[Bug 83794] New: [i915 driver] suspend/resume leaks memory

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83794

          Priority: medium
            Bug ID: 83794
          Assignee: chris at chris-wilson.co.uk
           Summary: [i915 driver] suspend/resume leaks memory
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: kari.tj.suvanto at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 106171
  --> https://bugs.freedesktop.org/attachment.cgi?id=106171&action=edit
output of cat /sys/kernel/debug/kmemleak

I noticed this when debugging suspend/resume problem with ubuntu 14.04 +
3.17rc4 (or latest next) kernel compiled. The suspend/resume problem i have is
not i915 related.

steps to reproduce: 
1. compile kernel with CONFIG_DEBUG_KMEMLEAK and CONFIG_PM_DEBUG
2. Run: echo clear > /sys/kernel/debug/kmemleak
3. Run: echo core > /sys/power/pm_test
4. Run: echo mem > /sys/power/state
5. Run: echo scan > /sys/kernel/debug/kmemleak
6. Run: cat /sys/kernel/debug/kmemleak
7. check output. 


a lot of entries like this occurs:
unreferenced object 0xffff880405960980 (size 32):
  comm "systemd-udevd", pid 516, jiffies 4294896961 (age 10202.044s)
  hex dump (first 32 bytes):
    d0 85 46 c0 ff ff ff ff 00 00 00 00 00 00 00 00  ..F.............
    98 60 28 04 04 88 ff ff 00 00 00 00 00 00 00 00  .`(.............
  backtrace:
    [<ffffffff81816f9e>] kmemleak_alloc+0x4e/0xb0
    [<ffffffff811fa678>] kmem_cache_alloc_trace+0x168/0x2f0
    [<ffffffffc03e20a5>] i915_cmd_parser_init_ring+0x2a5/0x3e0 [i915]
    [<ffffffffc04088a2>] intel_init_ring_buffer+0x202/0x470 [i915]
    [<ffffffffc040c998>] intel_init_vebox_ring_buffer+0x1e8/0x2b0 [i915]
    [<ffffffffc03eff59>] i915_gem_init_hw+0x2f9/0x3a0 [i915]
    [<ffffffffc03f0057>] i915_gem_init+0x57/0x1d0 [i915]
    [<ffffffffc045e26a>] i915_driver_load+0xc0a/0x10e0 [i915]
    [<ffffffffc02e0d5d>] drm_dev_register+0xad/0x100 [drm]
    [<ffffffffc02e3b9f>] drm_get_pci_dev+0x8f/0x200 [drm]
    [<ffffffffc03c934b>] i915_pci_probe+0x3b/0x60 [i915]
    [<ffffffff81436725>] local_pci_probe+0x45/0xa0
    [<ffffffff81437a69>] pci_device_probe+0xd9/0x130
    [<ffffffff81524f4d>] driver_probe_device+0x12d/0x3e0
    [<ffffffff815252d3>] __driver_attach+0x93/0xa0
    [<ffffffff81522e1b>] bus_for_each_dev+0x6b/0xb0


usually the allocating function is i915_cmd_parser_init_ring but the rest of
the stack might be different. 


Im not familiar with this driver at all but I think ring buffer should be
deleted/cleaned from suspend but now it is only stopping ring buffer? This leak
seems to be cumulative so every resume allocates that again but suspend does
not release it.

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