c4ef2f3256
Added one test, send_signal_sched_switch, to test bpf_send_signal()
helper triggered by sched/sched_switch tracepoint. This test can be used
to verify kernel deadlocks fixed by the previous commit. The test itself
is heavily borrowed from Commit eac9153f2b ("bpf/stackmap: Fix deadlock
with rq_lock in bpf_get_stack()").
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200304191105.2796601-1-yhs@fb.com
47 lines
887 B
C
47 lines
887 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <linux/bpf.h>
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#include <linux/version.h>
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#include <bpf/bpf_helpers.h>
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__u32 sig = 0, pid = 0, status = 0, signal_thread = 0;
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static __always_inline int bpf_send_signal_test(void *ctx)
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{
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int ret;
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if (status != 0 || sig == 0 || pid == 0)
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return 0;
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if ((bpf_get_current_pid_tgid() >> 32) == pid) {
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if (signal_thread)
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ret = bpf_send_signal_thread(sig);
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else
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ret = bpf_send_signal(sig);
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if (ret == 0)
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status = 1;
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}
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return 0;
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}
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SEC("tracepoint/syscalls/sys_enter_nanosleep")
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int send_signal_tp(void *ctx)
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{
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return bpf_send_signal_test(ctx);
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}
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SEC("tracepoint/sched/sched_switch")
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int send_signal_tp_sched(void *ctx)
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{
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return bpf_send_signal_test(ctx);
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}
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SEC("perf_event")
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int send_signal_perf(void *ctx)
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{
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return bpf_send_signal_test(ctx);
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}
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char __license[] SEC("license") = "GPL";
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