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<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][DRMTIP]igt@gem_mmap_gtt@forked-* - dmesg-warn - WARNING: possible recursive locking detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109665">109665</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[CI][DRMTIP]igt@gem_mmap_gtt@forked-* - dmesg-warn - WARNING: possible recursive locking 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>lakshminarayana.vudum@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/drmtip_221/fi-bwr-2160/igt@gem_mmap_gtt@forked-medium-copy-odd.html">https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_221/fi-bwr-2160/igt@gem_mmap_gtt@forked-medium-copy-odd.html</a>
<6> [41.274834] Console: switching to colour dummy device 80x25
<6> [41.276010] [IGT] gem_mmap_gtt: executing
<6> [41.290041] [IGT] gem_mmap_gtt: starting subtest forked-medium-copy-odd
<6> [41.312553] gem_mmap_gtt (954): drop_caches: 4
<4> [43.184051]
<4> [43.184062] ============================================
<4> [43.184068] WARNING: possible recursive locking detected
<4> [43.184075] 5.0.0-rc6-gbf979a24473a-drmtip_221+ #1 Not tainted
<4> [43.184081] --------------------------------------------
<4> [43.184087] gem_mmap_gtt/955 is trying to acquire lock:
<4> [43.184094] 0000000033218f01
(&dev_priv->gpu_error.reset_backoff_srcu){+.+.}, at:
i915_reset_trylock+0x0/0x310 [i915]
<4> [43.184257]
but task is already holding lock:
<4> [43.184263] 0000000033218f01
(&dev_priv->gpu_error.reset_backoff_srcu){+.+.}, at:
i915_reset_trylock+0x192/0x310 [i915]
<4> [43.184327]
other info that might help us debug this:
<4> [43.184334] Possible unsafe locking scenario:
<4> [43.184339] CPU0
<4> [43.184343] ----
<4> [43.184346] lock(&dev_priv->gpu_error.reset_backoff_srcu);
<4> [43.184353] lock(&dev_priv->gpu_error.reset_backoff_srcu);
<4> [43.184359]
*** DEADLOCK ***
<4> [43.184367] May be due to missing lock nesting notation
<4> [43.184375] 5 locks held by gem_mmap_gtt/955:
<4> [43.184381] #0: 00000000e57e5973 (&mm->mmap_sem){++++}, at:
__do_page_fault+0x133/0x500
<4> [43.184396] #1: 00000000bbf04b65 (&dev->struct_mutex){+.+.}, at:
i915_gem_fault+0x1f6/0x860 [i915]
<4> [43.184470] #2: 0000000033218f01
(&dev_priv->gpu_error.reset_backoff_srcu){+.+.}, at:
i915_reset_trylock+0x192/0x310 [i915]
<4> [43.184536] #3: 00000000be208d84 (fs_reclaim){+.+.}, at:
fs_reclaim_acquire.part.25+0x0/0x30
<4> [43.184549] #4: 00000000075d88fb (shrinker_rwsem){++++}, at:
shrink_slab+0x1cb/0x2c0
<4> [43.184561]
stack backtrace:
<4> [43.184569] CPU: 1 PID: 955 Comm: gem_mmap_gtt Not tainted
5.0.0-rc6-gbf979a24473a-drmtip_221+ #1
<4> [43.184578] Hardware name: Dell Inc. OptiPlex 745
/0GW726, BIOS 2.3.1 05/21/2007
<4> [43.184588] Call Trace:
<4> [43.184597] dump_stack+0x67/0x9b
<4> [43.184606] __lock_acquire+0xc75/0x1b00
<4> [43.184615] ? arch_tlb_finish_mmu+0x2a/0xa0
<4> [43.184622] ? tlb_finish_mmu+0x1a/0x30
<4> [43.184629] ? zap_page_range_single+0xe2/0x130
<4> [43.184637] ? lock_acquire+0xa6/0x1c0
