[Bug 1991235] Re: systemd 237-3ubuntu10.56 times out on getpwuid

[Launchpad Bug Tracker]

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

** Changed in: systemd (Ubuntu)
       Status: Incomplete => Expired

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1991235

Title:
  systemd 237-3ubuntu10.56 times out on getpwuid

Status in systemd package in Ubuntu:
  Expired

Bug description:
  We've recently upgraded packages on one of our images from systemd
  237-3ubuntu10.53 to 237-3ubuntu10.56 and are experiencing some
  performance issues. A kernel upgrade also happened (4.15.0.192.177 ->
  4.15.0.193.178) but I thought I'd check here first. Sorry if I'm
  raising this in the wrong place!

  Various operations are very slow:
  * logging in via SSH
  * ps auxf
  * top
  * systemctl
  * + more

  Weirdly, the issue seems to only happen on Amazon EC2 imported
  machines, and not when running under ESXi, although this may be a red
  herring.

  strace-ing ps shows a timeout reading from some kind of DBus socket:

  recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="/org/freedesktop/DBus\0\0\0\2\1s\0\24\0\0\0"..., iov_len=146}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 146
   > /lib/x86_64-linux-gnu/libc-2.27.so(recvmsg+0x14) [0x122934]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2(_nss_systemd_getpwnam_r+0xf257) [0x21df7]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2() [0x10fd1]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2(_nss_systemd_getpwuid_r+0x377) [0x12b27]
   > /lib/x86_64-linux-gnu/libc-2.27.so(getpwuid_r+0x145) [0xe39e5]
   > /lib/x86_64-linux-gnu/libc-2.27.so(getpwuid+0x98) [0xe3148]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(pwcache_get_user+0x5c) [0x5bfc]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(pwcache_get_user+0x1ebb) [0x7a5b]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(readproc+0x149) [0x8659]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(readproctab2+0x8a) [0x912a]
   > /bin/ps(_init+0xe3b) [0xaef3]
   > /lib/x86_64-linux-gnu/libc-2.27.so(__libc_start_main+0xe7) [0x21c87]
   > /bin/ps(_init+0x1322) [0xb3da]
  recvmsg(6, {msg_namelen=0}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
   > /lib/x86_64-linux-gnu/libc-2.27.so(recvmsg+0x14) [0x122934]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2(_nss_systemd_getpwnam_r+0xf257) [0x21df7]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2() [0x10fd1]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2(_nss_systemd_getpwuid_r+0x377) [0x12b27]
   > /lib/x86_64-linux-gnu/libc-2.27.so(getpwuid_r+0x145) [0xe39e5]
   > /lib/x86_64-linux-gnu/libc-2.27.so(getpwuid+0x98) [0xe3148]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(pwcache_get_user+0x5c) [0x5bfc]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(pwcache_get_user+0x1ebb) [0x7a5b]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(readproc+0x149) [0x8659]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(readproctab2+0x8a) [0x912a]
   > /bin/ps(_init+0xe3b) [0xaef3]
   > /lib/x86_64-linux-gnu/libc-2.27.so(__libc_start_main+0xe7) [0x21c87]
   > /bin/ps(_init+0x1322) [0xb3da]
  ppoll([{fd=6, events=POLLIN}], 1, {tv_sec=24, tv_nsec=995725000}, NULL, 8) = 0 (Timeout) <----
   > /lib/x86_64-linux-gnu/libc-2.27.so(ppoll+0x4a) [0x114c5a]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2(_nss_systemd_getpwnam_r+0x1795f) [0x2a4ff]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2() [0x1100a]
   > /lib/x86_64-linux-gnu/libnss_systemd.so.2(_nss_systemd_getpwuid_r+0x377) [0x12b27]
   > /lib/x86_64-linux-gnu/libc-2.27.so(getpwuid_r+0x145) [0xe39e5]
   > /lib/x86_64-linux-gnu/libc-2.27.so(getpwuid+0x98) [0xe3148]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(pwcache_get_user+0x5c) [0x5bfc]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(pwcache_get_user+0x1ebb) [0x7a5b]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(readproc+0x149) [0x8659]
   > /lib/x86_64-linux-gnu/libprocps.so.6.0.0(readproctab2+0x8a) [0x912a]
   > /bin/ps(_init+0xe3b) [0xaef3]
   > /lib/x86_64-linux-gnu/libc-2.27.so(__libc_start_main+0xe7) [0x21c87]
   > /bin/ps(_init+0x1322) [0xb3da]


  LSB release output:

  Description:    Ubuntu 18.04.6 LTS
  Release:        18.04

  Unfortunately I'm unsure how to investigate this further.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1991235/+subscriptions