summaryrefslogtreecommitdiff
path: root/kernel/locking/lockdep.c
diff options
context:
space:
mode:
authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2022-09-19 09:52:13 +0900
committerIngo Molnar <mingo@kernel.org>2022-09-21 09:58:21 +0200
commit76e64c73db9542ff4bae8a60f4f32e38f3799b95 (patch)
treeb74b3d1d43b96cec54327b402aeccb3a923cfce3 /kernel/locking/lockdep.c
parent74656d03ac36fabb16b9df5221cf398ee3a9ca08 (diff)
locking/lockdep: Print more debug information - report name and key when look_up_lock_class() got confused
Printing this information will be helpful: ------------[ cut here ]------------ Looking for class "l2tp_sock" with key l2tp_socket_class, but found a different class "slock-AF_INET6" with the same key WARNING: CPU: 1 PID: 14195 at kernel/locking/lockdep.c:940 look_up_lock_class+0xcc/0x140 Modules linked in: CPU: 1 PID: 14195 Comm: a.out Not tainted 6.0.0-rc6-dirty #863 Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 RIP: 0010:look_up_lock_class+0xcc/0x140 Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/bd99391e-f787-efe9-5ec6-3c6dc4c587b0@I-love.SAKURA.ne.jp
Diffstat (limited to 'kernel/locking/lockdep.c')
-rw-r--r--kernel/locking/lockdep.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 64a13eb56078..e3375bc40dad 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -934,8 +934,10 @@ look_up_lock_class(const struct lockdep_map *lock, unsigned int subclass)
* Huh! same key, different name? Did someone trample
* on some memory? We're most confused.
*/
- WARN_ON_ONCE(class->name != lock->name &&
- lock->key != &__lockdep_no_validate__);
+ WARN_ONCE(class->name != lock->name &&
+ lock->key != &__lockdep_no_validate__,
+ "Looking for class \"%s\" with key %ps, but found a different class \"%s\" with the same key\n",
+ lock->name, lock->key, class->name);
return class;
}
}