test_wm_iconbitmap() timeout after 10 min on "macOS / build and test (macos-26-intel)" CI

Example of failure: https://github.com/python/cpython/actions/runs/23552862012/job/68571481619?pr=146357

(...)
test_wm_attribute (test.test_tkinter.test_misc.WmTest.test_wm_attribute) ... ok
test_wm_iconbitmap (test.test_tkinter.test_misc.WmTest.test_wm_iconbitmap) ... Timeout (0:10:00)!
Thread 0x00007ff85c48cc00 (most recent call first):
  File "/Users/runner/work/cpython/cpython/Lib/tkinter/__init__.py", line 2345 in wm_iconbitmap
  File "/Users/runner/work/cpython/cpython/Lib/test/test_tkinter/test_misc.py", line 582 in test_wm_iconbitmap
  File "/Users/runner/work/cpython/cpython/Lib/unittest/case.py", line 613 in _callTestMethod
  File "/Users/runner/work/cpython/cpython/Lib/unittest/case.py", line 667 in run
(...)

test.pythoninfo:

tkinter.TCL_VERSION: 9.0
tkinter.TK_VERSION: 9.0
tkinter.info_patchlevel: 9.0.3

The test_wm_iconbitmap() test was added by commit 58e9f95.

Linked PRs

"Lib/tkinter/__init__.py, line 2345 in wm_iconbitmap" is the last line of wm_iconbitmap(), where I added the comment:

    def wm_iconbitmap(self, bitmap=None, default=None):
        """Set bitmap for the iconified widget to BITMAP. Return
        the bitmap if None is given.

        Under Windows, the DEFAULT parameter can be used to set the icon
        for the widget and any descendants that don't have an icon set
        explicitly.  DEFAULT can be the relative path to a .ico file
        (example: root.iconbitmap(default='myicon.ico') ).  See Tk
        documentation for more information."""
        if default is not None:
            return self.tk.call('wm', 'iconbitmap', self._w, '-default', default)
        else:
            return self.tk.call('wm', 'iconbitmap', self._w, bitmap) # <=== HANGS HERE

It seems that it hangs on the first call with argument. I don't have macOS, so I cannot test in what circumstances it hangs. Can this be reproduced manually?

$ wish
% toplevel .t
.t
% wm iconbitmap .t
% wm iconbitmap .t hourglass
%

Is is a bug in Tk 9.0.3 or in all Tk 9.0 versions and we just started to run tests with 9.0?

I don't have macOS, so I cannot test.

Is is a bug in Tk 9.0.3 or in all Tk 9.0 versions and we just started to run tests with 9.0?

Good question. I didn't check if Tk was upgraded recently on the macOS-intel image.

I suspect this is due to switching from the macos-15-intel runner to macos-26-intel on 25th March: #145099.

We started getting timeouts on 26th March: https://github.com/python/cpython/actions/runs/23591302016/job/68696963892

Actually, the very first run after the merge had a timeout on first attempt, and pass on the next: https://github.com/python/cpython/actions/runs/23538226684/job/68518834548#step:10:2115

Looks like a bug in Tk 9.0.3 on macOS 26 Intel, but macOS 26 Apple Silicon and macOS 15 (Intel + Apple Silicon) are all fine.

Here's a test of running wish with 'wm iconbitmap . hourglass\nputs "OK: wm iconbitmap succeeded"\nexit\n' on all four. macOS 26 Intel times out after 60s, the others pass in a second or less:

This needs reporting to Tk.

Some things we could do in the meantime:

Switch back to macos-15-intel for now
Conditionally skip test_wm_iconbitmap
(There's already a conditional skip for another Tk bug 13ac26b35dc55f7c37f70b39d59d7ef3e63017c8)

Is is a bug in Tk 9.0.3 or in all Tk 9.0 versions and we just started to run tests with 9.0?

Unknown if it's only in 9.0.3. We've been testing 9.0.3 since November, and macOS 26 only since March.

Is is a bug in Tk 9.0.3 or in all Tk 9.0 versions and we just started to run tests with 9.0?

Also times out with version 8, specifically 8.6.17:

https://github.com/hugovk/test/actions/runs/23889733245

Reported: https://core.tcl-lang.org/tk/tktview/4a2070f0d3a99aa412bc582d386d575ca2f37323

I opened #148032 to skip the Tk test on macOS 26 Intel, but the CI hung when configuring CPython:

https://github.com/python/cpython/actions/runs/23944426082/job/69837525233?pr=148032

We've seen some other similar things too: #145098 (comment)

So I've also opened #148038 to switch back to macos-15-intel for the main tests.

