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[ Upstream commit4e2e6841ff] This reverts commit4a8f635a60. Althought get_pid_task() internally already calls rcu_read_lock() and rcu_read_unlock(), the find_vpid() was not. The documentation for find_vpid() clearly states: "Must be called with the tasklist_lock or rcu_read_lock() held." Add proper rcu_read_lock/unlock() to protect the find_vpid(). Fixes:4a8f635a60("bpf: remove unnecessary rcu_read_{lock,unlock}() in multi-uprobe attach logic") Reported-by: Xuewen Yan <xuewen.yan@unisoc.com> Signed-off-by: Di Shen <di.shen@unisoc.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20250520054943.5002-1-xuewen.yan@unisoc.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>