rte_malloc_socket failed to allocate with large alignment and ASan

https://bugs.dpdk.org/show_bug.cgi?id=1708

Bug ID: 1708
Summary: rte_malloc_socket failed to allocate with large
alignment and ASan
Product: DPDK
Version: 21.11
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---

After commit f92b9ebed03dbd140a5a7b921cb898e661a59068, I am unable to allocate 1MiB aligned 1MiB with rte_malloc_socket when DPDK is built with ASan.

Enter try_expand_heap_primary with pg_sz=0x200000, elt_size=0x100000, align=0x100000
alloc_sz is set to 0x200000
Enter alloc_pages_on_heap
Enter find_suitable_element
Enter elem_start_pt with elem of size 0x200000 MALLOC_ELEM_TRAILER_LEN is non zero because of ASan new_data_start is equal to elem because of alignment
There is no room for the header and it fails.

If my analysis is correct the formula used in try_expand_heap_primary to compute alloc_sz is off. I suggest something like:

alloc_sz = RTE_ALIGN_CEIL(RTE_ALIGN_CEIL(elt_size + MALLOC_ELEM_TRAILER_LEN, align) + MALLOC_ELEM_HEADER_LEN, pg_sz);

I am working with branch 21.11, but I think this issue affects all the branches which contain commit f92b9ebed03dbd140a5a7b921cb898e661a59068

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