Good day, I am working on testing various Mesa versions on an AMDGPU driver 
based platform, because I am experiencing this problem
https://youtu.be/Tt44jJ1KDdI
(black / white squares on webpage view)
Firefox bugreport https://bugzilla.mozilla.org/show_bug.cgi?id=1421353
Mesa bugreport https://bugs.freedesktop.org/show_bug.cgi?id=104216

During my tests I found out that the problem occurs when Firefox prints the 
following error messages. What can you tell me about?

Best regards

$ LD_LIBRARY_PATH='mesa18/usr/lib64/' LIBGL_DRIVERS_PATH='mesa18/usr/lib64/dri' 
firefox
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed buffer for 0, -1, 12, 498
[GFX1-]: Failed buffer for 0, 0, 1100, 579
IPDL protocol error: [PNeckoChild] Received an invalid file descriptor!
Sandbox: bad read from pid 2691: Message too long
Sandbox: Unexpected EOF, op 0 flags 00 path 
/usr/share/fonts/dejavu/DejaVuSansMono-Bold.ttf
[GFX1-]: Failed buffer for 0, 0, 1112, 539
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
IPDL protocol error: [PNeckoChild] Received an invalid file descriptor!
IPDL protocol error: [PNeckoChild] Received an invalid file descriptor!
[Parent 2403, Gecko_IOThread] WARNING: SCM_RIGHTS message was truncated 
cmsg_len:20 fd:58: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/chrome/common/ipc_channel_posix.cc,
 line 400
[Child 2586, Chrome_ChildThread] WARNING: pipe error (21): Connection reset by 
peer: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/chrome/common/ipc_channel_posix.cc,
 line 353

###!!! [Child][MessageChannel] Error: 
(msgtype=0x4C0002,name=PLayerTransaction::Msg_Update) Channel error: cannot 
send/recv

[GFX1-]: Receive IPC close with reason=AbnormalShutdown
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 54
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 54
[GFX1-]: Failed buffer for 0, 0, 1100, 768

###!!! [Child][MessageChannel] Error: 
(msgtype=0x4,name=PAPZCTreeManager::Msg_UpdateZoomConstraints) Channel error: 
cannot send/recv

[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 54
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU 
process may have died.
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 54
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 54
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: Failed buffer for 0, 0, 1112, 539
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 54
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 54
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU 
process may have died.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU 
process may have died.
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU 
process may have died.
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: Failed buffer for 0, 0, 1100, 46
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 46
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 46
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 46
[GFX1-]: Failed buffer for 0, 0, 1112, 539
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 46
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU 
process may have died.
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU 
process may have died.
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 46
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 46
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 66
[GFX1-]: Failed to lock new back buffer.
Sandbox: bad read from pid 2635: Message too long
Sandbox: Unexpected EOF, op 0 flags 00 path 
/usr/share/fonts/raleway/Raleway-Regular.otf
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
[GFX1-]: Failed to lock new back buffer.
Sandbox: bad read from pid 2671: Message too long
Sandbox: bad read from pid 2586: Message too long
Sandbox: Unexpected EOF, op 0 flags 00 path 
/usr/lib64/firefox/browser/features/shield-recipe-cli...@mozilla.org.xpi
Sandbox: Unexpected EOF, op 0 flags 00 path 
/usr/lib64/firefox/browser/features/shield-recipe-cli...@mozilla.org.xpi
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 2048
[GFX1-]: Failed buffer for 0, 0, 1100, 66
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 49
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[GFX1-]: Failed buffer for 1100, 0, 12, 539
[GFX1-]: Failed buffer for 0, -1, 12, 48
[GFX1-]: Failed buffer for 0, 0, 1100, 768
[Parent 2403, Main Thread] WARNING: file 
/builddir/build/BUILD/mozilla-release-*cutted_by_me*/ipc/chromium/src/base/shared_memory_posix.cc,
 line 216
IPDL protocol error: [PNeckoChild] Received an invalid file descriptor!
*** logs cutted because they are thousand of lines of code, in particular made 
of messages like <<[GFX1-]: Failed buffer for 0, 0, 1100, 768>>  ***

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