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q=dns/txt; s=s879706; t=1793312673; h=from : subject : to : message-id : date; bh=dyT+ihmZRHBjmheITrRDtgrZmMUouv6nHmymzXaKw9Y=; b=Q3r7EgAxwJSH/WkhF+acCEPmNU3FngUTsfmeUuZRVYJl+duDsT1IhpITE36crV2PyJUjh j3rZxqtRPO+gCLXrtKyXttJc5A9RHO6qDSJcM20GgpqdbptlpFoaTeKRD/2/PXOOYUkSoR1 t8HBNQhJf+GScVthyK24Pj2qRuV83f7rsWq6ayv99lOkHOq1vNRzWmcHwwWAQDip9wpIhrm ekMAEJqBifH+3at8UuYBhZtR2HsnDjHnNHFBaLUOce+wigntKhF+WEnSlsNCobdBVSlgqTY 8jO3DTRZL5b/kw68PyJp3nH9A6gTmTO2XFNmP4flI48xnuvZR2DTqdtIDeuA== Received: from [10.45.33.53] (helo=SmtpCorp) by smtpcorp.com with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94.2-S2G) (envelope-from ) id 1xMYXQ-gL4TgZ-AO; Thu, 29 Oct 2026 22:24:00 +0000 Received: from [10.195.244.224] (helo=sse-laptop.lan) by smtpcorp.com with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256:X25519) (Exim 4.100.1) (envelope-from ) id 1xMYXP-4o5NDgrmO6N-dUpy; Thu, 29 Oct 2026 22:23:59 +0000 From: Shang En Sim To: Alexei Starovoitov , Daniel Borkmann Cc: Shang En Sim , bpf@vger.kernel.org, netdev@vger.kernel.org, Mykyta Yatsenko Subject: Queue "bpf: Size backward jumps by the insns they jump over" for stable Date: Thu, 29 Oct 2026 17:23:38 -0500 Message-ID: <20261029222340.870378-1-sim@shangen.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261022-jit_size_fix-v2-0-4bee6921b218@meta.com> References: <20261022-jit_size_fix-v2-0-4bee6921b218@meta.com> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Smtpcorp-Track: SHGqxlBjM558.-LIfyv5PHE-Z.6nd95wHFKT0 Feedback-ID: 879706m:879706aL5FzMA:879706s0ZNmKxbwB X-Report-Abuse: Please forward a copy of this message, including all headers, to Hi, Could you queue this fix for stable? commit ebf0ab370bcdcd17f4faa204e1d2cc8e817ca6b1 bpf: Size backward jumps by the insns they jump over It fixes the x86 JIT stopping its sizing passes before jumps converge, which makes a valid program fail to load with -ENOTSUPP and "bpf_jit: fatal error". I reproduced the failure on 6.18.59 (CONFIG_BPF_JIT_ALWAYS_ON=y) with the selftest program from a938f51d3522: the load fails with errno 524 and "bpf_jit: fatal error" in dmesg, and the same program loads with the fix applied. Thanks, Shang En Sim