Public bug reported:
Hello RT-list!
I'm pleased to announce the 5.15.201-rt93 stable release.
This release contains a single new patch, which is an RT specific
commit:
1adaea51c61b ("ipv6: fix a BUG in rt6_get_pcpu_route() under
PREEMPT_RT")
New patch name:
0183-ipv6-fix-a-BUG-in-rt6_get_pcpu_route-under-PREEMPT_R.patch
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: v5.15-rt
Head SHA1: 3bd063531b598d0de0083b820901df5319a71769
Or to build 5.15.201-rt93 directly, the following patches should be
applied:
https://www.kernel.org/pub/linux/kernel/projects/rt/5.15
https://www.kernel.org/pub/linux/kernel/v5.x/linux-5.15.tar.xz
https://www.kernel.org/pub/linux/kernel/v5.x/patch-5.15.201.xz
https://www.kernel.org/pub/linux/kernel/projects/rt/5.15/patch-5.15.201-rt93.patch.xz
Enjoy!
Joseph Salisbury
Changes from v5.15.201-rt92:
---
Jiayuan Chen (1):
ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT
Joseph Salisbury (1):
Linux 5.15.201-rt93
---
localversion-rt | 2 +-
net/ipv6/route.c | 13 ++++++++++++-
2 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/localversion-rt b/localversion-rt
index 4905d52a48284..e98a1fe050bde 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt92
+-rt93
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f30a5b7d93f4d..3536192438cea 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1424,7 +1424,18 @@ 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;
** Affects: ubuntu-realtime
Importance: Undecided
Status: New
** Affects: linux-realtime (Ubuntu)
Importance: Undecided
Assignee: Benjamin Wheeler (benjaminwheeler)
Status: In Progress
** Affects: linux-realtime (Ubuntu Jammy)
Importance: Undecided
Assignee: Benjamin Wheeler (benjaminwheeler)
Status: In Progress
** Also affects: linux-realtime (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-realtime (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux-realtime (Ubuntu Jammy)
Assignee: (unassigned) => Benjamin Wheeler (benjaminwheeler)
** Changed in: linux-realtime (Ubuntu)
Assignee: (unassigned) => Benjamin Wheeler (benjaminwheeler)
** Changed in: linux-realtime (Ubuntu)
Status: New => In Progress
** Changed in: linux-realtime (Ubuntu Jammy)
Status: New => In Progress
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2146026
Title:
Jammy real-time patch set update: v5.15.201-rt93
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