Artem SavkovandSasha Levin 308e65ed60 selftests/bpf: Fix potential premature unload in bpf_testmod ...

[ Upstream commit d177c1be06 ]

It is possible for bpf_kfunc_call_test_release() to be called from
bpf_map_free_deferred() when bpf_testmod is already unloaded and
perf_test_stuct.cnt which it tries to decrease is no longer in memory.
This patch tries to fix the issue by waiting for all references to be
dropped in bpf_testmod_exit().

The issue can be triggered by running 'test_progs -t map_kptr' in 6.5,
but is obscured in 6.6 by d119357d07 ("rcu-tasks: Treat only
synchronous grace periods urgently").

Fixes: 65eb006d85 ("bpf: Move kernel test kfuncs to bpf_testmod")
Signed-off-by: Artem Savkov <asavkov@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/82f55c0e-0ec8-4fe1-8d8c-b1de07558ad9@linux.dev
Link: https://lore.kernel.org/bpf/20240110085737.8895-1-asavkov@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-03-26 18:19:22 -04:00

..

.gitignore

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bpf_testmod_kfunc.h

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bpf_testmod-events.h

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bpf_testmod.c

selftests/bpf: Fix potential premature unload in bpf_testmod

2024-03-26 18:19:22 -04:00

bpf_testmod.h

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Makefile

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