panic: pool_do_get: anonpl free list modified: page 0xfffffd8066782000; item addr 0xfffffd8066782000; offset 0x0=0x0 != 0x1fd118f7e4c73bb Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *416274 97620 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82223650) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82564eb8,2,ffff80001e459578) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff82564eb8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 uvm_analloc() at uvm_analloc+0x29 sys/uvm/uvm_anon.c:64 uvm_fault(fffffd805c1cbde0,2020a000,0,1) at uvm_fault+0xfa9 sys/uvm/uvm_fault.c:1114 pageflttrap(ffff80001e459900,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e459900) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e459c50) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeb83d484890, 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: anonpl free list modified: page 0xfffffd8066782000; item addr 0xfffffd8066782000; offset 0x0=0x0 != 0x1fd118f7e4c73bb ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82223650) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82564eb8,2,ffff80001e459578) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff82564eb8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 uvm_analloc() at uvm_analloc+0x29 sys/uvm/uvm_anon.c:64 uvm_fault(fffffd805c1cbde0,2020a000,0,1) at uvm_fault+0xfa9 sys/uvm/uvm_fault.c:1114 pageflttrap(ffff80001e459900,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e459900) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e459c50) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeb83d484890, count: -12 ddb> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff80001e4593e0 rbx 0xffff80001e459490 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80001f61f000 rax 0xffff800000a1c580 r8 0xffff80001e4593a0 r9 0x1 r10 0xffff800000a1c580 r11 0xcb00cd55e4cf54ab r12 0x3000000008 r13 0xffff80001e4593f0 r14 0x100 r15 0x1 rip 0xffffffff81e49f98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e4593d0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=416274 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff80001d349008,0xffffffff8254f840 process=0xffff8000ffffa010 user=0xffff80001e454000, vmspace=0xfffffd805c1cbde0 estcpu=28, cpticks=8, pctcpu=0.0 user=0, sys=8, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 97620 306007 48651 0 2 0 syz-executor.0 *97620 416274 48651 0 7 0x4000000 syz-executor.0 48651 366008 22677 0 2 0x482 syz-executor.0 74543 295484 0 0 3 0x14200 bored sosplice 25009 64774 22677 0 2 0x2 syz-executor.1 22677 520376 90037 0 3 0x82 thrsleep syz-fuzzer 22677 79084 90037 0 2 0x4000482 syz-fuzzer 22677 306130 90037 0 3 0x4000082 thrsleep syz-fuzzer 22677 461343 90037 0 3 0x4000082 thrsleep syz-fuzzer 22677 248510 90037 0 3 0x4000082 thrsleep syz-fuzzer 22677 48031 90037 0 3 0x4000082 kqread syz-fuzzer 22677 218104 90037 0 3 0x4000082 thrsleep syz-fuzzer 90037 513566 57518 0 3 0x10008a pause ksh 57518 372175 91349 0 3 0x92 select sshd 88852 229723 1 0 3 0x100083 ttyin getty 91349 182856 1 0 3 0x80 select sshd 23856 95890 38416 73 3 0x100090 kqread syslogd 38416 188450 1 0 3 0x100082 netio syslogd 13544 183278 1 77 3 0x100090 poll dhclient 10789 324413 1 0 3 0x80 poll dhclient 8123 178400 0 0 2 0x14200 zerothread 55091 162223 0 0 3 0x14200 aiodoned aiodoned 96918 305919 0 0 3 0x14200 syncer update 69889 109707 0 0 3 0x14200 cleaner cleaner 27937 268752 0 0 3 0x14200 reaper reaper 19309 195775 0 0 3 0x14200 pgdaemon pagedaemon 42738 335299 0 0 3 0x14200 bored crynlk 14421 100599 0 0 3 0x14200 bored crypto 19823 116248 0 0 3 0x40014200 acpi0 acpi0 46016 403224 0 0 3 0x14200 bored softnet 8360 45209 0 0 3 0x14200 bored systqmp 70750 281874 0 0 3 0x14200 bored systq 50817 259623 0 0 2 0x40014200 softclock 22024 53708 0 0 3 0x40014200 idle0 91409 390050 0 0 3 0x14200 bored smr 1 418639 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 9477 6334K 7945K 78643K 11248 0 pcb 13 8K 8K 78643K 185 0 rtable 117 4K 4K 78643K 331 0 ifaddr 64 14K 14K 78643K 109 0 counters 21 16K 16K 78643K 27 0 ioctlops 0 0K 2K 78643K 22 0 iov 0 0K 16K 78643K 127 0 mount 1 1K 1K 78643K 1 0 vnodes 