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d="scan'208";a="6625096" From: Igor Druzhinin To: Date: Tue, 1 Oct 2019 20:15:57 +0100 Message-ID: <1569957357-20803-1-git-send-email-igor.druzhinin@citrix.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Subject: [Xen-devel] [PATCH for-4.13] x86/crash: force unlock console before printing on kexec crash X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: andrew.cooper3@citrix.com, Igor Druzhinin , wl@xen.org, jbeulich@suse.com, roger.pau@citrix.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) There is a small window where shootdown NMI might come to a CPU (e.g. in serial interrupt handler) where console lock is taken. In order not to leave following console prints waiting infinitely for shot down CPUs to free the lock - force unlock the console. The race has been frequently observed while crashing nested Xen in an HVM domain. Signed-off-by: Igor Druzhinin --- xen/arch/x86/crash.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/xen/arch/x86/crash.c b/xen/arch/x86/crash.c index 6e1d3d3..a20ec8a 100644 --- a/xen/arch/x86/crash.c +++ b/xen/arch/x86/crash.c @@ -29,6 +29,7 @@ #include #include #include +#include =20 static cpumask_t waiting_to_crash; static unsigned int crashing_cpu; @@ -155,6 +156,7 @@ static void nmi_shootdown_cpus(void) } =20 /* Leave a hint of how well we did trying to shoot down the other cpus= */ + console_force_unlock(); if ( cpumask_empty(&waiting_to_crash) ) printk("Shot down all CPUs\n"); else --=20 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel