[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Change by Terry J. Reedy :


--
versions: +Python 3.10, Python 3.9

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Change by Terry J. Reedy :


--
resolution:  -> fixed
stage: test needed -> resolved
status: open -> closed

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[miss-islington]

miss-islington  added the comment:


New changeset 84694c3e7adadc97d7d8cee938fe84bbeb961387 by Miss Islington (bot) 
in branch '3.9':
bpo-42225: IDLE - document two unix-related problems. (GH-25078)
https://github.com/python/cpython/commit/84694c3e7adadc97d7d8cee938fe84bbeb961387


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[issue42225] Tkinter hangs or crashes when displaying astral chars

[miss-islington]

miss-islington  added the comment:


New changeset e92923b028024290a0e621b6b90e3221767d14d4 by Miss Islington (bot) 
in branch '3.8':
bpo-42225: IDLE - document two unix-related problems. (GH-25078)
https://github.com/python/cpython/commit/e92923b028024290a0e621b6b90e3221767d14d4


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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:

On macOS with 3.10.0a, 8.6.11 appears to fix this issue.
>>> chr(128516)
"😄"

For IDLE, I am adding a paragraph to the doc.  I will then close this issue as 
'fixed' (insofar as we can for what is a 3rd party failure).

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stage: patch review -> test needed

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[miss-islington]

Change by miss-islington :


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pull_requests: +23850
pull_request: https://github.com/python/cpython/pull/25106

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 8.0 -> 9.0
pull_requests: +23849
pull_request: https://github.com/python/cpython/pull/25105

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset 1b4a9c7956d5dc64f8002f62bf0faae2d1892f90 by Terry Jan Reedy in 
branch 'master':
bpo-42225: IDLE - document two unix-related problems. (#25078)
https://github.com/python/cpython/commit/1b4a9c7956d5dc64f8002f62bf0faae2d1892f90


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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Change by Terry J. Reedy :


--
keywords: +patch
pull_requests: +23828
stage: test needed -> patch review
pull_request: https://github.com/python/cpython/pull/25078

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:

No, seems strictly a matter of complicated color, which is perhaps becoming 
more common.  Firefox colors the checkbox (white checkmark on green field in a 
largish black square) but not the (smaller) pencil.  I did not recognize either 
the FF or tk Windows pencil as a pencil without any color (so I searched), so I 
won't be surprised if FF upgrades its pencil too.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

At least it is not a regression caused by support of astral characters 
(issue13153).

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:

I closed #43647 as a duplicate of this.  It reported that BMP chars can fail 
also.  For instance, with "Noto Sans Mono", but not 'Dejavu Mono', the 
following crash.
>>> '\u2705'
'✅'
>>> '\u270f'
'✏'

Unfortunately, as least on some *nix, the default tkFixedFont resolves to Noto 
Sans Mono.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ronald Oussoren]

Ronald Oussoren  added the comment:

I've filed Issue42318 about the surrogate pairs error I mention in msg380552.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

Change by STINNER Victor :


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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Please open a new issue for "surrogates not allowed".

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ronald Oussoren]

Ronald Oussoren  added the comment:

W.r.t. the SyntaxError I got (msg380552): It looks like it will be possible to 
work around that problem in _tkinter.c:unicodeFromTclStringAndSize by merging 
surrogate pairs.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ronald Oussoren]

Ronald Oussoren  added the comment:

Note that the main installers for Python 3.8 and 3.9 will continue to use Tk 
8.6.8 due to problems when building later Tk version on macOS 10.9.  

The current plan is to add an installer variant to (amongst others) uses Tk 
8.6.10 (and .11 when that's released).

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Serhiy, does Ronald's report above re 8.6.10 on macOS suggest what might be 
needed to make print("😀") work on Mac?  As I remember, your year-old _tkinter 
patch to make print() work on Linux and Windows converts Python strings 
differently on the two systems.  But you did not know for sure what to do for 
macOS because nothing would work.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The crash I had on macOS with tk 8.6.8 appears to be gone when using tk 8.6.10.

What I got back was a SyntaxError when pasting a smiley emoji in an IDLE shell 
window when trying to type execute print("😀").  The SyntaxError message says: 
'utf-8' codec can't encode characters in position 7-12: surrogates not allowed. 
 That's likely to to how Tk represents this character in its text widget, and 
is something we could work around when converting Tcl/Tk strings to Python 
strings.

