* [Intel-gfx] [PATCH] drm: Mark up racy check of drm_gem_object.handle_count
@ 2020-03-09 12:01 Chris Wilson
2020-03-09 14:03 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Chris Wilson @ 2020-03-09 12:01 UTC (permalink / raw)
To: dri-devel; +Cc: intel-gfx
[ 1715.899800] BUG: KCSAN: data-race in drm_gem_handle_create_tail / drm_gem_object_handle_put_unlocked
[ 1715.899838]
[ 1715.899861] write to 0xffff8881830f3604 of 4 bytes by task 7834 on cpu 1:
[ 1715.899896] drm_gem_handle_create_tail+0x62/0x250
[ 1715.899927] drm_gem_open_ioctl+0xc1/0x160
[ 1715.899956] drm_ioctl_kernel+0xe4/0x120
[ 1715.899981] drm_ioctl+0x297/0x4c7
[ 1715.900003] ksys_ioctl+0x89/0xb0
[ 1715.900027] __x64_sys_ioctl+0x42/0x60
[ 1715.900052] do_syscall_64+0x6e/0x2c0
[ 1715.900079] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 1715.900100]
[ 1715.900119] read to 0xffff8881830f3604 of 4 bytes by task 8137 on cpu 0:
[ 1715.900149] drm_gem_object_handle_put_unlocked+0x31/0x130
[ 1715.900180] drm_gem_object_release_handle+0x93/0xe0
[ 1715.900208] drm_gem_handle_delete+0x7b/0xe0
[ 1715.900235] drm_gem_close_ioctl+0x61/0x80
[ 1715.900264] drm_ioctl_kernel+0xe4/0x120
[ 1715.900291] drm_ioctl+0x297/0x4c7
[ 1715.900316] ksys_ioctl+0x89/0xb0
[ 1715.900340] __x64_sys_ioctl+0x42/0x60
[ 1715.900363] do_syscall_64+0x6e/0x2c0
[ 1715.900388] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/drm_gem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index a9e4a610445a..37627d06fb06 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -218,7 +218,7 @@ drm_gem_object_handle_put_unlocked(struct drm_gem_object *obj)
struct drm_device *dev = obj->dev;
bool final = false;
- if (WARN_ON(obj->handle_count == 0))
+ if (WARN_ON(READ_ONCE(obj->handle_count) == 0))
return;
/*
--
2.20.1
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply related [flat|nested] 4+ messages in thread* [Intel-gfx] ✓ Fi.CI.BAT: success for drm: Mark up racy check of drm_gem_object.handle_count
2020-03-09 12:01 [Intel-gfx] [PATCH] drm: Mark up racy check of drm_gem_object.handle_count Chris Wilson
@ 2020-03-09 14:03 ` Patchwork
2020-03-09 20:30 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2020-03-16 10:03 ` [Intel-gfx] [PATCH] " Daniel Vetter
2 siblings, 0 replies; 4+ messages in thread
From: Patchwork @ 2020-03-09 14:03 UTC (permalink / raw)
To: Chris Wilson; +Cc: intel-gfx
== Series Details ==
Series: drm: Mark up racy check of drm_gem_object.handle_count
URL : https://patchwork.freedesktop.org/series/74450/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_8097 -> Patchwork_16880
====================================================
Summary
-------
**SUCCESS**
No regressions found.
External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_16880/index.html
Known issues
------------
Here are the changes found in Patchwork_16880 that come from known issues:
### IGT changes ###
#### Issues hit ####
* igt@kms_chamelium@dp-crc-fast:
- fi-cml-u2: [PASS][1] -> [FAIL][2] ([i915#262])
[1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8097/fi-cml-u2/igt@kms_chamelium@dp-crc-fast.html
[2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_16880/fi-cml-u2/igt@kms_chamelium@dp-crc-fast.html
#### Possible fixes ####
* igt@i915_selftest@live@gem_contexts:
- fi-skl-lmem: [INCOMPLETE][3] ([i915#424]) -> [PASS][4]
[3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8097/fi-skl-lmem/igt@i915_selftest@live@gem_contexts.html
[4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_16880/fi-skl-lmem/igt@i915_selftest@live@gem_contexts.html
[i915#262]: https://gitlab.freedesktop.org/drm/intel/issues/262
[i915#424]: https://gitlab.freedesktop.org/drm/intel/issues/424
Participating hosts (46 -> 41)
------------------------------
Additional (4): fi-glk-dsi fi-tgl-y fi-snb-2520m fi-elk-e7500
Missing (9): fi-ilk-m540 fi-hsw-4200u fi-hsw-peppy fi-skl-6770hq fi-byt-squawks fi-bsw-cyan fi-ctg-p8600 fi-byt-clapper fi-bdw-samus
Build changes
-------------
* CI: CI-20190529 -> None
* Linux: CI_DRM_8097 -> Patchwork_16880
CI-20190529: 20190529
CI_DRM_8097: 2e46e269a2843c5d0b6c72bfb7fa9d9913c15415 @ git://anongit.freedesktop.org/gfx-ci/linux
IGT_5499: 2e23cf6f63fc6ba1d9543f8327698d6f21813cec @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
Patchwork_16880: c782f13d5ca005769575d4fc7985995da66a0f6c @ git://anongit.freedesktop.org/gfx-ci/linux
== Linux commits ==
c782f13d5ca0 drm: Mark up racy check of drm_gem_object.handle_count
== Logs ==
For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_16880/index.html
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 4+ messages in thread* [Intel-gfx] ✓ Fi.CI.IGT: success for drm: Mark up racy check of drm_gem_object.handle_count
2020-03-09 12:01 [Intel-gfx] [PATCH] drm: Mark up racy check of drm_gem_object.handle_count Chris Wilson
2020-03-09 14:03 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
@ 2020-03-09 20:30 ` Patchwork
2020-03-16 10:03 ` [Intel-gfx] [PATCH] " Daniel Vetter
2 siblings, 0 replies; 4+ messages in thread
From: Patchwork @ 2020-03-09 20:30 UTC (permalink / raw)
To: Chris Wilson; +Cc: intel-gfx
== Series Details ==
Series: drm: Mark up racy check of drm_gem_object.handle_count
URL : https://patchwork.freedesktop.org/series/74450/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_8097_full -> Patchwork_16880_full
====================================================
Summary
-------
**SUCCESS**
No regressions found.
