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Donenfeld" , syzbot , netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, davem@davemloft.net, linux-kernel@vger.kernel.org, pabeni@redhat.com, wireguard@lists.zx2c4.com, jann@thejh.net Subject: Re: [syzbot] [wireguard?] KASAN: slab-use-after-free Write in enqueue_timer Message-ID: <20230524083935.7108f17f@kernel.org> In-Reply-To: <20230524083341.0cd435f7@kernel.org> References: <000000000000c0b11d05fa917fe3@google.com> <20230523090512.19ca60b6@kernel.org> <20230523094108.0c624d47@kernel.org> <20230523094736.3a9f6f8c@kernel.org> <20230524083341.0cd435f7@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 24 May 2023 08:33:41 -0700 Jakub Kicinski wrote: > On Wed, 24 May 2023 10:24:31 +0200 Dmitry Vyukov wrote: > > FWIW There are more report examples on the dashboard. > > There are some that don't mention wireguard nor usbnet, e.g.: > > https://syzkaller.appspot.com/text?tag=CrashReport&x=17dd2446280000 > > So that's probably red herring. But they all seem to mention alloc_netdev_mqs. > > While we have you, let me ask about the possibility of having vmcore > access - I think it'd be very useful to solve this mystery. > With a bit of luck the timer still has the function set. I take that back. Memory state around the buggy address: ffff88801ecc1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801ecc1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801ecc1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801ecc1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801ecc1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb