[Intel-gfx] Possible regression in drm/i915 driver: memleak

[srinivas pandruvada]

+Added DRM mailing list and maintainers

On Tue, 2022-12-20 at 15:33 +0100, Mirsad Todorovac wrote:
> Hi all,
> 
> I have been unsuccessful to find any particular Intel i915 maintainer
> emails, so my best bet is to post here, as you will must assuredly 
> already know them.
> 
> The problem is a kernel memory leak that is repeatedly occurring 
> triggered during the execution of Chrome browser under the latest
> 6.1.0+ 
> kernel of this morning and Almalinux 8.6 on a Lenovo desktop box
> with Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz CPU.
> 
> The build is with KMEMLEAK, KASAN and MGLRU turned on during the
> build, 
> on a vanilla mainline kernel from Mr. Torvalds' tree.
> 
> The leaks look like this one:
> 
> unreferenced object 0xffff888131754880 (size 64):
>    comm "chrome", pid 13058, jiffies 4298568878 (age 3708.084s)
>    hex dump (first 32 bytes):
>      01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> ................
>      00 00 00 00 00 00 00 00 00 80 1e 3e 83 88 ff ff 
> ...........>....
>    backtrace:
>      [<ffffffff9e9b5542>] slab_post_alloc_hook+0xb2/0x340
>      [<ffffffff9e9bbf5f>] __kmem_cache_alloc_node+0x1bf/0x2c0
>      [<ffffffff9e8f767a>] kmalloc_trace+0x2a/0xb0
>      [<ffffffffc08dfde5>] drm_vma_node_allow+0x45/0x150 [drm]
>      [<ffffffffc0b33315>] __assign_mmap_offset_handle+0x615/0x820
> [i915]
>      [<ffffffffc0b34057>] i915_gem_mmap_offset_ioctl+0x77/0x110
> [i915]
>      [<ffffffffc08bc5e1>] drm_ioctl_kernel+0x181/0x280 [drm]
>      [<ffffffffc08bc9cd>] drm_ioctl+0x2dd/0x6a0 [drm]
>      [<ffffffff9ea54744>] __x64_sys_ioctl+0xc4/0x100
>      [<ffffffff9fbc0178>] do_syscall_64+0x58/0x80
>      [<ffffffff9fc000aa>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> 
> The complete list of leaks in attachment, but they seem similar or
> the same.
> 
> Please find attached lshw and kernel build config file.
> 
> I will probably check the same parms on my laptop at home, which is
> also 
> Lenovo, but a different hw config and Ubuntu 22.10.
> 
> Thanks,
> Mirsad
> 
> -- 
> Mirsad Goran Todorovac
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