Bug#1121908: Bug#1121911: libgtk-3-0t64: cups backend freezes when attempting to print from GTK application

[Simon McVittie]

Control: reassign -1 libcups2t64 2.4.15-1
Control: affects -1 + libgtk-3-0t64 papers evince atril
Control: tags -1 + moreinfo

On Thu, 04 Dec 2025 at 17:20:52 +0100, Timo Röhling wrote:
>when I attempt to open the printing dialog from atril or Firefox, the 
>application freezes as soon as CUPS is accessed. CUPS itself works fine

GTK 3 and 4 in testing/unstable haven't changed recently, so I suspect 
this is a libcups regression, probably the same one as 
#1121751/#1121895/#1121660 (recently fixed in unstable by a new cups 
upload). Please try with libcups2t64/2.4.16-1 when it becomes available 
on your mirror.

The same is true for the bugs reported against papers and evince.

>#4  0x00007fffbcd9e271 in poll (__fds=0x7fffffffe090, __nfds=1, __timeout=0) at /usr/include/x86_64-linux-gnu/bits/poll2.h:44
>#5  _httpWait (http=<optimized out>, usessl=<optimized out>, msec=0) at ./cups/http.c:3082
>#6  _httpWait (http=<optimized out>, msec=0, usessl=<optimized out>) at ./cups/http.c:3039
>#7  0x00007fffbf42f3b4 in _post_check (request=0x555555c6e490) at ../../../modules/printbackends/cups/gtkcupsutils.c:1177
>#8  0x00007fffbf4306e5 in gtk_cups_request_read_write (request=0x555555c6e490, connect_only=connect_only at entry=0) at ../../../modules/printbackends/cups/gtkcupsutils.c:298
>#9  0x00007fffbf424548 in cups_dispatch_watch_check (source=0x555555ba2060) at ../../../modules/printbackends/cups/gtkprintbackendcups.c:1586

This is consistent with it being a libcups regression.

     smcv