From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: Frozen dom0 xl commands Date: Wed, 10 Dec 2014 13:55:59 +0000 Message-ID: <1418219759.3505.56.camel@citrix.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Balbir Singh Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org On Wed, 2014-12-10 at 19:24 +0530, Balbir Singh wrote: > I've been facing an issue on my Ubuntu box (acting as dom0) with > xen-4.5 (HEAD). I am running dom0 3.13.0.19-generic (ubuntu). When I > try and xl command I see the command hangs, after a while I see the > guest kernel complain. I've tried a similar setup on another setup and > I see the same issue. Any clues on how to debug? > > FYI: xl dmesg does not show much. I've tried using the console > debugger, but not had much luck with it Is xenstored running? > > [ 484.442137] xl D 0000000000000000 0 4590 4122 0x00000004 > [ 484.442146] ffff88038cf87dd8 0000000000000202 ffff8800c458afe0 > ffff88038cf87fd8 > [ 484.442156] 0000000000014440 0000000000014440 ffff8800c458afe0 > ffffffff81fc0260 > [ 484.442164] ffff88038cf87e10 ffff8800c4130058 ffff8800c413004c > ffff8800c4130000 > [ 484.442172] Call Trace: > [ 484.442188] [] schedule+0x29/0x70 > [ 484.442198] [] read_reply+0x95/0x140 > [ 484.442210] [] ? prepare_to_wait_event+0x100/0x100 > [ 484.442218] [] xenbus_dev_request_and_reply+0x8c/0xb0 > [ 484.442226] [] xenbus_file_write+0x27e/0x540 > [ 484.442236] [] ? __sb_start_write+0x49/0xe0 > [ 484.442246] [] ? security_file_permission+0x23/0xa0 > [ 484.442253] [] vfs_write+0xb4/0x1f0 > [ 484.442261] [] SyS_write+0x49/0xa0 > [ 484.442269] [] tracesys+0xe1/0xe6 > [ 484.442276] INFO: task xl:4660 blocked for more than 120 seconds. > [ 484.442280] Tainted: PF O 3.13.0-19-generic #40-Ubuntu > [ 484.442283] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [ 484.442286] xl D 0000000000000000 0 4660 4646 0x00000004 > [ 484.442291] ffff88038dc41dc0 0000000000000202 ffff88038e2797f0 > ffff88038dc41fd8 > [ 484.442300] 0000000000014440 0000000000014440 ffff88038e2797f0 > ffffffff81fc0290 > [ 484.442308] ffffffff81fc0294 ffff88038e2797f0 00000000ffffffff > ffffffff81fc0298 > [ 484.442316] Call Trace: > [ 484.442325] [] schedule_preempt_disabled+0x29/0x70 > [ 484.442333] [] __mutex_lock_slowpath+0x135/0x1b0 > [ 484.442339] [] mutex_lock+0x1f/0x2f > [ 484.442347] [] xenbus_dev_request_and_reply+0x26/0xb0 > [ 484.442355] [] xenbus_file_write+0x27e/0x540 > [ 484.442364] [] ? __sb_start_write+0x49/0xe0 > [ 484.442371] [] ? security_file_permission+0x23/0xa0 > [ 484.442378] [] vfs_write+0xb4/0x1f0 > [ 484.442386] [] SyS_write+0x49/0xa0 > [ 484.442393] [] tracesys+0xe1/0xe6 > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel