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<b><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#c2">Comment # 2</a>
on <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">bug 103730</a>
from <span class="vcard"><a class="email" href="mailto:marta.lofstedt@intel.com" title="Marta Löfstedt <marta.lofstedt@intel.com>"> <span class="fn">Marta Löfstedt</span></a>
</span></b>
<pre><a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3347/shard-hsw5/igt@drv_selftest@live_contexts.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3347/shard-hsw5/igt@drv_selftest@live_contexts.html</a>
<4>[ 1203.737243] ======================================================
<4>[ 1203.737244] WARNING: possible circular locking dependency detected
<4>[ 1203.737245] 4.14.0-CI-CI_DRM_3347+ #1 Tainted: G U
<4>[ 1203.737245] ------------------------------------------------------
<4>[ 1203.737246] drv_selftest/21936 is trying to acquire lock:
<4>[ 1203.737246] (&dev->object_name_lock){+.+.}, at: [<ffffffff815f44b9>]
drm_gem_handle_create+0x29/0x40
<4>[ 1203.737249]
but task is already holding lock:
<4>[ 1203.737249] (&dev->struct_mutex){+.+.}, at: [<ffffffffa0352276>]
igt_ctx_exec+0x76/0xd20 [i915]
<4>[ 1203.737270]
which lock already depends on the new lock.
<4>[ 1203.737271]
the existing dependency chain (in reverse order) is:
<4>[ 1203.737271]
-> #2 (&dev->struct_mutex){+.+.}:
<4>[ 1203.737273] lock_acquire+0xb0/0x200
<4>[ 1203.737275] __mutex_lock+0x86/0x9b0
<4>[ 1203.737275] mutex_lock_interruptible_nested+0x1b/0x20
<4>[ 1203.737276] 0xffffffffa01be1b1
<4>[ 1203.737276] 0xffffffffa01c3e0b
<4>[ 1203.737278] __do_fault+0x1e/0x80
<4>[ 1203.737279] __handle_mm_fault+0x81f/0xed0
<4>[ 1203.737279] handle_mm_fault+0x156/0x300
<4>[ 1203.737280] __do_page_fault+0x2d2/0x560
<4>[ 1203.737281] do_page_fault+0x28/0x250
<4>[ 1203.737282] page_fault+0x22/0x30
<4>[ 1203.737282]
-> #1 (&mm->mmap_sem){++++}:
<4>[ 1203.737284] lock_acquire+0xb0/0x200
<4>[ 1203.737284] down_write+0x3b/0x70
<4>[ 1203.737285] 0xffffffffa01bd31a
<4>[ 1203.737286] 0xffffffffa01bd4ed
<4>[ 1203.737286] 0xffffffffa018ed1e
<4>[ 1203.737287] drm_gem_prime_handle_to_fd+0x18e/0x1c0
<4>[ 1203.737288] drm_prime_handle_to_fd_ioctl+0x44/0x60
<4>[ 1203.737289] drm_ioctl_kernel+0x69/0xb0
<4>[ 1203.737289] drm_ioctl+0x2f9/0x3d0
<4>[ 1203.737291] do_vfs_ioctl+0x94/0x670
<4>[ 1203.737293] SyS_ioctl+0x41/0x70
<4>[ 1203.737294] entry_SYSCALL_64_fastpath+0x1c/0xb1
<4>[ 1203.737294]
-> #0 (&dev->object_name_lock){+.+.}:
<4>[ 1203.737295] __lock_acquire+0x1962/0x1b00
<4>[ 1203.737296] lock_acquire+0xb0/0x200
<4>[ 1203.737297] __mutex_lock+0x86/0x9b0
<4>[ 1203.737297] mutex_lock_nested+0x1b/0x20
<4>[ 1203.737298] drm_gem_handle_create+0x29/0x40
<4>[ 1203.737316] igt_ctx_exec+0x54e/0xd20 [i915]
<4>[ 1203.737339] __i915_subtests+0x40/0xd0 [i915]
<4>[ 1203.737359] i915_gem_context_live_selftests+0x48/0x140 [i915]
<4>[ 1203.737382] __run_selftests+0x121/0x1c0 [i915]
<4>[ 1203.737408] i915_live_selftests+0x35/0x60 [i915]
<4>[ 1203.737433] i915_pci_probe+0x4a/0x90 [i915]
<4>[ 1203.737436] pci_device_probe+0xa8/0x130
<4>[ 1203.737438] driver_probe_device+0x29c/0x450
<4>[ 1203.737440] __driver_attach+0xe3/0xf0
<4>[ 1203.737441] bus_for_each_dev+0x62/0xa0
<4>[ 1203.737443] driver_attach+0x1e/0x20
<4>[ 1203.737444] bus_add_driver+0x173/0x270
<4>[ 1203.737446] driver_register+0x60/0xe0
<4>[ 1203.737448] __pci_register_driver+0x6b/0x70
<4>[ 1203.737474] i915_init+0x6f/0x78 [i915]
<4>[ 1203.737475] do_one_initcall+0x43/0x170
<4>[ 1203.737477] do_init_module+0x5f/0x206
<4>[ 1203.737478] load_module+0x2581/0x2dd0
<4>[ 1203.737480] SyS_finit_module+0xc1/0x100
<4>[ 1203.737481] entry_SYSCALL_64_fastpath+0x1c/0xb1