Printing the emoji using 'print(chr(128516))' works fine.

The scriptlet in msg380173 also works.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ian Strawbridge]

Ian Strawbridge  added the comment:

On Ubuntu, Tk version is showing as 8.6.10
On Windows 10, Tk version is showing as 8.6.9

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ronald Oussoren]

Ronald Oussoren  added the comment:

I've filed a Tk issue about this: 
https://core.tcl-lang.org/tk/tktview/f9fa92d8e06972b5f0583b07a3c98eaac0a0

What versions of Tk are used? 
- On macOS I've tested with the  Python.org installer, which uses Tk 8.6.8.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ian Strawbridge]

Ian Strawbridge  added the comment:

Further to the information I posted on Stack Overflow (referred to above) 
relating to reproducing emoticon characters from Idle under Ubuntu, I have done 
more testing.  Based on some of the code/comments above, I tried modifications 
which I hoped might identify errors before Idle crashed.
At a simple level I can generate some error information in a Ubuntu terminal 
from the following.
usr/bin$ idle-python3.8
Entering chr(0x1f624) gives the following error message in terminal.
X Error of failed request:  BadLength (poly request too large or internal Xlib 
length error)
  Major opcode of failed request:  139 (RENDER)
  Minor opcode of failed request:  20 (RenderAddGlyphs)
  Serial number of failed request:  4484
  Current serial number in output stream:  4484

Another test used this code.
--
def FileSave(sav_file_name,outputstring):
with open(sav_file_name, "a", encoding="utf8",newline='') as myfile:
myfile.write(outputstring)

def FileSave1(sav_file_name,eoutputstring):
with open(sav_file_name, "a", encoding="utf8",newline='') as myfile:
myfile.write(eoutputstring)

tk = True
if tk:
from tkinter import Tk
from tkinter.scrolledtext import ScrolledText
root = Tk()
text = ScrolledText(root, width=80, height=40)
text.pack()
def print1(txt):
text.insert('insert', txt+'\n')

errors = []
outputstring = "Characters:"+ "\n"+"\n"
eoutputstring = "Errors:"+ "\n"+"\n"

#for i in range(0x1f600, 0x1f660):   #crashes at 0x1f624
for i in range(0x1f623, 0x1f624):  # 1f624, 1f625 then try 1f652  
chars = chr(i)
decimal = str(int(hex(i)[2:],16))
try:
outputstring = str(hex(i))+" "+decimal+" "+chars+ "\n"
FileSave("Charsfile.txt", outputstring)
print1(f"{hex(i)} {decimal} {chars}")
print(f"{hex(i)} {decimal} {chars}")
except Exception as e:
print(str(hex(i)))
eoutputstring = str(hex(i))+ "\n"
FileSave1("Errorfile.txt", eoutputstring)
errors.append(f"{hex(i)} {e}")

print("ERRORS:")

for line in errors:
print(line)

--
With the range starting at 0x1f623 and changing the end point, in Ubuntu, with 
end point 0x1f624, this prints ok, but if higher numbers are used the Idle 
windows all closed. However on some occasions, if I began with end point at 
0x1f624 and run, then without closing the editor window I increased the end 
point to 0x1f625, save and run, the Text window would close, but the console 
window would remain open.  I could then increase the upper range further and 
repeat and more characters would print to the console.
I have attached screenshots of the console output with the 
fonts-noto-color-emoji fonts package installed(with font), then with this 
package uninstalled (no font) and finally the same when run under Windows 10.  
For the console output produced while the font package is installed, if I 
select in the character column where there is a blank space, "something" can be 
selected.  If I save the console as a text file or select all the rows, copy 
and paste to a text file, the missing characters are revealed. When the font 
package is uninstalled, the missing characters are truely missing.  It is the 
apparently missing characters (such as 0x1f624, 0x1f62c, 0x1f641, 0x1f642, 
0x1f644-0x1f64f) which appear to be causing the Idle crashes.  Presumably such 
as 0x1f650 and 0x1f651 are unallocated codes so show up as rectangular 
outlines. 

