panic: pool_do_get: pvpl free list modified: page 0xfffffd8058a89000; item addr 0xfffffd8058a89008; offset 0x0=0x0 != 0xaaa5e42ff7488c29 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *428022 34120 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8246ada6) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff828472d8,2,ffff80001e7a7c68) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff828472d8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc09960,20181000,5358b000,5,21) at pmap_enter+0x160 uvm_fault(fffffd806bc0a550,20181000,0,1) at uvm_fault+0x108c sys/uvm/uvm_fault.c:1217 pageflttrap(ffff80001e7a80e0,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e7a80e0) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e7a8430) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2d4545de380, count: 3 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 pool_do_get: pvpl free list modified: page 0xfffffd8058a89000; item addr 0xfffffd8058a89008; offset 0x0=0x0 != 0xaaa5e42ff7488c29 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8246ada6) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff828472d8,2,ffff80001e7a7c68) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff828472d8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc09960,20181000,5358b000,5,21) at pmap_enter+0x160 uvm_fault(fffffd806bc0a550,20181000,0,1) at uvm_fault+0x108c sys/uvm/uvm_fault.c:1217 pageflttrap(ffff80001e7a80e0,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e7a80e0) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e7a8430) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2d4545de380, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001e7a7ad0 rbx 0xffff80001e7a7b80 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff8147206f kprintf+0x15f r9 0x1 r10 0x2 r11 0xc217167118f6df87 r12 0x3000000008 r13 0xffff80001e7a7ae0 r14 0x100 r15 0x1 rip 0xffffffff81e985d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e7a7ac0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=428022 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80001d6a9ea8,0xffffffff82845f40 process=0xffff8000ffffaad8 user=0xffff80001e7a3000, vmspace=0xfffffd806bc0a550 estcpu=36, cpticks=6, pctcpu=0.0 user=0, sys=6, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 34120 229352 95461 0 2 0 syz-executor.1 *34120 428022 95461 0 7 0x4000000 syz-executor.1 59420 176085 68025 0 2 0 syz-executor.0 59420 508661 68025 0 3 0x4000080 nanosleep syz-executor.0 75215 173479 1 0 3 0x100083 ttyin getty 81873 432781 0 0 3 0x14200 bored sosplice 68025 138834 69785 0 2 0x482 syz-executor.0 95461 288260 69785 0 2 0x482 syz-executor.1 69785 243270 3529 0 3 0x82 thrsleep syz-fuzzer 69785 91573 3529 0 3 0x4000082 thrsleep syz-fuzzer 69785 50017 3529 0 2 0x4000482 syz-fuzzer 69785 492972 3529 0 3 0x4000082 thrsleep syz-fuzzer 69785 104268 3529 0 3 0x4000082 thrsleep syz-fuzzer 69785 403094 3529 0 3 0x4000082 kqread syz-fuzzer 69785 392338 3529 0 3 0x4000082 thrsleep syz-fuzzer 3529 186839 33116 0 3 0x10008a pause ksh 33116 293418 20582 0 3 0x92 select sshd 20582 125972 1 0 3 0x80 select sshd 40822 445483 47530 73 3 0x100090 kqread syslogd 47530 207637 1 0 3 0x100082 netio syslogd 7810 206728 1 77 3 0x100090 poll dhclient 96596 520963 1 0 3 0x80 poll dhclient 52039 202847 0 0 2 0x14200 