Running sync on ext4 filesystem causes soft lockups on Red Hat Enterprise Linux 5.4
Issue
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typing 'sync' causes ext4 writes to effectively stall.
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ext4 filesystem write performance drops to 1/100th or less if there are dirty pages and you simply type 'sync'. 'top' shows kjournald2 and sync both taking 100% CPU.
Environment
- Red Hat Enterprise Linux 5.4
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