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[209.85.220.65]) by mx.google.com with SMTPS id j79sor23528646jad.11.2019.01.06.07.44.24 for (Google Transport Security); Sun, 06 Jan 2019 07:44:24 -0800 (PST) Received-SPF: pass (google.com: domain of dvyukov@google.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=lTW+tCJ2; spf=pass (google.com: domain of dvyukov@google.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=dvyukov@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=jt1Op2qUk5ZeAXlGxnugwXC5LTtag5tIshqbzARd1kc=; b=lTW+tCJ2i5S6MzinTMSyp/aHgOQJZQxRb3qwxlvEFNq7Fh1o3oxuAXM0R8tebEp4PW RqL/nSn2bv6P+aH1G1HA7t4UT/jsg3i+/lmVF9rgeMJtTBU89cCUTuZFduB3/LLME+R5 dQJiXB+x49zkuVPuicbwuO2cbeLoSE8Avl27ab4XBbfyzQt1AikPfKzI0re4TVXDJgit /KZu10fd3FMeY372KnpXZQ1YnDE/EuZ68hkPhnwRuY4Nb5A7BlywJTVUNw+qw10AvgaS Arch87ZqL0awCk5kcx41r5jiT+dnB5t9flsulHTZ7uYNRHru1JezDgJjf6MGIOwBYHXi DiRg== X-Google-Smtp-Source: ALg8bN4qW4aH3LNlHDvqE9PZrmRjfkCJd9owY2xcF4nOthC1M8heMo2neE4rb1M2HzD5htTBcmbcJtET0i/MPsRsV6g= X-Received: by 2002:a02:97a2:: with SMTP id s31mr25771613jaj.82.1546789463911; Sun, 06 Jan 2019 07:44:23 -0800 (PST) MIME-Version: 1.0 References: <000000000000ae2357057eca1fa5@google.com> <40577a65-3947-aec9-3b82-ac71f150e586@I-love.SAKURA.ne.jp> In-Reply-To: <40577a65-3947-aec9-3b82-ac71f150e586@I-love.SAKURA.ne.jp> From: Dmitry Vyukov Date: Sun, 6 Jan 2019 16:44:13 +0100 Message-ID: Subject: Re: KASAN: stack-out-of-bounds Read in check_stack_object To: Tetsuo Handa Cc: syzbot , Chris von Recklinghausen , Kees Cook , LKML , Linux-MM , syzkaller-bugs Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Message-ID: <20190106154413.2dlAofxV9dT9o2gKt1nUndZFe4WMN69MTohGqFUQ4SA@z> On Sun, Jan 6, 2019 at 3:37 PM Tetsuo Handa wrote: > > On 2019/01/06 22:48, Dmitry Vyukov wrote: > > On Sun, Jan 6, 2019 at 2:31 PM syzbot > > wrote: > >> > >> Hello, > >> > >> syzbot found the following crash on: > >> > >> HEAD commit: 3fed6ae4b027 ia64: fix compile without swiotlb > >> git tree: upstream > >> console output: https://syzkaller.appspot.com/x/log.txt?x=161ce1d7400000 > >> kernel config: https://syzkaller.appspot.com/x/.config?x=7308e68273924137 > >> dashboard link: https://syzkaller.appspot.com/bug?extid=05fc3a636f5ee8830a99 > >> compiler: gcc (GCC) 9.0.0 20181231 (experimental) > >> userspace arch: i386 > >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b3769f400000 > >> > >> IMPORTANT: if you fix the bug, please add the following tag to the commit: > >> Reported-by: syzbot+05fc3a636f5ee8830a99@syzkaller.appspotmail.com > > > > I suspect this is another incarnation of: > > https://syzkaller.appspot.com/bug?id=4821de869e3d78a255a034bf212a4e009f6125a7 > > Any other ideas? > > > > >> CPU: 0 PID: -1455013312 Comm: Not tainted 4.20.0+ #10 > > "current->pid < 0" suggests that "struct task_struct" was overwritten. > > >> #PF error: [normal kernel read fault] > > >> Thread overran stack, or stack corrupted > > And "struct task_struct" might be overwritten by stack overrun? > > The cause of overrun is unknown, but given that > "fou6: Prevent unbounded recursion in GUE error handler" is not yet > applied to linux.git tree, this might be a dup of that bug. #syz dup: kernel panic: stack is corrupted in udp4_lib_lookup2