1229 77K 78K 78643K 1446 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 58 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 261 0 sigio 0 0K 0K 78643K 4 0 proc 49 38K 55K 78643K 443 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 31 0 in_multi 67 3K 3K 78643K 117 0 ether_multi 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 234 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 116 70K 74K 78643K 1482 0 UVM aobj 20 4K 4K 78643K 20 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 41 0 NDP 8 0K 0K 78643K 23 0 temp 114 3017K 3093K 78643K 9074 0 kqueue 3 4K 10K 78643K 20 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 9 0 2 1 0 1 1 0 8 0 rtpcb 80 41 0 39 1 0 1 1 0 8 0 rtentry 112 76 0 29 2 0 2 2 0 8 0 unpcb 120 186 0 178 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 62 0 62 1 1 0 1 0 8 0 tcpcb 544 152 0 148 3 0 3 3 0 8 2 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 45 0 45 1 1 0 1 0 8 0 inpcb 280 604 0 597 5 0 5 5 0 8 4 nd6 48 10 0 6 1 0 1 1 0 8 0 ppxss 1128 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 348 0 133 15 0 15 15 0 8 0 art_table 32 350 0 133 2 0 2 2 0 8 0 art_node 16 73 0 29 1 0 1 1 0 8 0 sysvmsgpl 40 90 0 54 1 0 1 1 0 8 0 semapl 112 56 0 46 1 0 1 1 0 8 0 shmpl 112 18 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1766 0 370 46 0 46 46 0 8 0 ffsino 240 1766 0 370 83 0 83 83 0 8 0 nchpl 144 2362 0 764 60 0 60 60 0 8 0 uvmvnodes 72 1988 0 0 37 0 37 37 0 8 0 vnodes 208 1988 0 0 105 0 105 105 0 8 0 namei 1024 6502 0 6502 1 0 1 1 0 8 1 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 528 6 0 0 1 0 1 1 0 8 0 scxspl 192 7537 0 7537 1 0 1 1 0 8 1 plimitpl 152 43 0 36 1 0 1 1 0 8 0 sigapl 432 429 0 416 2 0 2 2 0 8 0 futexpl 56 6930 0 6930 1 0 1 1 0 8 1 knotepl 112 87 0 68 1 0 1 1 0 8 0 kqueuepl 104 60 0 57 1 0 1 1 0 8 0 pipelkpl 16 117 0 107 1 0 1 1 0 8 0 pipepl 120 234 0 215 1 0 1 1 0 8 0 fdescpl 432 430 0 416 2 0 2 2 0 8 0 filepl 120 3162 0 3066 5 0 5 5 0 8 2 lockfpl 104 73 0 72 1 0 1 1 0 8 0 lockfspl 48 26 0 25 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 24 0 14 1 0 1 1 0 8 0 ucredpl 96 297 0 290 1 0 1 1 0 8 0 zombiepl 144 416 0 416 1 0 1 1 0 8 1 processpl 896 445 0 416 4 0 4 4 0 8 0 procpl 624 732 0 696 4 0 4 4 0 8 1 sosppl 128 4 0 4 2 1 1 1 0 8 1 sockpl 400 851 0 834 9 1 8 8 0 8 6 mcl64k 65536 278 0 278 33 27 6 33 0 8 6 mcl16k 16384 2 0 2 1 0 1 1 0 8 1 mcl12k 12288 9 0 9 1 0 1 1 0 8 1 mcl9k 9216 3 0 3 1 0 1 1 0 8 1 mcl8k 8192 16 0 16 1 0 1 1 0 8 1 mcl4k 4096 36 0 36 2 1 1 1 0 8 1 mcl2k2 2112 5 0 5 1 0 1 1 0 8 1 mcl2k 2048 64551 0 64501 15 8 7 13 0 8 0 mtagpl 80 36 0 2 2 1 1 1 0 8 0 mbufpl 256 104422 0 104200 30 14 16 24 0 8 0 bufpl 280 5025 0 179 347 0 347 347 0 8 0 anonpl 16 62483 0 45996 80 11 69 78 0 107 2 anonpl: pool(0xffffffff82564eb8:anonpl): free list modified: page 0xfffffd8066782000; item ordinal 0; addr 0xfffffd8066782000 (p 0xfffffd8066782000); offset 0x0=0x0 anonpl: pool(0xffffffff82564eb8:anonpl): page inconsistency: page 0xfffffd8066782000; item ordinal 1; addr 0x8aea2d6e3e56491d amapchunkpl 152 1891 0 1750 8 1 7 8 0 158 0 amappl16 192 2399 0 1501 57 12 45 53 0 8 0 amappl15 184 52 0 48 1 0 1 1 0 8 0 amappl14 176 31 0 29 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 114 0 111 1 0 1 1 0 8 0 amappl11 152 179 0 165 1 0 1 1 0 8 0 amappl10 144 24 0 21 1 0 1 1 0 8 0 amappl9 136 551 0 548 1 0 1 1 0 8 0 amappl8 128 119 0 96 1 0 1 1 0 8 0 amappl7 120 98 0 86 1 0 1 1 0 8 0 amappl6 112 160 0 152 1 0 1 1 0 8 0 amappl5 104 289 0 279 1 0 1 1 0 8 0 amappl4 96 644 0 619 1 0 1 1 0 8 0 amappl3 88 123 0 115 1 0 1 1 0 8 0 amappl2 80 2606 0 2539 3 1 2 3 0 8 0 amappl1 72 17618 0 17205 26 16 10 20 0 8 0 amappl 80 972 0 926 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 19 0 0 1 0 1 1 0 8 0 uaddrrnd 24 436 0 416 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 436 0 416 1 0 1 1 0 8 0 vmmpekpl 168 6822 0 6793 2 0 2 2 0 8 0 vmmpepl 168 59264 0 57281 123 16 107 117 0 357 20 vmsppl 272 435 0 416 3 1 2 2 0 8 0 pdppl 4096 878 0 838 7 1 6 6 0 8 0 pvpl 32 183106 0 163623 183 8 175 183 0 265 17 pmappl 200 435 0 416 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 214 0 55 6 0 6 6 0 8 0