BUG: spinlock recursion (sys_chdir, user_path_at, do_path_lookup ...)

Peter Zijlstra peterz at infradead.org
Thu Jan 13 06:17:47 EST 2011

> On Wed, 2011-01-12 at 23:52 +0100, Thomas Gleixner wrote:

> > @peterz: Why does lockdep ignore the lock recursion in that
> >          spin_lock_nested() call?

So after some hints on IRC on where to look:

<tglx>         spin_lock(&parent->d_lock);
<tglx>         spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
<tglx> if parent == dentry

That won't yell because you explicitly tell lockdep its ok, I know what
I'm doing.

Several lockdep annotations (including this one) allow you to annotate
real bugs away, hence you really need to be sure about things when you
make them.

More information about the linux-arm-kernel mailing list