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Fri, 17 Jan 2025 11:27:57 -0800 (PST) From: Alexandre Ferrieux X-Google-Original-From: Alexandre Ferrieux Message-ID: <3719ee8a-38ef-4aaa-aca4-b6d82df51661@orange.com> Date: Fri, 17 Jan 2025 20:27:56 +0100 Precedence: bulk X-Mailing-List: linux-trace-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Bug: broken /proc/kcore in 6.13 To: Lorenzo Stoakes , Alexandre Ferrieux Cc: Steven Rostedt , linux-trace-users@vger.kernel.org, LKML , linux-mm@kvack.org, Mike Rapoport References: <05ea473e-d7e9-4ca5-ad91-ba8c00618fb4@orange.com> <20250117084038.79f40307@gandalf.local.home> <4fd7e1a3-f7ff-4b9d-9a53-fb73795b5b3d@lucifer.local> <789848f7-680c-41a0-8edd-64e8af1f2f4b@orange.com> <9f3ba47b-e0ce-4d7a-b60f-e5b8d96b0f2b@lucifer.local> Content-Language: fr, en-US Organization: Orange In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/01/2025 19:13, Lorenzo Stoakes wrote: > > +cc Mike > > OK so nothing to worry about here - the feature that causes this problem > has been completely disabled. This may not be in Linus's tree yet but will > be for 6.13 release [0]. > > I think the vread_iter() check for 0 can wait for 6.14, as once the area of > memory is identified this should never happen, but we do want to pick up on > it, with a WARN_ON_ONCE() to catch stuff like this right away. > > Thanks so much for the repro, though I observed the 'core /proc/kcore' > command freezing up before any 'disass' in my qemu setup, interestingly! > > [0]:https://lore.kernel.org/all/20250113112934.GA8385@noisy.programming.kicks-ass.net/ Thank you for the fast fix, I'm back on track :) Dump of assembler code for function ice_process_skb_fields: 0xffffffffc0fc1eb0 <+0>: nopw (%rax) 0xffffffffc0fc1eb4 <+4>: nopl 0x0(%rax,%rax,1) 0xffffffffc0fc1eb9 <+9>: push %r14 0xffffffffc0fc1ebb <+11>: push %r13 -Alex