In none of the tests with the more complex code above did I manage to generate 
any error output.

My set up is as follows.
Ubuntu 20.04.1 LTS
x86_64
GNOME version: 3.36.3
Python 3.8.6 (default, Sep 25 2020, 21:22:01) 
Tk version: 8.6.10
[GCC 7.5.0] on linux

Hopefully, the above might give some pointers to handling these characters.

--
nosy: +IanSt1
versions: +Python 3.8 -Python 3.10
Added file: https://bugs.python.org/file49581/Screenshots_128547-128593.pdf

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Kevin, Serhiy tried to report this upstream but failed.  msg380143.
Perhaps you could.

One person running my test program reported
"""
Fedora 32 x86-64
Cinnamon 4.6.7
Linux 5.8.16-200.fc32.x86_64
Python 3.8.6 (default, Sep 25 2020, 00:00:00)
[GCC 10.2.1 20200723 (Red Hat 10.2.1-1)] on linux

Running line-by-line in terminal, the for-loop crashes with:
<<<
X Error of failed request:  BadLength (poly request too large or internal Xlib 
length error)
  Major opcode of failed request:  138 (RENDER)
  Minor opcode of failed request:  20 (RenderAddGlyphs)
  Serial number of failed request:  3925
  Current serial number in output stream:  4865 
"""

Another reported "Seems to produce garbage on my system:
[ads@ADS4 x]$ uname -a
Linux ADS4 5.8.17-100.fc31.x86_64 #1 SMP Thu Oct 29 18:58:48 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux"

But the program ran to completion without errors.  A copy of the output from 
the window was attached.  I have asked for the tcl/tk version. My response 
included:
"""
On *nix, Python (unicode) chars are utf-8 encoded by _tkinter for tk.  The 
encoding of astral non-BMP chars uses 4 bytes.  Perhaps tk on your ADS Linux 
(new to me) displays the 4 bytes as 4 chars instead of 1.   For each block of 
32, the first 3 are the same.  This is true in this file, but easily seeing 
this depends on the display software.

I don't know what you saw, but Notepad++ displays control chars with the high 
bit set (C1 controls) as their reversed type (white on black) 3 char acronym as 
defined on  
https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block) Character 
table.

Thus the first astral U+1 is encoded as b"\xF0\x90\x80\x80.  In Notepad++, 
what is in the file appears as 4 characters, not 1, displayed 'ðDCSPADPAD', 
with the part after ð being being the correct white on black triplets for code 
points U+90 and U+80.  The first char '\xf0' == 'ð' is the same for all 
quadruples shown by Notepad++. The next 3 vary as appropriate.  In some cases, 
all 4 are normal printable chars, such as 0x29aa0, a CJK char, showing as "𩪠"

If I cut the first 4 chars from Notepad++ to Thunderbird the result is "𐀀". 
I see only ð but the presence of 3 0-width chars is revealed by moving through 
the string with arrow keys. 
"""
Here on Firefox the C1 controls, invisible in Thunderbird, display as squares 
with digits 0090, 0080 in two rows. Serhiy probably understands these reports 
better than I do.  This tc in ADS4 Linux seems to doing something like what 
Serhiy described as "Tcl fails to decode the string from UTF-8 and falls back 
to Latin1" before his _tkinter fix.

As far as IDLE and Linux is concerned, I am just going to consider what to 
change or add in "User output in Shell" in the IDLE doc.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Kevin Walzer]

Kevin Walzer  added the comment:

Some work has been done this year on expanding support for these types of 
glyphs in Tk, but I'm not sure of its current state--it's not my area of 
expertise. Can you open a ticket at https://core.tcl-lang.org/tk/ so one of the 
folks working on this can take a look?

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ronald Oussoren]

Ronald Oussoren  added the comment:

@Kevin Walzer: Is the problem were seeing a known issue with Tk?

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

STINNER Victor  added the comment:

> This version catches exceptions and reports them separately and runs directly 
> with tkinter, in about a second.