<4> [43.184643] lock_acquire+0xa6/0x1c0
<4> [43.184701] ? i915_clear_error_registers+0x280/0x280 [i915]
<4> [43.184762] i915_reset_trylock+0x44/0x310 [i915]
<4> [43.184823] ? i915_clear_error_registers+0x280/0x280 [i915]
<4> [43.184831] ? lockdep_hardirqs_on+0xe0/0x1b0
<4> [43.184840] ? _raw_spin_unlock_irqrestore+0x39/0x60
<4> [43.184906] fence_update+0x218/0x470 [i915]
<4> [43.184979] i915_vma_unbind+0xa6/0x550 [i915]
<4> [43.185048] i915_gem_object_unbind+0xfa/0x190 [i915]
<4> [43.185121] i915_gem_shrink+0x2dc/0x590 [i915]
<4> [43.185193] ? i915_gem_shrinker_count+0xd6/0x140 [i915]
<4> [43.185264] ? i915_gem_shrinker_scan+0xc9/0x130 [i915]
<4> [43.185333] i915_gem_shrinker_scan+0xc9/0x130 [i915]
<4> [43.185342] do_shrink_slab+0x143/0x3f0
<4> [43.185350] shrink_slab+0x228/0x2c0
<4> [43.185358] shrink_node+0x167/0x450
<4> [43.185366] do_try_to_free_pages+0xc4/0x340
<4> [43.185373] try_to_free_pages+0xdc/0x2e0
<4> [43.185382] __alloc_pages_nodemask+0x662/0x1110
<4> [43.185393] ? reacquire_held_locks+0xb5/0x1b0
<4> [43.185400] ? reacquire_held_locks+0xb5/0x1b0
<4> [43.185458] ? i915_reset_trylock+0x192/0x310 [i915]
<4> [43.185517] ? i915_memcpy_init_early+0x30/0x30 [i915]
<4> [43.185526] pte_alloc_one+0x12/0x70
<4> [43.185532] __pte_alloc+0x11/0xf0
<4> [43.185538] apply_to_page_range+0x37e/0x440
<4> [43.185599] remap_io_mapping+0x6c/0x100 [i915]
<4> [43.185668] i915_gem_fault+0x5a9/0x860 [i915]
<4> [43.185676] ? ptlock_alloc+0x15/0x30
<4> [43.185684] __do_fault+0x2c/0xb0
<4> [43.185690] __handle_mm_fault+0x8ee/0xfa0
<4> [43.185699] handle_mm_fault+0x196/0x3a0
<4> [43.185707] __do_page_fault+0x246/0x500
<4> [43.185715] ? page_fault+0x8/0x30
<4> [43.185721] page_fault+0x1e/0x30
<4> [43.185728] RIP: 0033:0x55e32d37ee12
<4> [43.185736] Code: b0 df ff ff 89 c2 8b 85 70 df ff ff 01 c2 8b 85 70 df ff
ff 48 98 48 8d 0c 85 00 00 00 00 48 8b 85 e0 df ff ff 48 01 c8 f7 d2 <89> 10 83
85 70 df ff ff 01 81 bd 70 df ff ff ff 03 00 00 7e be 48
<4> [43.185752] RSP: 002b:00007fffd2ee9da0 EFLAGS: 00010206
<4> [43.185759] RAX: 00007f48a78d9000 RBX: 0000000000000000 RCX:
0000000000000000
<4> [43.185767] RDX: 00000000ffffffff RSI: 0000000000005401 RDI:
0000000000000002
<4> [43.185775] RBP: 00007fffd2eebe60 R08: 00007fffd2ee9c10 R09:
000000000000001b
<4> [43.185782] R10: 7165722074736554 R11: 0000000000000246 R12:
000055e32d37ca80
<4> [43.185790] R13: 00007fffd2eec250 R14: 0000000000000000 R15:
0000000000000000
<4> [45.851997] ------------[ cut here ]------------
<4> [45.852016] downgrading a read lock
<4> [45.852037] WARNING: CPU: 1 PID: 956 at kernel/locking/lockdep.c:3553
lock_downgrade+0x158/0x1e0
<4> [45.852050] Modules linked in: i915 snd_hda_codec_analog
snd_hda_codec_generic coretemp snd_hda_intel snd_hda_codec snd_hwdep
snd_hda_core snd_pcm i2c_i801 tg3 lpc_ich prime_numbers
<4> [45.852075] CPU: 1 PID: 956 Comm: gem_mmap_gtt Not tainted
5.0.0-rc6-gbf979a24473a-drmtip_221+ #1
<4> [45.852085] Hardware name: Dell Inc. OptiPlex 745
/0GW726, BIOS 2.3.1 05/21/2007
