[dpdk-stable] [PATCH] mempool: fix invalid panic on dump or audit

[dpdk-stable] [PATCH] mempool: fix invalid panic on dump or audit

[Olivier Matz]

When doing a mempool dump or an audit, the application can panic because
the length of the cache is greater than the flush threshold, which is
seen as a fatal error. But this can temporarily happen when the mempool
is in use.

Fix the panic condition to abort only when the cache length is greater
than the array.

Fixes: ea5dd2744b90 ("mempool: cache optimisations")
Cc: stable@dpdk.org

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 lib/librte_mempool/rte_mempool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index b9f3fbd614..afb1239c8d 100644
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -1167,7 +1167,7 @@ mempool_audit_cache(const struct rte_mempool *mp)
 	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
 		const struct rte_mempool_cache *cache;
 		cache = &mp->local_cache[lcore_id];
-		if (cache->len > cache->flushthresh) {
+		if (cache->len > RTE_DIM(cache->objs)) {
 			RTE_LOG(CRIT, MEMPOOL, "badness on cache[%u]\n",
 				lcore_id);
 			rte_panic("MEMPOOL: invalid cache len\n");
-- 
2.29.2

Re: [dpdk-stable] [PATCH] mempool: fix invalid panic on dump or audit

[Andrew Rybchenko]

On 2/3/21 12:01 PM, Olivier Matz wrote:
> When doing a mempool dump or an audit, the application can panic because
> the length of the cache is greater than the flush threshold, which is
> seen as a fatal error. But this can temporarily happen when the mempool
> is in use.
> 
> Fix the panic condition to abort only when the cache length is greater
> than the array.
> 
> Fixes: ea5dd2744b90 ("mempool: cache optimisations")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>

Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

Re: [dpdk-stable] [dpdk-dev] [PATCH] mempool: fix invalid panic on dump or audit

[Thomas Monjalon]

04/02/2021 14:33, Andrew Rybchenko:
> On 2/3/21 12:01 PM, Olivier Matz wrote:
> > When doing a mempool dump or an audit, the application can panic because
> > the length of the cache is greater than the flush threshold, which is
> > seen as a fatal error. But this can temporarily happen when the mempool
> > is in use.
> > 
> > Fix the panic condition to abort only when the cache length is greater
> > than the array.
> > 
> > Fixes: ea5dd2744b90 ("mempool: cache optimisations")
> > Cc: stable@dpdk.org
> > 
> > Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
> 
> Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

Applied, thanks