panic: pool_do_get: pvpl free list modified: page 0xfffffd8052f7e000; item addr 0xfffffd8052f7e010; offset 0x0=0x0 != 0x99251ea9ae6a149d Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *317117 50720 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82220610) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82565330,2,ffff80001e441c88) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff82565330,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc087d0,200c6000,6b34a000,3,21) at pmap_enter+0x160 uvm_fault(fffffd806bc09ee0,200c6000,0,1) at uvm_fault+0x108c sys/uvm/uvm_fault.c:1217 pageflttrap(ffff80001e442100,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e442100) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e442450) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x725fd47a3b0, 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 0xfffffd8052f7e000; item addr 0xfffffd8052f7e010; offset 0x0=0x0 != 0x99251ea9ae6a149d ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82220610) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82565330,2,ffff80001e441c88) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff82565330,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc087d0,200c6000,6b34a000,3,21) at pmap_enter+0x160 uvm_fault(fffffd806bc09ee0,200c6000,0,1) at uvm_fault+0x108c sys/uvm/uvm_fault.c:1217 pageflttrap(ffff80001e442100,0) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff80001e442100) at kerntrap+0xdb sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff80001e442450) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x725fd47a3b0, count: -12 ddb> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff80001e441af0 rbx 0xffff80001e441ba0 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80001d43d000 rax 0xffff8000009f20c0 r8 0xffff80001e441ab0 r9 0x1 r10 0xffff8000009f20c0 r11 0xbe8a6e8422fd9da8 r12 0x3000000008 r13 0xffff80001e441b00 r14 0x100 r15 0x1 rip 0xffffffff8173caf8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e441ae0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=317117 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80001d3499c8,0xffffffff825644b0 process=0xffff8000ffffa390 user=0xffff80001e43d000, vmspace=0xfffffd806bc09ee0 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 50720 470804 82333 0 2 0 syz-executor.0 *50720 317117 82333 0 7 0x4000000 syz-executor.0 3770 262729 55594 0 2 0 syz-executor.1 3770 501832 55594 0 3 0x4000080 msgwait syz-executor.1 55594 386540 97685 0 2 0x482 syz-executor.1 82333 461022 97685 0 2 0x482 syz-executor.0 97685 255776 85988 0 3 0x82 thrsleep syz-fuzzer 97685 6203 85988 0 2 0x4000482 syz-fuzzer 97685 429072 85988 0 3 0x4000082 kqread syz-fuzzer 97685 470637 85988 0 3 0x4000082 thrsleep syz-fuzzer 97685 172787 85988 0 3 0x4000082 thrsleep syz-fuzzer 97685 649 85988 0 3 0x4000082 thrsleep syz-fuzzer 97685 374179 85988 0 3 0x4000082 thrsleep syz-fuzzer 85988 491391 336 0 3 0x10008a pause ksh 336 230703 37163 0 3 0x92 select sshd 90927 173961 1 0 3 0x100083 ttyin getty 37163 30884 1 0 3 0x80 select sshd 92241 306499 2939 73 2 0x100090 syslogd 2939 286282 1 0 3 0x100082 netio syslogd 45257 88914 0 0 2 0x14200 zerothread 45921 289050 0 0 3 0x14200 aiodoned aiodoned 19960 161912 0 0 3 0x14200 syncer update 52483 420968 0 0 3 0x14200 cleaner cleaner 74643 436279 0 0 3 0x14200 reaper reaper 75934 34806 0 0 3 0x14200 pgdaemon pagedaemon 71874 18483 0 0 3 0x14200 bored crynlk 73797 123455 0 0 3 0x14200 bored crypto 64020 279011 0 0 3 0x40014200 acpi0 acpi0 24008 245274 0 0 3 0x14200 bored softnet 84497 310727 0 0 3 0x14200 bored systqmp 84870 2475 0 0 3 0x14200 bored systq 28426 287988 0 0 3 0x40014200 bored softclock 60774 104767 0 0 3 0x40014200 idle0 76392 511299 0 0 3 0x14200 bored smr 1 195003 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 9449 6261K 6844K 78643K 10634 0 pcb 13 8K 8K 78643K 19 0 rtable 105 3K 3K 