apport information ** Attachment added: "UdevLog.txt" https://bugs.launchpad.net/bugs/1308474/+attachment/4085346/+files/UdevLog.txt
** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1308474 Title: CPU-intensive processes killed by OS Status in “linux” package in Ubuntu: Confirmed Bug description: When testing some algorithm I ran the test program several times with different parameters. It was to be expected that each run takes about four hours, and to utilize the capacities of my computer (4 CPUs) I started the program 4 times running in parallel and with lowered priority (the latter to be able to do meanwhile something else on the computer). All four processes ran in parallel for a few minutes but then two of them were killed with the error message: Command terminated by signal 9 [1] Exit 137 /usr/bin/time -f '%U+%S sec, avg %Kk max %Mk memory, major %F minor %R faults, %I+%O i/o' ./testu01long -d9689 -b3 > cat9689.tub Here, "/usr/bin/time ..." is the command I launched for the first process, the second error message was quite similar, now for the second process. The process started first ran about 6 minutes, the second about 14 minutes, so the TERM signals have been issued at different times (the processes had been started within one minute). The two other processes continued without problems. The point is that I did NOT issue a TERM signal to the processes, I conclude that the OS issued the TERM signals. The effect can be repeated to some extend: if another CPU-intensive process is started (e.g. a lengthy compilation) then an already running CPU-intensive process may be killed, if so then the one first started. When the killed program had been relaunched with the same parameters but without concurrency of other CPU-intensive processes (e.g. only editing, reading e-mails running in parallel) then all things were fine, so the kill is really not caused by the program. The program does not use external devices and even no I/O except for writing a summary to stdout at program end (i.e. not when the processes were killed). The question is, why have the processes been killed? Is the OS unable to manage as many running processes? I consider this a bug in the OS, part process management. The bug implies that the computer can be used for light weight tasks only. With regards Dr. Wolfgang Jansen PS: Additional platform info (commands "ulimit -a", "top" when two CPU-intensive processes were still running): core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 30092 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 30092 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited ----------------------------------------------- Tasks: 244 total, 3 running, 241 sleeping, 0 stopped, 0 zombie %Cpu(s): 15.5 us, 1.2 sy, 27.5 ni, 54.6 id, 1.2 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 3930376 total, 2263872 used, 1666504 free, 36756 buffers KiB Swap: 9212 total, 9212 used, 0 free, 705612 cached PID USER PR NI VIRT RES SHR S P %CPU %MEM TIME COMMAND 18804 wolfgang 30 10 14632 960 648 R 1 103.0 0.0 95:09 testu01long 18817 wolfgang 30 10 14632 960 648 R 0 103.0 0.0 94:03 testu01long 2491 root 20 0 444m 128m 103m S 2 6.4 3.3 7:04 Xorg 2945 wolfgang 20 0 1950m 205m 11m S 2 6.4 5.4 13:08 cinnamon 1 root 20 0 27336 1536 0 S 1 0.0 0.0 0:01 init 2 root 20 0 0 0 0 S 3 0.0 0.0 0:00 kthreadd 3 root 20 0 0 0 0 S 0 0.0 0.0 0:00 ksoftirqd/0 5 root 0 -20 0 0 0 S 0 0.0 0.0 0:00 kworker/0:0H 7 root rt 0 0 0 0 S 0 0.0 0.0 0:00 migration/0 8 root 20 0 0 0 0 S 0 0.0 0.0 0:00 rcu_bh 9 root 20 0 0 0 0 S 0 0.0 0.0 0:00 rcuob/0 10 root 20 0 0 0 0 S 0 0.0 0.0 0:00 rcuob/1 11 root 20 0 0 0 0 S 0 0.0 0.0 0:00 rcuob/2 12 root 20 0 0 0 0 S 0 0.0 0.0 0:00 rcuob/3 13 root 20 0 0 0 0 S 3 0.0 0.0 0:27 rcu_sched 14 root 20 0 0 0 0 S 3 0.0 0.0 0:06 rcuos/0 15 root 20 0 0 0 0 S 1 0.0 0.0 0:07 rcuos/1 Remark: The critical figure seems to be the swap space. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-3.11.0-19-generic 3.11.0-19.33 ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5 Uname: Linux 3.11.0-19-generic x86_64 ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: wolfgang 2911 F.... pulseaudio /dev/snd/controlC0: wolfgang 2911 F.... pulseaudio CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied Date: Wed Apr 16 11:35:44 2014 InstallationDate: Installed on 2014-03-20 (26 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: Acer Aspire XC600 MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-19-generic root=UUID=10374065-1d70-4588-aca9-25093062a44a ro quiet splash vt.handoff=7 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to saucy on 2014-03-21 (25 days ago) WifiSyslog: dmi.bios.date: 11/02/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P11-A3 dmi.board.name: Aspire XC600 dmi.board.vendor: Acer dmi.board.version: v1.0 dmi.chassis.type: 3 dmi.chassis.vendor: Acer dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP11-A3:bd11/02/2012:svnAcer:pnAspireXC600:pvr:rvnAcer:rnAspireXC600:rvrv1.0:cvnAcer:ct3:cvr: dmi.product.name: Aspire XC600 dmi.sys.vendor: Acer --- ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: wolfgang 2911 F.... pulseaudio /dev/snd/controlC0: wolfgang 2911 F.... pulseaudio CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied dmesg: write failed: Broken pipe DistroRelease: Ubuntu 13.10 InstallationDate: Installed on 2014-03-20 (26 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: Acer Aspire XC600 MarkForUpload: True Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-19-generic root=UUID=10374065-1d70-4588-aca9-25093062a44a ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5 RfKill: Tags: saucy Uname: Linux 3.11.0-19-generic x86_64 UpgradeStatus: Upgraded to saucy on 2014-03-21 (25 days ago) UserGroups: users WifiSyslog: dmi.bios.date: 11/02/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P11-A3 dmi.board.name: Aspire XC600 dmi.board.vendor: Acer dmi.board.version: v1.0 dmi.chassis.type: 3 dmi.chassis.vendor: Acer dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP11-A3:bd11/02/2012:svnAcer:pnAspireXC600:pvr:rvnAcer:rnAspireXC600:rvrv1.0:cvnAcer:ct3:cvr: dmi.product.name: Aspire XC600 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1308474/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp