Re: [dpdk-dev] [PATCH v2] test: fix debug autotest with eal cleanup addition

[Thomas Monjalon <thomas@monjalon.net>]

30/01/2018 19:26, Harry van Haaren:
> Before this patch, the debug_autotest would call fork(),
> call rte_panic() or rte_exit() in the child process, and
> examine the return code to verify that rte_panic() and
> rte_exit() were correctly reporting failures.
> 
> With the inclusion of the rte_eal_cleanup() patch, rte_exit()
> was modified to cleanly tear-down EAL allocations. Currently
> only one library (service cores) is allocated by EAL at startup
> and should be cleaned up. This library has a check on a normal
> (non-hugepage) variable to protect against double cleanup. The
> service cores finalize() function itself frees back hugepage mem.
> 
> Given the fork() approach from the unit test, and the fact that
> the double-free check is on an ordinary variable, causes multiple
> child processed (fork()-ed from the unit-test runner) to attempt
> to free the huge-page memory multiple times. The variable to
> protect against double-cleanup was not effective, as the fork()
> would restore it to show initialized in the next child.
> 
> The solution is to call rte_service_finalize() *before* calling
> fork(), which results in the service cores double-cleanup variable
> to be zero before the fork(), and hence the child processes never
> free the hugepage service-cores memory (correct behavior, as the
> unit-test suite is still running, and owns the hugepages).
> 
> Fixes: aec9c13c5257 ("eal: add function to release internal resources")
> 
> Reported-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>

Applied, thanks