smr 93217 95232 0 0 2 0x14200 zerothread 89711 492463 0 0 3 0x14200 aiodoned aiodoned 27815 63930 0 0 3 0x14200 syncer update 78539 27506 0 0 3 0x14200 cleaner cleaner 42585 235901 0 0 3 0x14200 reaper reaper 47783 299556 0 0 3 0x14200 pgdaemon pagedaemon 16841 58840 0 0 3 0x14200 bored crynlk 66620 204824 0 0 3 0x14200 bored crypto 75347 504526 0 0 3 0x40014200 acpi0 acpi0 71160 354234 0 0 3 0x14200 bored softnet 72416 254777 0 0 3 0x14200 bored systqmp 62650 476855 0 0 3 0x14200 bored systq 47560 499067 0 0 3 0x40014200 bored softclock 11271 74443 0 0 3 0x40014200 idle0 1 92893 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 9512 6473K 6714K 78643K 11065 0 pcb 13 8K 8K 78643K 71 0 rtable 104 13K 16K 78643K 464 0 ifaddr 85 17K 17K 78643K 150 0 counters 21 16K 16K 78643K 21 0 ioctlops 0 0K 4K 78643K 66 0 iov 0 0K 16K 78643K 30 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1363 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 71 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 6 17K 25K 78643K 308 0 sigio 0 0K 0K 78643K 18 0 proc 49 38K 54K 78643K 410 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 17 0 in_multi 61 2K 3K 78643K 133 0 ether_multi 1 0K 0K 78643K 10 0 mrt 0 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 202 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 134 39K 39K 78643K 1579 0 UVM aobj 23 4K 4K 78643K 26 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 44 0 NDP 12 0K 0K 78643K 20 0 temp 97 3857K 3921K 78643K 15220 0 kqueue 3 4K 8K 78643K 21 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 arp 64 11 0 1 1 0 1 1 0 8 0 rtpcb 80 39 0 37 1 0 1 1 0 8 0 rtentry 112 75 0 40 2 0 2 2 0 8 0 unpcb 120 195 0 185 1 0 1 1 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpqe 32 61 0 61 1 1 0 1 0 8 0 tcpcb 544 94 0 90 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 2 0 2 1 0 1 1 0 8 1 inpcb 296 324 0 314 3 1 2 2 0 8 1 rttmr 72 1 0 1 1 1 0 1 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 15 0 10 1 0 1 1 0 8 0 pfstscr 40 2 0 0 1 0 1 1 0 8 0 pfrktable 1344 78 0 73 3 1 2 2 0 8 1 pftag 88 20 0 18 1 0 1 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 112 1 0 0 1 0 1 1 0 8 0 pfstate 328 1 0 0 1 0 1 1 0 8 0 pfrule 1360 16 0 10 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 287 0 131 14 3 11 14 0 8 0 art_table 32 289 0 131 2 0 2 2 0 8 0 art_node 16 70 0 39 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 61 0 51 1 0 1 1 0 8 0 shmpl 112 24 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1814 0 415 88 0 88 88 0 8 0 ffsino 240 1814 0 415 83 0 83 83 0 8 0 nchpl 144 2407 0 802 60 0 60 60 0 8 0 uvmvnodes 72 1956 0 0 36 0 36 36 0 8 0 vnodes 208 1956 0 0 103 0 103 103 0 8 0 namei 1024 6416 0 6416 2 1 1 1 0 8 1 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 528 4 0 3 1 0 1 1 0 8 0 pfiaddrpl 120 28 0 24 1 0 1 1 0 8 0 scxspl 192 7186 0 7186 2 1 1 1 0 8 1 plimitpl 152 43 0 35 1 0 1 1 0 8 0 sigapl 424 498 0 468 4 0 4 4 0 8 0 futexpl 56 6268 0 6268 2 1 1 1 0 8 1 knotepl 112 89 0 70 1 0 1 1 0 8 0 kqueuepl 144 402 0 399 1 0 1 1 0 8 0 pipelkpl 16 109 0 99 1 0 1 1 0 8 0 pipepl 120 218 0 199 1 0 1 1 0 8 0 fdescpl 432 481 0 466 2 0 2 2 0 8 0 filepl 120 2956 0 2856 4 0 4 4 0 8 0 lockfpl 104 83 0 82 1 0 1 1 0 8 0 lockfspl 48 32 0 31 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 22 0 12 1 0 1 1 0 8 0 ucredpl 96 249 0 242 1 0 1 1 0 8 0 zombiepl 144 468 0 468 2 1 1 1 0 8 1 processpl 920 498 0 468 4 0 4 4 0 8 0 procpl 624 847 0 809 5 1 4 4 0 8 1 sosppl 128 8 0 8 3 2 1 1 0 8 1 sockpl 400 560 0 540 5 2 3 4 0 8 0 mcl64k 65536 523 0 523 67 2 65 65 0 8 65 mcl12k 12288 5 0 5 3 2 1 1 0 8 1 mcl9k 9216 4 0 4 3 2 1 1 0 8 1 mcl8k 8192 14 0 14 3 2 1 1 0 8 1 mcl4k 4096 29 0 29 3 2 1 1 0 8 1 mcl2k2 2112 2 0 2 2 1 1 1 0 8 1 mcl2k 2048 75723 0 75675 14 7 7 13 0 8 0 mtagpl 96 43 0 3 2 1 1 1 0 8 0 mbufpl 256 122378 0 122180 51 6 45 45 0 8 27 bufpl 280 3802 0 126 263 0 263 263 0 8 0 anonpl 16 67850 0 51119 98 16 82 82 0 107 13 amapchunkpl 152 2848 0 2701 21 14 7 20 0 158 1 amappl16 192 2704 0 1794 68 11 57 57 0 8 11 amappl15 184 277 0 271 1 0 1 1 0 8 0 amappl14 176 24 0 19 1 0 1 1 0 8 0 amappl13 168 28 0 25 1 0 1 1 0 8 0 amappl12 160 14 0 12 1 0 1 1 0 8 0 amappl11 152 183 0 172 1 0 1 1 0 8 0 amappl10 144 12 0 7 1 0 1 1 0 8 0 amappl9 136 335 0 334 1 0 1 1 0 8 0 amappl8 128 341 0 295 2 0 2 2 0 8 0 amappl7 120 107 0 95 1 0 1 1 0 8 0 amappl6 112 24 0 20 1 0 1 1 0 8 0 amappl5 104 494 0 479 1 0 1 1 0 8 0 amappl4 96 425 0 398 1 0 1 1 0 8 0 amappl3 88 116 0 109 1 0 1 1 0 8 0 amappl2 80 3278 0 3200 2 0 2 2 0 8 0 amappl1 72 18019 0 17584 24 15 9 17 0 8 0 amappl 80 1083 0 1036 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 25 0 3 1 0 1 1 0 8 0 uaddrrnd 24 485 0 469 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 485 0 469 1 0 1 1 0 8 0 vmmpekpl 168 6959 0 6934 2 0 2 2 0 8 0 vmmpepl 168 64324 0 62197 137 29 108 113 0 357 15 vmsppl 272 484 0 469 4 2 2 2 0 8 1 pdppl 4096 976 0 939 6 1 5 6 0 8 0 pvpl 32 199205 0 179433 229 36 193 193 0 265 33 pvpl: pool(0xffffffff828472d8:pvpl): free list modified: page 0xfffffd8058a89000; item ordinal 0; addr 0xfffffd8058a89008 (p 0xfffffd8058a89000); offset 0x0=0x0 pvpl: pool(0xffffffff828472d8:pvpl): page inconsistency: page 0xfffffd8058a89000; item ordinal 1; addr 0x15dbc0c80f921653 pmappl 200 484 0 469 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 354 0 31 10 0 10 10 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:398 panic(ffffffff8246ada6) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff828472d8,2,ffff80001e7a7c68) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff828472d8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc09960,20181000,5358b000,5,21) at pmap_enter+0x160 uvm_fault(fffffd806bc0a550,20181000,0,1) at uvm_fault+0x108c sys/uvm/uvm_fault.c:1217 pageflttrap(ffff80001e7a80e0,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e7a80e0) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e7a8430) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2d4545de380, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8246ada6) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff828472d8,2,ffff80001e7a7c68) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff828472d8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc09960,20181000,5358b000,5,21) at pmap_enter+0x160 uvm_fault(fffffd806bc0a550,20181000,0,1) at uvm_fault+0x108c sys/uvm/uvm_fault.c:1217 pageflttrap(ffff80001e7a80e0,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e7a80e0) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e7a8430) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2d4545de380, count: -12