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<body><span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][SHARDS]igt@gem_persistent_relocs@forked-interruptible-thrashing|igt@gem_pipe_control_store_loop@reused-buffer - dmesg-warn - WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111783">bug 111783</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">i915 features</td>
<td>
</td>
<td>GEM/Other
</td>
</tr>
<tr>
<td style="text-align:right;">i915 platform</td>
<td>
</td>
<td>GLK, BYT
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][SHARDS]igt@gem_persistent_relocs@forked-interruptible-thrashing|igt@gem_pipe_control_store_loop@reused-buffer - dmesg-warn - WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111783#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][SHARDS]igt@gem_persistent_relocs@forked-interruptible-thrashing|igt@gem_pipe_control_store_loop@reused-buffer - dmesg-warn - WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111783">bug 111783</a>
from <span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span></b>
<pre><a href="https://intel-gfx-ci.01.org/tree/drm-tip/IGT_5194/shard-glk1/igt@gem_pipe_control_store_loop@reused-buffer.html">https://intel-gfx-ci.01.org/tree/drm-tip/IGT_5194/shard-glk1/igt@gem_pipe_control_store_loop@reused-buffer.html</a>
<6> [2763.705978] Console: switching to colour dummy device 80x25
<6> [2763.706073] [IGT] gem_pipe_control_store_loop: executing
<6> [2763.719176] [IGT] gem_pipe_control_store_loop: starting subtest
reused-buffer
<4> [2799.682286]
<4> [2799.682295] =====================================================
<4> [2799.682300] WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
<4> [2799.682305] 5.3.0-CI-CI_DRM_6927+ #1 Tainted: G U
<4> [2799.682309] -----------------------------------------------------
<4> [2799.682313] kworker/u8:15/3290 [HC0[0]:SC0[0]:HE0:SE1] is trying to
acquire:
<4> [2799.682318] ffff888273cd9e08 (&(&lock->wait_lock)->rlock){+.+.}, at:
__mutex_unlock_slowpath+0x18e/0x2b0
<4> [2799.682331]
and this task is already holding:
<4> [2799.682335] ffff88825db5c320 (&(&timelines->lock)->rlock){-...}, at:
i915_retire_requests+0x14c/0x2e0 [i915]
<4> [2799.682435] which would create a new lock dependency:
<4> [2799.682438] (&(&timelines->lock)->rlock){-...} ->
(&(&lock->wait_lock)->rlock){+.+.}
<4> [2799.682444]
but this new dependency connects a HARDIRQ-irq-safe lock:
<4> [2799.682448] (&(&timelines->lock)->rlock){-...}
<4> [2799.682449]
... which became HARDIRQ-irq-safe at:
<4> [2799.682459] lock_acquire+0xa6/0x1c0
<4> [2799.682464] _raw_spin_lock_irqsave+0x33/0x50
<4> [2799.682527] intel_timeline_enter+0x64/0x150 [i915]
<4> [2799.682588] __engine_park+0xa9/0x380 [i915]
<4> [2799.682648] ____intel_wakeref_put_last+0x1c/0x70 [i915]
<4> [2799.682707] i915_sample+0x2ed/0x310 [i915]
<4> [2799.682712] __hrtimer_run_queues+0x11e/0x4b0
<4> [2799.682717] hrtimer_interrupt+0xea/0x250
<4> [2799.682722] smp_apic_timer_interrupt+0x96/0x280
<4> [2799.682726] apic_timer_interrupt+0xf/0x20
<4> [2799.682730] mutex_spin_on_owner+0x81/0x140
<4> [2799.682733] __mutex_lock+0x5f9/0x9b0
<4> [2799.682796] __i915_gem_free_objects+0x7b/0x4b0 [i915]
<4> [2799.682802] process_one_work+0x245/0x610
<4> [2799.682805] worker_thread+0x37/0x380
<4> [2799.682810] kthread+0x119/0x130
<4> [2799.682813] ret_from_fork+0x24/0x50
<4> [2799.682816]
to a HARDIRQ-irq-unsafe lock:
<4> [2799.682820] (&(&lock->wait_lock)->rlock){+.+.}
<4> [2799.682821]
... which became HARDIRQ-irq-unsafe at:
<4> [2799.682827] ...
<4> [2799.682829] lock_acquire+0xa6/0x1c0
<4> [2799.682834] _raw_spin_lock+0x2a/0x40
<4> [2799.682837] __mutex_lock+0x18a/0x9b0
<4> [2799.682842] pipe_wait+0x8f/0xc0
<4> [2799.682845] pipe_read+0x235/0x310
<4> [2799.682849] new_sync_read+0x106/0x1a0
<4> [2799.682853] vfs_read+0x9e/0x160
<4> [2799.682856] ksys_read+0x8f/0xe0
<4> [2799.682860] do_syscall_64+0x4f/0x210
<4> [2799.682864] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [2799.682867]
other info that might help us debug this:
<4> [2799.682873] Possible interrupt unsafe locking scenario:
<4> [2799.682877] CPU0 CPU1
<4> [2799.682880] ---- ----
<4> [2799.682883] lock(&(&lock->wait_lock)->rlock);
<4> [2799.682887] local_irq_disable();
<4> [2799.682890]
lock(&(&timelines->lock)->rlock);
<4> [2799.682895]
lock(&(&lock->wait_lock)->rlock);
<4> [2799.682899] <Interrupt>
<4> [2799.682901] lock(&(&timelines->lock)->rlock);
<4> [2799.682905]
*** DEADLOCK ***</pre>
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