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[67.164.59.41]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2ac1923a917sm7992056eec.6.2025.12.11.13.01.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Dec 2025 13:01:31 -0800 (PST) Date: Thu, 11 Dec 2025 13:01:28 -0800 From: "Vishal Moola (Oracle)" To: Andrew Morton Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Uladzislau Rezki , linux-mm@kvack.org Subject: Re: [linus:master] [mm/vmalloc] a061578043: BUG:spinlock_trylock_failure_on_UP_on_CPU Message-ID: References: <202512101320.e2f2dd6f-lkp@intel.com> <20251211124710.f1a04ebb7d8b57abb2de6baa@linux-foundation.org> Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251211124710.f1a04ebb7d8b57abb2de6baa@linux-foundation.org> On Thu, Dec 11, 2025 at 12:47:10PM -0800, Andrew Morton wrote: > On Wed, 10 Dec 2025 15:30:51 -0800 "Vishal Moola (Oracle)" wrote: > > > > The kernel config and materials to reproduce are available at: > > > https://download.01.org/0day-ci/archive/20251210/202512101320.e2f2dd6f-lkp@intel.com > > > > > > > Hmmm. This looks like a race condition tied to reclaim. I'm assuming > > we fail to allocate a page and kick off kswapd. Then when we fall back > > to the bulk allocator which tries to remove a pcp page at the same time as > > kswapd tries to reclaim it. Maybe? > > > > Does something like this fix it? > > Concerned. If pcp page removal is racing with kswapd reclaim then > that's a problem. Altering a caller so it doesn't tickle this bug > doesn't fix the bug? Agreed. I'll look into it. > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > > index ecbac900c35f..0d1480723ddc 100644 > > --- a/mm/vmalloc.c > > +++ b/mm/vmalloc.c > > @@ -3634,7 +3634,7 @@ vm_area_alloc_pages(gfp_t gfp, int nid, > > struct page *page; > > int i; > > unsigned int large_order = ilog2(nr_remaining); > > - gfp_t large_gfp = vmalloc_gfp_adjust(gfp, large_order) & ~__GFP_DIRECT_RECLAIM; > > + gfp_t large_gfp = vmalloc_gfp_adjust(gfp, large_order) & ~__GFP_RECLAIM; > > > > large_order = min(max_attempt_order, large_order);