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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Panic on shutdown with AMDGPU and Ubuntu Plymouth"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98638#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Panic on shutdown with AMDGPU and Ubuntu Plymouth"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98638">bug 98638</a>
from <span class="vcard"><a class="email" href="mailto:ernstp@gmail.com" title="Ernst Sjöstrand <ernstp@gmail.com>"> <span class="fn">Ernst Sjöstrand</span></a>
</span></b>
<pre>(gdb) l *(amdgpu_fence_wait_empty+0x29)
0x112d9 is in amdgpu_fence_wait_empty
(drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:270).
270 ptr = &ring->fence_drv.fences[seq &
ring->fence_drv.num_fences_mask];
(gdb) l *(amdgpu_fence_wait_empty+0x2a)
0x112da is in amdgpu_fence_wait_empty (./include/linux/compiler.h:243).
243 __READ_ONCE_SIZE;
(gdb) l *(amdgpu_fence_wait_empty+0x2b)
0x112db is in amdgpu_fence_wait_empty (./include/linux/compiler.h:243).
243 __READ_ONCE_SIZE;
(gdb) l *(amdgpu_fence_wait_empty+0x2c)
0x112dc is in amdgpu_fence_wait_empty (./include/linux/compiler.h:243).
243 __READ_ONCE_SIZE;
(gdb) l *(amdgpu_fence_wait_empty+0x2d)
0x112dd is in amdgpu_fence_wait_empty
(drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:273).
273 if (!fence || !dma_fence_get_rcu(fence)) {
It's not line 270 and not line 273 so I guess it's line 271 or 272:
rcu_read_lock();
fence = rcu_dereference(*ptr);</pre>
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