panic: pool_do_get: anonpl free list modified: page 0xfffffd8056c0a000; item addr 0xfffffd8056c0a000; offset 0x0=0x0 != 0x2903e5a9153498ab Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *390000 61273 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822222c3) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff825921e8,2,ffff80001e444df8) at pool_do_get+0x42a sys/kern/subr_pool.c:746 pool_get(ffffffff825921e8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 uvm_analloc() at uvm_analloc+0x29 sys/uvm/uvm_anon.c:64 uvm_fault(fffffd8067091998,2037a000,0,1) at uvm_fault+0xfa9 sys/uvm/uvm_fault.c:1114 pageflttrap(ffff80001e445190,0) at pageflttrap+0x239 sys/arch/amd64/amd64/trap.c:199 kerntrap(ffff80001e445190) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e4454e0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf8c61e3f290, 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 0xfffffd8056c0a000; item addr 0xfffffd8056c0a000; offset 0x0=0x0 != 0x2903e5a9153498ab ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822222c3) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff825921e8,2,ffff80001e444df8) at pool_do_get+0x42a sys/kern/subr_pool.c:746 pool_get(ffffffff825921e8,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 uvm_analloc() at uvm_analloc+0x29 sys/uvm/uvm_anon.c:64 uvm_fault(fffffd8067091998,2037a000,0,1) at uvm_fault+0xfa9 sys/uvm/uvm_fault.c:1114 pageflttrap(ffff80001e445190,0) at pageflttrap+0x239 sys/arch/amd64/amd64/trap.c:199 kerntrap(ffff80001e445190) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e4454e0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf8c61e3f290, count: -12 ddb> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff80001e444c60 rbx 0xffff80001e444d10 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80001e470000 rax 0xffff8000009f1080 r8 0xffff80001e444c20 r9 0x1 r10 0xffff8000009f1080 r11 0x6339a8461b8eae40 r12 0x3000000008 r13 0xffff80001e444c70 r14 0x100 r15 0x1 rip 0xffffffff818838e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e444c50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=390000 stat=onproc flags process=0 proc=4000000 pri=82, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff80001d438780,0xffffffff825445f8 process=0xffff80001d39b7b8 user=0xffff80001e440000, vmspace=0xfffffd8067091998 estcpu=32, cpticks=0, pctcpu=0.13 user=0, sys=13, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 61273 252459 26322 0 2 0 syz-executor.1 *61273 390000 26322 0 7 0x4000000 syz-executor.1 29546 253540 47332 0 2 0x482 syz-executor.0 26322 202245 47332 0 2 0x482 syz-executor.1 62483 129279 0 0 3 0x14200 bored sosplice 47332 70935 87752 0 3 0x82 thrsleep syz-fuzzer 47332 515168 87752 0 3 0x4000082 thrsleep syz-fuzzer 47332 284876 87752 0 3 0x4000082 thrsleep syz-fuzzer 47332 281201 87752 0 3 0x4000082 thrsleep syz-fuzzer 47332 140188 87752 0 3 0x4000082 thrsleep syz-fuzzer 47332 130674 87752 0 3 0x4000082 kqread syz-fuzzer 47332 181198 87752 0 3 0x4000082 thrsleep syz-fuzzer 47332 76809 87752 0 2 0x4000482 syz-fuzzer 47332 421757 87752 0 3 0x4000082 thrsleep syz-fuzzer 87752 240179 54000 0 3 0x10008a pause ksh 54000 381231 70626 0 3 0x92 select sshd 45441 436178 1 0 3 0x100083 ttyin getty 70626 366453 1 0 3 0x80 select sshd 37917 329769 46410 73 3 0x100090 kqread syslogd 46410 222024 1 0 3 0x100082 netio syslogd 83334 240344 1 77 3 0x100090 poll dhclient 94115 107290 1 0 3 0x80 poll dhclient 58138 159423 0 0 2 0x14200 zerothread 82660 147942 0 0 3 0x14200 aiodoned aiodoned 95770 168624 0 0 2 0x14200 update 22620 223041 0 0 3 0x14200 cleaner cleaner 21486 46703 0 0 3 0x14200 reaper reaper 97185 211449 0 0 3 0x14200 pgdaemon pagedaemon 86643 448239 0 0 3 0x14200 bored crynlk 88225 244471 0 0 3 0x14200 bored crypto 87464 60711 0 0 3 0x40014200 acpi0 acpi0 89479 60288 0 0 3 0x14200 bored softnet 26631 404529 0 0 3 0x14200 bored systqmp 73740 105460 0 0 3 0x14200 bored systq 48548 461575 0 0 2 0x40014200 softclock 87266 20004 0 0 3 0x40014200 idle0 90701 359260 0 0 2 0x14200 smr 1 47853 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 9506 6424K 6855K 78643K 11174 0 pcb 13 8K 8K 78643K 39 0 rtable 111 3K 3K 78643K 391 0 ifaddr 66 13K 13K 78643K 100 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 26 0 iov 0 0K 12K 78643K 68 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1489 