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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][SHARDS] GLK: igt@eio@kms - dmesg-warn - WARNING: possible circular locking dependency detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111882">111882</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[CI][SHARDS] GLK: igt@eio@kms - 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>not set
</td>
</tr>
<tr>
<th>Priority</th>
<td>not set
</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/CI_DRM_6983/shard-glk7/igt@gem_eio@kms.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6983/shard-glk7/igt@gem_eio@kms.html</a>
<4> [1429.580580] ======================================================
<4> [1429.580583] WARNING: possible circular locking dependency detected
<4> [1429.580588] 5.4.0-rc1-CI-CI_DRM_6983+ #1 Tainted: G U
<4> [1429.580592] ------------------------------------------------------
<4> [1429.580596] gem_eio/3607 is trying to acquire lock:
<4> [1429.580599] ffff88825cc502d8 (&mapping->i_mmap_rwsem){++++}, at:
unmap_mapping_pages+0x48/0x130
<4> [1429.580612]
but task is already holding lock:
<4> [1429.580616] ffff88826169c5b0 (>->reset.mutex){+.+.}, at:
intel_gt_reset+0x5f/0x3c0 [i915]
<4> [1429.580710]
which lock already depends on the new lock.
<4> [1429.580714]
the existing dependency chain (in reverse order) is:
<4> [1429.580718]
-> #3 (>->reset.mutex){+.+.}:
<4> [1429.580788] i915_request_wait+0xf8/0x870 [i915]
<4> [1429.580854] i915_active_wait+0x13c/0x280 [i915]
<4> [1429.580921] i915_vma_unbind+0x1c5/0x4a0 [i915]
<4> [1429.580986] eb_lookup_vmas+0x4ea/0x11a0 [i915]
<4> [1429.581049] i915_gem_do_execbuffer+0x601/0x2360 [i915]
<4> [1429.581113] i915_gem_execbuffer2_ioctl+0x11b/0x460 [i915]
<4> [1429.581119] drm_ioctl_kernel+0xa7/0xf0
<4> [1429.581123] drm_ioctl+0x2e1/0x390
<4> [1429.581128] do_vfs_ioctl+0xa0/0x6f0
<4> [1429.581132] ksys_ioctl+0x35/0x60
<4> [1429.581135] __x64_sys_ioctl+0x11/0x20
<4> [1429.581140] do_syscall_64+0x4f/0x210
<4> [1429.581146] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [1429.581150]
-> #2 (i915_active){+.+.}:
<4> [1429.581216] i915_active_wait+0x4a/0x280 [i915]
<4> [1429.581283] i915_vma_unbind+0x1c5/0x4a0 [i915]
<4> [1429.581348] i915_gem_object_unbind+0x153/0x1c0 [i915]
<4> [1429.581415] userptr_mn_invalidate_range_start+0x9f/0x200 [i915]
<4> [1429.581421] __mmu_notifier_invalidate_range_start+0xa3/0x180
<4> [1429.581426] unmap_vmas+0x143/0x150
<4> [1429.581430] unmap_region+0xa3/0x100
<4> [1429.581434] __do_munmap+0x25d/0x490
<4> [1429.581437] __vm_munmap+0x6e/0xc0
<4> [1429.581441] __x64_sys_munmap+0x12/0x20
<4> [1429.581445] do_syscall_64+0x4f/0x210
<4> [1429.581449] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [1429.581452]
-> #1 (mmu_notifier_invalidate_range_start){+.+.}:
<4> [1429.581459] page_mkclean_one+0xda/0x210
<4> [1429.581463] rmap_walk_file+0xff/0x260
<4> [1429.581467] page_mkclean+0x9f/0xb0
<4> [1429.581471] clear_page_dirty_for_io+0xa2/0x300
<4> [1429.581477] mpage_submit_page+0x1a/0x70
<4> [1429.581481] mpage_process_page_bufs+0xe7/0x110
<4> [1429.581485] mpage_prepare_extent_to_map+0x1d2/0x2b0
<4> [1429.581490] ext4_writepages+0x592/0x1230
<4> [1429.581493] do_writepages+0x46/0xe0
<4> [1429.581498] __filemap_fdatawrite_range+0xc6/0x100
<4> [1429.581502] file_write_and_wait_range+0x3c/0x90
<4> [1429.581506] ext4_sync_file+0x154/0x500
<4> [1429.581511] do_fsync+0x33/0x60
<4> [1429.581514] __x64_sys_fsync+0xb/0x10
<4> [1429.581518] do_syscall_64+0x4f/0x210
<4> [1429.581522] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [1429.581526]
-> #0 (&mapping->i_mmap_rwsem){++++}:
<4> [1429.581533] __lock_acquire+0x1328/0x15d0
