Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751221Ab0HQEMA (ORCPT ); Tue, 17 Aug 2010 00:12:00 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:49149 "EHLO sunset.davemloft.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750945Ab0HQEL7 (ORCPT ); Tue, 17 Aug 2010 00:11:59 -0400 Date: Mon, 16 Aug 2010 21:12:18 -0700 (PDT) Message-Id: <20100816.211218.189709876.davem@davemloft.net> To: linux-kernel@vger.kernel.org CC: torvalds@linux-foundation.org Subject: tasks getting stuck on mmap_sem? From: David Miller X-Mailer: Mew version 6.3 on Emacs 23.1 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1517 Lines: 29 I just started seeing this with current GIT, is it related to the page table locking shuffle of a few days ago? [21029.265646] INFO: task git:16643 blocked for more than 120 seconds. [21029.267054] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [21029.268412] git D 000000000072f804 0 16643 16273 0x210001101000080 [21029.269809] Call Trace: [21029.271062] [000000000072f778] rwsem_down_failed_common+0x90/0xb8 [21029.272390] [000000000072f804] __down_read+0x30/0x40 [21029.273689] [0000000000731148] do_sparc64_fault+0x238/0x788 [21029.274996] [00000000004079e8] sparc64_realfault_common+0x10/0x20 [21029.276347] INFO: task git:16644 blocked for more than 120 seconds. [21029.277655] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [21029.278993] git D 000000000072f874 0 16644 16273 0x210041101000080 [21029.280348] Call Trace: [21029.281542] [000000000072f778] rwsem_down_failed_common+0x90/0xb8 [21029.282818] [000000000072f874] __down_write+0x34/0x44 [21029.284057] [00000000004d9c44] SyS_mmap_pgoff+0xc8/0x118 [21029.285293] [0000000000406154] linux_sparc_syscall32+0x34/0x40 ... etc. it's a set of git threads computing deltas for a remote pull request to the machine. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/