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Date:   Thu, 13 May 2021 15:18:58 +0100
From:   Mel Gorman <mgorman@suse.de>
To:     Uladzislau Rezki <urezki@gmail.com>
Cc:     Stephen Rothwell <sfr@canb.auug.org.au>, akpm@linux-foundation.org,
        hdanton@sina.com, mhocko@suse.com, mm-commits@vger.kernel.org,
        npiggin@gmail.com, oleksiy.avramchenko@sonymobile.com,
        rostedt@goodmis.org, willy@infradead.org
Subject: Re: [failures]
 mm-vmalloc-print-a-warning-message-first-on-failure.patch removed from -mm
 tree
Message-ID: <20210513141858.GM3672@suse.de>
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On Thu, May 13, 2021 at 03:24:18PM +0200, Uladzislau Rezki wrote:
> > > > What can of testing failures does it trigger? Where can i find the
> > > > details, logs or tracers of it?
> > > 
> > > https://lore.kernel.org/linux-next/20210512175359.17793d34@canb.auug.org.au/
> > > 
> > Thanks, Mel.
> > 
> > OK. Now i see. The problem is with this patch:
> > 
> > mm/vmalloc: switch to bulk allocator in __vmalloc_area_node()
> > 
> > <SNIP>
> > 
> > So during the boot process when the module is about to be loaded, the vmalloc allocation
> > gets failed in the __alloc_pages_bulk(). 
> > 
> > Will try to reproduce. It would be good to get a kernel config.
> > Appreciate for any thoughts about it?
> > 
> 
> I see that on the target machine when the problem occurs the PAGE_SIZE is 64K. 
> 
> Can it be somehow connected to it? Also one question, just guessing, the crash
> happens during the boot, therefore the question is: is __alloc_pages_bulk()
> fully initialized by that time? 
> 

A boot test on KVM using my distribution config (openSUSE Leap 15.2)
failed on x86-64 so it's not related to PAGE_SIZE.

-- 
Mel Gorman
SUSE Labs