Bluetooth: load_link_keys: expected 1303 bytes, got 3 bytes
kvm: failed to shrink bus, removing it completely
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BUG: KASAN: use-after-free in kvm_vm_ioctl_unregister_coalesced_mmio+0x217/0x280 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:178
Read of size 8 at addr ffff88809b10b780 by task syz-executor.1/11598

CPU: 1 PID: 11598 Comm: syz-executor.1 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 kvm_vm_ioctl_unregister_coalesced_mmio+0x217/0x280 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:178
 kvm_vm_ioctl+0x601/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3095
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4665d9
RSP: 002b:00007fdd184c2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9
RDX: 0000000020000080 RSI: 000000004010ae68 RDI: 0000000000000004
RBP: 00007fdd184c21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe7af5fc6f R14: 00007fdd184c2300 R15: 0000000000022000

Allocated by task 11598:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 kvm_vm_ioctl_register_coalesced_mmio+0x51/0x330 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:146
 kvm_vm_ioctl+0xa81/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3086
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 11598:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 kvm_iodevice_destructor include/kvm/iodev.h:73 [inline]
 kvm_io_bus_unregister_dev.cold+0xd8/0xf8 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3718
 kvm_vm_ioctl_unregister_coalesced_mmio+0x17d/0x280 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:180
 kvm_vm_ioctl+0x601/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3095
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff88809b10b780
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff88809b10b780, ffff88809b10b7c0)
The buggy address belongs to the page:
page:ffffea00026c42c0 count:1 mapcount:0 mapping:ffff88809b10b000 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff88809b10b000 0000000000000000 0000000100000020
raw: ffffea0002a8c860 ffffea0002565360 ffff88813fe80340 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809b10b680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809b10b700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88809b10b780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff88809b10b800: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff88809b10b880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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