------------[ cut here ]------------
WARNING: CPU: 1 PID: 26021 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: 1 PID: 26021 Comm: syz-executor0 Not tainted 4.9.131+ #50
 ffff8801ce867620 ffffffff81b37029 ffffffff82a38c20 00000000ffffffff
 0000000000000000 0000000000000001 000000000000010a ffff8801ce8676e0
 ffffffff813f6b25 0000000041b58ab3 ffffffff82e298d3 ffffffff813f6966
Call Trace:
 [<ffffffff81b37029>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b37029>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f6b25>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f6df4>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff810dbf4c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff8178f079>] __ext4_handle_dirty_metadata+0x3e9/0x4c0 fs/ext4/ext4_jbd2.c:266
 [<ffffffff816c3da1>] write_end_fn+0x71/0xa0 fs/ext4/inode.c:1310
 [<ffffffff816cc33c>] ext4_walk_page_buffers+0x9c/0x1a0 fs/ext4/inode.c:1030
 [<ffffffff816e1fe1>] ext4_journalled_write_end+0x311/0x1230 fs/ext4/inode.c:1464
 [<ffffffff8140f72c>] generic_perform_write+0x34c/0x500 mm/filemap.c:2764
 [<ffffffff814125b2>] __generic_file_write_iter+0x352/0x540 mm/filemap.c:2878
 [<ffffffff816b32ad>] ext4_file_write_iter+0x63d/0xd70 fs/ext4/file.c:165
 [<ffffffff81508477>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff81508477>] __vfs_write+0x3d7/0x580 fs/read_write.c:509
 [<ffffffff8150acc7>] vfs_write+0x187/0x520 fs/read_write.c:557
 [<ffffffff8150eaf9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff8150eaf9>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff828037d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..