LXPanel freezes on Lubuntu 11.04

[amjjawad]

Hi,
thanks for answering. Well my panel is customized only regarding that i use one color (durchgehende barve-deckend) - middle option...
I use full install 32bit 11.04 on my both computers - shuttle xs35gtv2 and dell mini 9 with the same lxpanel setup. So, maybe the problem is that i use "only icons" option for open apps list, or maybe that i don not use system color.
And it is full frozen only lxpanel - menu icon, mail - nothing is working, but i can launch apps from cairo-dock.

Could you please re-attach the screenshot? I can't see anything clearly. Thanks!

[vickoxy]

In my browser everything is ok. I posted als one imageschack link.
It shows only how my lxpanel looks.

[GTRsdk]

Is there a difference between the panel being stuck and freezing?

On 11.04 and 11.10, I was unable to do anything with the panel while it was "frozen".

Here is a bug report: https://bugs.launchpad.net/ubuntu/+sour ... bug/800297


GTRsdk

[amjjawad]

Is there a difference between the panel being stuck and freezing?

On 11.04 and 11.10, I was unable to do anything with the panel while it was "frozen".

Yes but perhaps I didn't make myself clear

If the Menu got frozen, you can NOT do anything unless logout or reboot.
If the Menu got stuck, you still can do whatever you want but the Menu is stuck (opened).

I had the 2nd case when the menu got stuck. I already attached a screenshot and problem reported via mailing list to Lubuntu Team.

How it happens:
1- I click to open the menu
2- Make a selection from one of the category, say Graphics > Showwell
3- Program will be opened
4- Usually the menu should disappear after you make the selection but in my case it did not.
5- I have to click on the menu again until it disappears

It happened many times with Lubuntu 11.10 on two test PCs.

Here is a bug report: https://bugs.launchpad.net/ubuntu/+sour ... bug/800297

Will have a look

Thanks!

[amjjawad]

Hi,

It might be helpful so please have a look: http://ubuntuforums.org/showpost.php?p= ... tcount=416

[grin]

Hello, it's nice to revive such an old thread.

It freezes on Debian wheezy, too, and on sid as well. Quite often. All I can provide is some task states, maybe helps. Oh and the "cure" which works is:

Code: Select all

killall lxpanel && lxpanel --profile LXDE &

unless obviously you doesn't have an already opened xterm handy, in which case you're screwed (=restart x). Fortunately

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CTRL-ALT-LEFT/RIGH

usually works to change desktops.

So, it looks like this when frozen:

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stack:[<c102fa76>] enqueue_task_rt+0x1a6/0x1c5
stack:[<c102ac3d>] test_tsk_need_resched+0xa/0x13
stack:[<c102dc06>] resched_task+0x30/0x57
stack:[<c102ac3d>] test_tsk_need_resched+0xa/0x13
stack:[<c102e54a>] check_preempt_curr+0x48/0x58
stack:[<c107b514>] rcu_enter_nohz+0xc/0x55
stack:[<c103d00d>] irq_exit+0x5d/0x80
stack:[<c100cd96>] do_IRQ+0x65/0x76
stack:[<c12b971a>] work_resched+0x5/0x20
stack:[<c12b0000>] amd_64_threshold_cpu_callback+0xbb/0x22b
stack:[<ffffffff>] 0xffffffff
stat:26983 (lxpanel) R 1 26983 17542 0 -1 4202496 127554 249 273 1 103527 5501 0 0 20 0 1 0 151461212 170442752 3164 4294967295 134512640 134705020 3217543024 3217541708 3068874055 0 0 4096 0 0 0 0 17 0 0 0 817 0 0
statm:41612 3164 1781 47 0 1305 0
status:Name:    lxpanel
status:State:   R (running)
status:Tgid:    26983
status:Pid:     26983
status:PPid:    1
status:TracerPid:       0
status:Uid:     1000    1000    1000    1000
status:Gid:     1000    1000    1000    1000
status:FDSize:  256
status:Groups:  6 7 20 22 24 25 29 40 44 46 50 60 107 116 151 154 156 168 171 185 1000 1014 1019 1029 1030 
status:VmPeak:    167136 kB
status:VmSize:    166448 kB
status:VmLck:          0 kB
status:VmPin:          0 kB
status:VmHWM:      16628 kB
status:VmRSS:      12656 kB
status:VmData:      5084 kB
status:VmStk:        136 kB
status:VmExe:        188 kB
status:VmLib:      17720 kB
status:VmPTE:        308 kB
status:VmSwap:         0 kB
status:Threads: 1
status:SigQ:    6/64286
status:SigPnd:  0000000000000000
status:ShdPnd:  0000000000000000
status:SigBlk:  0000000000000000
status:SigIgn:  0000000000001000
status:SigCgt:  0000000180000000
status:CapInh:  0000000000000000
status:CapPrm:  0000000000000000
status:CapEff:  0000000000000000
status:CapBnd:  ffffffffffffffff
status:Cpus_allowed:    ffff
status:Cpus_allowed_list:       0-15
status:Mems_allowed:    1
status:Mems_allowed_list:       0
status:voluntary_ctxt_switches: 1685535
status:nonvoluntary_ctxt_switches:      78354

Or a different stack:

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stack:[<c12ba99e>] nmi_handle.isra.0+0x2f/0x4a
stack:[<c107b514>] rcu_enter_nohz+0xc/0x55
stack:[<c103d00d>] irq_exit+0x5d/0x80
stack:[<c100cd96>] do_IRQ+0x65/0x76
stack:[<c12b971a>] work_resched+0x5/0x20
stack:[<c12b0000>] amd_64_threshold_cpu_callback+0xbb/0x22b
stack:[<ffffffff>] 0xffffffff

CPU run at 100% (one core), and lxpanel is completely unresponsive (whatever I click the stack doesn't change).

[etisdale]

Is this issue reproducible in other distributions?

Hello. I believe I might have the same (or a similar) problem in Linux Mint 12 LXDE.

From time to time, my Desktop folder icons (the default "Home" and "Computer" icons) fail to open with a left-button double click. I also have a "Directory Menu" in my panel that similarly fails to respond to a left-button single click. At about this time, the widows start trailing when I move them. At least I can access the menu! In fact, the only way I can navigate my system graphically is to go to Menu > Accessories > File Manager.

It doesn't seem like this is a file manager (pcmanfm) problem since I can still use pcmanfm through the Menu > Accessories > File Manager. Maybe the display manager (LXDM) or window manager (Openbox)?

When my system starts this behavior, it get really, really slow. The only solution I have found to date is to restart my computer.

My LM12 LXDE is pretty much a stock installation (i.e., very little tweaking).

Edit: Just posted this issue in its own thread, because I think it might well be different: http://forum.lxde.org/viewtopic.php?f=8&t=31657