linux-kernel - [lkp-robot] [fbcon] 903a69cad7: BUG:unable_to_handle

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Date:   Wed, 2 Aug 2017 10:30:43 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     David Lechner <david@...hnology.com>
Cc:     linux-fbdev@...r.kernel.org, David Lechner <david@...hnology.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-kernel@...r.kernel.org, lkp@...org
Subject: [lkp-robot] [fbcon]  903a69cad7: BUG:unable_to_handle_kernel


FYI, we noticed the following commit:

commit: 903a69cad7ac6cc504c81d7605be1053ba264466 ("fbcon: add VT notifier for VT_UPDATE event")
url: https://github.com/0day-ci/linux/commits/David-Lechner/fbcon-Invert-margin-colors-when-terminal-is-inverted/20170801-082646


in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-x86_64 -enable-kvm -m 512M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+------------------------------------------+------------+------------+
|                                          | c494f471e2 | 903a69cad7 |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 0          |
| boot_failures                            | 4          | 22         |
| BUG:kernel_hang_in_test_stage            | 4          | 4          |
| BUG:unable_to_handle_kernel              | 0          | 22         |
| Oops:#[##]                               | 0          | 22         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 22         |
| BUG:kernel_in_stage                      | 0          | 2          |
+------------------------------------------+------------+------------+



[    0.199700] BUG: unable to handle kernel NULL pointer dereference at 0000000000000348
[    0.199701] IP: fbcon_clear_margins+0x1c/0x80
[    0.199701] PGD 0 P4D 0 
[    0.199702] Oops: 0000 [#1] SMP
[    0.199702] Modules linked in:
[    0.199702] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc2-00024-g903a69ca #3
[    0.199703] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[    0.199703] task: ffff880011630000 task.stack: ffffc900000d0000
[    0.199703] RIP: 0010:fbcon_clear_margins+0x1c/0x80
[    0.199703] RSP: 0000:ffffc900000d3c30 EFLAGS: 00010046
[    0.199704] RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 00000000ffffffff
[    0.199704] RDX: ffffc900000d3ca8 RSI: 0000000000000000 RDI: ffff880011434800
[    0.199705] RBP: ffffc900000d3c38 R08: 0000000000000000 R09: ffffffff81f95fc0
[    0.199705] R10: ffff8800000ba3a0 R11: 000000008238a601 R12: 0000000000000000
[    0.199705] R13: 0000000000000004 R14: ffffc900000d3ca8 R15: 0000000000000000
[    0.199705] FS:  0000000000000000(0000) GS:ffff88001e000000(0000) knlGS:0000000000000000
[    0.199706] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.199706] CR2: 0000000000000348 CR3: 0000000001e09000 CR4: 00000000000006f0
[    0.199706] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.199707] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    0.199707] Call Trace:
[    0.199707]  ? vt_notifier_call+0x34/0x40
[    0.199707]  notifier_call_chain+0x4a/0x70
[    0.199707]  atomic_notifier_call_chain+0x21/0x30
[    0.199708]  vt_console_print+0x219/0x3c0
[    0.199708]  console_unlock+0x3f9/0x4f0
[    0.199708]  vprintk_emit+0x302/0x3b0
[    0.199708]  ? pnpacpi_add_device_handler+0x23b/0x23b
[    0.199708]  ? set_debug_rodata+0x17/0x17
[    0.199709]  vprintk_default+0x1f/0x30
[    0.199709]  vprintk_func+0x27/0x60
[    0.199709]  printk+0x43/0x4b
[    0.199709]  ? kobject_uevent+0xb/0x10
[    0.199710]  ? kobject_uevent_env+0x153/0x690
[    0.199710]  pnpacpi_init+0x35/0x73
[    0.199710]  do_one_initcall+0x43/0x170
[    0.199710]  ? set_debug_rodata+0x17/0x17
[    0.199710]  kernel_init_freeable+0x198/0x220
[    0.199711]  ? rest_init+0xe0/0xe0
[    0.199711]  kernel_init+0xe/0x101
[    0.199711]  ret_from_fork+0x25/0x30
[    0.199711] Code: ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 0f b7 87 60 01 00 00 48 0f be 80 60 19 4d 82 48 8b 04 c5 20 78 0a 82 <44> 8b 90 48 03 00 00 48 8b 88 50 03 00 00 45 85 d2 75 09 80 bf 
[    0.199717] RIP: fbcon_clear_margins+0x1c/0x80 RSP: ffffc900000d3c30
[    0.199718] CR2: 0000000000000348
[    0.199721] ---[ end trace f2e7a2a7be17dc74 ]---


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.13.0-rc2-00024-g903a69ca" of type "text/plain" (160961 bytes)

View attachment "job-script" of type "text/plain" (3935 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (7500 bytes)