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Tue, 29 Sep 2026 09:29:23 -0700 (PDT) Received: from localhost ([153.61.198.251]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a497e90180sm7148752a91.2.2026.09.29.09.29.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Sep 2026 09:29:22 -0700 (PDT) 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) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260929_092924_722636_70ED653E X-CRM114-Status: UNSURE ( 8.97 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv