https://github.com/torvalds/linux
Revision cdc1e6e225e3256d56dc6648411630e71d7c776b authored by Hugh Dickins on 02 October 2021, 10:17:29 UTC, committed by Linus Torvalds on 02 October 2021, 16:39:15 UTC
5.15-rc1 crashes with blank screen when booting up on two ThinkPads
using i915.  Bisections converge convincingly, but arrive at different
and suprising "culprits", none of them the actual culprit.

netconsole (with init_netconsole() hacked to call i915_init() when
logging has started, instead of by module_init()) tells the story:

kernel BUG at drivers/gpu/drm/i915/i915_sw_fence.c:245!
with RSI: ffffffff814d408b pointing to sw_fence_dummy_notify().
I've been building with CONFIG_CC_OPTIMIZE_FOR_SIZE=y, and that
function needs to be 4-byte aligned.

Fixes: 62eaf0ae217d ("drm/i915/guc: Support request cancellation")
Signed-off-by: Hugh Dickins <hughd@google.com>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 53d5fc8
History
Tip revision: cdc1e6e225e3256d56dc6648411630e71d7c776b authored by Hugh Dickins on 02 October 2021, 10:17:29 UTC
drm/i915: fix blank screen booting crashes
Tip revision: cdc1e6e
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