<4> [45.852097] RIP: 0010:lock_downgrade+0x158/0x1e0
<4> [45.852104] Code: ff e9 23 ff ff ff 4c 89 ea 4c 89 f6 48 89 df e8 2e bd ff
ff 85 c0 74 aa eb 9a 48 c7 c7 b2 fb 06 83 48 89 04 24 e8 b8 bf f9 ff <0f> 0b 8b
54 24 0c 48 8b 04 24 e9 46 ff ff ff e8 44 01 3a 00 85 c0
<4> [45.852120] RSP: 0018:ffff9d950027fe38 EFLAGS: 00010082
<4> [45.852127] RAX: 0000000000000000 RBX: ffff9492edb70040 RCX:
0000000000000000
<4> [45.852135] RDX: ffffffff821287fb RSI: 0000000000000001 RDI:
ffffffff82128810
<4> [45.852143] RBP: 0000000000000002 R08: 646172676e776f64 R09:
0000000000000000
<4> [45.852151] R10: 0000000000000000 R11: 6b636f6c20646165 R12:
0000000000000246
<4> [45.852158] R13: ffffffff82210e03 R14: ffff9492f83af548 R15:
ffff9492f9a4f4d8
<4> [45.852167] FS: 00007f48c3de6980(0000) GS:ffff9492fe040000(0000)
knlGS:0000000000000000
<4> [45.852175] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [45.852182] CR2: 00007f48b7853ff8 CR3: 000000002ec82000 CR4:
00000000000006e0
<4> [45.852190] Call Trace:
<4> [45.852199] downgrade_write+0x12/0x80
<4> [45.852207] __do_munmap+0x393/0x400
<4> [45.852215] __vm_munmap+0x6e/0xc0
<4> [45.852222] __x64_sys_munmap+0x12/0x20
<4> [45.852230] do_syscall_64+0x55/0x190
<4> [45.852239] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [45.852247] RIP: 0033:0x7f48c348cab7
<4> [45.852254] Code: 10 e9 67 ff ff ff 0f 1f 44 00 00 48 8b 15 c9 f3 2c 00 f7
d8 64 89 02 48 c7 c0 ff ff ff ff e9 6b ff ff ff b8 0b 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d a1 f3 2c 00 f7 d8 64 89 01 48
<4> [45.852270] RSP: 002b:00007fffd2ee9d98 EFLAGS: 00000246 ORIG_RAX:
000000000000000b
<4> [45.852279] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00007f48c348cab7
<4> [45.852287] RDX: 0000000008000000 RSI: 0000000008000000 RDI:
00007f48af8d9000
<4> [45.852294] RBP: 00007fffd2eebe60 R08: 00007fffd2ee9c10 R09:
00007fe4ffff801c
<4> [45.852301] R10: 00007fe6ffff801a R11: 0000000000000246 R12:
000055e32d37ca80
<4> [45.852309] R13: 00007fffd2eec250 R14: 0000000000000000 R15:
0000000000000000
<4> [45.852319] irq event stamp: 565894
<4> [45.852326] hardirqs last enabled at (565893): [<ffffffff829a1e0c>]
_raw_spin_unlock_irqrestore+0x4c/0x60
<4> [45.852337] hardirqs last disabled at (565894): [<ffffffff8299aa5a>]
__schedule+0xaa/0xb40
<4> [45.852347] softirqs last enabled at (565544): [<ffffffff82c0033a>]
__do_softirq+0x33a/0x4b9
<4> [45.852358] softirqs last disabled at (565537): [<ffffffff820b9a91>]
irq_exit+0xd1/0xe0
<4> [45.852369] WARNING: CPU: 1 PID: 956 at kernel/locking/lockdep.c:3553
lock_downgrade+0x158/0x1e0
<4> [45.852378] ---[ end trace 5334b9b1c50b712d ]---
<4> [45.881027] ------------[ cut here ]------------
<4> [45.881044] downgrading a read lock
<4> [45.881063] WARNING: CPU: 0 PID: 955 at kernel/locking/lockdep.c:3553
lock_downgrade+0x158/0x1e0
<4> [45.881076] Modules linked in: i915 snd_hda_codec_analog
snd_hda_codec_generic coretemp snd_hda_intel snd_hda_codec snd_hwdep
snd_hda_core snd_pcm i2c_i801 tg3 lpc_ich prime_numbers
<4> [45.881103] CPU: 0 PID: 955 Comm: gem_mmap_gtt Tainted: G W
