From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753712AbeDSQGE (ORCPT ); Thu, 19 Apr 2018 12:06:04 -0400 Received: from mail-it0-f71.google.com ([209.85.214.71]:58494 "EHLO mail-it0-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753423AbeDSQGC (ORCPT ); Thu, 19 Apr 2018 12:06:02 -0400 X-Google-Smtp-Source: AB8JxZo/IrOI3Y/u4zu/dP2RFNrL2GrVcR9cai1N+88V6tunSqBFRyglNA9BvUf5T09jYUQ0XWGg7jaZHr3eMNu8RGmp28FHFBLi MIME-Version: 1.0 Date: Thu, 19 Apr 2018 09:06:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000080e6b5056a35bf0b@google.com> Subject: WARNING in reconnect_path From: syzbot To: akpm@linux-foundation.org, bfields@citi.umich.edu, dhowells@redhat.com, linux-kernel@vger.kernel.org, neilb@suse.de, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot hit the following crash on upstream commit b5dbc28762fd3fd40ba76303be0c7f707826f982 (Sat Mar 31 04:53:57 2018 +0000) Merge tag 'kbuild-fixes-v4.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=3d2f4fb8f8cb02694334 So far this crash happened 3 times on upstream. Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5514244279762944 Kernel config: https://syzkaller.appspot.com/x/.config?id=-2760467897697295172 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3d2f4fb8f8cb02694334@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. WARNING: CPU: 1 PID: 8789 at fs/exportfs/expfs.c:96 clear_disconnected fs/exportfs/expfs.c:96 [inline] WARNING: CPU: 1 PID: 8789 at fs/exportfs/expfs.c:96 reconnect_path+0x48e/0x670 fs/exportfs/expfs.c:232 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 8789 Comm: syz-executor6 Not tainted 4.16.0-rc7+ #8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x1f4/0x2b0 lib/bug.c:186 fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178 fixup_bug arch/x86/kernel/traps.c:247 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986 RIP: 0010:clear_disconnected fs/exportfs/expfs.c:96 [inline] RIP: 0010:reconnect_path+0x48e/0x670 fs/exportfs/expfs.c:232 RSP: 0018:ffff8801d7a87ad0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff8801ac9ad5c0 RCX: ffffffff822aaa3e RDX: 0000000000040000 RSI: ffffc900066cc000 RDI: ffff8801ac9ad600 RBP: ffff8801d7a87b28 R08: ffffffff8858c3c0 R09: 1ffff1003af50f1d R10: ffff8801d7a87870 R11: 0000000000000000 R12: ffff8801ac9ad5c0 R13: dffffc0000000000 R14: ffff8801ac9ad5c0 R15: ffff880178769a20 exportfs_decode_fh+0x28a/0x5b0 fs/exportfs/expfs.c:448 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x374/0x8a0 fs/fhandle.c:223 SYSC_open_by_handle_at fs/fhandle.c:265 [inline] SyS_open_by_handle_at+0x27/0x30 fs/fhandle.c:256 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454e79 RSP: 002b:00007f73f54f1c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007f73f54f26d4 RCX: 0000000000454e79 RDX: 0000000000200000 RSI: 0000000020000040 RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016 R13: 0000000000000416 R14: 00000000006f82b0 R15: 0000000000000025 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.