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[130.117.225.111]) by mx.google.com with ESMTPS id ffacd0b85a97d-485883b8e2asi32337888f8f.55.2026.09.08.14.33.02 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Sep 2026 14:33:02 -0700 (PDT) Received-SPF: pass (google.com: domain of eva.kurchatova@virtuozzo.com designates 130.117.225.111 as permitted sender) client-ip=130.117.225.111; Authentication-Results: mx.google.com; dkim=pass header.i=@virtuozzo.com header.s=relay header.b="punDOZ/1"; spf=pass (google.com: domain of eva.kurchatova@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=eva.kurchatova@virtuozzo.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=virtuozzo.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=MIME-Version:Message-ID:Date:Subject:From: Content-Type; bh=PWD7f/LZ8gfTRryY9jTJjhPAk+c4C+eQST1I75taPMY=; b=punDOZ/1dajx SF64wMcTef/O88LukL6Xk8nG8CbEhxQjb+auPo8VLWMRhrayGB/BhcFXP/aYPKAOiqoCWEHOF4pHP Nsj7MGVirfzxGE5f2hkuWNVKdmNtEw7HLuCjR22S6M7k+S2J9tnwv5ZulDcT8o+9mIcV3fS3+EOEK i2YpqiuXyxN2lJK7RCbHjDikh3kHqIy78Xx1ix4aZWCKDxQ1Ty2U/8PSpc88DF34yzAKRsxp0jCW9 1brCZJnDyGjMWJ9M6IJ9ZlA8fEmn1w+xKy0/dQ8Vs+04+4YWXEQacVJayEtR1sMkHnfh6QEQuK0XJ csiTZZDwu1g3cafUm2aZMQ==; Received: from ch-vpn.virtuozzo.com ([130.117.225.6] helo=LekKit-T14) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1x43OZ-002WiQ-2P; Tue, 08 Sep 2026 23:32:52 +0200 From: Eva Kurchatova To: khorenko@virtuozzo.com Date: Wed, 9 Sep 2026 00:32:59 +0300 Message-ID: <20260908213300.2677462-1-eva.kurchatova@virtuozzo.com> X-Mailer: git-send-email 2.55.0 MIME-Version: 1.0 X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH vz10] selftests: syscall_user_dispatch: keep the frame pointer in sud_benchmark X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org The SIGSYS handler returns by hand: it loads __NR_rt_sigreturn, runs leaveq to drop its frame, adjusts the stack and issues the syscall. leaveq restores the stack from the frame pointer, so the sequence only works in a function that has one. gcc omits the frame pointer from -O1 up, so the handler restores a stack that is not the signal frame and rt_sigreturn resumes at a bogus address: Caught sys_ff00 Segmentation fault Upstream never sees it, as the Makefile passes no -O and the default is -O0, but the tests here are built with the distribution optimisation flags. Measured: -O0 passes, -O1 and -O2 fault, and either of them with -fno-omit-frame-pointer passes. Ask for the frame pointer, which is what the assembly needs. sud_test is unaffected either way. https://virtuozzo.atlassian.net/browse/VSTOR-144593 Feature: fix selftests Signed-off-by: Eva Kurchatova --- tools/testing/selftests/syscall_user_dispatch/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/syscall_user_dispatch/Makefile b/tools/testing/selftests/syscall_user_dispatch/Makefile index 03c120270953..249d9ed30c5c 100644 --- a/tools/testing/selftests/syscall_user_dispatch/Makefile +++ b/tools/testing/selftests/syscall_user_dispatch/Makefile @@ -3,7 +3,7 @@ top_srcdir = ../../../.. INSTALL_HDR_PATH = $(top_srcdir)/usr LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/ -CFLAGS += -Wall -I$(LINUX_HDR_PATH) +CFLAGS += -Wall -fno-omit-frame-pointer -I$(LINUX_HDR_PATH) TEST_GEN_PROGS := sud_test sud_benchmark include ../lib.mk -- 2.55.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel