[Xen-devel] Frozen dom0 xl commands

[Balbir Singh <bsingharora@xxxxxxxxx>]

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

[  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]  [<ffffffff817154b9>] schedule+0x29/0x70
[  484.442198]  [<ffffffff81429c25>] read_reply+0x95/0x140
[  484.442210]  [<ffffffff810a9a50>] ? prepare_to_wait_event+0x100/0x100
[  484.442218]  [<ffffffff8142aa1c>] xenbus_dev_request_and_reply+0x8c/0xb0
[  484.442226]  [<ffffffff8142d1ae>] xenbus_file_write+0x27e/0x540
[  484.442236]  [<ffffffff811baea9>] ? __sb_start_write+0x49/0xe0
[  484.442246]  [<ffffffff812cf1c3>] ? security_file_permission+0x23/0xa0
[  484.442253]  [<ffffffff811b88c4>] vfs_write+0xb4/0x1f0
[  484.442261]  [<ffffffff811b92f9>] SyS_write+0x49/0xa0
[  484.442269]  [<ffffffff81721c7f>] 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]  [<ffffffff817159d9>] schedule_preempt_disabled+0x29/0x70
[  484.442333]  [<ffffffff81717845>] __mutex_lock_slowpath+0x135/0x1b0
[  484.442339]  [<ffffffff817178df>] mutex_lock+0x1f/0x2f
[  484.442347]  [<ffffffff8142a9b6>] xenbus_dev_request_and_reply+0x26/0xb0
[  484.442355]  [<ffffffff8142d1ae>] xenbus_file_write+0x27e/0x540
[  484.442364]  [<ffffffff811baea9>] ? __sb_start_write+0x49/0xe0
[  484.442371]  [<ffffffff812cf1c3>] ? security_file_permission+0x23/0xa0
[  484.442378]  [<ffffffff811b88c4>] vfs_write+0xb4/0x1f0
[  484.442386]  [<ffffffff811b92f9>] SyS_write+0x49/0xa0
[  484.442393]  [<ffffffff81721c7f>] tracesys+0xe1/0xe6

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