[Bug 98571] New: [i915] might_sleep() called from wrong context with GuC submission enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98571

            Bug ID: 98571
           Summary: [i915] might_sleep() called from wrong context with
                    GuC submission enabled
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: arkadiusz.hiler at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On 03 Nov 2016 drm-intel-nightly,
with i915.enable_guc_loading=1 i915.enable_guc_submission=1

Every couple dozens of seconds I get the following error:

[  711.256431] BUG: sleeping function called from invalid context at
drivers/gpu/drm/i915/i915_gem.c:4991
[  711.256446] in_atomic(): 1, irqs_disabled(): 1, pid: 1041, name: compiz
[  711.256453] INFO: lockdep is turned off.
[  711.256459] irq event stamp: 0
[  711.256466] hardirqs last  enabled at (0): [  711.256472] [<         
(null)>]           (null)
[  711.256478] hardirqs last disabled at (0): [  711.256487]
[<ffffffff81097cbd>] copy_process.part.6+0x2cd/0x1fd0
[  711.256493] softirqs last  enabled at (0): [  711.256500]
[<ffffffff81097cbd>] copy_process.part.6+0x2cd/0x1fd0
[  711.256506] softirqs last disabled at (0): [  711.256512] [<         
(null)>]           (null)
[  711.256525] Preemption disabled at:[  711.256557] [<ffffffffa0082961>]
__i915_add_request+0x181/0x3e0 [i915]
[  711.256568] CPU: 1 PID: 1041 Comm: compiz Tainted: G     U  W      
4.9.0-rc3nightly-031116+ #15
[  711.256574] Hardware name:                  /NUC6i5SYB, BIOS
SYSKLi35.86A.0042.2016.0409.1246 04/09/2016
[  711.256581]  ffffc9000634b9a8 ffffffff8147f453 0000000000000000
ffff88082b5a8040
[  711.256614]  ffffc9000634b9e0 ffffffff810c7e94 ffffffffa0150c30
000000000000137f
[  711.256640]  0000000000000000 ffff8808413a8000 ffff880844c93400
ffffc9000634ba08
[  711.256669] Call Trace:
[  711.256684]  [<ffffffff8147f453>] dump_stack+0x86/0xc3
[  711.256691]  [<ffffffff810c7e94>] ___might_sleep+0x174/0x260
[  711.256699]  [<ffffffff810c7fca>] __might_sleep+0x4a/0x80
[  711.256733]  [<ffffffffa007f6e9>] i915_gem_object_get_sg+0x39/0x380 [i915]
[  711.256767]  [<ffffffffa00a0ace>] ? i915_guc_submit+0x3e/0x360 [i915]
[  711.256798]  [<ffffffffa0080292>] i915_gem_object_get_page+0x22/0x60 [i915]
[  711.256829]  [<ffffffffa00a0b71>] i915_guc_submit+0xe1/0x360 [i915]
[  711.256859]  [<ffffffffa0081ee1>] submit_notify+0xfd/0x17c [i915]
[  711.256885]  [<ffffffffa004365a>] __i915_sw_fence_complete+0xda/0x190 [i915]
[  711.256906]  [<ffffffffa0043727>] i915_sw_fence_complete+0x17/0x30 [i915]
[  711.256924]  [<ffffffffa0043aa2>] i915_sw_fence_commit+0x12/0x20 [i915]
[  711.256948]  [<ffffffffa008296d>] __i915_add_request+0x18d/0x3e0 [i915]
[  711.256975]  [<ffffffffa006b37f>]
i915_gem_do_execbuffer.isra.15+0xb5f/0x1a00 [i915]
[  711.256985]  [<ffffffff81865c0e>] ? mutex_unlock+0xe/0x10
[  711.256994]  [<ffffffff811dc753>] ? __might_fault+0x43/0xa0
[  711.257025]  [<ffffffffa006c602>] i915_gem_execbuffer2+0xc2/0x250 [i915]
[  711.257035]  [<ffffffff815c9c13>] drm_ioctl+0x203/0x4a0
[  711.257059]  [<ffffffffa006c540>] ? i915_gem_execbuffer+0x320/0x320 [i915]
[  711.257070]  [<ffffffff812498c5>] ? __fget+0x5/0x200
[  711.257079]  [<ffffffff8123c584>] do_vfs_ioctl+0x94/0x6b0
[  711.257086]  [<ffffffff812499cd>] ? __fget+0x10d/0x200
[  711.257093]  [<ffffffff812498c5>] ? __fget+0x5/0x200
[  711.257101]  [<ffffffff8123cbe1>] SyS_ioctl+0x41/0x70
[  711.257110]  [<ffffffff8186a205>] entry_SYSCALL_64_fastpath+0x23/0xc6

Introduced by: 
"drm/i915: Use a radixtree for random access to the object's backing storage"

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