[Bug 93815] New: i915 resume weirdness/OOM OOPSing, but only when built-into kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93815

            Bug ID: 93815
           Summary: i915 resume weirdness/OOM OOPSing, but only when
                    built-into kernel
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: kenny at panix.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

If I compile the i915 DRM driver into the kernel
directly, I get OOM (et al). crashes upon resuming from suspend. Made as a
module and loaded post-init (at first boot), no problems at all.

Because I'm running X at the time I suspend (and I'm using the vanilla kernel's
"swsusp"), the i915 module can't even be removed at the time of suspend, so
(wild-assed guess coming) there's "something" in the module-initialization
code (or throw-away upon init() pages?) that prevents the following from
happening (and I don't know from GPUs, but I'll bet that first line is the
smoking gun here):

----
[  844.911705] Purging GPU memory, 130011136 bytes freed, 19116032 bytes still
pinned.
[  844.911988] ibus-ui-gtk3 invoked oom-killer: gfp_mask=0x0, order=0,
oom_score_adj=0
[  844.911991] CPU: 4 PID: 2814 Comm: ibus-ui-gtk3 Tainted: G           O   
4.4.0-Kenny-EFI+ #5
[  844.911992] Hardware name: TOSHIBA Satellite P75-A/Type2 - Board Product
Name1, BIOS 1.60 12/04/2014
[  844.911993]  ffff880441df7e98 ffff880441df7d50 ffffffff814275b2
0000000000000000
[  844.911995]  ffff880441df7dd8 ffffffff81173ad9 0000000000000000
ffff880441df7db0
[  844.911997]  ffffffff81554d86 0000000000000000 01ff880441df7da0
00000000ffffffff
[  844.911998] Call Trace:
[  844.912003]  [<ffffffff814275b2>] dump_stack+0x4b/0x79
[  844.912007]  [<ffffffff81173ad9>] dump_header.isra.9+0x4c/0x1c9
[  844.912010]  [<ffffffff81554d86>] ? i915_gem_shrinker_oom+0x186/0x1f0
[  844.912012]  [<ffffffff811276d1>] oom_kill_process+0x201/0x3f0
[  844.912014]  [<ffffffff81127bbb>] out_of_memory+0x29b/0x2f0
[  844.912015]  [<ffffffff81127c55>] pagefault_out_of_memory+0x45/0x90
[  844.912018]  [<ffffffff81094467>] mm_fault_error+0x59/0x101
[  844.912020]  [<ffffffff810381fd>] __do_page_fault+0x2bd/0x360
[  844.912022]  [<ffffffff810382dc>] do_page_fault+0xc/0x10
[  844.912025]  [<ffffffff81943bd2>] page_fault+0x22/0x30

(I'd E-mailed Daniel and Jani the output of "dmesg" which I no longer have;
I've asked them to add it to this bug report if they've still got it).

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