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 6 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 41 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 319 0 sigio 0 0K 0K 78643K 13 0 proc 49 38K 55K 78643K 510 0 subproc 32 2K 2K 78643K 89 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 19 0 in_multi 42 2K 2K 78643K 97 0 ether_multi 1 0K 0K 78643K 4 0 mrt 0 0K 0K 78643K 2 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 245 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 111 54K 56K 78643K 1674 0 UVM aobj 16 2K 2K 78643K 24 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 25 0 NDP 13 0K 0K 78643K 26 0 temp 126 3010K 3074K 78643K 12812 0 kqueue 3 4K 10K 78643K 49 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 16 0 9 1 0 1 1 0 8 0 rtpcb 80 56 0 54 1 0 1 1 0 8 0 rtentry 112 93 0 46 2 0 2 2 0 8 0 unpcb 120 300 0 292 2 1 1 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 2 0 2 2 2 0 1 0 8 0 tcpqe 32 669 0 669 1 1 0 1 0 8 0 tcpcb 544 131 0 127 2 0 2 2 0 8 1 inpcb 280 330 0 323 4 1 3 3 0 8 2 rttmr 72 1 0 1 1 0 1 1 0 8 1 nd6 48 12 0 8 2 1 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 409 0 184 18 3 15 15 0 8 0 art_table 32 411 0 184 2 0 2 2 0 8 0 art_node 16 92 0 50 1 0 1 1 0 8 0 sysvmsgpl 40 60 0 34 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 37 0 27 1 0 1 1 0 8 0 shmpl 112 22 0 8 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1799 0 401 46 0 46 46 0 8 0 ffsino 240 1799 0 401 83 0 83 83 0 8 0 nchpl 144 2401 0 808 60 0 60 60 0 8 0 uvmvnodes 72 2055 0 0 38 0 38 38 0 8 0 vnodes 208 2055 0 0 109 0 109 109 0 8 0 namei 1024 6806 0 6806 2 1 1 1 0 8 1 vcpupl 1984 3 0 0 1 0 1 1 0 8 0 vmpool 528 3 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 11114 0 11114 1 0 1 1 0 8 1 plimitpl 152 45 0 38 1 0 1 1 0 8 0 sigapl 432 481 0 468 2 0 2 2 0 8 0 futexpl 56 7122 0 7122 3 2 1 1 0 8 1 knotepl 112 145 0 126 1 0 1 1 0 8 0 kqueuepl 104 109 0 106 1 0 1 1 0 8 0 pipepl 112 1156 0 1137 4 2 2 3 0 8 1 fdescpl 432 482 0 468 2 0 2 2 0 8 0 filepl 120 4002 0 3906 9 4 5 6 0 8 2 lockfpl 104 94 0 93 1 0 1 1 0 8 0 lockfspl 48 38 0 37 1 0 1 1 0 8 0 sessionpl 112 20 0 10 1 0 1 1 0 8 0 pgrppl 48 28 0 18 1 0 1 1 0 8 0 ucredpl 96 312 0 305 1 0 1 1 0 8 0 zombiepl 144 468 0 467 1 0 1 1 0 8 0 processpl 864 497 0 467 4 0 4 4 0 8 0 procpl 632 822 0 783 4 0 4 4 0 8 0 sosppl 128 12 0 12 2 1 1 1 0 8 1 sockpl 384 695 0 678 10 5 5 6 0 8 3 mcl64k 65536 25 0 25 2 1 1 1 0 8 1 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl12k 12288 11 0 11 2 1 1 1 0 8 1 mcl9k 9216 3 0 3 2 2 0 1 0 8 0 mcl8k 8192 15 0 15 2 1 1 1 0 8 1 mcl4k 4096 33 0 33 3 2 1 1 0 8 1 mcl2k2 2112 3 0 3 1 1 0 1 0 8 0 mcl2k 2048 57355 0 57300 21 13 8 18 0 8 0 mtagpl 80 27 0 17 3 2 1 1 0 8 0 mbufpl 256 93651 0 93498 14 4 10 14 0 8 0 bufpl 280 8697 0 2513 442 0 442 442 0 8 0 anonpl 16 65273 0 52671 77 5 72 76 0 107 13 anonpl: pool(0xffffffff825921e8:anonpl): free list modified: page 0xfffffd8056c0a000; item ordinal 0; addr 0xfffffd8056c0a000 (p 0xfffffd8056c0a000); offset 0x0=0x0 anonpl: pool(0xffffffff825921e8:anonpl): page inconsistency: page 0xfffffd8056c0a000; item ordinal 1; addr 0x92e7e372ab294baa amapchunkpl 152 2898 0 2764 17 4 13 16 0 158 6 amappl16 192 2163 0 1328 42 0 42 42 0 8 0 amappl15 184 56 0 52 1 0 1 1 0 8 0 amappl14 176 172 0 168 1 0 1 1 0 8 0 amappl13 168 10 0 10 2 1 1 1 0 8 1 amappl12 160 9 0 7 1 0 1 1 0 8 0 amappl11 152 138 0 126 1 0 1 1 0 8 0 amappl10 144 14 0 12 1 0 1 1 0 8 0 amappl9 136 625 0 622 1 0 1 1 0 8 0 amappl8 128 161 0 141 1 0 1 1 0 8 0 amappl7 120 111 0 98 1 0 1 1 0 8 0 amappl6 112 133 0 125 1 0 1 1 0 8 0 amappl5 104 181 0 170 1 0 1 1 0 8 0 amappl4 96 613 0 580 1 0 1 1 0 8 0 amappl3 88 306 0 297 1 0 1 1 0 8 0 amappl2 80 2885 0 2815 3 1 2 3 0 8 0 amappl1 72 19028 0 18605 27 18 9 20 0 8 0 amappl 80 1113 0 1069 2 0 2 2 0 84 1 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 23 0 8 1 0 1 1 0 8 0 uaddrrnd 24 485 0 468 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 485 0 468 1 0 1 1 0 8 0 vmmpekpl 168 8770 0 8744 2 0 2 2 0 8 0 vmmpepl 168 65974 0 64036 144 33 111 132 0 357 26 vmsppl 272 484 0 468 2 0 2 2 0 8 0 pdppl 4096 976 0 939 7 2 5 6 0 8 0 pvpl 32 235770 0 220073 284 25 259 284 0 265 116 pmappl 200 484 0 468 2 1 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 164 0 30 5 0 5 5 0 8 0