On Tue, 12 Jan 2021 22:48:32 +0000, Will Deacon wrote:

GCC versions >= 4.9 and < 5.1 have been shown to emit memory references
beyond the stack pointer, resulting in memory corruption if an interrupt
is taken after the stack pointer has been adjusted but before the
reference has been executed. This leads to subtle, infrequent data
corruption such as the EXT4 problems reported by Russell King at the
link below.

[...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] compiler.h: Raise minimum version of GCC to 5.1 for arm64
      https://git.kernel.org/arm64/c/1f1244a5ddb7

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Catalin