bug#28149: 26.0.50; Emacs regularly hangs for multiple seconds in e.g. find-file

[Alexander Asteroth <alexander.asteroth@h-brs.de>]

Dear all,

my emacs hangs pretty often anf for 10 secs. ca. when I am prompted for
e.g. a file in find-file, or an interactive function in M-x or a
shell-command in read-shell-command. It seems to happen only, in these
cases, when there is an option to auto-complete. It appears particularly
often right after emacs was started (and even multiple times). After
emacs runs for hours or even days the problem is very rare.

I tried stracing my emacs (wich is a little problematic, since it is
also my window manager) and killing the strace/emacs/exwm right after
the hanging happens it always appeared right after a strace fragment
like this:

     0.000733 recvmsg(6, 0x7ffdfdb31430, 0) = -1 EAGAIN (Resource temporarily unavailable)
     0.000273 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000230 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000435 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000202 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000288 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000177 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000390 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000159 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000199 recvmsg(6, 0x7ffdfdb31430, 0) = -1 EAGAIN (Resource temporarily unavailable)
     0.000158 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000148 recvmsg(6, 0x7ffdfdb31650, 0) = -1 EAGAIN (Resource temporarily unavailable)
     0.000086 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=10, events=POLLIN}], 3, 0) = 0 (Timeout)
     0.000117 pselect6(15, [4 6 7 10 12 13 14], [], NULL, {1, 911848155}, {NULL, 8}) = 1 (in [4], left {1, 4014190})
     0.908089 read(4, "\1\0\0\0\0\0\0\0", 8) = 8
     0.000229 pselect6(15, [4 6 7 10 12 13 14], [], NULL, {1, 3617217},     {NULL, 8}

I suspected the read(4, ....) call since it always appears near the end,
but then tried also stracing emacs -Q and a) it does not seem to have
the hanging problem and b) it also containes these reads, that take 0.4
to 0.9 seconds.

Any suggestion how I could narrow down the cause of this problem?

Thanks,

        Alex

--------------------------------------------------



In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-10-23 built on epsilon
Repository revision: 8ca70e402ecab5d7e71e418af6866c8b02d4f757
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.04.3 LTS

Recent messages:
221 2.0.0 ux-2s11.inf.fh-bonn-rhein-sieg.de closing connection
Mark set
Saving file /$HOME/mail/maildir/sent/cur/1503128660.60aa4ae141fa26ab.epsilon:2,S...
Wrote /$HOME/mail/maildir/sent/cur/1503128660.60aa4ae141fa26ab.epsilon:2,S
Sending...done
[mu4e] Message sent
Decrypting /$HOME/... done
Making completion list... [2 times]
user-error: Beginning of history; no preceding item
user-error: End of history; no default available
Quit [3 times]
Configured using:
 'configure --with-xwidgets'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XWIDGETS

Important settings:
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Major mode: Text

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syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev obarray minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote dbusbind inotify dynamic-setting
system-font-setting font-render-setting xwidget-internal move-toolbar
gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 608423 49945)
 (symbols 48 58676 0)
 (miscs 40 834 258)
 (strings 32 149915 22972)
 (string-bytes 1 5052290)
 (vectors 16 97583)
 (vector-slots 8 2293289 241078)
 (floats 8 2024 308)
 (intervals 56 754 138)
 (buffers 976 20)
 (heap 1024 99395 10246))