From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18D1DC433EF for ; Fri, 22 Oct 2021 15:02:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 842A460F4F for ; Fri, 22 Oct 2021 15:02:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 842A460F4F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id CF06C900004; Fri, 22 Oct 2021 11:02:23 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CA08F900003; Fri, 22 Oct 2021 11:02:23 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BDC75900004; Fri, 22 Oct 2021 11:02:23 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0139.hostedemail.com [216.40.44.139]) by kanga.kvack.org (Postfix) with ESMTP id B19A6900003 for ; Fri, 22 Oct 2021 11:02:23 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 6A1208249980 for ; Fri, 22 Oct 2021 15:02:23 +0000 (UTC) X-FDA: 78724389366.08.0442E72 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by imf04.hostedemail.com (Postfix) with ESMTP id 93CCF50000B0 for ; Fri, 22 Oct 2021 15:02:19 +0000 (UTC) Received: by mail-io1-f71.google.com with SMTP id x21-20020a0566022c5500b005ddd625f399so3364907iov.3 for ; Fri, 22 Oct 2021 08:02:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=2/UMd3kCNFIHHe6IM+o1hXOxqnqMFJUPiU4YXtfs6FI=; b=I/IyQiijbU0sYfJnM7QLPH4X5D2eYJ33ZdQ20jAbs3EFNqOWmlPXeRjb9aAGcZ+fon b9U4kRVB7fDzMq/WykytCcOWAxrNuFTdZ4zP7ip+BBN23cXDPG7v0/0cKovPXwOnpc7l rIojcGEVO9qhtuXLszbvYl5CeoU0beED/s0p8+F1Es4F18xA1i3u4B3NiQR+c/oeo9PH eJOAXnaqH+4GfKwGTQZQug++NKDiKc0tYC9FclhG5Pesr0ioH2g7/c2pcNbVOKxcVZLN H9K4/F7BzEKTGNW5uc8u+PDBpdW5cNO582FKUEj2bGzTTPf5d9JA7pUkYFP+lzr5HE1K 76ig== X-Gm-Message-State: AOAM533K1U1VPz6eYzPANzDlZGIloHuXDTbjpFjRl87ahrFfK95SMCeB BVnC5m0aWDZvstOzNCTuNo6B4bLxCfRwC05DmFO8JnioCxdS X-Google-Smtp-Source: ABdhPJxSafDhS0uIGz9UZEW6EGkJgE4DV1VUPlqRK3DBS65LfcIKjJCSe1Y28F7ENYw8nT8O9o5KDwWNnGb5LJD2rgdEz0C0ytG2 MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1d13:: with SMTP id i19mr352425ila.182.1634914942502; Fri, 22 Oct 2021 08:02:22 -0700 (PDT) Date: Fri, 22 Oct 2021 08:02:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000062d0fc05cef24c57@google.com> Subject: [syzbot] WARNING: refcount bug in sys_memfd_secret From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 93CCF50000B0 Authentication-Results: imf04.hostedemail.com; dkim=none; spf=pass (imf04.hostedemail.com: domain of 3ftJyYQkbAAEtz0lbmmfsbqqje.hpphmfvtfsdpoufou.dpn@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.166.71 as permitted sender) smtp.mailfrom=3ftJyYQkbAAEtz0lbmmfsbqqje.hpphmfvtfsdpoufou.dpn@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none) X-Stat-Signature: rgx7ejfe86ghtf9pscjtap7tx68a74fd X-Rspamd-Server: rspam06 X-HE-Tag: 1634914939-264436 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: Hello, syzbot found the following issue on: HEAD commit: 64222515138e Merge tag 'drm-fixes-2021-10-22' of git://ano.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=178e86c4b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=be398dd7862f4b36 dashboard link: https://syzkaller.appspot.com/bug?extid=b904a1de3ec43711eba5 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b904a1de3ec43711eba5@syzkaller.appspotmail.com ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 2 PID: 32193 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Modules linked in: CPU: 2 PID: 32193 Comm: syz-executor.0 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Code: 09 31 ff 89 de e8 f7 b9 9b fd 84 db 0f 85 36 ff ff ff e8 3a b2 9b fd 48 c7 c7 c0 65 e3 89 c6 05 6f 6c 7f 09 01 e8 7e 4a 19 05 <0f> 0b e9 17 ff ff ff e8 1b b2 9b fd 0f b6 1d 54 6c 7f 09 31 ff 89 RSP: 0018:ffffc90009f9ff10 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff815dbf58 RDI: fffff520013f3fd4 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff815d5cce R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f476a1e7700(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32c24000 CR3: 00000000494c4000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_add include/linux/refcount.h:199 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] __do_sys_memfd_secret mm/secretmem.c:221 [inline] __se_sys_memfd_secret mm/secretmem.c:194 [inline] __x64_sys_memfd_secret+0x182/0x1e0 mm/secretmem.c:194 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f476cc71a39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f476a1e7188 EFLAGS: 00000246 ORIG_RAX: 00000000000001bf RAX: ffffffffffffffda RBX: 00007f476cd74f60 RCX: 00007f476cc71a39 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f476cccbe8f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5b5eb85f R14: 00007f476a1e7300 R15: 0000000000022000 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.