FAT-fs (loop5): bogus number of reserved sectors
FAT-fs (loop1): bogus number of reserved sectors
FAT-fs (loop1): Can't find a valid FAT filesystem
FAT-fs (loop5): Can't find a valid FAT filesystem
------------[ cut here ]------------
WARNING: CPU: 0 PID: 31516 at fs/ext4/inode.c:922 ext4_dio_get_block_overwrite fs/ext4/inode.c:922 [inline]
WARNING: CPU: 0 PID: 31516 at fs/ext4/inode.c:922 ext4_dio_get_block_overwrite+0x103/0x120 fs/ext4/inode.c:907
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 31516 Comm: syz-executor.0 Not tainted 4.9.155+ #27
 ffff8801b7177188 ffffffff81b47871 0000000000000000 ffffffff82a39be0
 00000000ffffffff 0000000000000000 0000000000000009 ffff8801b7177268
 ffffffff813f746a 0000000041b58ab3 ffffffff82e35b4a ffffffff813f7291
Call Trace:
 [<ffffffff81b47871>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b47871>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813f746a>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<ffffffff813f76ab>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<ffffffff810dae7d>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<ffffffff816cfd93>] ext4_dio_get_block_overwrite fs/ext4/inode.c:922 [inline]
 [<ffffffff816cfd93>] ext4_dio_get_block_overwrite+0x103/0x120 fs/ext4/inode.c:907
 [<ffffffff815d3ce5>] get_more_blocks fs/direct-io.c:653 [inline]
 [<ffffffff815d3ce5>] do_direct_IO fs/direct-io.c:955 [inline]
 [<ffffffff815d3ce5>] do_blockdev_direct_IO fs/direct-io.c:1274 [inline]
 [<ffffffff815d3ce5>] __blockdev_direct_IO+0x3205/0xd300 fs/direct-io.c:1360
 [<ffffffff816e2f38>] ext4_direct_IO_write fs/ext4/inode.c:3508 [inline]
 [<ffffffff816e2f38>] ext4_direct_IO+0xd58/0x29c0 fs/ext4/inode.c:3664
 [<ffffffff81412973>] generic_file_direct_write+0x293/0x520 mm/filemap.c:2655
 [<ffffffff81412e0f>] __generic_file_write_iter+0x20f/0x530 mm/filemap.c:2835
 [<ffffffff816b7ee6>] ext4_file_write_iter+0x646/0xd50 fs/ext4/file.c:165
 [<ffffffff815ffbba>] aio_write+0x2ea/0x530 fs/aio.c:1507
 [<ffffffff8160411f>] io_submit_one fs/aio.c:1588 [inline]
 [<ffffffff8160411f>] do_io_submit+0x74f/0x1120 fs/aio.c:1656
 [<ffffffff81604b18>] SYSC_io_submit fs/aio.c:1681 [inline]
 [<ffffffff81604b18>] SyS_io_submit+0x28/0x30 fs/aio.c:1678
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff82816a93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..