linux-kernel - Re: Kernel crash due to alloc_tag_top_users() being called when !mem_profiling

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Message-ID: <aFk6krRwyMtbH0y4@pc636>
Date: Mon, 23 Jun 2025 13:29:22 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: Uladzislau Rezki <urezki@...il.com>, Harry Yoo <harry.yoo@...cle.com>,
	kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baoquan He <bhe@...hat.com>, Adrian Huang <ahuang12@...ovo.com>,
	Christop Hellwig <hch@...radead.org>,
	Mateusz Guzik <mjguzik@...il.com>, linux-mm@...ck.org,
	Kent Overstreet <kent.overstreet@...ux.dev>
Subject: Re: Kernel crash due to alloc_tag_top_users() being called when
 !mem_profiling_support?

On Sun, Jun 22, 2025 at 03:54:51PM -0700, Suren Baghdasaryan wrote:
> On Fri, Jun 20, 2025 at 1:47 AM Uladzislau Rezki <urezki@...il.com> wrote:
> >
> > On Fri, Jun 20, 2025 at 12:04:50AM +0900, Harry Yoo wrote:
> > > On Thu, Jun 19, 2025 at 11:10:43PM +0900, Harry Yoo wrote:
> > > > On Wed, Jun 18, 2025 at 02:25:37PM +0800, kernel test robot wrote:
> > > > >
> > > > > Hello,
> > > > >
> > > > > for this change, we reported
> > > > > "[linux-next:master] [lib/test_vmalloc.c]  7fc85b92db: Mem-Info"
> > > > > in
> > > > > https://lore.kernel.org/all/202505071555.e757f1e0-lkp@intel.com/
> > > > >
> > > > > at that time, we made some tests with x86_64 config which runs well.
> > > > >
> > > > > now we noticed the commit is in mainline now.
> > > >
> > > > (Re-sending due to not Ccing people and the list...)
> > > >
> > > > Hi, I'm facing the same error on my testing environment.
> > >
> > > I should have clarified that the reason the kernel failed to allocate
> > > memory on my machine was due to running out of memory, not because of the
> > > vmalloc test module.
> > >
> > > But based on the fact that the test case (align_shift_alloc_test) is
> > > expected to fail, the issue here is not memory allocation failure
> > > itself, but rather that the kernel crashes when the allocation fails.
> > >
> > It looks someone tries to test the CONFIG_TEST_VMALLOC=y as built-in
> > approach test-cases. Yes, it will trigger a lot of warnings as some
> > use cases are supposed to be failed. This will trigger a lot of kernel
> > warnings which can be considered by test-robot or people as problem.
> >
> > In this case i can exclude those use cases or even not run at all unless
> > boot-parameters properly sets if built-in.
> 
> Sorry, I'm catching up on my email backlog. IIUC
> https://lore.kernel.org/all/20250620195305.1115151-1-harry.yoo@oracle.com/
> addresses this issue. Is my understanding correct?
> 
I checked/tested the .config from the test-robot in order to reproduce
the kernel crash. Unfortunately i can not trigger this. But, people from
the another thread already confirmed that it solves the crash.

--
Uladzislau Rezki