Package: systemd
Version: 229-3
Severity: normal
Tags: upstream
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Hi,
Whilst debugging why Chrome would regularly fail to create new
threads[1] and zsh couldn’t fork I noticed that:
- - All affected processes run in the /system.slice/xdm.service cgroup
- - “systemctl status xdm.service” says “Tasks: 476 (limit: 512)”
- - The changelog for systemd 228 reads[2]:
There's a new system.conf setting DefaultTasksMax= to control
the default TasksMax= setting for services and scopes running on
the system.
[…]
The setting now defaults to 512, which means services that are
not explicitly configured otherwise will only be able to create
512 processes or threads at maximum, from this version on.
- - Nothing in xdm’s PAM configuration would load pam_systemd for creating
a session.
I’m not sure whether using pam_systemd would actually fix that; but
even then I find this new limit per cgroup at least surprising and
it apparently breaks a lot of software.
Sebastian
1: https://crbug.com/602002
2:
https://github.com/systemd/systemd/blob/ccddd104fc95e0e769142af6e1fe1edec5be70a6/NEWS#L373-393
- -- Package-specific info:
- -- System Information:
Debian Release: stretch/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1,
'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.6.0-rc5-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages systemd depends on:
ii adduser 3.114
ii libacl1 2.2.52-3
ii libapparmor1 2.10-3+b1
ii libaudit1 1:2.4.5-1+b1
ii libblkid1 2.27.1-6
ii libc6 2.22-4
ii libcap2 1:2.24-12
ii libcap2-bin 1:2.24-12
ii libcryptsetup4 2:1.7.0-2
ii libgcrypt20 1.6.5-2
ii libgpg-error0 1.21-2
ii libkmod2 22-1
ii liblzma5 5.1.1alpha+20120614-2.1
ii libmount1 2.27.1-6
ii libpam0g 1.1.8-3.2
ii libseccomp2 2.2.3-3
ii libselinux1 2.4-3+b1
ii libsystemd0 229-3
ii mount 2.27.1-6
ii util-linux 2.27.1-6
Versions of packages systemd recommends:
ii dbus 1.10.8-1
ii libpam-systemd 229-3
Versions of packages systemd suggests:
pn systemd-container <none>
pn systemd-ui <none>
Versions of packages systemd is related to:
ii udev 229-3
- -- Configuration Files:
/etc/systemd/logind.conf changed [not included]
/etc/systemd/system.conf changed [not included]
- -- no debconf information
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