bpf: add schedule points in percpu arrays management

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[ upstream commit 32fff239de ]

syszbot managed to trigger RCU detected stalls in
bpf_array_free_percpu()

It takes time to allocate a huge percpu map, but even more time to free
it.

Since we run in process context, use cond_resched() to yield cpu if
needed.

Fixes: a10423b87a ("bpf: introduce BPF_MAP_TYPE_PERCPU_ARRAY map")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eric Dumazet 2018-03-08 13:14:45 +01:00 • committed by Greg Kroah-Hartman

parent 03549a3476

commit e1760b3563

1 changed files with 4 additions and 1 deletions

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kernel/bpf/arraymap.c

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