Memory leaks in xorg-server in Ubuntu 10.04.4 LTS.

[Igor]

Memory leaks in xorg-server while video chat is running in skype 4.

To reproduce:
1. Update to the current version of 10.04.4 (i386)
2. install Skype
3. run video chat.

Xorg will use all possible virtual memory in the system and OOM will kill skype.
Xorg will not release memory upon skype termination.

May be related to old bug https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/565981.
I have found that /sys/kernel/debug/dri/0/gem_objects reports negative number of "object bytes", looks like there is a leak in gem_objects as well.

So far leak happens only when Skype video is running.

This is degradation, possibly introduced by one of the latest updates.
Same configuration, with the same version of Skype, was running stable till I did scheduled update week ago. I perform an update every one-two months.

Description: Ubuntu 10.04.4 LTS
Release: 10.04

$ apt-cache policy xorg
xorg:
  Установлен: 1:7.5+5ubuntu1.1
  Кандидат: 1:7.5+5ubuntu1.1
  Таблица версий:
 *** 1:7.5+5ubuntu1.1 0
        500 http://mirror.rol.ru/ubuntu/ lucid-updates/main Packages
        500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
        100 /var/lib/dpkg/status
     1:7.5+5ubuntu1 0
        500 http://mirror.rol.ru/ubuntu/ lucid/main Packages

$ apt-cache policy skype
skype:
  Установлен: 4.0.0.8-0lucid1
  Кандидат: 4.0.0.8-0lucid1
  Таблица версий:
 *** 4.0.0.8-0lucid1 0
        500 http://archive.canonical.com/ubuntu/ lucid/partner Packages
        100 /var/lib/dpkg/status
revolver@monitor:~$
====================================================================

$ free
             total used free shared buffers cached
Mem: 1025892 991316 34576 0 2580 477120
-/+ buffers/cache: 511616 514276
Swap: 1646620 1632820 13800

====================================================================

$ top (sorted by %MEM)
top - 11:15:58 up 22:17, 2 users, load average: 0.77, 1.58, 0.84
Tasks: 131 total, 1 running, 126 sleeping, 0 stopped, 4 zombie
Cpu0 : 1.2%us, 0.6%sy, 0.0%ni, 98.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1025892k total, 991896k used, 33996k free, 2632k buffers
Swap: 1646620k total, 1632820k used, 13800k free, 477408k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  856 root 20 0 1372m 17m 2904 S 0.0 1.8 1:46.63 Xorg
 1236 valentin 20 0 47388 10m 8136 S 0.0 1.0 0:03.94 gnome-session
 1423 valentin 20 0 46692 10m 8164 S 0.3 1.0 0:00.75 polkit-gnome-au
 1414 valentin 9 -11 100m 7652 6640 S 0.0 0.7 2:07.67 pulseaudio
 1732 valentin 20 0 32268 7600 828 S 0.0 0.7 0:01.16 python
 1746 valentin 20 0 36372 3976 1608 S 0.0 0.4 0:00.07 evolution-excha
 1400 valentin 20 0 92092 3768 2628 S 0.0 0.4 0:08.87 gnome-settings-
 1743 valentin 20 0 69852 3572 1536 S 0.0 0.3 0:00.05 evolution-data-
 1420 root 20 0 8084 3316 2268 S 0.0 0.3 0:00.37 polkitd

====================================================================
OOM message:

[80035.784940] upowerd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0
[80035.784952] upowerd cpuset=/ mems_allowed=0
[80035.784963] Pid: 1435, comm: upowerd Not tainted 2.6.32-44-generic #98-Ubuntu
[80035.784971] Call Trace:
[80035.784992] [<c01ceec4>] oom_kill_process+0xa4/0x2b0
[80035.785005] [<c01cf539>] ? select_bad_process+0xa9/0xe0
[80035.785018] [<c01cf5c1>] __out_of_memory+0x51/0xa0
[80035.785029] [<c01cf668>] out_of_memory+0x58/0xb0
[80035.785042] [<c01d1f58>] __alloc_pages_slowpath+0x498/0x4b0
[80035.785057] [<c01d20aa>] __alloc_pages_nodemask+0x13a/0x170
[80035.785071] [<c01d466a>] __do_page_cache_readahead+0xea/0x200
[80035.785085] [<c01d47a6>] ra_submit+0x26/0x30
[80035.785096] [<c01cd93c>] filemap_fault+0x3dc/0x410
[80035.785110] [<c01e6ec0>] __do_fault+0x40/0x490
[80035.785122] [<c01e8b39>] handle_mm_fault+0x139/0x390
[80035.785138] [<c05941bd>] do_page_fault+0x10d/0x3a0
[80035.785151] [<c05940b0>] ? do_page_fault+0x0/0x3a0
[80035.785163] [<c05920b3>] error_code+0x73/0x80
[80035.785170] Mem-Info:
[80035.785176] DMA per-cpu:
[80035.785183] CPU 0: hi: 0, btch: 1 usd: 0
[80035.785189] Normal per-cpu:
[80035.785197] CPU 0: hi: 186, btch: 31 usd: 35
[80035.785203] HighMem per-cpu:
[80035.785210] CPU 0: hi: 42, btch: 7 usd: 36
[80035.785226] active_anon:56785 inactive_anon:84567 isolated_anon:0
[80035.785230] active_file:138 inactive_file:210 isolated_file:0
[80035.785234] unevictable:0 dirty:0 writeback:0 unstable:0
[80035.785238] free:3036 slab_reclaimable:2446 slab_unreclaimable:6442
[80035.785243] mapped:2219 shmem:110543 pagetables:1472 bounce:0
[80035.785267] DMA free:4056kB min:64kB low:80kB high:96kB active_anon:812kB inactive_anon:3336kB active_file:0kB inactive_file:16kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15852kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:3836kB slab_reclaimable:4kB slab_unreclaimable:4kB kernel_stack:0kB pagetables:8kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:32 all_unreclaimable? no
[80035.785287] lowmem_reserve[]: 0 865 999 999
[80035.785316] Normal free:7964kB min:3728kB low:4660kB high:5592kB active_anon:207532kB inactive_anon:239868kB active_file:292kB inactive_file:536kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:885944kB mlocked:0kB dirty:0kB writeback:0kB mapped:7936kB shmem:335216kB slab_reclaimable:9780kB slab_unreclaimable:25764kB kernel_stack:2032kB pagetables:4960kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:608 all_unreclaimable? no
[80035.785338] lowmem_reserve[]: 0 0 1074 1074
[80035.785366] HighMem free:124kB min:132kB low:276kB high:420kB active_anon:18796kB inactive_anon:95064kB active_file:260kB inactive_file:288kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:137548kB mlocked:0kB dirty:0kB writeback:0kB mapped:944kB shmem:103120kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:920kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:288 all_unreclaimable? no
[80035.785387] lowmem_reserve[]: 0 0 0 0
[80035.785399] DMA: 2*4kB 4*8kB 13*16kB 5*32kB 3*64kB 3*128kB 4*256kB 2*512kB 1*1024kB 0*2048kB 0*4096kB = 4056kB
[80035.785433] Normal: 173*4kB 173*8kB 30*16kB 11*32kB 13*64kB 1*128kB 2*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 7964kB
[80035.785466] HighMem: 9*4kB 3*8kB 0*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 124kB
[80035.785498] 111952 total pagecache pages
[80035.785504] 1033 pages in swap cache
[80035.785512] Swap cache stats: add 419229, delete 418196, find 2679/3427
[80035.785519] Free swap = 0kB
[80035.785525] Total swap = 1646620kB
[80035.796208] 261984 pages RAM
[80035.796214] 34658 pages HighMem
[80035.796220] 5607 pages reserved
[80035.796225] 5174 pages shared
[80035.796230] 250589 pages non-shared
[80035.796240] Out of memory: kill process 1702 (skype) score 894138 or a child
[80035.796252] Killed process 1703 (skype)

[Igor (xrevolver)]

An interesting observation:
memory leaks ONLY when skype remote user translates its video.

[Igor (xrevolver)]

I mean "turns on" his video

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[klmorgan (klm3030)]

I am having the same issue. When using skype after a minute or two memory usage starts climbing and then swap starts climbing, eventually memory gets to about 80% and swap goes to 100%, of course everything comes to a screeching halt and system locks up and sometimes crashes. ubuntu 10.4 with all updates, 3G RAM and 1.6G of swap. My other system with same OS and 2G of RAM and same version of skype (4.1.0.20) never has a problem.

[Vangelis Tasoulas (cyberang3l)]

Exactly same problem here when remote user turns on their video.

Any solution or workaround?

[Igor (xrevolver)]

No workaround, or solution AFAIK

[penalvch (penalvch)]

Igor, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg-server REPLACE-WITH-BUG-NUMBER

Please note, given that the information from the prior release is already available, doing this on a release prior to the development one would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Launchpad Janitor (janitor)]

[Expired for xorg-server (Ubuntu) because there has been no activity for 60 days.]