On Tue, Oct 31, 2023 at 03:01:36PM +0100, Jan Kara wrote: > On Tue 31-10-23 04:48:44, Marek Marczykowski-Górecki wrote: > > Then tried: > > - PAGE_ALLOC_COSTLY_ORDER=4, order=4 - cannot reproduce, > > - PAGE_ALLOC_COSTLY_ORDER=4, order=5 - cannot reproduce, > > - PAGE_ALLOC_COSTLY_ORDER=4, order=6 - freeze rather quickly > > > > I've retried the PAGE_ALLOC_COSTLY_ORDER=4,order=5 case several times > > and I can't reproduce the issue there. I'm confused... > > And this kind of confirms that allocations > PAGE_ALLOC_COSTLY_ORDER > causing hangs is most likely just a coincidence. Rather something either in > the block layer or in the storage driver has problems with handling bios > with sufficiently high order pages attached. This is going to be a bit > painful to debug I'm afraid. How long does it take for you trigger the > hang? I'm asking to get rough estimate how heavy tracing we can afford so > that we don't overwhelm the system... Sometimes it freezes just after logging in, but in worst case it takes me about 10min of more or less `tar xz` + `dd`. -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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