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A BPF_PROG_TYPE_SYSCALL program is sleepable, but its bpf_timer callbacks run in a non-sleepable hrtimer softirq context. Add verifier cases that call bpf_sys_bpf() and bpf_sys_close() from timer callbacks. Without the syscall helper prototype annotations these programs load, so their failure expectations expose the bug. Also add successful controls that call each helper from the syscall program main body, ensuring that the intended sleepable use remains accepted. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20260903144433.1716731-11-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>