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Mon, 03 Aug 2026 06:40:12 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Mon, 3 Aug 2026 15:40:10 +0200 To: Anshuman Khandual Cc: "Uladzislau Rezki (Sony)" , linux-mm@kvack.org, Andrew Morton , Baoquan He , LKML , syzbot+61c997e6be1d9bb300ba@syzkaller.appspotmail.com Subject: Re: [PATCH] mm/vmalloc: Do not warn on -ENOMEM from va_alloc() Message-ID: References: <20260802104627.63892-1-urezki@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Queue-Id: 83AE180008 X-Rspamd-Server: rspam01 X-Stat-Signature: dgqiy69knkainxugj3p73k8u9kqiwsso X-HE-Tag: 1785764415-577249 X-HE-Meta: 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 c00ceRH6 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 03, 2026 at 09:19:52AM +0530, Anshuman Khandual wrote: > On Sun, Aug 02, 2026 at 12:46:27PM +0200, Uladzislau Rezki (Sony) wrote: > > Since vmalloc() accepts non-blocking GFP flags, allocation > > requests may fail when callers pass restrictive GFP masks. > > > > va_clip() may return -ENOMEM when its GFP_NOWAIT fallback > > allocation fails during NE_FIT_TYPE splitting. This is an > > expected failure, so va_alloc() should return the error > > without triggering a kernel splat. > > Dropping WARN_ON_ONCE() just for -ENOMEM while preserving this > warning for other returned errors does make sense. > > > > > Reported-by: syzbot+61c997e6be1d9bb300ba@syzkaller.appspotmail.com > > Very small nit. > > If there is actual link for the problem report, probably it could > be added as an Link: or Closes: here. > I hope Andrew can help here. If not i will resend! Thank you! -- Uladzislau Rezki