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bug#28630: 27.0.50; C-g while a non-main thread is sitting crashes Emacs


From: Alex
Subject: bug#28630: 27.0.50; C-g while a non-main thread is sitting crashes Emacs
Date: Thu, 28 Sep 2017 01:22:58 -0600

Evaluate the following in emacs -Q:

(make-thread
 (lambda ()
   (message "hello")
   (sit-for 2)
   (message "there")))

Executing C-g before this finishes crashes Emacs. Here's a backtrace:

#0  0x00007fffefa8bfcf in __GI_raise (address@hidden) at 
../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007fffefa8d3fa in __GI_abort () at abort.c:89
#2  0x00007fffefac9bd0 in __libc_message (address@hidden, address@hidden "*** 
%s ***: %s terminated\n") at ../sysdeps/posix/libc_fatal.c:175
#3  0x00007fffefb521b7 in __GI___fortify_fail (msg=0x7fffefbbd284 <longjmp_msg> 
"longjmp causes uninitialized stack frame") at fortify_fail.c:30
#4  0x00007fffefb520ed in ____longjmp_chk () at 
../sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S:100
#5  0x00007fffefb5204b in __longjmp_chk (address@hidden <getcjmp>, 
address@hidden) at ../setjmp/longjmp.c:38
#6  0x00000000004f3007 in quit_throw_to_read_char (address@hidden) at 
keyboard.c:10537
#7  0x0000000000501a4c in set_waiting_for_input (address@hidden) at 
keyboard.c:10311
#8  0x00000000005a5d6d in wait_reading_process_output (address@hidden, 
address@hidden, address@hidden, address@hidden, wait_for_cell=..., 
    address@hidden, address@hidden, just_wait_proc=0) at process.c:5172
#9  0x0000000000424000 in sit_for (timeout=..., address@hidden, address@hidden)
    at dispnew.c:5764
#10 0x00000000004fdeef in read_char (address@hidden, map=..., 
    address@hidden, prev_event=..., address@hidden, address@hidden)
    at keyboard.c:2724
#11 0x00000000004feb2c in read_key_sequence (address@hidden, prompt=..., 
    address@hidden, address@hidden, address@hidden, address@hidden, 
address@hidden, bufsize=30) at keyboard.c:9154
#12 0x0000000000500576 in command_loop_1 () at keyboard.c:1372
#13 0x000000000056495e in internal_condition_case (address@hidden 
<command_loop_1>, handlers=..., 
    address@hidden, address@hidden <cmd_error>) at eval.c:1332
#14 0x00000000004f2444 in command_loop_2 (ignore=..., address@hidden) at 
keyboard.c:1114
#15 0x00000000005648cd in internal_catch (tag=..., address@hidden, 
address@hidden <command_loop_2>, arg=..., 
    address@hidden) at eval.c:1097
#16 0x00000000004f23db in command_loop () at keyboard.c:1093
#17 0x00000000004f6ac3 in recursive_edit_1 () at keyboard.c:699
#18 0x00000000004f6de6 in Frecursive_edit () at keyboard.c:770
#19 0x000000000041a3f1 in main (argc=<optimized out>,
#argv=0x7fffffffe7a8) at emacs.c:1713

In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.18)
 of 2017-09-28 built on lylat
Repository revision: 1f02ae39310f15bf683642b9aee1cf162bd391e6
Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
System Description:     Debian GNU/Linux testing (buster)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 LCMS2






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