From: Thomas Monjalon <thomas@monjalon.net>
To: Harry van Haaren <harry.van.haaren@intel.com>
Cc: dev@dpdk.org, pbhagavatula@caviumnetworks.com
Subject: Re: [dpdk-dev] [PATCH v2] test: fix debug autotest with eal cleanup addition
Date: Wed, 31 Jan 2018 00:53:32 +0100 [thread overview]
Message-ID: <3782343.bUdYi8yfN7@xps> (raw)
In-Reply-To: <1517336769-18052-1-git-send-email-harry.van.haaren@intel.com>
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
next prev parent reply other threads:[~2018-01-30 23:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-30 18:21 [dpdk-dev] [PATCH] " Harry van Haaren
2018-01-30 18:26 ` [dpdk-dev] [PATCH v2] " Harry van Haaren
2018-01-30 23:53 ` Thomas Monjalon [this message]
2018-01-31 13:53 ` Ananyev, Konstantin
2018-01-31 14:31 ` Thomas Monjalon
2018-01-31 14:54 ` Van Haaren, Harry
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