Hello RT-list! I'm pleased to announce the 5.10.252-rt148 stable release.
This release is an RT-only update. All the changes here are specific to RT. You can get this release via the git tree at: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git branch: v5.10-rt Head SHA1: 226bc47dbb388ecf009cd2569e44b0c2c2125c7e Or to build 5.10.252-rt148 directly, the following patches should be applied: https://www.kernel.org/pub/linux/kernel/v5.x/linux-5.10.tar.xz https://www.kernel.org/pub/linux/kernel/v5.x/patch-5.10.252.xz https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patch-5.10.252-rt148.patch.xz Signing key fingerprint: 9354 0649 9972 8D31 D464 D140 F394 A423 F8E6 7C26 All keys used for the above files and repositories can be found on the following git repository: git://git.kernel.org/pub/scm/docs/kernel/pgpkeys.git Enjoy! Luis Changes from v5.10.252-rt147: --- Jiayuan Chen (1): ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT Luis Claudio R. Goncalves (1): Linux 5.10.252-rt148 --- localversion-rt | 2 +- net/ipv6/route.c | 13 ++++++++++++- 2 files changed, 13 insertions(+), 2 deletions(-) --- diff --git a/localversion-rt b/localversion-rt index d3fa072b6b43..857407b62668 100644 --- a/localversion-rt +++ b/localversion-rt @@ -1 +1 @@ --rt147 +-rt148 diff --git a/net/ipv6/route.c b/net/ipv6/route.c index b47f89600c2f..455f76f07e2e 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1419,7 +1419,18 @@ static struct rt6_info *rt6_make_pcpu_route(struct net *net, p = this_cpu_ptr(res->nh->rt6i_pcpu); prev = cmpxchg(p, NULL, pcpu_rt); - BUG_ON(prev); + if (unlikely(prev)) { + /* + * Another task on this CPU already installed a pcpu_rt. + * This can happen on PREEMPT_RT where preemption is possible. + * Free our allocation and return the existing one. + */ + WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPT_RT)); + + dst_dev_put(&pcpu_rt->dst); + dst_release(&pcpu_rt->dst); + return prev; + } if (res->f6i->fib6_destroying) { struct fib6_info *from;
