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Tue, 29 Sep 2026 09:29:22 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Tue, 29 Sep 2026 16:29:22 +0000 Message-Id: Subject: Re: [PATCH bpf-next 3/5] selftests/bpf: Use /tmp for temporary file in d_path From: "Alexei Starovoitov" To: "Pu Lehui" , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= , , , Cc: "Daniel Borkmann" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" , "Martin KaFai Lau" , "Song Liu" , "Yonghong Song" , "Jiri Olsa" , "Emil Tsalapatis" , "Ihor Solodrai" , "Puranjay Mohan" , "Paul Walmsley" , "Palmer Dabbelt" , "Alexandre Ghiti" , "Pu Lehui" In-Reply-To: <20260929083924.1851840-4-pulehui@huaweicloud.com> References: <20260929083924.1851840-1-pulehui@huaweicloud.com> <20260929083924.1851840-4-pulehui@huaweicloud.com> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, Sep 29, 2026 at 08:39 AM Pu Lehui wrote: > The failure occurs because the rootfs created by libbpf/ci [0] does not > mount /dev/shm, causing temporary file creation under /dev/shm to fail. > > Let's switch to using /tmp instead to fix this issue. This will break BPF CI. The test was using /tmp up to v4 and was moved to /dev/shm in v5, since /tmp is on 9p in BPF CI and 9p doesn't support fallocate. See https://lore.kernel.org/all/20251206141210.3148-1-electronlsr@gmail.com/ vmtest's init mounts tmpfs at /dev/shm, /run and /mnt, but not at /tmp. So fallocate() will return EOPNOTSUPP and d_path/check_mem_access will fail on x86, arm64 and s390. Mount tmpfs at /dev/shm in mkrootfs_tweak.sh like you did for /tmp in [1] and drop this patch. pw-bot: cr