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Wed, 22 Apr 2026 01:32:17 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Wed, 22 Apr 2026 10:32:16 +0200 To: Herbert Xu Cc: Uladzislau Rezki , Thomas Graf , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Andrew Morton , Michal Hocko , Baoquan He , Alexander Potapenko , Andrey Ryabinin , Marco Elver , Michal Hocko , linux-mm@kvack.org Subject: Re: [linus:master] [mm] c6307674ed: BUG:sleeping_function_called_from_invalid_context_at_mm/vmalloc.c Message-ID: References: <202604211323.fac1b29e-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Apr 22, 2026 at 03:59:21PM +0800, Herbert Xu wrote: > On Wed, Apr 22, 2026 at 09:17:54AM +0200, Uladzislau Rezki wrote: > > > > since your GFP_ATOMIC context allocated chunk of memory using vmalloc() > > sense kvfree() uses vfree(). The simplest fix to free via RCU. > > Why is kvmalloc returning vmalloc memory under GFP_ATOMIC? > Is there a new GFP flag to tell it to not return vmalloc memory? > > This has been working for over a decade, what changed? > We have added non-sleeping flags for vmalloc() to extend kvmalloc() functionality as folk need those. Another option, would be: always use vfree_atomic() from the kvfree() path. Any thoughts? -- Uladzislau Rezki