From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yb1-xb2a.google.com (mail-yb1-xb2a.google.com [IPv6:2607:f8b0:4864:20::b2a]) by sourceware.org (Postfix) with ESMTPS id C68DD3858D28 for ; Sat, 29 Jan 2022 21:07:00 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org C68DD3858D28 Received: by mail-yb1-xb2a.google.com with SMTP id c19so12231ybf.2 for ; Sat, 29 Jan 2022 13:07:00 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=U3dc3xqDLlTpC2E+9rOE/F5axFiCJUonmG/KQjDXwZ0=; b=SBtFomk71TydMhpK2J71xY+ySMIHy5k9dShhmqlQ9U9sncM3XTqjWogcanJKH+Khkn kGzxJm6NXZYdGFElKz4FWZviNAvscWPCXEt6r7cneyH658rLqEIkZ7m7DXBczF/w7i0B Tq00PcJb8kaMg0WLQGy6XUxaoNX5MX5AO2Y2LjcrddiOCuSUX8UMk5a8ejHAxa4Al7dy jVyBNRzFdpIO0wYaGrduW31aCmHzK88TKD80SgJGI9wqJHffBXNQqIa+s7jD/1qeU70q yB2td/qo0npgjs5V/NWi+pwswVVayXeJqbCwMqJkWqWHHNdDewkeUEVZIzkuU4/pa/hW snKA== X-Gm-Message-State: AOAM530hpnpPeWzJkElQoUQBkTZldThDq50olN6CwD1IWt06UvNK1It7 qzP6O2zsbYI6959V1Ep0zk5+Dtd4ML2dCBJR4jgQL/g7JF0Ptg== X-Google-Smtp-Source: ABdhPJwsHFOowFI71uk77bu4yu1OCDa0mZHuTMX6PJrsJxa/x+zhRVKNQoXRn0d9zL3p2ISMTvZD6GeHERES792aGTs= X-Received: by 2002:a25:7c3:: with SMTP id 186mr21870996ybh.235.1643490420350; Sat, 29 Jan 2022 13:07:00 -0800 (PST) MIME-Version: 1.0 From: Vasyl Vavrychuk Date: Sat, 29 Jan 2022 23:06:48 +0200 Message-ID: Subject: gdb switches to __sysvec_apic_timer_interrupt or __default_send_IPI_dest_field with KVM enabled To: qemu-discuss@nongnu.org, linux-kernel@vger.kernel.org, gdb@sourceware.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=0.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Jan 2022 21:07:02 -0000 Hello, I run Linux kernel under qemu-system-x86_64 via the "-kernel" option. Also, I added the "-s" option to accept the gdb connection. After Linux boot up I connect with gdb and set a breakpoint in some function, for example "device_del", does not matter really. The problem is if I also use "--enable-kvm", then after breakpoint triggered and sending "n" from gdb, it switches to __sysvec_apic_timer_interrupt (regs=0xffffc90000297de8) at arch/x86/kernel/apic/apic.c:1102 1102 trace_local_timer_entry(LOCAL_TIMER_VECTOR); or to __default_send_IPI_dest_field (mask=, vector=, dest=dest@entry=2048) at arch/x86/kernel/apic/ipi.c:161 161 cfg = __prepare_ICR2(mask); I am stepping over kernel code that does not perform any waiting or blocking. Everything works fine with "--enable-kvm" removed. Thanks, Vasyl