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| author | Alexei Starovoitov | 2019-02-10 12:52:35 -0800 |
|---|---|---|
| committer | Daniel Borkmann | 2019-02-11 16:36:24 +0100 |
| commit | 3defaf2f15b2bfd86c6664181ac009e91985f8ac (patch) | |
| tree | e14f5b1fb6e2fb4447518ad12b7ef38618e8f5a1 /CREDITS | |
| parent | e6762c8bcf982821935a2b1cb33cf8335d0eefae (diff) | |
bpf: fix lockdep false positive in stackmap
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 <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'CREDITS')
0 files changed, 0 insertions, 0 deletions