The removed line prevents the following cleanup function
to execute a dma_fence_put on the out_fence to free its
memory, producing the following output in kmemleak:
unreferenced object 0xffff888126d8ee00 (size 128):
comm "kwin_wayland", pid 981, jiffies 4295380296 (age 390.060s)
hex dump (first 32 bytes):
c8 a1 c2 27 81 88 ff ff e0 14 a9 c0 ff ff ff ff ...'............
30 1a e1 2e a6 00 00 00 28 fc 5b 17 81 88 ff ff 0.......(.[.....
backtrace:
[<0000000011655661>] kmalloc_trace+0x26/0xa0
[<0000000055f15b82>] virtio_gpu_fence_alloc+0x47/0xc0 [virtio_gpu]
[<00000000fa6d96f9>] virtio_gpu_execbuffer_ioctl+0x1a8/0x800 [virtio_gpu]
[<00000000e6cb5105>] drm_ioctl_kernel+0x169/0x240 [drm]
[<000000005ad33e27>] drm_ioctl+0x399/0x6b0 [drm]
[<00000000a19dbf65>] __x64_sys_ioctl+0xc5/0x100
[<0000000011fa801e>] do_syscall_64+0x5b/0xc0
[<0000000065c76d8a>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
unreferenced object 0xffff888121930500 (size 128):
comm "kwin_wayland", pid 981, jiffies 4295380313 (age 390.096s)
hex dump (first 32 bytes):
c8 a1 c2 27 81 88 ff ff e0 14 a9 c0 ff ff ff ff ...'............
f9 ec d7 2f a6 00 00 00 28 fc 5b 17 81 88 ff ff .../....(.[.....
backtrace:
[<0000000011655661>] kmalloc_trace+0x26/0xa0
[<0000000055f15b82>] virtio_gpu_fence_alloc+0x47/0xc0 [virtio_gpu]
[<00000000fa6d96f9>] virtio_gpu_execbuffer_ioctl+0x1a8/0x800 [virtio_gpu]
[<00000000e6cb5105>] drm_ioctl_kernel+0x169/0x240 [drm]
[<000000005ad33e27>] drm_ioctl+0x399/0x6b0 [drm]
[<00000000a19dbf65>] __x64_sys_ioctl+0xc5/0x100
[<0000000011fa801e>] do_syscall_64+0x5b/0xc0
[<0000000065c76d8a>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
[...]
This memleak will grow quickly, being possible to see the
following line in dmesg after few minutes of life in the
virtual machine:
[ 706.217388] kmemleak: 10731 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
The patch will remove the line to allow the cleanup
function do its job.
Signed-off-by: José Pekkarinen <[email protected]>
---
drivers/gpu/drm/virtio/virtgpu_submit.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_submit.c b/drivers/gpu/drm/virtio/virtgpu_submit.c
index 3c00135ead45..5c514946bbad 100644
--- a/drivers/gpu/drm/virtio/virtgpu_submit.c
+++ b/drivers/gpu/drm/virtio/virtgpu_submit.c
@@ -361,7 +361,6 @@ static void virtio_gpu_complete_submit(struct virtio_gpu_submit *submit)
submit->buf = NULL;
submit->buflist = NULL;
submit->sync_file = NULL;
- submit->out_fence = NULL;
submit->out_fence_fd = -1;
}
--
2.39.2
On 2023-09-12 09:08, José Pekkarinen wrote:
> The removed line prevents the following cleanup function
> to execute a dma_fence_put on the out_fence to free its
> memory, producing the following output in kmemleak:
>
> unreferenced object 0xffff888126d8ee00 (size 128):
> comm "kwin_wayland", pid 981, jiffies 4295380296 (age 390.060s)
> hex dump (first 32 bytes):
> c8 a1 c2 27 81 88 ff ff e0 14 a9 c0 ff ff ff ff ...'............
> 30 1a e1 2e a6 00 00 00 28 fc 5b 17 81 88 ff ff 0.......(.[.....
> backtrace:
> [<0000000011655661>] kmalloc_trace+0x26/0xa0
> [<0000000055f15b82>] virtio_gpu_fence_alloc+0x47/0xc0 [virtio_gpu]
> [<00000000fa6d96f9>] virtio_gpu_execbuffer_ioctl+0x1a8/0x800
> [virtio_gpu]
> [<00000000e6cb5105>] drm_ioctl_kernel+0x169/0x240 [drm]
> [<000000005ad33e27>] drm_ioctl+0x399/0x6b0 [drm]
> [<00000000a19dbf65>] __x64_sys_ioctl+0xc5/0x100
> [<0000000011fa801e>] do_syscall_64+0x5b/0xc0
> [<0000000065c76d8a>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
> unreferenced object 0xffff888121930500 (size 128):
> comm "kwin_wayland", pid 981, jiffies 4295380313 (age 390.096s)
> hex dump (first 32 bytes):
> c8 a1 c2 27 81 88 ff ff e0 14 a9 c0 ff ff ff ff ...'............
