643K 10 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 33 0 NDP 10 0K 1K 78643K 41 0 temp 102 4721K 4784K 78643K 16060 0 kqueue 12 18K 24K 78643K 70 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 67 0 64 1 0 1 1 0 8 0 rtentry 112 142 0 64 4 0 4 4 0 8 0 unpcb 144 298 0 285 5 4 1 5 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 202 0 202 1 1 0 1 0 8 0 tcpcb 768 56 0 52 3 2 1 2 0 8 0 arp 88 22 0 8 1 0 1 1 0 8 0 inpcb 336 579 0 572 18 12 6 7 0 8 5 nd6 48 31 0 13 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 10 0 3 1 0 1 1 0 8 0 ppxss 1160 10 0 10 2 2 0 1 0 8 0 pfrktable 1344 3 0 1 1 0 1 1 0 8 0 pfanchor 1280 30 0 28 2 1 1 1 0 8 0 pfrule 1360 15 0 11 2 1 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 256 632 0 278 29 5 24 29 0 8 0 art_table 32 633 0 278 4 0 4 4 0 8 0 art_node 16 141 0 71 1 0 1 1 0 8 0 sysvmsgpl 40 39 0 35 1 0 1 1 0 8 0 semapl 112 33 0 23 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2121 0 685 91 0 91 91 0 8 0 ffsino 240 2121 0 685 85 0 85 85 0 8 0 nchpl 144 3209 0 1574 63 0 63 63 0 8 0 uvmvnodes 80 2495 0 0 51 0 51 51 0 8 0 vnodes 216 2495 0 0 139 0 139 139 0 8 0 namei 1024 12087 0 12086 2 1 1 2 0 8 0 vcpupl 2048 68 0 0 9 0 9 9 0 8 0 vmpool 536 68 0 0 5 0 5 5 0 8 0 pfiaddrpl 120 4 0 0 1 0 1 1 0 8 0 kstatmem 264 40 0 20 2 0 2 2 0 8 0 scxspl 216 9893 0 9893 10 9 1 8 0 8 1 plimitpl 152 67 0 51 1 0 1 1 0 8 0 sigapl 424 951 0 906 6 0 6 6 0 8 0 futexpl 64 5101 0 5101 3 2 1 1 0 8 1 knotepl 120 20989 0 20915 11 8 3 11 0 8 0 kqueuepl 184 171 0 163 4 3 1 4 0 8 0 pipepl 288 369 0 344 8 6 2 7 0 8 0 fdescpl 432 934 0 914 4 0 4 4 0 8 0 filepl 120 5311 0 5098 19 10 9 17 0 8 1 lockfpl 104 44 0 42 1 0 1 1 0 8 0 lockfspl 48 22 0 20 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 29 0 13 1 0 1 1 0 8 0 ucredpl 104 348 0 338 1 0 1 1 0 8 0 zombiepl 144 914 0 906 1 0 1 1 0 8 0 processpl 1000 951 0 906 6 0 6 6 0 8 0 procpl 672 1807 0 1730 9 2 7 7 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 456 945 0 922 34 23 11 17 0 8 8 mcl64k 65536 16 0 16 1 1 0 1 0 8 0 mcl16k 16384 11 0 11 1 1 0 1 0 8 0 mcl12k 12288 17 0 17 2 1 1 1 0 8 1 mcl9k 9216 6 0 6 2 2 0 1 0 8 0 mcl8k 8192 29 0 29 3 2 1 1 0 8 1 mcl4k 4096 124 0 124 4 3 1 1 0 8 1 mcl2k2 2112 3 0 3 3 3 0 1 0 8 0 mcl2k 2048 68997 0 68928 18 8 10 15 0 8 0 mtagpl 96 57 0 41 3 1 2 2 0 8 0 mbufpl 256 113391 0 113175 19 0 19 19 0 8 0 bufpl 288 4959 0 124 346 0 346 346 0 8 0 anonpl 24 190782 0 172427 142 19 123 127 0 188 0 amapchunkpl 152 13345 0 12414 38 2 36 36 0 158 0 amappl16 200 3367 0 2798 49 17 32 43 0 8 0 amappl15 192 4 0 1 1 0 1 1 0 8 0 amappl14 184 42 0 40 1 0 1 1 0 8 0 amappl13 176 157 0 154 1 0 1 1 0 8 0 amappl12 168 157 0 151 1 0 1 1 0 8 0 amappl11 160 322 0 299 2 1 1 2 0 8 0 amappl10 152 21 0 17 1 0 1 1 0 8 0 amappl9 144 570 0 567 1 0 1 1 0 8 0 amappl8 136 573 0 522 2 0 2 2 0 8 0 amappl7 128 122 0 108 1 0 1 1 0 8 0 amappl6 120 257 0 237 2 1 1 2 0 8 0 amappl5 112 335 0 324 1 0 1 1 0 8 0 amappl4 104 1186 0 1151 2 1 1 2 0 8 0 amappl3 96 2251 0 2183 2 0 2 2 0 8 0 amappl2 88 665 0 610 3 1 2 2 0 8 0 amappl1 80 24306 0 23512 22 5 17 21 0 8 0 amappl 88 4339 0 4164 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 9 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1002 0 907 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1002 0 907 1 0 1 1 0 8 0 vmmpekpl 168 12820 0 12771 3 0 3 3 0 8 0 vmmpepl 168 95937 0 92899 153 20 133 135 0 357 0 vmsppl 272 1001 0 906 7 0 7 7 0 8 0 rwobjpl 24 26859 0 22643 26 0 26 26 0 8 0 pdppl 4096 2010 0 1880 193 63 130 132 0 8 0 pvpl 32 556399 0 537197 275 45 230 258 0 265 46 pmappl 216 1001 0 906 7 1 6 6 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 843 0 105 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(ffffffff82578b31) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5d0,ffffffff8259d02c,4f5,ffffffff8259d05f) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800635de80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd805cd70660,e156634c000,e156634d000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd805cd70660,fffffd806d5af210,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd805cd70660) 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(ffffffff82578b31) at panic+0x161 sys/kern/subr_prf.c:198 __assert(ffffffff825ea5d0,ffffffff8259d02c,4f5,ffffffff8259d05f) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_pageunwire(fffffd800635de80) at uvm_pageunwire+0x16b sys/uvm/uvm_page.c:1269 uvm_fault_unwire_locked(fffffd805cd70660,e156634c000,e156634d000) at uvm_fault_unwire_locked+0x226 sys/uvm/uvm_fault.c:1682 uvm_unmap_kill_entry_withlock(fffffd805cd70660,fffffd806d5af210,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:1887 uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd805cd70660) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2523 uvmspace_free(fffffd805cd70660) 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