linux-kernel - [lkp] [tty] 761ed4a945: BUG: unable to handle kernel NULL pointer dereference at 000000000000046c

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Date:   Tue, 6 Sep 2016 14:33:13 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Alan Cox <alan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp] [tty]  761ed4a945: BUG: unable to handle kernel NULL pointer
 dereference at 000000000000046c


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 761ed4a94582ab291aa24dcbea4e01e8936488c8 ("tty: serial_core: convert uart_close to use tty_port_close")

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 4G

caused below changes:


+-------------------------------------------------+------------+------------+
|                                                 | b3b5764618 | 761ed4a945 |
+-------------------------------------------------+------------+------------+
| boot_successes                                  | 14         | 5          |
| boot_failures                                   | 188        | 71         |
| BUG:kernel_reboot-without-warning_in_test_stage | 188        | 34         |
| BUG:unable_to_handle_kernel                     | 0          | 37         |
| Oops                                            | 0          | 33         |
| RIP:serial8250_tx_chars                         | 0          | 28         |
| calltrace:SyS_open                              | 0          | 4          |
| calltrace:SyS_read                              | 0          | 5          |
| calltrace:SyS_newfstat                          | 0          | 1          |
| calltrace:ring_buffer_producer_thread           | 0          | 1          |
| calltrace:SyS_newstat                           | 0          | 3          |
| calltrace:SyS_sendmsg                           | 0          | 1          |
| calltrace:SyS_readlinkat                        | 0          | 1          |
| calltrace:SyS_readlink                          | 0          | 1          |
| calltrace:schedule                              | 0          | 1          |
| calltrace:schedule_timeout                      | 0          | 1          |
+-------------------------------------------------+------------+------------+



[  142.283744] systemd-udevd[212]: starting version 215
         Starting Copy rules generated while the root was ro...
         Starting LSB: MD array assembly...
[  143.836086] BUG: unable to handle kernel NULL pointer dereference at 000000000000046c
[  143.845764] IP: [<ffffffff816582d0>] serial8250_tx_chars+0x5a/0x2a2
[  143.845764] PGD 0 
[  143.845764] Oops: 0000 [#1] PREEMPT SMP
[  143.845764] Modules linked in:
[  143.845764] CPU: 0 PID: 189 Comm: systemd-journal Not tainted 4.8.0-rc2-00007-g761ed4a #1
[  143.884224] task: ffff88011f9162c0 task.stack: ffff88011f930000







Thanks,
Xiaolong

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