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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI] igt@drv_selftest@live_context - dmesg-warn - WARNING: possible circular locking dependency detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103730">103730</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[CI] igt@drv_selftest@live_context - dmesg-warn - WARNING: possible circular locking dependency detected
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>marta.lofstedt@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre><a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3342/shard-snb5/igt@drv_selftest@live_contexts.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3342/shard-snb5/igt@drv_selftest@live_contexts.html</a>
[ 1366.741276] ======================================================
[ 1366.741277] WARNING: possible circular locking dependency detected
[ 1366.741278] 4.14.0-rc8-CI-CI_DRM_3342+ #1 Tainted: G U
[ 1366.741279] ------------------------------------------------------
[ 1366.741280] drv_selftest/18398 is trying to acquire lock:
[ 1366.741280] (&dev->object_name_lock){+.+.}, at: [<ffffffff815f26a9>]
drm_gem_handle_create+0x29/0x40
[ 1366.741285]
but task is already holding lock:
[ 1366.741286] (&dev->struct_mutex){+.+.}, at: [<ffffffffa0347259>]
igt_ctx_exec+0x69/0xd50 [i915]
[ 1366.741331]
which lock already depends on the new lock.
[ 1366.741332]
the existing dependency chain (in reverse order) is:
[ 1366.741333]
-> #2 (&dev->struct_mutex){+.+.}:
[ 1366.741337] lock_acquire+0xb0/0x200
[ 1366.741341] __mutex_lock+0x86/0x9b0
[ 1366.741343] mutex_lock_interruptible_nested+0x1b/0x20
[ 1366.741344] 0xffffffffa0182131
[ 1366.741345] 0xffffffffa0187d2b
[ 1366.741348] __do_fault+0x1e/0x80
[ 1366.741350] __handle_mm_fault+0xa08/0xed0
[ 1366.741352] handle_mm_fault+0x156/0x300
[ 1366.741354] __do_page_fault+0x2d2/0x560
[ 1366.741355] do_page_fault+0x28/0x250
[ 1366.741357] page_fault+0x22/0x30
[ 1366.741358]
-> #1 (&mm->mmap_sem){++++}:
[ 1366.741362] lock_acquire+0xb0/0x200
[ 1366.741364] down_write+0x3b/0x70
[ 1366.741364] 0xffffffffa019a1ea
[ 1366.741365] 0xffffffffa019a3bd
[ 1366.741366] 0xffffffffa016bd3e
[ 1366.741368] drm_gem_prime_handle_to_fd+0x18e/0x1c0
[ 1366.741370] drm_prime_handle_to_fd_ioctl+0x44/0x60
[ 1366.741371] drm_ioctl_kernel+0x69/0xb0
[ 1366.741372] drm_ioctl+0x2f9/0x3d0
[ 1366.741375] do_vfs_ioctl+0x94/0x670
[ 1366.741376] SyS_ioctl+0x41/0x70
[ 1366.741379] entry_SYSCALL_64_fastpath+0x1c/0xb1
[ 1366.741379]
-> #0 (&dev->object_name_lock){+.+.}:
[ 1366.741383] __lock_acquire+0x1962/0x1b00
[ 1366.741384] lock_acquire+0xb0/0x200
[ 1366.741386] __mutex_lock+0x86/0x9b0
[ 1366.741388] mutex_lock_nested+0x1b/0x20
[ 1366.741389] drm_gem_handle_create+0x29/0x40
[ 1366.741431] igt_ctx_exec+0x540/0xd50 [i915]
[ 1366.741480] __i915_subtests+0x40/0xd0 [i915]
[ 1366.741523] i915_gem_context_live_selftests+0x48/0x140 [i915]
[ 1366.741571] __run_selftests+0x121/0x1c0 [i915]
[ 1366.741617] i915_live_selftests+0x35/0x60 [i915]
[ 1366.741657] i915_pci_probe+0x4a/0x90 [i915]
[ 1366.741661] pci_device_probe+0xa8/0x130
[ 1366.741664] driver_probe_device+0x29c/0x450
[ 1366.741666] __driver_attach+0xe3/0xf0
[ 1366.741668] bus_for_each_dev+0x62/0xa0
[ 1366.741669] driver_attach+0x1e/0x20
[ 1366.741671] bus_add_driver+0x173/0x270
[ 1366.741673] driver_register+0x60/0xe0
[ 1366.741674] __pci_register_driver+0x6b/0x70
[ 1366.741714] i915_init+0x6f/0x78 [i915]
[ 1366.741720] do_one_initcall+0x43/0x170
[ 1366.741723] do_init_module+0x5f/0x206
[ 1366.741734] load_module+0x2581/0x2dd0
[ 1366.741736] SyS_finit_module+0xc1/0x100
[ 1366.741738] entry_SYSCALL_64_fastpath+0x1c/0xb1
