Public bug reported:
Every once in a while, /usr/sbin/apt-cacher-ng is seems to get stuck in
a loop and takes up 100% of cpu.
root@magicbox:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 21.04
Release: 21.04
Codename: hirsute
root@magicbox:~# dpkg -l | grep apt-cacher
ii apt-cacher-ng 3.6.3-1
amd64 caching proxy server for
software repositories
root@magicbox:~# ps -P 1494
PID PSR TTY STAT TIME COMMAND
1494 2 ? Ssl 2674:27 /usr/sbin/apt-cacher-ng -c /etc/apt-cacher-ng
ForeGround=1
root@magicbox:~# top -p 1494
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1494 apt-cac+ 20 0 755256 10244 7392 S 100.0 0.1 2681:35
apt-cacher-ng
Seems one of the threads stuck in a select/pool loop:
x00007f8c9495309e in epoll_wait (epfd=3, events=0x55b8c69e4eb0, maxevents=32,
timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
Download failed: Function not implemented. Continuing without source file
./misc/../sysdeps/unix/sysv/linux/epoll_wait.c.
30 ../sysdeps/unix/sysv/linux/epoll_wait.c: No such file or directory.
(gdb) bt
#0 0x00007f8c9495309e in epoll_wait (epfd=3, events=0x55b8c69e4eb0,
maxevents=32, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1 0x00007f8c94ca8719 in ?? () from /lib/x86_64-linux-gnu/libevent-2.1.so.7
#2 0x00007f8c94c9e685 in event_base_loop () from
/lib/x86_64-linux-gnu/libevent-2.1.so.7
#3 0x00007f8c94d8455a in acng::evabase::MainLoop() () from
/lib/x86_64-linux-gnu/libsupacng.so
#4 0x000055b8c61f5b25 in ?? ()
#5 0x00007f8c94863565 in __libc_start_main (main=0x55b8c61f5af0, argc=4,
argv=0x7fff32802fc8, init=<optimised out>, fini=<optimised out>,
rtld_fini=<optimised out>, stack_end=0x7fff32802fb8) at ../csu/libc-start.c:332
#6 0x000055b8c61f5ede in ?? ()
(gdb) info threads
Id Target Id Frame
* 1 LWP 1494 "apt-cacher-ng" 0x00007f8c9495309e in epoll_wait (epfd=3,
events=0x55b8c69e4eb0, maxevents=32, timeout=-1) at
../sysdeps/unix/sysv/linux/epoll_wait.c:30
2 LWP 5052 "apt-cacher-ng" __futex_abstimed_wait_common64 (cancel=true,
private=0, abstime=0x0, clockid=0, expected=0, futex_word=0x7f8c94dae090) at
../sysdeps/nptl/futex-internal.c:74
3 LWP 11108 "apt-cacher-ng" __futex_abstimed_wait_common64 (cancel=true,
private=0, abstime=0x0, clockid=0, expected=0, futex_word=0x7f8c8802ba98) at
../sysdeps/nptl/futex-internal.c:74
4 LWP 18009 "apt-cacher-ng" __futex_abstimed_wait_common64 (cancel=true,
private=0, abstime=0x0, clockid=0, expected=0, futex_word=0x7f8c8802ba98) at
../sysdeps/nptl/futex-internal.c:74
5 LWP 18010 "apt-cacher-ng" __futex_abstimed_wait_common64 (cancel=true,
private=0, abstime=0x0, clockid=0, expected=0, futex_word=0x7f8c8802ba98) at
../sysdeps/nptl/futex-internal.c:74
6 LWP 18014 "apt-cacher-ng" __futex_abstimed_wait_common64 (cancel=true,
private=0, abstime=0x7f8c7bffeca0, clockid=1, expected=0,
futex_word=0x7f8c94dacd38) at ../sysdeps/nptl/futex-internal.c:74
7 LWP 19462 "apt-cacher-ng" 0x00007f8c94949b31 in __GI___select (nfds=15,
readfds=0x7f8c915daa00, writefds=0x7f8c915daa80, exceptfds=0x0,
timeout=<optimised out>) at ../sysdeps/unix/sysv/linux/select.c:49
8 LWP 21198 "apt-cacher-ng" __futex_abstimed_wait_common64 (cancel=true,
private=0, abstime=0x0, clockid=0, expected=0, futex_word=0x7f8c94dae090) at
../sysdeps/nptl/futex-internal.c:74
9 LWP 22284 "apt-cacher-ng" 0x00007f8c94949b31 in __GI___select (nfds=19,
readfds=0x7f8c7b7fda00, writefds=0x7f8c7b7fda80, exceptfds=0x0,
timeout=<optimised out>) at ../sysdeps/unix/sysv/linux/select.c:49
(gdb) thread 7
[Switching to thread 7 (LWP 19462)]
#0 0x00007f8c94949b31 in __GI___select (nfds=15, readfds=0x7f8c915daa00,
writefds=0x7f8c915daa80, exceptfds=0x0, timeout=<optimised out>) at
../sysdeps/unix/sysv/linux/select.c:49
Download failed: Function not implemented. Continuing without source file
./misc/../sysdeps/unix/sysv/linux/select.c.
49 ../sysdeps/unix/sysv/linux/select.c: No such file or directory.
(gdb) bt
#0 0x00007f8c94949b31 in __GI___select (nfds=15, readfds=0x7f8c915daa00,
writefds=0x7f8c915daa80, exceptfds=0x0, timeout=<optimised out>) at
../sysdeps/unix/sysv/linux/select.c:49
#1 0x00007f8c94d135f8 in
acng::dlcon::Impl::ExchangeData(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >&,
std::shared_ptr<acng::tcpconnect>&,
std::__cxx11::list<acng::dlcon::Impl::tDlJob,
std::allocator<acng::dlcon::Impl::tDlJob> >&) () from
/lib/x86_64-linux-gnu/libsupacng.so
#2 0x00007f8c94d15636 in acng::dlcon::Impl::WorkLoop() () from
/lib/x86_64-linux-gnu/libsupacng.so
#3 0x00007f8c94b1c694 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#4 0x00007f8c94c64450 in start_thread (arg=0x7f8c915db640) at
pthread_create.c:473
#5 0x00007f8c94952d53 in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
** Affects: apt-cacher-ng (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1942182
Title:
apt-cache-ng is taking 100% cpu
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