> f9 ec d7 2f a6 00 00 00 28 fc 5b 17 81 88 ff ff .../....(.[.....
> backtrace:
> [<0000000011655661>] kmalloc_trace+0x26/0xa0
> [<0000000055f15b82>] virtio_gpu_fence_alloc+0x47/0xc0 [virtio_gpu]
> [<00000000fa6d96f9>] virtio_gpu_execbuffer_ioctl+0x1a8/0x800
> [virtio_gpu]
> [<00000000e6cb5105>] drm_ioctl_kernel+0x169/0x240 [drm]
> [<000000005ad33e27>] drm_ioctl+0x399/0x6b0 [drm]
> [<00000000a19dbf65>] __x64_sys_ioctl+0xc5/0x100
> [<0000000011fa801e>] do_syscall_64+0x5b/0xc0
> [<0000000065c76d8a>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
> [...]
>
> This memleak will grow quickly, being possible to see the
> following line in dmesg after few minutes of life in the
> virtual machine:
>
> [ 706.217388] kmemleak: 10731 new suspected memory leaks (see
> /sys/kernel/debug/kmemleak)
>
> The patch will remove the line to allow the cleanup
> function do its job.
>
> Signed-off-by: José Pekkarinen <[email protected]>
> ---
> drivers/gpu/drm/virtio/virtgpu_submit.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_submit.c
> b/drivers/gpu/drm/virtio/virtgpu_submit.c
> index 3c00135ead45..5c514946bbad 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_submit.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_submit.c
> @@ -361,7 +361,6 @@ static void virtio_gpu_complete_submit(struct
> virtio_gpu_submit *submit)
> submit->buf = NULL;
> submit->buflist = NULL;
> submit->sync_file = NULL;
> - submit->out_fence = NULL;
> submit->out_fence_fd = -1;
> }
Ping.
José.
On 9/12/23 09:08, José Pekkarinen wrote:
> The removed line prevents the following cleanup function
> to execute a dma_fence_put on the out_fence to free its
> memory, producing the following output in kmemleak:
>
> unreferenced object 0xffff888126d8ee00 (size 128):
> comm "kwin_wayland", pid 981, jiffies 4295380296 (age 390.060s)
> hex dump (first 32 bytes):
> c8 a1 c2 27 81 88 ff ff e0 14 a9 c0 ff ff ff ff ...'............
> 30 1a e1 2e a6 00 00 00 28 fc 5b 17 81 88 ff ff 0.......(.[.....
> backtrace:
> [<0000000011655661>] kmalloc_trace+0x26/0xa0
> [<0000000055f15b82>] virtio_gpu_fence_alloc+0x47/0xc0 [virtio_gpu]
> [<00000000fa6d96f9>] virtio_gpu_execbuffer_ioctl+0x1a8/0x800 [virtio_gpu]
> [<00000000e6cb5105>] drm_ioctl_kernel+0x169/0x240 [drm]
> [<000000005ad33e27>] drm_ioctl+0x399/0x6b0 [drm]
> [<00000000a19dbf65>] __x64_sys_ioctl+0xc5/0x100
> [<0000000011fa801e>] do_syscall_64+0x5b/0xc0
> [<0000000065c76d8a>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
> unreferenced object 0xffff888121930500 (size 128):
> comm "kwin_wayland", pid 981, jiffies 4295380313 (age 390.096s)
> hex dump (first 32 bytes):
> c8 a1 c2 27 81 88 ff ff e0 14 a9 c0 ff ff ff ff ...'............
> f9 ec d7 2f a6 00 00 00 28 fc 5b 17 81 88 ff ff .../....(.[.....
> backtrace:
> [<0000000011655661>] kmalloc_trace+0x26/0xa0
> [<0000000055f15b82>] virtio_gpu_fence_alloc+0x47/0xc0 [virtio_gpu]
> [<00000000fa6d96f9>] virtio_gpu_execbuffer_ioctl+0x1a8/0x800 [virtio_gpu]
> [<00000000e6cb5105>] drm_ioctl_kernel+0x169/0x240 [drm]
> [<000000005ad33e27>] drm_ioctl+0x399/0x6b0 [drm]
> [<00000000a19dbf65>] __x64_sys_ioctl+0xc5/0x100
> [<0000000011fa801e>] do_syscall_64+0x5b/0xc0
> [<0000000065c76d8a>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
> [...]
>
> This memleak will grow quickly, being possible to see the
> following line in dmesg after few minutes of life in the
> virtual machine:
>
> [ 706.217388] kmemleak: 10731 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
>
> The patch will remove the line to allow the cleanup
> function do its job.
>
> Signed-off-by: José Pekkarinen <[email protected]>
> ---
> drivers/gpu/drm/virtio/virtgpu_submit.c | 1 -
> 1 file changed, 1 deletion(-)
Added fixes tag and pushed to misc-fixes
--
Best regards,
Dmitry