[CPANEL-22645] Shells spawned via cPanel Terminal inherit memory limits from cpsrvd

seb.witt

• October 21, 2018 05:50

[COLOR=rgb(85, 85, 85)]Hello, our webhost directed us here since he was out of ideas as well, so let me try to sum up what is happening. If you need anything else, please let me know. So, the issue arises using composer from within cpanel terminal It not happens via whm terminal and using 'su user' to execute the command. But we need to have this available in cpanel The command in question, with any package composer require package/package --profile
I know this consumes a lot of memory. Once executed we get [123.2MB/8.52s] Using version ^2.1 for buzz/laravel-google-captcha [123.3MB/8.53s] ./composer.json has been updated [125.2MB/8.75s] Loading composer repositories with package information [125.4MB/9.11s] Updating dependencies (including require-dev) mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory Fatal error: Out of memory (allocated 591405056) (tried to allocate 4096 bytes) in phar:///opt/cpanel/composer/bin/composer/src/Composer/DependencyResolver/Solver.php on line 220
Looking at the top command while executing this, I see the memory jumps max up to 20%, but the cpu hits 100%, so I guess the process gets killed. What we tried - Shell fork bomb protection is off. Tried enabling and higher/lower the values, the error stays the same, always killed of at 591405056 - manually adding the values, same as fork bomb protection - Adjusting the pam values in /etc/security/limits.conf. Doesnt's seem to have any effect though - Higher the php memory limit, to no effect, setting to -1 with php -d memory_limit=-1 composer..... The php cli shouldn't have any limit to begin with if i'm not wrong though - Switching between all kind of mpm for apache with different php handlers and modules, all to no avail System info 1) Cpanel 74.0 (build 9) 2) CENTOS 7.5 virtuozzo 3) Kernel 2.6.32-042stab125.5 4) As you see we on openvz vps, with no swap for ram, host doesn't allow switching to vswap 5) 4gb ram ( 4 processors Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz ) 6) Apache mpm_event with php-fpm and currently for testing purpose without OPcache ulimit -a in whm core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 385882 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) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 385882 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
[COLOR=rgb(85, 85, 85)] ulimit -a in cpanel Adjusting this via /etc/profile not allows a higher limit than 786432 for memory core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 385882 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) 786432 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) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 385882 virtual memory (kbytes, -v) 786432 file locks (-x) unlimited
[COLOR=rgb(85, 85, 85)] [COLOR=rgb(85, 85, 85)]free -m [COLOR=rgb(85, 85, 85)] [COLOR=rgb(85, 85, 85)] total used free shared buff/cache available Mem: 4096 1167 902 133 2026 2783 Swap: 0 0 0
[COLOR=rgb(85, 85, 85)]ipcs -lm [COLOR=rgb(85, 85, 85)] [COLOR=rgb(85, 85, 85)]------ Shared Memory Limits -------- max number of segments = 4096 max seg size (kbytes) = 32768 max total shared memory (kbytes) = 8388608 min seg size (bytes) = 1
[COLOR=rgb(85, 85, 85)]Thank you, seb

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  seb.witt

  • October 21, 2018 10:53

  Sorry for some formatting issues, tried to edit, but it doesn't allow me due spam detection. Also forgot, php is PHP 7.2.11

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  seb.witt

  • October 23, 2018 16:48

  Can someone at least confirm if this an intended feature, or something undocumented? This only happens in the cpanel terminal and not your regular ssh client. ( tested on 2 different vps with different setups ) Also doesn't seem to be affected by the tweak settings Max cPanel process memory (Minimum: 768)

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  cPanelMichael

  • October 23, 2018 17:23

  Hello @seb.witt, Internal case CPANEL-22645 was opened to address an issue where cPanel >> Terminal inherit memory limits from cpsrvd. I'll monitor this case and update this thread once the solution is published. In the meantime, the temporary workaround is to access SSH via a third-party client (or the operating system's built-in client). Alternatively, you can temporarily increase the Max cPanel process memory value in WHM >> Tweak Settings. Thank you.

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  seb.witt

  • October 24, 2018 17:24

  Hello, thank you for confirming. [QUOTE]Alternatively, you can temporarily increase the Max cPanel process memory value in WHM >> Tweak Settings.
  That was tested as well, as mentioned in my previous post, even setting to unlimited did not work

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  cPanelMichael

  • October 25, 2018 21:17

  Hello, cPanel & WHM version 76.0.1 is now published to the EDGE and CURRENT release tiers. Included with this build is a solution to the issue reported on this thread: Fixed case CPANEL-22645: Fix memory limits for shells spawned within cPanel. The full change log is available

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