[ 1366.741740]
other info that might help us debug this:
[ 1366.741741] Chain exists of:
&dev->object_name_lock --> &mm->mmap_sem -->
&dev->struct_mutex
[ 1366.741749] Possible unsafe locking scenario:
[ 1366.741750] CPU0 CPU1
[ 1366.741753] ---- ----
[ 1366.741754] lock(&dev->struct_mutex);
[ 1366.741760] lock(&mm->mmap_sem);
[ 1366.741764] lock(&dev->struct_mutex);
[ 1366.741768] lock(&dev->object_name_lock);
[ 1366.741772]
*** DEADLOCK ***
[ 1366.741773] 3 locks held by drv_selftest/18398:
[ 1366.741774] #0: (&dev->mutex){....}, at: [<ffffffff81622adf>]
__driver_attach+0x5f/0xf0
[ 1366.741783] #1: (&dev->mutex){....}, at: [<ffffffff81622aed>]
__driver_attach+0x6d/0xf0
[ 1366.741791] #2: (&dev->struct_mutex){+.+.}, at: [<ffffffffa0347259>]
igt_ctx_exec+0x69/0xd50 [i915]
[ 1366.741836]
stack backtrace:
[ 1366.741838] CPU: 5 PID: 18398 Comm: drv_selftest Tainted: G U
4.14.0-rc8-CI-CI_DRM_3342+ #1
[ 1366.741840] Hardware name: Dell Inc. XPS 8300 /0Y2MRG, BIOS A06 10/17/2011
[ 1366.741841] Call Trace:
[ 1366.741845] dump_stack+0x68/0x9f
[ 1366.741849] print_circular_bug.isra.18+0x1f6/0x2e0
[ 1366.741851] __lock_acquire+0x1962/0x1b00
[ 1366.741855] lock_acquire+0xb0/0x200
[ 1366.741858] ? lock_acquire+0xb0/0x200
[ 1366.741860] ? drm_gem_handle_create+0x29/0x40
[ 1366.741864] __mutex_lock+0x86/0x9b0
[ 1366.741865] ? drm_gem_handle_create+0x29/0x40
[ 1366.741867] ? drm_gem_handle_create+0x29/0x40
[ 1366.741907] ? i915_gem_object_init+0x185/0x190 [i915]
[ 1366.741912] mutex_lock_nested+0x1b/0x20
[ 1366.741914] ? mutex_lock_nested+0x1b/0x20
[ 1366.741917] drm_gem_handle_create+0x29/0x40
[ 1366.741952] igt_ctx_exec+0x540/0xd50 [i915]
[ 1366.741996] __i915_subtests+0x40/0xd0 [i915]
[ 1366.742036] i915_gem_context_live_selftests+0x48/0x140 [i915]
[ 1366.742079] __run_selftests+0x121/0x1c0 [i915]
[ 1366.742118] i915_live_selftests+0x35/0x60 [i915]
[ 1366.742154] i915_pci_probe+0x4a/0x90 [i915]
[ 1366.742158] pci_device_probe+0xa8/0x130
[ 1366.742161] driver_probe_device+0x29c/0x450
[ 1366.742163] __driver_attach+0xe3/0xf0
[ 1366.742166] ? driver_probe_device+0x450/0x450
[ 1366.742168] bus_for_each_dev+0x62/0xa0
[ 1366.742172] driver_attach+0x1e/0x20
[ 1366.742175] bus_add_driver+0x173/0x270
[ 1366.742178] driver_register+0x60/0xe0
[ 1366.742180] __pci_register_driver+0x6b/0x70
[ 1366.742217] i915_init+0x6f/0x78 [i915]
[ 1366.742221] ? 0xffffffffa04d7000
[ 1366.742223] do_one_initcall+0x43/0x170
[ 1366.742227] ? rcu_read_lock_sched_held+0x7a/0x90
[ 1366.742230] ? kmem_cache_alloc_trace+0x270/0x2d0
[ 1366.742232] do_init_module+0x5f/0x206
[ 1366.742235] load_module+0x2581/0x2dd0
[ 1366.742237] ? show_coresize+0x30/0x30
[ 1366.742240] ? kernel_read+0x31/0x50
[ 1366.742244] SyS_finit_module+0xc1/0x100
[ 1366.742246] ? SyS_finit_module+0xc1/0x100
[ 1366.742249] entry_SYSCALL_64_fastpath+0x1c/0xb1
[ 1366.742251] RIP: 0033:0x7f84dec3f9f9
[ 1366.742253] RSP: 002b:00007fff83c29e28 EFLAGS: 00000246 ORIG_RAX:
0000000000000139
[ 1366.742257] RAX: ffffffffffffffda RBX: ffffffff81492083 RCX:
00007f84dec3f9f9
[ 1366.742259] RDX: 0000000000000000 RSI: 000055c7c16ca030 RDI:
0000000000000006
[ 1366.742260] RBP: ffffc900005d7f88 R08: 0000000000000000 R09:
0000000000000000
[ 1366.742262] R10: 0000000000000006 R11: 0000000000000246 R12:
0000000000000000
[ 1366.742264] R13: 000055c7c16cefe0 R14: 0000000000000000 R15:
000055c7c16c6990
[ 1366.742267] ? __this_cpu_preempt_check+0x13/0x20
[ 1367.828840] to colour frame buffer device 128x48
[ 1368.115825] i915: probe of 0000:00:02.0 failed with error -25
[ 1368.285804] to colour frame buffer device 128x48</pre>
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