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Date: Wed, 18 Nov 2015 13:32:46 -0500 From: Jeff Moyer <jmoyer@...hat.com> To: Ross Zwisler <ross.zwisler@...ux.intel.com> Cc: Dan Williams <dan.j.williams@...el.com>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-nvdimm <linux-nvdimm@...1.01.org>, linux-ext4 <linux-ext4@...r.kernel.org>, Ross Zwisler <ross.zwisler@...el.com> Subject: Re: dax pmd fault handler never returns to userspace Ross Zwisler <ross.zwisler@...ux.intel.com> writes: > Yea, my first round of testing was broken, sorry about that. > > It looks like this test causes the PMD fault handler to be called repeatedly > over and over until you kill the userspace process. This doesn't happen for > XFS because when using XFS this test doesn't hit PMD faults, only PTE faults. Hmm, I wonder why not? Sounds like that will need investigating as well, right? -Jeff > So, looks like a livelock as far as I can tell. > > Still debugging. Thanks! Jeff -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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