When the Reiser FS kernel detects an error on the hard drive, it prints some error messages on the screen. It might be a bug. In the Super Block of Reiser FS file system, there is an Error pasture. It is set when file system kernel notices something bad.
So, what happens in this case? May be the Linux user could not read Syslog and could not see the error message or the error is simple an overture of memory corruption, which could lead system to crash.
In such situations, when you reboot the system, this goes in the merry way, mounting Reiser FS file system with known