From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752338AbeC2XBc (ORCPT ); Thu, 29 Mar 2018 19:01:32 -0400 Received: from mail-io0-f200.google.com ([209.85.223.200]:54707 "EHLO mail-io0-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752259AbeC2XBC (ORCPT ); Thu, 29 Mar 2018 19:01:02 -0400 X-Google-Smtp-Source: AIpwx4/CxzCVXVbIY8KhOpKname1erAoB/kqkD0XiirPfNx4y1aisVnTBfxdsQGkeq2wGTLkWrrkAjs/KSfyz9sxSnUi06vbR/3l MIME-Version: 1.0 Date: Thu, 29 Mar 2018 16:01:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <001a114043bcfab6ab05689518f9@google.com> Subject: WARNING in kill_block_super From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, 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 0b412605ef5f5c64b31f19e2910b1d5eba9929c3 (Thu Mar 29 01:07:23 2018 +0000) Merge tag 'drm-fixes-for-v4.16-rc8' of git://people.freedesktop.org/~airlied/linux syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=5a170e19c963a2e0df79 So far this crash happened 2 times on upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6168466046320640 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=4851040260194304 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5936700618440704 Kernel config: https://syzkaller.appspot.com/x/.config?id=-8440362230543204781 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+5a170e19c963a2e0df79@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. RAX: ffffffffffffffda RBX: 00007ffed0bc62a0 RCX: 0000000000442e79 RDX: 00000000004a4d6d RSI: 0000000020001740 RDI: 0000000020001780 RBP: 0000000000000000 R08: 00007ffed0bc62a0 R09: ffffffffffffffff R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff R13: 0000000000000008 R14: 0000000000001380 R15: 00007ffed0bc5b38 WARNING: CPU: 1 PID: 4445 at fs/super.c:1148 kill_block_super+0xc9/0xf0 fs/super.c:1148 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 4445 Comm: syzkaller195321 Not tainted 4.16.0-rc7+ #5 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.11+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:kill_block_super+0xc9/0xf0 fs/super.c:1148 RSP: 0018:ffff8801aecc77a0 EFLAGS: 00010293 RAX: ffff8801af180040 RBX: ffff8801aede22c0 RCX: ffffffff81b31649 RDX: 0000000000000000 RSI: ffff8801b9a76478 RDI: ffff8801d5527ba0 RBP: ffff8801aecc77b8 R08: 0000000000000000 R09: 1ffff10035d98ea5 R10: ffff8801aecc7568 R11: 0000000000000001 R12: ffff8801d5527800 R13: 0000000000000000 R14: ffff8801aecc7a10 R15: ffff8801aede22c0 fuse_kill_sb_blk+0x90/0xb0 fs/fuse/inode.c:1232 deactivate_locked_super+0x88/0xd0 fs/super.c:312 sget_userns+0xbda/0xe40 fs/super.c:522 sget+0xd2/0x120 fs/super.c:557 mount_bdev+0x109/0x370 fs/super.c:1092 fuse_mount_blk+0x34/0x40 fs/fuse/inode.c:1219 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2509 [inline] do_new_mount fs/namespace.c:2512 [inline] do_mount+0xea4/0x2bb0 fs/namespace.c:2842 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x442e79 RSP: 002b:00007ffed0bc59e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffed0bc62a0 RCX: 0000000000442e79 RDX: 00000000004a4d6d RSI: 0000000020001740 RDI: 0000000020001780 RBP: 0000000000000000 R08: 00007ffed0bc62a0 R09: ffffffffffffffff R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff R13: 0000000000000008 R14: 0000000000001380 R15: 00007ffed0bc5b38 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 If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. 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.