From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-f72.google.com ([209.85.166.72]:36664 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726194AbeKGOst (ORCPT ); Wed, 7 Nov 2018 09:48:49 -0500 Received: by mail-io1-f72.google.com with SMTP id w5-v6so18210007ioj.3 for ; Tue, 06 Nov 2018 21:20:03 -0800 (PST) MIME-Version: 1.0 Date: Tue, 06 Nov 2018 21:20:03 -0800 Message-ID: <000000000000381781057a0c452e@google.com> Subject: BUG: unable to handle kernel paging request in locks_remove_file From: syzbot To: bfields@fieldses.org, jlayton@kernel.org, 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-fsdevel-owner@vger.kernel.org List-ID: Hello, syzbot found the following crash on: HEAD commit: d881de30d29e Add linux-next specific files for 20181107 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1103882b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=caa433e1c8778437 dashboard link: https://syzkaller.appspot.com/bug?extid=1d200d0b1db9c9f449d0 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+1d200d0b1db9c9f449d0@syzkaller.appspotmail.com kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle kernel paging request at ffff880194657bb8 PGD be01067 P4D be01067 PUD 1bf029063 PMD 80000001946001e3 Oops: 0011 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8074 Comm: syz-executor4 Not tainted 4.20.0-rc1-next-20181107+ #107 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0xffff880194657bb8 Code: c1 eb 86 af 8c 32 00 f1 ff 1f d0 7c 65 94 01 88 ff ff f8 7d 65 94 01 88 ff ff 00 00 00 00 00 fc ff df 04 00 00 00 00 00 00 00 <78> 7d 65 94 01 88 ff ff bc 9e 2b 81 ff ff ff ff 38 89 d3 8c 01 88 kobject: 'loop5' (00000000fd72d949): kobject_uevent_env RSP: 0018:ffff880194657508 EFLAGS: 00010212 RAX: 0000000000040000 RBX: ffff880194657bb8 RCX: ffffc9000a5f1000 RDX: 000000000000039f RSI: ffffffff81ed5c9e RDI: ffff880194657588 RBP: ffff8801946576f0 R08: ffff88018cd380c0 R09: ffffed003b5e5b67 R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801d9678080 R13: ffff880194657588 R14: 1ffff100328caea5 R15: dffffc0000000000 kobject: 'loop5' (00000000fd72d949): fill_kobj_path: path = '/devices/virtual/block/loop5' FS: 00007f5f1e438700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff880194657bb8 CR3: 00000001cd753000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject: 'loop3' (00000000367508b9): kobject_uevent_env Call Trace: kobject: 'loop3' (00000000367508b9): fill_kobj_path: path = '/devices/virtual/block/loop3' locks_remove_file+0x148/0x5c0 fs/locks.c:2607 __fput+0x2f0/0xa70 fs/file_table.c:271 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 get_signal+0x1550/0x1970 kernel/signal.c:2347 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5f1e437c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000049 RAX: fffffffffffffe00 RBX: 0000000000000002 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5f1e4386d4 R13: 00000000004bdd9e R14: 00000000004ccdb8 R15: 00000000ffffffff Modules linked in: CR2: ffff880194657bb8 ---[ end trace f5c1663e01f0c934 ]--- RIP: 0010:0xffff880194657bb8 Code: c1 eb 86 af 8c 32 00 f1 ff 1f d0 7c 65 94 01 88 ff ff f8 7d 65 94 01 88 ff ff 00 00 00 00 00 fc ff df 04 00 00 00 00 00 00 00 <78> 7d 65 94 01 88 ff ff bc 9e 2b 81 ff ff ff ff 38 89 d3 8c 01 88 RSP: 0018:ffff880194657508 EFLAGS: 00010212 RAX: 0000000000040000 RBX: ffff880194657bb8 RCX: ffffc9000a5f1000 RDX: 000000000000039f RSI: ffffffff81ed5c9e RDI: ffff880194657588 RBP: ffff8801946576f0 R08: ffff88018cd380c0 R09: ffffed003b5e5b67 R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801d9678080 R13: ffff880194657588 R14: 1ffff100328caea5 R15: dffffc0000000000 FS: 00007f5f1e438700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff880194657bb8 CR3: 00000001cd753000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. 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