Re: [PATCH v2] xfrm: policy: Read seqcount outside of rcu-read side in xfrm_policy_lookup_bytype
From: Steffen Klassert <steffen.klassert@secunet.com>
Date: 2021-06-03 08:16:48
Also in:
linux-rt-users, lkml, stable
On Fri, May 28, 2021 at 06:44:37PM +0200, Ahmed S. Darwish wrote:
On Fri, May 28, 2021, Varad Gautam wrote:quoted
Thead 1 (xfrm_hash_resize) Thread 2 (xfrm_policy_lookup_bytype) rcu_read_lock(); mutex_lock(&hash_resize_mutex); read_seqcount_begin(&xfrm_policy_hash_generation); mutex_lock(&hash_resize_mutex); // block xfrm_bydst_resize(); synchronize_rcu(); // block <RCU stalls in xfrm_policy_lookup_bytype>...quoted
Fixes: 77cc278f7b20 ("xfrm: policy: Use sequence counters with associated lock") Signed-off-by: Varad Gautam <redacted>Acked-by: Ahmed S. Darwish <redacted>
Applied, thanks a lot!