linux-kernel - [LKP] [drm/bochs] 6579c39594: WARNING:at_drivers/gpu/drm/drm_mode_config.c:#drm_mode_config

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Date:   Tue, 12 Feb 2019 15:44:34 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [LKP] [drm/bochs] 6579c39594:
 WARNING:at_drivers/gpu/drm/drm_mode_config.c:#drm_mode_config_cleanup

FYI, we noticed the following commit (built with gcc-8):

commit: 6579c39594aeb9da617e319dbb679ded14c05105 ("drm/bochs: atomic: switch planes to atomic, wire up helpers.")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

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 -cpu SandyBridge -smp 2 -m 4G

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


+--------------------------------------------------------------------------------------------+------------+------------+
|                                                                                            | 6309200184 | 6579c39594 |
+--------------------------------------------------------------------------------------------+------------+------------+
| boot_successes                                                                             | 0          | 0          |
| boot_failures                                                                              | 10         | 12         |
| kobject((____ptrval____)):tried_to_init_an_initialized_object,something_is_seriously_wrong | 10         | 12         |
| BUG:unable_to_handle_kernel                                                                | 2          | 1          |
| Oops:#[##]                                                                                 | 2          | 1          |
| RIP:dd_insert_requests                                                                     | 2          | 1          |
| Kernel_panic-not_syncing:Fatal_exception                                                   | 2          | 1          |
| WARNING:at_drivers/gpu/drm/drm_mode_config.c:#drm_mode_config_cleanup                      | 0          | 12         |
| RIP:drm_mode_config_cleanup                                                                | 0          | 12         |
+--------------------------------------------------------------------------------------------+------------+------------+



[   22.270322] WARNING: CPU: 1 PID: 1 at drivers/gpu/drm/drm_mode_config.c:456 drm_mode_config_cleanup+0xa4/0x2a4
[   22.272861] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.0.0-rc1-00131-g6579c39 #1
[   22.272861] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   22.272861] RIP: 0010:drm_mode_config_cleanup+0xa4/0x2a4
[   22.272861] Code: ff eb e8 48 89 e7 e8 22 9c ff ff 48 8d bb 80 08 00 00 e8 7e d4 8b ff 48 8b 83 68 08 00 00 48 8d 93 68 08 00 00 48 39 c2 74 37 <0f> 0b 48 89 e6 48 89 df 48 c7 c5 93 bc 65 83 e8 0c 9b ff ff 48 89
[   22.272861] RSP: 0000:ffff88813a243cd8 EFLAGS: 00010206
[   22.272861] RAX: ffff8881247a2738 RBX: ffff888139d9c000 RCX: 0000000000001150
[   22.272861] RDX: ffff888139d9c868 RSI: 000000007fffffff RDI: ffff888139d9c880
[   22.272861] RBP: ffff888139d9c8d0 R08: 00000000be162c32 R09: 0000000000000004
[   22.272861] R10: ffffffff840eebd4 R11: 0000000000000002 R12: ffff888139d9c8d8
[   22.272861] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
[   22.272861] FS:  0000000000000000(0000) GS:ffff88813b200000(0000) knlGS:0000000000000000
[   22.272861] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   22.272861] CR2: 00000000ffffffff CR3: 0000000003a8a000 CR4: 00000000000406e0
[   22.272861] Call Trace:
[   22.272861]  bochs_kms_fini+0x1b/0x25
[   22.272861]  bochs_unload+0x1e/0x41
[   22.272861]  bochs_pci_remove+0x1d/0x26
[   22.272861]  pci_device_remove+0x36/0x8e
[   22.272861]  really_probe+0x1d4/0x3ea
[   22.272861]  driver_probe_device+0xd4/0x104
[   22.272861]  __driver_attach+0xcb/0xfc
[   22.272861]  ? driver_probe_device+0x104/0x104
[   22.272861]  bus_for_each_dev+0x71/0xa3
[   22.272861]  bus_add_driver+0x134/0x20e
[   22.272861]  ? qxl_init+0x47/0x47
[   22.272861]  driver_register+0x99/0xcb
[   22.272861]  ? qxl_init+0x47/0x47
[   22.272861]  do_one_initcall+0xb3/0x1c6
[   22.272861]  kernel_init_freeable+0x207/0x297
[   22.272861]  ? rest_init+0x13b/0x13b
[   22.272861]  kernel_init+0xa/0xff
[   22.272861]  ret_from_fork+0x1f/0x30
[   22.272861] _warn_unseeded_randomness: 16 callbacks suppressed
[   22.272861] random: get_random_bytes called from init_oops_id+0x22/0x31 with crng_init=0
[   22.272861] ---[ end trace c320b1bd2fc19904 ]---


To reproduce:

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



Thanks,
Rong Chen

View attachment "config-5.0.0-rc1-00131-g6579c39" of type "text/plain" (133027 bytes)

View attachment "job-script" of type "text/plain" (4421 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (30672 bytes)