Re: [drm/fb] 1d46491d4a: WARNING:at_drivers/gpu/drm/drm_fb_helper.c:#drm_fb_helper_damage_work[drm_kms_helper]

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Hi

there should be a line in the kernel log that says something like "Damage blitter failed" with an error code. Is there any chance of recovering it?

Best regards
Thomas

Am 02.12.20 um 03:29 schrieb kernel test robot:

Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 1d46491d4a08d7ee657e09808f87d169444a2652 ("drm/fb-helper: Move damage blit code and its setup into separate routine")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master


in testcase: locktorture
version:
with following parameters:

	runtime: 300s
	test: cpuhotplug

test-description: This torture test consists of creating a number of kernel threads which acquire the lock and hold it for specific amount of time, thus simulating different critical region behaviors.
test-url: https://www.kernel.org/doc/Documentation/locking/locktorture.txt


on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

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


+---------------------------------------------------------------------------------------+------------+------------+
|                                                                                       | fd2d856538 | 1d46491d4a |
+---------------------------------------------------------------------------------------+------------+------------+
| WARNING:at_drivers/gpu/drm/drm_fb_helper.c:#drm_fb_helper_damage_work[drm_kms_helper] | 0          | 26         |
| EIP:drm_fb_helper_damage_work                                                         | 0          | 26         |
+---------------------------------------------------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>


[   28.261007] WARNING: CPU: 0 PID: 122 at drivers/gpu/drm/drm_fb_helper.c:434 drm_fb_helper_damage_work+0x109/0x2d0 [drm_kms_helper]
[   28.263802] Modules linked in: locktorture(E) torture(E) mousedev(E) ppdev(E) psmouse(E) crc32c_intel(E) input_leds(E) bochs_drm(E) drm_vram_helper(E) drm_ttm_helper(E) ttm(E) drm_kms_helper(E) parport_pc(E) rtc_cmos(E) parport(E) drm(E) evbug(E) i6300esb(E) i2c_piix4(E) autofs4(E)
[   28.271897] CPU: 0 PID: 122 Comm: kworker/0:2 Tainted: G            E     5.10.0-rc3-01102-g1d46491d4a08 #1
[   28.273904] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   28.275819] Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]
[   28.279884] EIP: drm_fb_helper_damage_work+0x109/0x2d0 [drm_kms_helper]
[   28.281467] Code: 47 10 8b 58 2c 85 db 0f 84 bc 01 00 00 e8 1f f0 da f4 89 74 24 0c 89 5c 24 08 89 44 24 04 c7 04 24 98 c1 40 df e8 f7 50 1d f5 <0f> 0b 31 c9 c7 04 24 01 00 00 00 ba 01 00 00 00 b8 3c e8 40 df e8
[   28.285055] EAX: 00000036 EBX: c1c91420 ECX: 00000000 EDX: 00000000
[   28.289443] ESI: fffffff4 EDI: d2014000 EBP: d2c0dee4 ESP: d2c0de9c
[   28.291058] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010292
[   28.292717] CR0: 80050033 CR2: b727a028 CR3: 12141000 CR4: 00040690
[   28.294316] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   28.295915] DR6: fffe0ff0 DR7: 00000400
[   28.300768] Call Trace:
[   28.302117]  process_one_work+0x31b/0x7b0
[   28.303532]  ? process_one_work+0x272/0x7b0
[   28.304976]  worker_thread+0x29a/0x5d0
[   28.308712]  ? process_one_work+0x7b0/0x7b0
[   28.310129]  kthread+0x181/0x1a0
[   28.311464]  ? process_one_work+0x7b0/0x7b0
[   28.312878]  ? kthread_create_worker_on_cpu+0x30/0x30
[   28.314318]  ret_from_fork+0x1c/0x28
[   28.315645] CPU: 0 PID: 122 Comm: kworker/0:2 Tainted: G            E     5.10.0-rc3-01102-g1d46491d4a08 #1
[   28.317414] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   28.319096] Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]
[   28.320674] Call Trace:
[   28.321947]  dump_stack+0x6d/0x8b
[   28.323278]  __warn.cold+0x24/0x49
[   28.324639]  ? drm_fb_helper_damage_work+0x109/0x2d0 [drm_kms_helper]
[   28.326167]  ? drm_fb_helper_damage_work+0x109/0x2d0 [drm_kms_helper]
[   28.327670]  ? drm_fb_helper_damage_work+0x109/0x2d0 [drm_kms_helper]
[   28.329165]  report_bug+0xb0/0xf0
[   28.330438]  ? irq_work_queue+0x13/0x70
[   28.331729]  ? exc_overflow+0x60/0x60
[   28.333002]  handle_bug+0x2a/0x50
[   28.334227]  exc_invalid_op+0x28/0x80
[   28.335462]  handle_exception+0x15d/0x15d
[   28.336729] EIP: drm_fb_helper_damage_work+0x109/0x2d0 [drm_kms_helper]
[   28.338148] Code: 47 10 8b 58 2c 85 db 0f 84 bc 01 00 00 e8 1f f0 da f4 89 74 24 0c 89 5c 24 08 89 44 24 04 c7 04 24 98 c1 40 df e8 f7 50 1d f5 <0f> 0b 31 c9 c7 04 24 01 00 00 00 ba 01 00 00 00 b8 3c e8 40 df e8
[   28.341442] EAX: 00000036 EBX: c1c91420 ECX: 00000000 EDX: 00000000
[   28.342910] ESI: fffffff4 EDI: d2014000 EBP: d2c0dee4 ESP: d2c0de9c
[   28.344372] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010292
[   28.345883]  ? cpu_latency_qos_write+0xeb/0xf0
[   28.347203]  ? run_init_process+0x5b/0x158
[   28.348483]  ? run_init_process+0x5b/0x158
[   28.349714]  ? exc_overflow+0x60/0x60
[   28.350895]  ? drm_fb_helper_damage_work+0x109/0x2d0 [drm_kms_helper]
[   28.352244]  process_one_work+0x31b/0x7b0
[   28.353432]  ? process_one_work+0x272/0x7b0
[   28.354599]  worker_thread+0x29a/0x5d0
[   28.355730]  ? process_one_work+0x7b0/0x7b0
[   28.356894]  kthread+0x181/0x1a0
[   28.357942]  ? process_one_work+0x7b0/0x7b0
[   28.359019]  ? kthread_create_worker_on_cpu+0x30/0x30
[   28.360134]  ret_from_fork+0x1c/0x28
[   28.376652] irq event stamp: 9469
[   28.377678] hardirqs last  enabled at (9477): [<d3903085>] console_unlock+0x515/0x650
[   28.378986] hardirqs last disabled at (9484): [<d3902f95>] console_unlock+0x425/0x650
[   28.380284] softirqs last  enabled at (9464): [<d467123d>] __do_softirq+0x3fd/0x57c
[   28.381595] softirqs last disabled at (9381): [<d382793c>] call_on_stack+0x4c/0x60
[   28.382878] ---[ end trace b5fac24d1c204ab3 ]---


To reproduce:

         # build kernel
	cd linux
	cp config-5.10.0-rc3-01102-g1d46491d4a08 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz


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



Thanks,
Oliver Sang


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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