kvm [6775]: vcpu0, guest rIP: 0x9112 Hyper-V uhandled wrmsr: 0x4000008f data 0x4141
------------[ cut here ]------------
bdi-block not registered
WARNING: CPU: 0 PID: 6791 at fs/fs-writeback.c:2194 __mark_inode_dirty+0x67a/0x1170 fs/fs-writeback.c:2192
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6791 Comm: syz-executor3 Not tainted 4.14.0+ #183
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+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:177
 fixup_bug arch/x86/kernel/traps.c:246 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:926
RIP: 0010:__mark_inode_dirty+0x67a/0x1170 fs/fs-writeback.c:2192
RSP: 0018:ffff8801d782ef10 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: ffff8801dac051f8 RCX: ffffffff815992ae
RDX: 0000000000000c09 RSI: ffffc90002a73000 RDI: 0000000000000212
RBP: ffff8801d782f178 R08: 1ffff1003af05d75 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c8a02458
R13: ffff8801c8a02400 R14: ffff8801dac052d8 R15: 0000000000000000
 mark_buffer_dirty+0x484/0x5d0 fs/buffer.c:1136
 __block_commit_write.isra.32+0x13b/0x2f0 fs/buffer.c:2060
 block_write_end+0x99/0x1c0 fs/buffer.c:2138
 blkdev_write_end+0xc3/0x280 fs/block_dev.c:593
 generic_perform_write+0x3a4/0x600 mm/filemap.c:3150
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3264
 blkdev_write_iter+0x207/0x3e0 fs/block_dev.c:1893
 call_write_iter include/linux/fs.h:1772 [inline]
 do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:653
 do_iter_write+0x15a/0x540 fs/read_write.c:932
 vfs_iter_write+0x77/0xb0 fs/read_write.c:945
 iter_file_splice_write+0x7db/0xf30 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x125/0x180 fs/splice.c:1018
 splice_direct_to_actor+0x2c1/0x820 fs/splice.c:973
 do_splice_direct+0x2a7/0x3d0 fs/splice.c:1061
 do_sendfile+0x5d5/0xe90 fs/read_write.c:1413
 SYSC_sendfile64 fs/read_write.c:1468 [inline]
 SyS_sendfile64+0xbd/0x160 fs/read_write.c:1460
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452879
RSP: 002b:00007f1b5916fbe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879
RDX: 0000000020528ff8 RSI: 0000000000000014 RDI: 0000000000000014
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000212 R12: 00000000006f3070
R13: 00000000ffffffff R14: 00007f1b591706d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..