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bug#33252: 27.0.50; Recursive password prompt takes over
From: |
Juri Linkov |
Subject: |
bug#33252: 27.0.50; Recursive password prompt takes over |
Date: |
Sun, 04 Nov 2018 01:41:41 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu) |
A bug in a shell script caused an infinitive stream of the same output lines:
Password: sh: 1: read: Illegal option -s
Password: sh: 1: read: Illegal option -s
Password: sh: 1: read: Illegal option -s
Password: sh: 1: read: Illegal option -s
Password: sh: 1: read: Illegal option -s
...
Currently Emacs handles such shell output very poorly and fails
with the following backtrace:
Debugger entered--Lisp error: (error "Variable binding depth exceeds
max-specpdl-size")
read-string("(In buffer *shell*) Password: sh: 1: read: Ill..." nil t nil)
read-passwd("(In buffer *shell*) Password: sh: 1: read: Ill...")
comint-send-invisible("Password: sh: 1: read: Illegal option
-s\nPassword:...")
comint-watch-for-password-prompt("Password: sh: 1: read: Illegal option
-s\n\nPassword...")
run-hook-with-args(comint-watch-for-password-prompt "Password: sh: 1: read:
Illegal option -s\n\nPassword...")
comint-output-filter(#<process shell<1>> "Password: sh: 1: read: Illegal
option -s\n\nPassword...")
...
read-string("(In buffer *shell*) sh: 1: read: Illegal optio..." nil t nil)
read-passwd("(In buffer *shell*) sh: 1: read: Illegal optio...")
comint-send-invisible("sh: 1: read: Illegal option -s\nPassword: sh: 1:
re...")
comint-watch-for-password-prompt("sh: 1: read: Illegal option -s\n\nPassword:
sh: 1: r...")
run-hook-with-args(comint-watch-for-password-prompt "sh: 1: read: Illegal
option -s\n\nPassword: sh: 1: r...")
comint-output-filter(#<process shell<1>> "sh: 1: read: Illegal option
-s\n\nPassword: sh: 1: r...")
...
read-string("(In buffer *shell*) sh: 1: read: Illegal optio..." nil t nil)
read-passwd("(In buffer *shell*) sh: 1: read: Illegal optio...")
comint-send-invisible("sh: 1: read: Illegal option -s\nPassword: sh: 1:
re...")
comint-watch-for-password-prompt("sh: 1: read: Illegal option -s\n\nPassword:
sh: 1: r...")
run-hook-with-args(comint-watch-for-password-prompt "sh: 1: read: Illegal
option -s\n\nPassword: sh: 1: r...")
comint-output-filter(#<process shell<1>> "sh: 1: read: Illegal option
-s\n\nPassword: sh: 1: r...")
...
A reproducible short test case:
0. emacs -Q
1. M-&
while true; do echo -n "Password: "; sleep 1; done
RET
After 42 seconds Emacs session becomes completely unusable, and control
can be regained only after killing the shell script from outside Emacs.
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Juri Linkov <=