VFS: brelse: Trying to free free buffer
------------[ cut here ]------------
WARNING: CPU: 0 PID: 31909 at fs/buffer.c:1206 __brelse fs/buffer.c:1206 [inline]
WARNING: CPU: 0 PID: 31909 at fs/buffer.c:1206 __brelse.cold+0x11/0x18 fs/buffer.c:1200
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 31909 Comm: syz-executor.4 Not tainted 4.14.109+ #45
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x10e lib/dump_stack.c:53
 panic+0x1d9/0x3c2 kernel/panic.c:182
 __warn.cold+0x2f/0x3b kernel/panic.c:546
Kernel Offset: 0x1ee00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..