<4>[ 1203.737482]
other info that might help us debug this:
<4>[ 1203.737482] Chain exists of:
&dev->object_name_lock --> &mm->mmap_sem -->
&dev->struct_mutex
<4>[ 1203.737485] Possible unsafe locking scenario:
<4>[ 1203.737485] CPU0 CPU1
<4>[ 1203.737485] ---- ----
<4>[ 1203.737486] lock(&dev->struct_mutex);
<4>[ 1203.737487] lock(&mm->mmap_sem);
<4>[ 1203.737488] lock(&dev->struct_mutex);
<4>[ 1203.737488] lock(&dev->object_name_lock);
<4>[ 1203.737489]
*** DEADLOCK ***
<4>[ 1203.737490] 3 locks held by drv_selftest/21936:
<4>[ 1203.737490] #0: (&dev->mutex){....}, at: [<ffffffff816248ef>]
__driver_attach+0x5f/0xf0
<4>[ 1203.737493] #1: (&dev->mutex){....}, at: [<ffffffff816248fd>]
__driver_attach+0x6d/0xf0
<4>[ 1203.737496] #2: (&dev->struct_mutex){+.+.}, at: [<ffffffffa0352276>]
igt_ctx_exec+0x76/0xd20 [i915]
<4>[ 1203.737524]
stack backtrace:
<4>[ 1203.737525] CPU: 5 PID: 21936 Comm: drv_selftest Tainted: G U
4.14.0-CI-CI_DRM_3347+ #1
<4>[ 1203.737526] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12
02/15/2016
<4>[ 1203.737527] Call Trace:
<4>[ 1203.737529] dump_stack+0x68/0x9f
<4>[ 1203.737531] print_circular_bug.isra.18+0x1f6/0x2e0
<4>[ 1203.737533] __lock_acquire+0x1962/0x1b00
<4>[ 1203.737536] lock_acquire+0xb0/0x200
<4>[ 1203.737537] ? lock_acquire+0xb0/0x200
<4>[ 1203.737539] ? drm_gem_handle_create+0x29/0x40
<4>[ 1203.737540] __mutex_lock+0x86/0x9b0
<4>[ 1203.737541] ? drm_gem_handle_create+0x29/0x40
<4>[ 1203.737543] ? drm_gem_handle_create+0x29/0x40
<4>[ 1203.737570] ? i915_gem_object_init+0x185/0x190 [i915]
<4>[ 1203.737572] mutex_lock_nested+0x1b/0x20
<4>[ 1203.737573] ? mutex_lock_nested+0x1b/0x20
<4>[ 1203.737574] drm_gem_handle_create+0x29/0x40
<4>[ 1203.737599] igt_ctx_exec+0x54e/0xd20 [i915]
<4>[ 1203.737630] __i915_subtests+0x40/0xd0 [i915]
<4>[ 1203.737657] i915_gem_context_live_selftests+0x48/0x140 [i915]
<4>[ 1203.737687] __run_selftests+0x121/0x1c0 [i915]
<4>[ 1203.737713] i915_live_selftests+0x35/0x60 [i915]
<4>[ 1203.737738] i915_pci_probe+0x4a/0x90 [i915]
<4>[ 1203.737741] pci_device_probe+0xa8/0x130
<4>[ 1203.737743] driver_probe_device+0x29c/0x450
<4>[ 1203.737745] __driver_attach+0xe3/0xf0
<4>[ 1203.737746] ? driver_probe_device+0x450/0x450
<4>[ 1203.737747] bus_for_each_dev+0x62/0xa0
<4>[ 1203.737749] driver_attach+0x1e/0x20
<4>[ 1203.737750] bus_add_driver+0x173/0x270
<4>[ 1203.737752] driver_register+0x60/0xe0
<4>[ 1203.737754] __pci_register_driver+0x6b/0x70
<4>[ 1203.737776] i915_init+0x6f/0x78 [i915]
<4>[ 1203.737777] ? 0xffffffffa04e2000
<4>[ 1203.737778] do_one_initcall+0x43/0x170
<4>[ 1203.737779] ? rcu_read_lock_sched_held+0x7a/0x90
<4>[ 1203.737780] ? kmem_cache_alloc_trace+0x270/0x2d0
<4>[ 1203.737782] do_init_module+0x5f/0x206
<4>[ 1203.737783] load_module+0x2581/0x2dd0
<4>[ 1203.737784] ? show_coresize+0x30/0x30
<4>[ 1203.737785] ? kernel_read+0x31/0x50
<4>[ 1203.737787] SyS_finit_module+0xc1/0x100
<4>[ 1203.737788] ? SyS_finit_module+0xc1/0x100
<4>[ 1203.737790] entry_SYSCALL_64_fastpath+0x1c/0xb1
<4>[ 1203.737791] RIP: 0033:0x7feea7eac9f9
<4>[ 1203.737792] RSP: 002b:00007fff7ae23f68 EFLAGS: 00000246 ORIG_RAX:
0000000000000139
<4>[ 1203.737793] RAX: ffffffffffffffda RBX: ffffffff814920c3 RCX:
00007feea7eac9f9
<4>[ 1203.737794] RDX: 0000000000000000 RSI: 000055ed5808d750 RDI:
0000000000000006
<4>[ 1203.737795] RBP: ffffc90000637f88 R08: 0000000000000000 R09:
0000000000000000
<4>[ 1203.737795] R10: 0000000000000006 R11: 0000000000000246 R12:
0000000000000000
<4>[ 1203.737796] R13: 000055ed5808d7a0 R14: 0000000000000000 R15:
000055ed580849e0
<4>[ 1203.737798] ? __this_cpu_preempt_check+0x13/0x20</pre>
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