[dpdk-dev] [PATCH] eal/service: fix exit by resetting service lcores

[Harry van Haaren <harry.van.haaren@intel.com>]

This commit releases all service cores from thier role,
returning them to ROLE_RTE on rte_service_finalize().

This may fix an issue relating to the service cores causing
a race-condition on eal_cleanup(), where the service core
could still be executing while the main thread has already
free-d the service memory, leading to a segfault.

Fixes: 21698354c832 ("service: introduce service cores concept")

Reported-by: David Marchand <david.marchand@redhat.com>
Reported-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>

---

Please note that this patch is being sent to community for
testing as I cannot reliably reproduce the reported issue on
my local setup (despite code-changes in attempts to make the
problem more visible, and instructions from David on how he
can reproduce it). Email discusson on this topic here:
https://mails.dpdk.org/archives/dev/2020-March/159584.html
---
 lib/librte_eal/common/rte_service.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/librte_eal/common/rte_service.c b/lib/librte_eal/common/rte_service.c
index 7e537b8cd..d400ccf79 100644
--- a/lib/librte_eal/common/rte_service.c
+++ b/lib/librte_eal/common/rte_service.c
@@ -122,6 +122,8 @@ rte_service_finalize(void)
 	if (!rte_service_library_initialized)
 		return;
 
+	rte_service_lcore_reset_all();
+
 	rte_free(rte_services);
 	rte_free(lcore_states);
 
-- 
2.17.1