| Summary: | systemd-journal consumes 100% cpu (lxc-container with getty.target) | ||
|---|---|---|---|
| Product: | systemd | Reporter: | Urs Helmig <urs> |
| Component: | general | Assignee: | systemd-bugs |
| Status: | RESOLVED NOTABUG | QA Contact: | systemd-bugs |
| Severity: | normal | ||
| Priority: | medium | ||
| Version: | unspecified | ||
| Hardware: | ARM | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
You are creating a log loop, journald reads kmsg, logs that to console, you loop that back to kmsg. YOu really should believe mounting /dev/console to kmsg was a good idea. THey are very different devices, /dev/kmsg isn't even a tty. Similar for /dev/tty1, you cannot just mount any pts there, since the VT api means you have a number of files in /sys/class/tty that match it, it means that you also have /dev/vcsa1, it means you can send a special set of ansi sequences to it, and it means that you can issue some special ioctls on it. Nothing of that is provided by simply mounting a pseudo tty on top, and logind will not work if you ignore that. Also see: http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/ |
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Problem -------------------- systemd-journal consumes 100% cpu only if the getty.target is started. The getty.target can be started for /dev/console or for /dev/tty1 (logical pts console) - no difference. Without getty.target and an installed sshd daemon, the system works fine. The strace is very simular to the strace in BUG 61191, but MaxRetentionSec in journald.conf is not set. System-Information: -------------------- - raspberry-pi arm board with arch-linux -> LXC-Container with fresh archlinux installation - no capabilities dropped - /dev/kmsg is symlinked to /dev/console - Linux 3.12.20-4-ARCH armv6l GNU/Linux - systemd 213 +PAM -AUDIT -SELINUX -IMA -SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ +SECCOMP -APPARMOR STRACE: -------------------- clock_gettime(CLOCK_REALTIME, {1402689055, 61457752}) = 0 clock_gettime(CLOCK_REALTIME, {1402689055, 62066735}) = 0 epoll_wait(7, {{EPOLLIN, {u32=3080684416, u64=3080684416}}, {EPOLLIN, {u32=3080684000, u64=3080684000}}, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=3080684624, u64=3080684624}}, {EPOLLIN, {u32=3080684208, u64=3080684208}}}, 12, 0) = 4 clock_gettime(CLOCK_REALTIME, {1402689055, 63220702}) = 0 clock_gettime(CLOCK_MONOTONIC, {347291, 774525484}) = 0 clock_gettime(0x7 /* CLOCK_??? */, {347291, 774947472}) = 0 writev(2, [{"/dev/kmsg buffer overrun, some m"..., 45}, {"\n", 1}], 2) = 46 read(9, "", 8192) = 0 clock_gettime(CLOCK_REALTIME, {1402689055, 65947625}) = 0 clock_gettime(CLOCK_REALTIME, {1402689055, 66394612}) = 0 epoll_wait(7, {{EPOLLIN, {u32=3080684416, u64=3080684416}}, {EPOLLIN, {u32=3080684000, u64=3080684000}}, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=3080684624, u64=3080684624}}, {EPOLLIN, {u32=3080684208, u64=3080684208}}}, 12, 0) = 4 clock_gettime(CLOCK_REALTIME, {1402689055, 67409583}) = 0 clock_gettime(CLOCK_MONOTONIC, {347291, 778714365}) = 0 clock_gettime(0x7 /* CLOCK_??? */, {347291, 779147353}) = 0 writev(2, [{"/dev/kmsg buffer overrun, some m"..., 45}, {"\n", 1}], 2) = 46 read(9, "", 8192) = 0 clock_gettime(CLOCK_REALTIME, {1402689055, 69843514}) = 0 clock_gettime(CLOCK_REALTIME, {1402689055, 70276502}) = 0