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This reverts commit fb97d2eb

.

The logging was questionable to begin with, but it seems to actively
deadlock on the task lock.

 "On second thought, let's not log core dump failures. 'Tis a silly place"

because if you can't tell your core dump is truncated, maybe you should
just fix your debugger instead of adding bugs to the kernel.
Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Link: https://lore.kernel.org/all/d122ece6-3606-49de-ae4d-8da88846bef2@oracle.com/

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>