linux-kernel - [drm_dev_unregister] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_mode_config.c:431 drm_mode_config

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Date:   Tue, 7 Nov 2017 18:21:34 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Alex Deucher <alexander.deucher@....com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Alexandru Moise <00moses.alexander00@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [drm_dev_unregister] WARNING: CPU: 0 PID: 1 at
 drivers/gpu/drm/drm_mode_config.c:431 drm_mode_config_cleanup+0xbe/0x300

Hello,

FYI this happens in v4.14-rc8 -- it's not necessarily a new bug.

[   14.192295] Console: switching to colour frame buffer device 128x48
[   14.199399] bochs-drm 0000:00:02.0: fb0: bochsdrmfb frame buffer device
[   14.200280] [drm] Initialized bochs-drm 1.0.0 20130925 for 0000:00:02.0 on minor 1
[   14.202669] Console: switching to colour VGA+ 80x25
[   14.204660] ------------[ cut here ]------------
[   14.205319] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_mode_config.c:431 drm_mode_config_cleanup+0xbe/0x300
[   14.206848] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc8 #1
[   14.207676] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   14.208789] task: ffff880018513040 task.stack: ffff880018518000
[   14.209587] RIP: 0010:drm_mode_config_cleanup+0xbe/0x300
[   14.210373] RSP: 0000:ffff88001851fc30 EFLAGS: 00010297
[   14.211094] RAX: ffff880018513040 RBX: 0000000000000000 RCX: 0000000000000018
[   14.212028] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000246
[   14.212967] RBP: ffff88001851fc60 R08: 00000000be162c32 R09: 0000000000000001
[   14.213955] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88001165d500
[   14.214931] R13: ffff8800110d2780 R14: ffff88001165dd70 R15: 0000000000000001
[   14.215880] FS:  0000000000000000(0000) GS:ffff880018a00000(0000) knlGS:0000000000000000
[   14.217019] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   14.217829] CR2: 0000000000000000 CR3: 000000000346f000 CR4: 00000000000006f0
[   14.218790] Call Trace:
[   14.219191]  bochs_kms_fini+0x24/0x40
[   14.219753]  bochs_unload+0x24/0x50
[   14.220289]  ? bochs_pci_remove+0x20/0x20
[   14.220875]  drm_dev_unregister+0x71/0x110
[   14.221493]  drm_put_dev+0x57/0x70
[   14.221998]  bochs_pci_remove+0x19/0x20
[   14.222587]  pci_device_remove+0x63/0x120
[   14.223168]  ? pcibios_free_irq+0x10/0x10
[   14.223795]  driver_probe_device+0x205/0x450
[   14.224408]  ? driver_probe_device+0x450/0x450
[   14.225063]  __driver_attach+0xad/0xf0
[   14.225644]  bus_for_each_dev+0x89/0xf0
[   14.226198]  driver_attach+0x22/0x30
[   14.226740]  bus_add_driver+0x10f/0x290
[   14.227420]  driver_register+0xca/0x120
[   14.228156]  __pci_register_driver+0x78/0x80
[   14.229154]  ? qxl_init+0x68/0x68
[   14.229678]  bochs_init+0x49/0x5c
[   14.230318]  do_one_initcall+0xb1/0x1a2
[   14.231243]  kernel_init_freeable+0x153/0x216
[   14.232169]  ? do_early_param+0xbe/0xbe
[   14.232802]  ? rest_init+0xd0/0xd0
[   14.233450]  kernel_init+0x13/0x160
[   14.233991]  ? schedule_tail+0xa/0x70
[   14.234657]  ? rest_init+0xd0/0xd0
[   14.235188]  ret_from_fork+0x2a/0x40
[   14.235738] Code: c3 75 dc e8 b5 6a 74 ff 48 8d 7d d0 e8 ac 86 ff ff 49 8b 84 24 58 08 00 00 49 8d 94 24 58 08 00 00 48 39 c2 74 59 e8 92 6a 74 ff <0f> ff 48 8d 75 d0 4c 89 e7 e8 f4 84 ff ff eb 20 e8 7d 6a 74 ff 
[   14.239079] ---[ end trace d08cd7de7c740e16 ]---
[   14.239774] [drm:drm_mode_config_cleanup] *ERROR* connector Virtual-1 leaked!

Attached the full dmesg and kconfig.

Thanks,
Fengguang

View attachment "dmesg-vm-vp-quantal-x86_64-33:20171106185623:x86_64-randconfig-n0-10312215:4.14.0-rc8:1" of type "text/plain" (99576 bytes)

View attachment ".config" of type "text/plain" (120572 bytes)