78643K 199 0 ifaddr 44 10K 10K 78643K 46 0 counters 21 16K 16K 78643K 21 0 ioctlops 0 0K 2K 78643K 17 0 iov 0 0K 2K 78643K 4 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1239 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 0K 0K 78643K 2 0 sem 6 0K 0K 78643K 6 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 57 0 proc 42 30K 63K 78643K 358 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 11 0 in_multi 33 2K 2K 78643K 38 0 ether_multi 1 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 1K 78643K 183 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 95 36K 36K 78643K 986 0 UVM aobj 5 2K 2K 78643K 5 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 8 0 NDP 6 0K 0K 78643K 10 0 temp 71 3005K 3069K 78643K 9209 0 kqueue 4 6K 6K 78643K 4 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 6 0 0 1 0 1 1 0 8 0 rtpcb 80 25 0 25 1 0 1 1 0 8 1 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 39 0 33 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 75 0 75 1 0 1 1 0 8 1 tcpcb 544 18 0 14 1 0 1 1 0 8 0 inpcb 280 113 0 108 2 0 2 2 0 8 1 nd6 48 4 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 212 0 0 14 0 14 14 0 8 0 art_table 32 213 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semapl 112 4 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1449 0 48 46 0 46 46 0 8 0 ffsino 240 1449 0 48 83 0 83 83 0 8 0 nchpl 144 1708 0 97 60 0 60 60 0 8 0 uvmvnodes 72 1509 0 0 28 0 28 28 0 8 0 vnodes 208 1509 0 0 80 0 80 80 0 8 0 namei 1024 4161 0 4161 1 0 1 1 0 8 1 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 528 2 0 0 1 0 1 1 0 8 0 scxspl 192 4875 0 4875 1 0 1 1 0 8 1 plimitpl 152 18 0 12 1 0 1 1 0 8 0 sigapl 432 228 0 216 2 0 2 2 0 8 0 futexpl 56 886 0 886 1 0 1 1 0 8 1 knotepl 112 55 0 34 1 0 1 1 0 8 0 kqueuepl 104 5 0 2 1 0 1 1 0 8 0 pipelkpl 16 79 0 69 1 0 1 1 0 8 0 pipepl 120 158 0 139 1 0 1 1 0 8 0 fdescpl 432 229 0 216 2 0 2 2 0 8 0 filepl 120 1273 0 1184 4 0 4 4 0 8 1 lockfpl 104 14 0 14 1 0 1 1 0 8 1 lockfspl 48 6 0 6 1 0 1 1 0 8 1 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 57 0 51 1 0 1 1 0 8 0 zombiepl 144 216 0 216 1 0 1 1 0 8 1 processpl 896 243 0 216 4 0 4 4 0 8 0 procpl 624 274 0 239 3 0 3 3 0 8 0 sockpl 400 177 0 166 3 0 3 3 0 8 1 mcl64k 65536 2 0 2 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 2 0 2 1 0 1 1 0 8 1 mcl4k 4096 11 0 11 2 1 1 1 0 8 1 mcl2k 2048 62688 0 62645 13 1 12 12 0 8 6 mtagpl 80 5 0 2 2 1 1 1 0 8 0 mbufpl 256 99256 0 99183 10 1 9 9 0 8 1 bufpl 280 4100 0 179 281 0 281 281 0 8 0 anonpl 16 37412 0 23164 59 1 58 58 0 107 0 amapchunkpl 152 1360 0 1230 15 0 15 15 0 158 9 amappl16 192 923 0 147 39 0 39 39 0 8 0 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 40 0 35 1 0 1 1 0 8 0 amappl12 160 14 0 13 2 1 1 1 0 8 0 amappl11 152 46 0 42 1 0 1 1 0 8 0 amappl10 144 23 0 18 1 0 1 1 0 8 0 amappl9 136 562 0 559 1 0 1 1 0 8 0 amappl8 128 105 0 88 1 0 1 1 0 8 0 amappl7 120 100 0 89 1 0 1 1 0 8 0 amappl6 112 53 0 48 1 0 1 1 0 8 0 amappl5 104 129 0 122 1 0 1 1 0 8 0 amappl4 96 436 0 411 1 0 1 1 0 8 0 amappl3 88 129 0 119 1 0 1 1 0 8 0 amappl2 80 1047 0 975 3 0 3 3 0 8 1 amappl1 72 14032 0 13616 26 9 17 20 0 8 7 amappl 80 525 0 484 1 0 1 1 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 231 0 216 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 231 0 216 1 0 1 1 0 8 0 vmmpekpl 168 5718 0 5692 2 0 2 2 0 8 0 vmmpepl 168 35228 0 33331 111 6 105 105 0 357 22 vmsppl 272 230 0 216 2 0 2 2 0 8 1 pdppl 4096 468 0 434 6 0 6 6 0 8 1 pvpl 32 128027 0 110829 142 0 142 142 0 265 3 pvpl: pool(0xffffffff82565330:pvpl): free list modified: page 0xfffffd8052f7e000; item ordinal 0; addr 0xfffffd8052f7e010 (p 0xfffffd8052f7e000); offset 0x0=0x0 pvpl: pool(0xffffffff82565330:pvpl): page inconsistency: page 0xfffffd8052f7e000; item ordinal 1; addr 0xffd286e243f96248 pmappl 200 230 0 216 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 146 0 5 5 0 5 5 0 8 0