5.0.0-rc6-gbf979a24473a-drmtip_221+ #1
<4> [45.881114] Hardware name: Dell Inc. OptiPlex 745
/0GW726, BIOS 2.3.1 05/21/2007
<4> [45.881126] RIP: 0010:lock_downgrade+0x158/0x1e0
<4> [45.881133] Code: ff e9 23 ff ff ff 4c 89 ea 4c 89 f6 48 89 df e8 2e bd ff
ff 85 c0 74 aa eb 9a 48 c7 c7 b2 fb 06 83 48 89 04 24 e8 b8 bf f9 ff <0f> 0b 8b
54 24 0c 48 8b 04 24 e9 46 ff ff ff e8 44 01 3a 00 85 c0
<4> [45.881149] RSP: 0018:ffff9d9500273e38 EFLAGS: 00010082
<4> [45.881157] RAX: 0000000000000000 RBX: ffff9492ee0bccc0 RCX:
0000000000000000
<4> [45.881165] RDX: ffffffff821287fb RSI: 0000000000000001 RDI:
ffffffff82128810
<4> [45.881172] RBP: 0000000000000005 R08: 646172676e776f64 R09:
0000000000000000
<4> [45.881180] R10: 0000000000000000 R11: 6b636f6c20646165 R12:
0000000000000246
<4> [45.881188] R13: ffffffff82210e03 R14: ffff9492f83a8fc8 R15:
ffff9492edae2cb8
<4> [45.881196] FS: 00007f48c3de6980(0000) GS:ffff9492fe000000(0000)
knlGS:0000000000000000
<4> [45.881205] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [45.881212] CR2: 00007f48b7853ff8 CR3: 000000003621c000 CR4:
00000000000006f0
<4> [45.881219] Call Trace:
<4> [45.881228] downgrade_write+0x12/0x80
<4> [45.881238] __do_munmap+0x393/0x400
<4> [45.881245] __vm_munmap+0x6e/0xc0
<4> [45.881253] __x64_sys_munmap+0x12/0x20
<4> [45.881260] do_syscall_64+0x55/0x190
<4> [45.881271] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [45.881279] RIP: 0033:0x7f48c348cab7
<4> [45.881285] Code: 10 e9 67 ff ff ff 0f 1f 44 00 00 48 8b 15 c9 f3 2c 00 f7
d8 64 89 02 48 c7 c0 ff ff ff ff e9 6b ff ff ff b8 0b 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d a1 f3 2c 00 f7 d8 64 89 01 48
<4> [45.881301] RSP: 002b:00007fffd2ee9d98 EFLAGS: 00000246 ORIG_RAX:
000000000000000b
<4> [45.881310] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00007f48c348cab7
<4> [45.881318] RDX: 0000000008000000 RSI: 0000000008000000 RDI:
00007f48af8d9000
<4> [45.881325] RBP: 00007fffd2eebe60 R08: 00007fffd2ee9c10 R09:
00007fe4ffff801c
<4> [45.881333] R10: 00007fe6ffff801a R11: 0000000000000246 R12:
000055e32d37ca80
<4> [45.881340] R13: 00007fffd2eec250 R14: 0000000000000000 R15:
0000000000000000
<4> [45.881350] irq event stamp: 580823
<4> [45.881357] hardirqs last enabled at (580823): [<ffffffff829a1e0c>]
_raw_spin_unlock_irqrestore+0x4c/0x60
<4> [45.881368] hardirqs last disabled at (580822): [<ffffffff829a1c7d>]
_raw_spin_lock_irqsave+0xd/0x50
<4> [45.881379] softirqs last enabled at (580820): [<ffffffff82c0033a>]
__do_softirq+0x33a/0x4b9
<4> [45.881390] softirqs last disabled at (580813): [<ffffffff820b9a91>]
irq_exit+0xd1/0xe0
<4> [45.881401] WARNING: CPU: 0 PID: 955 at kernel/locking/lockdep.c:3553
lock_downgrade+0x158/0x1e0
<4> [45.881410] ---[ end trace 5334b9b1c50b712e ]---
<6> [46.893263] gem_mmap_gtt (956) used greatest stack depth: 11992 bytes left
<6> [46.893624] [IGT] gem_mmap_gtt: exiting, ret=0
<6> [47.049826] Console: switching to colour frame buffer device 240x67</pre>
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