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8f198ffb2e
The static loop task TCB and stack added in #15659 had no explicit section attribute, so under some sdkconfig combinations (notably CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY) the linker can place them in PSRAM. That is unsafe when CONFIG_SPIRAM_XIP_FROM_PSRAM is also enabled, because the running task's stack must stay reachable while the flash cache is disabled (asserted by esp_task_stack_is_sane_cache_disabled). DRAM_ATTR keeps both objects in internal DRAM regardless of those configs.