The X Error is displayed and then the process exit. Python cannot catch this 
fatal X Error.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

STINNER Victor  added the comment:

The following program fails with:
---
X Error of failed request:  BadLength (poly request too large or internal Xlib 
length error)
  Major opcode of failed request:  138 (RENDER)
  Minor opcode of failed request:  20 (RenderAddGlyphs)
  Serial number of failed request:  4248
  Current serial number in output stream:  4956
---

Python program:
---
from tkinter import Tk
from tkinter.scrolledtext import ScrolledText
root = Tk()
text = ScrolledText(root, width=80, height=40)
text.pack()

for i in range(0x1, 0x4, 32):
chars = ''.join(chr(i+j) for j in range(32))
text.insert('insert', f"{hex(i)} {chars}\n")

input("Press enter to exit")
---

It seems like the first character which triggers this RenderAddGlyphs BadLength 
issue is: U+1f6c2. See attached emoji.png screenshot. As you can see, some 
emojis are rendered in color in Gnome Terminal. I guess that it uses the Gtk 3 
pango library to render these characters.

--
Added file: https://bugs.python.org/file49567/emojis.png

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

It works on Ubuntu if uninstall the color Emoji font (package 
fonts-noto-color-emoji).

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Victor, does my test run to completion (without exception) on your Fedora?  If 
it does, I definitely would not disable astral char display on Fedora.  This 
version catches exceptions and reports them separately and runs directly with 
tkinter, in about a second.

tk = True
if tk:
from tkinter import Tk
from tkinter.scrolledtext import ScrolledText
root = Tk()
text = ScrolledText(root, width=80, height=40)
text.pack()
def print(txt):
text.insert('insert', txt+'\n')

errors = []
for i in range(0x1, 0x4, 32):
chars = ''.join(chr(i+j) for j in range(32))
try:
   print(f"{hex(i)} {chars}")
except Exception as e:
errors.append(f"{hex(i)} {e}")
print("ERRORS:")
for line in errors:
print(line)

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[E. Paine]

E. Paine  added the comment:

For me, this is not limited to special characters. Trying to load anything in 
Tk using the 'JoyPixels' font crashes (sometimes it does load but all 
characters are very random - most are whitespace - and it crashes again after a 
call to `fc-cache`). IDLE crashes when trying to preview the font.

I believe this is what is being experienced on 
https://askubuntu.com/questions/1236488/x-error-of-failed-request-badlength-poly-request-too-large-or-internal-xlib-le
 because they are not using any special characters yet are reporting the same 
problem.

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components:  -macOS
nosy: +epaine

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

STINNER Victor  added the comment:

> Fixing OS graphics or tk is out of scope for us.  Preventing hangs or crashes 
> when using tkinter is.  On Mac, refusing to insert any astral char into a tk 
> widget might be the best solution.  Serhiy, could that be done in 
> tkinter/_tkinter?

I dislike attempting to workaround Tk issues in Python. As you can see, the 
behavior really depends on the platform. As I wrote, on Fedora 32 it works (the 
character is rendered properly). I would prefer to not block such character on 
Fedora 32 because it does crash on some other platforms.

Or you should detect the very precise conditions explaining why it works on 
some platforms and crash on some other platforms...

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

Terry J. Reedy  added the comment:

In IDLE on Windows the following prints the first 3 astral planes in a couple 
of minutes.

for i in range(0x1, 0x4, 32):
chars = ''.join(chr(i+j) for j in range(32))
print(hex(i), chars)

Perhaps half of the assigned chars in the first plane are printed instead of 
being replaced with a narrow box. This includes emoticons as foreground color 
outlines on background color.  Maybe all of the second plane of extended CJK 
chars are printed.  The third plane is unassigned and prints as unassigned 
boxes (with an X).

Fixing OS graphics or tk is out of scope for us.  Preventing hangs or crashes 
when using tkinter is.  On Mac, refusing to insert any astral char into a tk 
widget might be the best solution.  Serhiy, could that be done in 
tkinter/_tkinter?

On Linux, the situation appears to be more complex.  The SO questioner
https://stackoverflow.com/questions/64615570/why-do-some-emoticons-cause-python-idle-to-crash-on-ubuntu
could print the two multicolor 'grinning face with smiling eyes' 😄, which fails 
for Serhiy, but not the simpler thumbsup 👍.  I don't know if we can detect 
fonts that cause crashes.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The error on Linux could be related to this issue: 
https://bugzilla.redhat.com/show_bug.cgi?id=1498269

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

It looks different on my computer. I suppose it will crash to you too if you 
install a color emoji font.

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Added file: https://bugs.python.org/file49557/Ubuntu-2020.04.png

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

STINNER Victor  added the comment:

> Victor, do you see a color smiling face in my example or monochromatic or 
> just a bar?

See attached screenshot: fedora32.png.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Victor, do you see a color smiling face in my example or monochromatic or just 
a bar?

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Yes, on Linux. Ubuntu 2020.04. Tk 8.6.10. X.Org X Server 1.20.8.

I tried to report the bug upstream, but failed. I did not use the Tk bugtracker 
several years, and it was on different computer, so I have no password to my 
account, and when I tried to create new accounts, I cannot login with them too. 
I tried to write to the mailing list, but it requires subscribing, and when I 
subscribed I did not receive a message with confirmation. If anybody can, 
please report this bug to Tk developers.

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

STINNER Victor  added the comment:

Serhiy's test also work as expected.

$ wish
% label .l -text 😄

Since the Serhiy's test doesn't use Python, is it worth it to track this Tk 
crash in the Python bug tracker?

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

STINNER Victor  added the comment:

Hum, I didn't explain well. My test. I ran:

./python -m idlelib

In the IDLE shell, I wrote chr(0x1F604) which displays the emoji as expected:

>>> chr(0x1F604)
'😄'

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

I generated a script for testing all characters:

with open('withtest.sh', 'w', errors='surrogatepass') as f:
for i in range(0x100, 0x11): print(f"echo 'label .l -text \"{chr(i)}\"; 
exit' | wish 2>/dev/null && echo OK '\\U{i:08x}' {chr(i)!r} || echo FAIL 
'\\U{i:08x}' {chr(i)!r}", file=f)

It takes a time. It tested around 20% of all characters for 6-7 hours. And it 
seems that all failed characters are colored emojies and all passed characters 
are non-colored. Seems it is related either to the font that provides colored 
emojies, or to the mechanism that interprets such fonts, or Tk just cannot 
correctly handle the output when such fonts are used (maybe reserve too small 
buffer or cannot interpret result code).

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[STINNER Victor]

STINNER Victor  added the comment:

Serhiy:
> I get a crash for chr(128516) ("😄") in Tk.

On Linux? What is your Tk version?

On my Fedora 32, the character is displayed properly. It seems like Tk is still 
using X11 whereas my GNOME desktop is using Wayland.

$ ./python -m test.pythoninfo|grep ^tkinter
tkinter.TCL_VERSION: 8.6
tkinter.TK_VERSION: 8.6
tkinter.info_patchlevel: 8.6.10

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

I get a crash for chr(128516) ("😄") in Tk.

$ wish
% label .l -text 😄
.l
% X Error of failed request:  BadLength (poly request too large or internal 
Xlib length error)
  Major opcode of failed request:  139 (RENDER)
  Minor opcode of failed request:  20 (RenderAddGlyphs)
  Serial number of failed request:  599
  Current serial number in output stream:  599

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[issue42225] Tkinter hangs or crashes when displaying astral chars

[Terry J. Reedy]

New submission from Terry J. Reedy :

On my macOS Mohave, 3.10, echoing '\U0001' (# = hex digit) or chr(#) 
(decimal digits) in IDLE's shell either prints an error box or hangs.  On 
#13153, freezing on macOS was reported for 3.7.6.  Until tkinter on Mac works 
better, we should try to get an error box for all astral chars.

For an SO questioner with Ubuntu 18.04, now updated to 20.04 with python 3.8.6, 
some chars display (128512-128547; 128549-128555; 128557-128576, example 
chr(128516)) and some 'crash' (example chr(128077)).  I am trying to get 
'crash' narrowed down and the tk version Ubuntu uses.
Serhiy, does >>> chr(128516) echo thumbs up on your Linux?

The SO crash example works for me on Windows.  I should test more codepoints.

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components: Tkinter, Unicode, macOS
messages: 380112
nosy: ezio.melotti, ned.deily, ronaldoussoren, serhiy.storchaka, terry.reedy, 
vstinner
priority: normal
severity: normal
stage: test needed
status: open
title: Tkinter hangs or crashes when displaying astral chars
type: behavior
versions: Python 3.10

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