On Mon, Feb 11, 2019 at 7:39 AM Daniel Borkmann <dan...@iogearbox.net> wrote: > > On 02/10/2019 09:52 PM, Alexei Starovoitov wrote: > > Lockdep warns about false positive: > > [ 11.211460] ------------[ cut here ]------------ > > [ 11.211936] DEBUG_LOCKS_WARN_ON(depth <= 0) > > [ 11.211985] WARNING: CPU: 0 PID: 141 at ../kernel/locking/lockdep.c:3592 > > lock_release+0x1ad/0x280 > > [ 11.213134] Modules linked in: > > [ 11.214954] RIP: 0010:lock_release+0x1ad/0x280 > > [ 11.223508] Call Trace: > > [ 11.223705] <IRQ> > > [ 11.223874] ? __local_bh_enable+0x7a/0x80 > > [ 11.224199] up_read+0x1c/0xa0 > > [ 11.224446] do_up_read+0x12/0x20 > > [ 11.224713] irq_work_run_list+0x43/0x70 > > [ 11.225030] irq_work_run+0x26/0x50 > > [ 11.225310] smp_irq_work_interrupt+0x57/0x1f0 > > [ 11.225662] irq_work_interrupt+0xf/0x20 > > > > since rw_semaphore is released in a different task vs task that locked the > > sema. > > It is expected behavior. > > Fix the warning with up_read_non_owner() and rwsem_release() annotation. > > > > Fixes: bae77c5eb5b2 ("bpf: enable stackmap with build_id in nmi context") > > Signed-off-by: Alexei Starovoitov <a...@kernel.org> > > Applied, thanks!
Thanks everyone !