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| author | Eric Dumazet | 2018-02-22 17:33:24 +0100 |
|---|---|---|
| committer | Daniel Borkmann | 2018-02-22 21:27:06 +0100 |
| commit | 32fff239de37ef226d5b66329dd133f64d63b22d (patch) | |
| tree | 35ee0de8ea4ebaea6511622d12bbe177f5ed45e1 /tools | |
| parent | selftests/bpf/test_maps: exit child process without error in ENOMEM case (diff) | |
| download | kernel-qcow2-linux-32fff239de37ef226d5b66329dd133f64d63b22d.tar.gz kernel-qcow2-linux-32fff239de37ef226d5b66329dd133f64d63b22d.tar.xz kernel-qcow2-linux-32fff239de37ef226d5b66329dd133f64d63b22d.zip | |
bpf: add schedule points in percpu arrays management
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: a10423b87a7e ("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>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions