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...20108 add.w r1, r2, #8 @ 0x800000044 f8cc1000 str.w r1, [ip]00000048 f3bf8f5a dmb ishst0000004c 9901 ldr r1, [sp, #4]0000004e e8512f00 ldrex r2, [r1]00000052 9200 str r2, [sp, #0]00000054 441a add r2, r300000056 e8412c00 strex ip, r2, [r1]0000005a f1bc0f00 cmp.w ip, #0 @ 0x00000005e d1f6 bne.n 0x4e... What happens in the code between 4e and 5e is an atomic check of a variable by the inlined __exchange_and_add. The problem is that the result read by ldrex is stored by the inline optimization on the stack for further use. However, as the atomically read variable is also on the stack...