FAT-fs (loop4): invalid media value (0xf2) FAT-fs (loop4): Can't find a valid FAT filesystem ------------[ cut here ]------------ WARNING: CPU: 0 PID: 24819 at fs/ext4/ext4_jbd2.c:266 __ext4_handle_dirty_metadata+0x3e9/0x4c0 fs/ext4/ext4_jbd2.c:266 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 24819 Comm: syz-executor5 Not tainted 4.9.124+ #33 ffff8801af6ef4e8 ffffffff81af4b39 ffffffff82838de0 00000000ffffffff 0000000000000000 0000000000000000 000000000000010a ffff8801af6ef5a8 ffffffff813f2165 0000000041b58ab3 ffffffff82c288a3 ffffffff813f1fa6 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bf/0x39f kernel/panic.c:179 [] __warn.cold.9+0xc1/0x17f kernel/panic.c:542 [] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [] __ext4_handle_dirty_metadata+0x3e9/0x4c0 fs/ext4/ext4_jbd2.c:266 [] write_end_fn+0x71/0xa0 fs/ext4/inode.c:1310 [] ext4_walk_page_buffers+0x9c/0x1a0 fs/ext4/inode.c:1030 [] ext4_journalled_write_end+0x311/0x1230 fs/ext4/inode.c:1464 [] generic_perform_write+0x34c/0x500 mm/filemap.c:2764 [] __generic_file_write_iter+0x352/0x540 mm/filemap.c:2878 [] ext4_file_write_iter+0x63d/0xd70 fs/ext4/file.c:165 [] aio_write+0x2f2/0x510 fs/aio.c:1505 [] io_submit_one fs/aio.c:1586 [inline] [] do_io_submit+0xd35/0x1080 fs/aio.c:1654 [] SYSC_io_submit fs/aio.c:1679 [inline] [] SyS_io_submit+0x27/0x30 fs/aio.c:1676 [] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..