<4> [1429.581537] lock_acquire+0xa7/0x1c0
<4> [1429.581541] down_write+0x33/0x70
<4> [1429.581545] unmap_mapping_pages+0x48/0x130
<4> [1429.581606] intel_gt_reset+0x142/0x3c0 [i915]
<4> [1429.581668] intel_gt_reset_global+0xe0/0x150 [i915]
<4> [1429.581729] intel_gt_handle_error+0x184/0x3b0 [i915]
<4> [1429.581788] i915_wedged_set+0x5b/0xc0 [i915]
<4> [1429.581793] simple_attr_write+0xb0/0xd0
<4> [1429.581799] full_proxy_write+0x51/0x80
<4> [1429.581803] vfs_write+0xb9/0x1d0
<4> [1429.581807] ksys_write+0x9f/0xe0
<4> [1429.581810] do_syscall_64+0x4f/0x210
<4> [1429.581814] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [1429.581818]
other info that might help us debug this:
<4> [1429.581823] Chain exists of:
&mapping->i_mmap_rwsem --> i915_active --> >->reset.mutex
<4> [1429.581830] Possible unsafe locking scenario:
<4> [1429.581834] CPU0 CPU1
<4> [1429.581837] ---- ----
<4> [1429.581840] lock(>->reset.mutex);
<4> [1429.581843] lock(i915_active);
<4> [1429.581847] lock(>->reset.mutex);
<4> [1429.581851] lock(&mapping->i_mmap_rwsem);
<4> [1429.581854]
*** DEADLOCK ***
<4> [1429.581859] 3 locks held by gem_eio/3607:
<4> [1429.581862] #0: ffff88827652a6b0 (sb_writers#14){.+.+}, at:
vfs_write+0x1a4/0x1d0
<4> [1429.581869] #1: ffff88826168ea58 (&attr->mutex){+.+.}, at:
simple_attr_write+0x36/0xd0
<4> [1429.581877] #2: ffff88826169c5b0 (>->reset.mutex){+.+.}, at:
intel_gt_reset+0x5f/0x3c0 [i915]
<4> [1429.581941]
stack backtrace:
<4> [1429.581946] CPU: 1 PID: 3607 Comm: gem_eio Tainted: G U
5.4.0-rc1-CI-CI_DRM_6983+ #1
<4> [1429.581952] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, BIOS
JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
<4> [1429.581958] Call Trace:
<4> [1429.581964] dump_stack+0x67/0x9b
<4> [1429.581969] check_noncircular+0x19b/0x1c0
<4> [1429.581975] ? __lock_acquire+0x1328/0x15d0
<4> [1429.581979] __lock_acquire+0x1328/0x15d0
<4> [1429.581985] ? trace_vbprintk+0x16a/0x210
<4> [1429.581989] lock_acquire+0xa7/0x1c0
<4> [1429.581994] ? unmap_mapping_pages+0x48/0x130
<4> [1429.581999] down_write+0x33/0x70
<4> [1429.582002] ? unmap_mapping_pages+0x48/0x130
<4> [1429.582007] unmap_mapping_pages+0x48/0x130
<4> [1429.582068] intel_gt_reset+0x142/0x3c0 [i915]
<4> [1429.582129] intel_gt_reset_global+0xe0/0x150 [i915]
<4> [1429.582191] ? intel_gt_set_wedged+0x70/0x70 [i915]
<4> [1429.582197] ? queue_work_node+0x70/0x70
<4> [1429.582258] intel_gt_handle_error+0x184/0x3b0 [i915]
<4> [1429.582320] i915_wedged_set+0x5b/0xc0 [i915]
<4> [1429.582326] ? simple_strtoull+0x3b/0x70
<4> [1429.582331] simple_attr_write+0xb0/0xd0
<4> [1429.582335] full_proxy_write+0x51/0x80
<4> [1429.582340] vfs_write+0xb9/0x1d0
<4> [1429.582343] ksys_write+0x9f/0xe0
<4> [1429.582347] do_syscall_64+0x4f/0x210
<4> [1429.582352] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [1429.582357] RIP: 0033:0x7fbe9a73c281
<4> [1429.582362] Code: c3 0f 1f 84 00 00 00 00 00 48 8b 05 59 8d 20 00 c3 0f
1f 84 00 00 00 00 00 8b 05 8a d1 20 00 85 c0 75 16 b8 01 00 00 00 0f 05 <48> 3d
00 f0 ff ff 77 57 f3 c3 0f 1f 44 00 00 41 54 55 49 89 d4 53
<4> [1429.582371] RSP: 002b:00007ffe335e7b78 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
<4> [1429.582377] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00007fbe9a73c281
<4> [1429.582381] RDX: 0000000000000002 RSI: 00007fbe9adcf0e2 RDI:
0000000000000009
<4> [1429.582385] RBP: 0000000000000002 R08: 0000000000000000 R09:
0000000000000034
<4> [1429.582389] R10: 0000000000000000 R11: 0000000000000246 R12:
00007fbe9adcf0e2
<4> [1429.582394] R13: 0000000000000009 R14: 00007ffe335e7d60 R15:
0000000000000040
<7> [1429.589338] [IGT] Checking that the GPU recovered</pre>
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