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Bug#1016363: libx11 v1.8.1 does fail in a subtle way withj modale dialogs

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Package: libx11-6
Version: 2:1.8.1-1
Severity: critical

When upgrading libx11 from 2:1.7.5-1 to 2:1.8.1-1 X will fail in a very
strange way immediately when a modal dialog starts (like pinentry).

I use fvwm and have focus follow mouse. When pinentry starts, the focus
still stays on the window that I use before. (xterm) But there is no way
anymore to change focus. Even more, when killing the pinentry, the
process is gone but the window is still on the screen. The whole X is
fully infunctional afterwards.

The only solution is to kill (-9) the whole X stack. A simple kill
(-TERM) will not end the dysfunctional X session.

Going back to libx11 2:1.7.5-1 solves the problem.

Note, the same bug happens on gentoo. I opened bug #862115 over there
yesterday.

-- System Information:
Debian Release: bookworm/sid
  APT prefers experimental
  APT policy: (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.16.17 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_FIRMWARE_WORKAROUND, TAINT_OOT_MODULE
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages libx11-6 depends on:
ii  libc6        2.33-8
ii  libx11-data  2:1.7.5-1
ii  libxcb1      1.14-3

libx11-6 recommends no packages.

libx11-6 suggests no packages.

-- no debconf information

-- 
Klaus Ethgen                                       http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16            Klaus Ethgen <Klaus@Ethgen.ch>
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C

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Bug#1016363: libx11 v1.8.1 does fail in a subtle way withj modale dialogs Klaus Ethgen <Klaus@ethgen.de> - 2022-07-30 07:40 +0200
  Bug#1016363: libx11-6 1.8.1 also breaks notion Göran Weinholt <goran@weinholt.se> - 2022-07-30 13:10 +0200
  Bug#1016363: More info about the fvwm deadlock with libx11-6 1.8.1 Max Bell <mbell@pobox.com> - 2022-07-31 02:40 +0200
  Bug#1016363: libx11-6 1.8.1 also breaks glxinfo Hermann Meyer <brummer-@web.de> - 2022-08-01 15:10 +0200
    Bug#1016363: libx11-6 1.8.1 also breaks glxinfo gregor herrmann <gregoa@debian.org> - 2022-08-03 20:40 +0200
  Bug#1016363: libx11-6 1.8.1 also breaks glxinfo Max Bell <mbell@pobox.com> - 2022-08-03 20:40 +0200
    Bug#1016363: libx11-6 1.8.1 also breaks glxinfo Michel Dänzer <michel.daenzer@mailbox.org> - 2022-08-04 10:40 +0200
    Bug#1016363: libx11-6 1.8.1 also breaks glxinfo "Richard B. Kreckel" <kreckel@in.terlu.de> - 2022-08-04 12:40 +0200

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