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Ctrl-\ during completion makes zsh quit

Ctrl-\ during completion makes zsh quit. To reproduce the problem
with "zsh -f" under Debian/unstable:

Run the following commands:

zstyle ':completion:*' menu select=long
autoload -U compinit

Then ';' followed by [Tab]. I get:

zsh: do you wish to see all 6124 possibilities (3062 lines)? 

Type [Tab] again, then Ctrl-\. I get:

_gem                                lnstat                            
_generic  ^\zsh: quit (core dumped)  zsh -f

The backtrace:

Core was generated by `zsh -f'.
Program terminated with signal SIGQUIT, Quit.
#0  0x00007fbddaddaef3 in __GI___libc_write (fd=10, 
    buf=0x561d9de07240 <shoutbuf>, nbytes=8192)
    at ../sysdeps/unix/sysv/linux/write.c:26
26      ../sysdeps/unix/sysv/linux/write.c: No such file or directory.
(gdb) bt
#0  0x00007fbddaddaef3 in __GI___libc_write (fd=10, 
    buf=0x561d9de07240 <shoutbuf>, nbytes=8192)
    at ../sysdeps/unix/sysv/linux/write.c:26
#1  0x00007fbddad6c625 in _IO_new_file_write (f=0x561d9e7b12c0, 
    data=0x561d9de07240 <shoutbuf>, n=8192) at fileops.c:1176
#2  0x00007fbddad6b996 in new_do_write (fp=fp@entry=0x561d9e7b12c0, 
    data=0x561d9de07240 <shoutbuf> "lp\033[27m", ' ' <repeats 32 times>, "\033[27m\033[J\n_history_modifiers\033[27m", ' ' <repeats 16 times>, "\033[27m  \033[27m\033[Jlp_solve\033[27m", ' ' <repeats 26 times>, "\033[27m\033[J\n_host\033[27m", ' ' <repeats 29 times>, "\033[27m  \033[27"..., to_do=to_do@entry=8192)
    at libioP.h:948
#3  0x00007fbddad6d6c9 in _IO_new_do_write (to_do=8192, data=<optimized out>, 
    fp=0x561d9e7b12c0) at fileops.c:423
#4  _IO_new_do_write (fp=fp@entry=0x561d9e7b12c0, data=<optimized out>, 
    to_do=8192) at fileops.c:423
#5  0x00007fbddad6db9f in _IO_new_file_overflow (f=0x561d9e7b12c0, ch=32)
    at fileops.c:765
#6  0x00007fbdda6413a9 in clprintm (g=g@entry=0x561d9ea8e3a0, 
    mp=mp@entry=0x561d9ea847d0, mc=mc@entry=1, ml=ml@entry=645, 
    lastc=lastc@entry=1, width=36) at ../../../Src/Zle/complist.c:1886
#7  0x00007fbdda642a5e in compprintlist (showall=<optimized out>)
    at ../../../Src/Zle/complist.c:1621
#8  complistmatches (dummy=<optimized out>, dat=<optimized out>)
    at ../../../Src/Zle/complist.c:2098
#9  0x00007fbddabe847e in list_matches (dummy=<optimized out>, 
    dummy2=<optimized out>) at ../../../Src/Zle/compresult.c:2317
#10 0x00007fbddac1de06 in zrefresh () at ../../../Src/Zle/zle_refresh.c:1769
#11 0x00007fbddac10f36 in zlecore () at ../../../Src/Zle/zle_main.c:1186
#12 0x00007fbddac11dcc in zleread (lp=<optimized out>, rp=<optimized out>, 
    flags=<optimized out>, context=<optimized out>, 
    init=0x7fbddac3041d "zle-line-init", 
    finish=0x7fbddac3040d "zle-line-finish")
    at ../../../Src/Zle/zle_main.c:1350
#13 0x0000561d9dd84558 in zleentry (cmd=cmd@entry=1) at ../../Src/init.c:1627
#14 0x0000561d9dd85ac1 in inputline () at ../../Src/input.c:295
#15 ingetc () at ../../Src/input.c:228
#16 0x0000561d9dd85c2f in ingetc () at ../../Src/input.c:196
#17 0x0000561d9dd7d7a7 in ihgetc () at ../../Src/hist.c:408
#18 0x0000561d9dd8f2f6 in gettok () at ../../Src/lex.c:611
#19 zshlex () at ../../Src/lex.c:275
#20 0x0000561d9dd9008e in zshlex () at ../../Src/lex.c:268
#21 0x0000561d9ddaf4a6 in parse_event (endtok=endtok@entry=37)
    at ../../Src/parse.c:581
#22 0x0000561d9dd80e79 in loop (toplevel=toplevel@entry=1, 
    justonce=justonce@entry=0) at ../../Src/init.c:150
#23 0x0000561d9dd84b7e in zsh_main (argc=<optimized out>, argv=<optimized out>)
    at ../../Src/init.c:1781
#24 0x00007fbddad12cca in __libc_start_main (main=0x561d9dd48d40 <main>, 
    argc=2, argv=0x7ffc3568ef38, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7ffc3568ef28)
    at ../csu/libc-start.c:308
#25 0x0000561d9dd48d7a in _start ()

BTW, in addition to the SIGQUIT issue, it shouldn't be that easy to
generate so much output for the completions (I did that by mistake).

Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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