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If an abnormally huge cnt is used for multi-kprobes attachment, the
following warning will be reported:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 392 at mm/util.c:632 kvmalloc_node+0xd9/0xe0
Modules linked in: bpf_testmod(O)
CPU: 1 PID: 392 Comm: test_progs Tainted: G ...... 6.7.0-rc3+ #32
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
......
RIP: 0010:kvmalloc_node+0xd9/0xe0
? __warn+0x89/0x150
? kvmalloc_node+0xd9/0xe0
bpf_kprobe_multi_link_attach+0x87/0x670
__sys_bpf+0x2a28/0x2bc0
__x64_sys_bpf+0x1a/0x30
do_syscall_64+0x36/0xb0
entry_SYSCALL_64_after_hwframe+0x6e/0x76
RIP: 0033:0x7fbe067f0e0d
......
</TASK>
---[ end trace 0000000000000000 ]---
So add a test to ensure the warning is fixed.
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20231215100708.2265609-6-houtao@huaweicloud.com
1467affd16