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When memory-hotplugged, new memblock nodes will be added by using standard Linux kernel API:

*add_memory_driver_managed() -> add_memory_resource() -> memblock_add_node() -> memblock_add_range(&memblock.memory, base, size, nid, flags) -> memblock_insert_region(&memblock.memory)*

At this time dm_verity driver, which allocates/uses memory, have to check if its allocated memory is valid or not by using standard Linux kernel API:

* verity_work() -> sg_init_one() -> sg_set_buf() -> virt_addr_valid() -> pfn_is_map_memory() -> memblock_is_map_memory() -> memblock_search(&memblock.memory, addr);*

Due to the competition for memblock, there will trigger BUG_ON in "sg_set_buf()" of dm_verity driver.

Is this a kenel mainline problem or is add_memory_driver_managed used incorrectly?

Find the root cause.

本文标签： linuxsgsetbuf reports an error when hotplugging memoryStack Overflow

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