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Mon, 27 Aug 2018 10:58:02 -0700 (PDT) Date: Mon, 27 Aug 2018 10:58:02 -0700 In-Reply-To: <0000000000000956640571197f98@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000074e86d05746e77cc@google.com> Subject: Re: WARNING: kernel stack frame pointer has bad value (2) From: syzbot To: ak@linux.intel.com, dvyukov@google.com, ebiggers@google.com, hpa@zytor.com, jgross@suse.com, keescook@chromium.org, linux-kernel@vger.kernel.org, luto@kernel.org, megha.dey@linux.intel.com, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 2ad0d5269970 Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=14f7f36a400000 kernel config: https://syzkaller.appspot.com/x/.config?x=79e695838ce7a210 dashboard link: https://syzkaller.appspot.com/bug?extid=903cdd6bce9a6eb832a4 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c5a07a400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+903cdd6bce9a6eb832a4@syzkaller.appspotmail.com 0000000077534c7d: ffff8801d3be2188 (0xffff8801d3be2188) 00000000d99670e0: ffff8801cf5dbdf0 (0xffff8801cf5dbdf0) 0000000092c01301: ffff8801cf5dbd10 (0xffff8801cf5dbd10) 0000000039ac4013: ffffffff86c00d4a (do_softirq_own_stack+0x2a/0x40) 00000000f205f6c7: ffff8801cf5dbd10 (0xffff8801cf5dbd10) WARNING: kernel stack frame pointer at 0000000092c01301 in syz-executor0:4993 has bad value 0000000097e4bf07 ================================================================== BUG: KASAN: stack-out-of-bounds in schedule_debug kernel/sched/core.c:3283 [inline] BUG: KASAN: stack-out-of-bounds in __schedule+0x1a18/0x1ec0 kernel/sched/core.c:3393 Read of size 8 at addr ffff8801cf630000 by task syz-executor0/4993 CPU: 1 PID: 4993 Comm: syz-executor0 Not tainted 4.18.0+ #190 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: The buggy address belongs to the page: page:ffffea00073d8c00 count:1 mapcount:-512 mapping:0000000000000000 index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 dead000000000100 dead000000000200 0000000000000000 raw: 0000000000000000 0000000000000000 00000001fffffdff ffff8801aee52b80 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8801aee52b80 Memory state around the buggy address: ffff8801cf62ff00: f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00 ffff8801cf62ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8801cf630000: f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 04 f2 f2 f2 ^ ffff8801cf630080: f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00 00 00 ffff8801cf630100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 ==================================================================