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Anatol Pomozov authored
If there are a lot of outstanding buffered IOs when a device is taken offline (due to hardware errors etc), ext4_end_bio prints out a message for each failed logical block. While this is desirable, we see thousands of such lines being printed out before the serial console gets overwhelmed, causing ext4_end_bio() wait for the printk to complete. This in itself isn't a disaster, except for the detail that this function is being called with the queue lock held. This causes any other function in the block layer to spin on its spin_lock_irqsave while the serial console is draining. If NMI watchdog is enabled on this machine then it eventually comes along and shoots the machine in the head. The end result is that losing any one disk causes the machine to go down. This patch rate limits the printk to bandaid around the problem. Tested: xfstests Change-Id: I8ab5690dcf4f3a67e78be147d45e489fdf4a88d8 Signed-off-by:
Anatol Pomozov <anatol.pomozov@gmail.com> Signed-off-by:
"Theodore Ts'o" <tytso@mit.edu>
e8974c39