From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754421AbdCHUMi (ORCPT ); Wed, 8 Mar 2017 15:12:38 -0500 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:48854 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754389AbdCHUMe (ORCPT ); Wed, 8 Mar 2017 15:12:34 -0500 X-IronPort-AV: E=Sophos;i="5.36,265,1486396800"; d="scan'208";a="1674834" Authentication-Results: spf=pass (sender IP is 74.221.232.54) smtp.mailfrom=sandisk.com; vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=bestguesspass action=none header.from=sandisk.com; X-AuditID: ac1c2133-9afff7000000c960-f7-58c05c5ee3ba From: Bart Van Assche To: "tglx@linutronix.de" CC: "torvalds@linux-foundation.org" , "mingo@kernel.org" , "linux-kernel@vger.kernel.org" , "hpa@zytor.com" , "akpm@linux-foundation.org" Subject: Re: [GIT pull] CPU hotplug updates for 4.9 Thread-Topic: [GIT pull] 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linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id v28KChqe019659 On Wed, 2017-03-08 at 09:25 +0100, Thomas Gleixner wrote: > Before you proceed with bisecting, could you try Linus head first, > especially commit: > > fa3aa7a54fe6 ("jiffies: Revert bogus conversion of NSEC_PER_SEC to TICK_NSEC") > > which fixes: 93825f2ec736 ("jiffies: Reuse TICK_NSEC instead of NSEC_PER_JIFFY") Hello Thomas, Sorry but the cpuhp_issue_call() still occurs with Linus' latest tree (commit ec3b93ae0bf4 / Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip). This morning I discovered that the hang only occurs if I/O AT support is enabled in the BIOS. I had enabled I/O AT support in the BIOS on February 23rd. With I/O AT support enabled the following warning appears during boot: WARNING: CPU: 8 PID: 596 at drivers/dma/ioat/dca.c:342 ioat_dca_init+0x185/0x190 [ioatdma] ioatdma 0000:00:04.0: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA Call Trace: dump_stack+0x68/0x93 __warn+0xc6/0xe0 warn_slowpath_fmt_taint+0x42/0x50 ioat_dca_init+0x185/0x190 [ioatdma] ioat_pci_probe+0xc07/0xf90 [ioatdma] local_pci_probe+0x1f/0x60 pci_device_probe+0xd1/0x130 driver_probe_device+0x265/0x400 __driver_attach+0xde/0xe0 bus_for_each_dev+0x5d/0x90 driver_attach+0x19/0x20 bus_add_driver+0x16e/0x270 driver_register+0x5b/0xd0 __pci_register_driver+0x58/0x60 ioat_init_module+0x8c/0x1000 [ioatdma] do_one_initcall+0x3e/0x170 do_init_module+0x5a/0x1ed load_module+0x2339/0x2a40 SYSC_finit_module+0xbc/0xf0 SyS_finit_module+0x9/0x10 do_syscall_64+0x57/0x140 entry_SYSCALL64_slow_path+0x25/0x25 In contrast with previous tests this morning I have been able to reproduce this hang with kernel v4.10. So it's not a kernel v4.10 regression. But the hang did not occur in a test with kernel v4.9.7. I assume this means that the regression got introduced between the v4.9 and v4.10 kernels. Bart.