External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_16880/index.html
Changes
-------
No changes found
Participating hosts (10 -> 8)
------------------------------
Missing (2): pig-skl-6260u pig-glk-j5005
Build changes
-------------
* CI: CI-20190529 -> None
* Linux: CI_DRM_8097 -> Patchwork_16880
* Piglit: piglit_4509 -> None
CI-20190529: 20190529
CI_DRM_8097: 2e46e269a2843c5d0b6c72bfb7fa9d9913c15415 @ git://anongit.freedesktop.org/gfx-ci/linux
IGT_5499: 2e23cf6f63fc6ba1d9543f8327698d6f21813cec @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
Patchwork_16880: c782f13d5ca005769575d4fc7985995da66a0f6c @ git://anongit.freedesktop.org/gfx-ci/linux
piglit_4509: fdc5a4ca11124ab8413c7988896eec4c97336694 @ git://anongit.freedesktop.org/piglit
== Logs ==
For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_16880/index.html
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Intel-gfx] [PATCH] drm: Mark up racy check of drm_gem_object.handle_count
2020-03-09 12:01 [Intel-gfx] [PATCH] drm: Mark up racy check of drm_gem_object.handle_count Chris Wilson
2020-03-09 14:03 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
2020-03-09 20:30 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
@ 2020-03-16 10:03 ` Daniel Vetter
2 siblings, 0 replies; 4+ messages in thread
From: Daniel Vetter @ 2020-03-16 10:03 UTC (permalink / raw)
To: Chris Wilson; +Cc: intel-gfx, dri-devel
On Mon, Mar 09, 2020 at 12:01:51PM +0000, Chris Wilson wrote:
> [ 1715.899800] BUG: KCSAN: data-race in drm_gem_handle_create_tail / drm_gem_object_handle_put_unlocked
> [ 1715.899838]
> [ 1715.899861] write to 0xffff8881830f3604 of 4 bytes by task 7834 on cpu 1:
> [ 1715.899896] drm_gem_handle_create_tail+0x62/0x250
> [ 1715.899927] drm_gem_open_ioctl+0xc1/0x160
> [ 1715.899956] drm_ioctl_kernel+0xe4/0x120
> [ 1715.899981] drm_ioctl+0x297/0x4c7
> [ 1715.900003] ksys_ioctl+0x89/0xb0
> [ 1715.900027] __x64_sys_ioctl+0x42/0x60
> [ 1715.900052] do_syscall_64+0x6e/0x2c0
> [ 1715.900079] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 1715.900100]
> [ 1715.900119] read to 0xffff8881830f3604 of 4 bytes by task 8137 on cpu 0:
> [ 1715.900149] drm_gem_object_handle_put_unlocked+0x31/0x130
> [ 1715.900180] drm_gem_object_release_handle+0x93/0xe0
> [ 1715.900208] drm_gem_handle_delete+0x7b/0xe0
> [ 1715.900235] drm_gem_close_ioctl+0x61/0x80
> [ 1715.900264] drm_ioctl_kernel+0xe4/0x120
> [ 1715.900291] drm_ioctl+0x297/0x4c7
> [ 1715.900316] ksys_ioctl+0x89/0xb0
> [ 1715.900340] __x64_sys_ioctl+0x42/0x60
> [ 1715.900363] do_syscall_64+0x6e/0x2c0
> [ 1715.900388] entry_SYSCALL_64_after_hwframe+0x44/0xa9
I'm impressed. The dream that we all get replaced by some scripts might be
real :-)
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
> drivers/gpu/drm/drm_gem.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index a9e4a610445a..37627d06fb06 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -218,7 +218,7 @@ drm_gem_object_handle_put_unlocked(struct drm_gem_object *obj)
> struct drm_device *dev = obj->dev;
> bool final = false;
>
> - if (WARN_ON(obj->handle_count == 0))
> + if (WARN_ON(READ_ONCE(obj->handle_count) == 0))
> return;
>
> /*
> --
> 2.20.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 4+ messages in thread
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Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2020-03-09 12:01 [Intel-gfx] [PATCH] drm: Mark up racy check of drm_gem_object.handle_count Chris Wilson
2020-03-09 14:03 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
2020-03-09 20:30 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2020-03-16 10:03 ` [Intel-gfx] [PATCH] " Daniel Vetter
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