Messages in this thread | | | Date | Thu, 17 Apr 2014 18:36:38 -0400 (EDT) | From | Mikulas Patocka <> | Subject | Re: an infinite loop in ext4 in 3.14 |
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On Thu, 17 Apr 2014, Theodore Ts'o wrote:
> On Thu, Apr 17, 2014 at 03:23:13PM -0400, Mikulas Patocka wrote: > > > > I hit a bug in ext4 - jbd2 was stuck in an infinite loop when remounting > > the root filesystem read-only during shutdown. > > Is this at all repeatable?
No - it happened just once.
> I suspect what happened is that we're not > checking the error return from jbd2_log_do_checkpoint(), and if it ran > into an error doing the jbd2_log_do_checkpoint --- for example, if it
There were no I/O errors on the console when the lockup happened.
> wasn't able to write to the journal --- say, because __wait_cp_io() > returned -EIO, we might be spinning in the while loop in jbd2_journal_flush: > > > while (!err && journal->j_checkpoint_transactions != NULL) { > > > (as you suspected). > > I can add some error checking, but it would be interesting to know if > you can easily reproduce the problem so we can confirm if that's what > was really going on.
I can write a script that reboots the machine and run it overnight...
> Regards, > > - Ted
Mikulas
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