What Freezes the System: Firefox or ext3?
A few days ago, the first Release Candidate for Firefox 3 was launched but some problems still remained unfixed, like the one that caused the browser (and sometimes the entire system) to freeze. Some persons blamed Firefox for the freeze, while others the ext3 filesystem and sqlite.
The problem seems to be related to fsync (), a function that synchronizes changes to a file, transferring the data to a storage device. In a bug report, someone described the way in which the excessive usage of fsync () occurred. For every new page opened, Firefox would use the function approximately eight times, bringing the browser to an unresponsive state until the fsyncs completed. This problem seemed to be "contagious", as it affected other opened applications as well, freezing them. I had this problem with Ubuntu 8.04, which comes with the development version of Firefox, 3.0 Beta 5 (the developers switched from the stable 2.0.0.14 to this one).
The developers from Mozilla will make a patch for this bug in Firefox 3.0.1, and will make sure that the Linux distributors take the patch if their users are using ext3 filesystems.
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