The GitHub Action jobs moved back to macos-15-intel which should work around this issue. So I close this issue for now. Reopen it if the issues reappears on our CIs.

Re-opening to fix the timeout now we're ready to upgrade the CI: #149991.

I don't recall seeing this particular timeout when running tests on real Macs, either Apple Silicon or Intel. It could be due to the GHA setup. I don't have access to an Intel Mac at the moment but I can test it next week after PyCon.

Can we close the issue since PR gh-148032 has been merged?

Can we close the issue since PR gh-148032 has been merged?

I would prefer to keep it open until we know better why this timeout occurs. We shouldn't have to disable the test.

I've backported #149991 from main back to 3.12 and we ran into some timeouts:

Backport PRs of #149991

Branch	PR	macOS job	tkinter
3.15	#153179 (merged)	green, 18m	Timeout (10 min) first pass; rerun passed
3.14	#153181 (merged)	green, 18m	Passed, no timeout
3.13	#153185 (open)	red, 25m	SIGSEGV first pass; Timeout (10 min) on rerun
3.12	#153186 (merged)	green, 14m	Passed, no timeout

Post-merge branch runs

Branch	macOS job	tkinter
3.15	green, 28m	Timeout (10 min) first pass; rerun passed
3.14	red, 27m	SIGSEGV first pass; Timeout (10 min) on rerun
3.13	—	Not merged yet
3.12	green, 17m	Passed, no timeout

So I'll also backport the test skip, until we get a fix.

[3.12] gh-146531: Skip hanging `wm iconbitmap` test on macOS 26 Intel (…

[3.13] gh-146531: Skip hanging `wm iconbitmap` test on macOS 26 Intel (…

[3.14] gh-146531: Skip hanging `wm iconbitmap` test on macOS 26 Intel (…

[3.15] gh-146531: Skip hanging `wm iconbitmap` test on macOS 26 Intel (…

Try to backport PRs for #69134. The parts which touch existing tests, because many new tests were added.

We just got a timeout on for this test macos-26-intel at https://github.com/python/cpython/actions/runs/28940873616/job/85862500892?pr=153327 with Tk 8.6.18.

When 8.6.17 and 9.0.3 were the latest versions, we added this skip:

        if (
            t._windowingsystem == 'aqua'
            and sys.platform == 'darwin'
            and platform.machine() == 'x86_64'
            and platform.mac_ver()[0].startswith('26.')
            and (
                patchlevel[:3] <= (8, 6, 17)
                or (9, 0) <= patchlevel[:3] <= (9, 0, 3)
            )
        ):
            # https://github.com/python/cpython/issues/146531
            # Tk bug 4a2070f0d3a99aa412bc582d386d575ca2f37323
            self.skipTest('wm iconbitmap hangs on macOS 26 Intel')

Since then, 8.6.18 and 9.0.4 have come out, and 8.6.18 has filtered through Homebrew to our tests. We're still on 9.0.3 on main.

I suggest we skip for all versions until there's a fix available:

        if (
            t._windowingsystem == 'aqua'
            and sys.platform == 'darwin'
            and platform.machine() == 'x86_64'
            and platform.mac_ver()[0].startswith('26.')
        ):
            # https://github.com/python/cpython/issues/146531
            # Tk bug 4a2070f0d3a99aa412bc582d386d575ca2f37323
            # Not fixed as of Tk 8.6.18 and 9.0.4.
            self.skipTest('wm iconbitmap hangs on macOS 26 Intel')

Try to backport PRs for #69134. The parts which touch existing tests, because many new tests were added.

Those three PRs have all been backported to 3.13. We test Tk 9 on main/3.15, and still have Tk 8 on 3.14 and older.

Here's a run on 3.14, modified to do 4 x macos-26-intel, so it has 8.6.18 that evades the skip, and we can see if those PRs help:

https://github.com/hugovk/cpython/actions/runs/28951087032

And we got four timeouts:

Result: FAILURE then SUCCESS
Result: FAILURE then FAILURE
Result: FAILURE then SUCCESS
Result: SUCCESS

So they don't help in this case.

gh-146531: Broaden `wm_iconbitmap` skip on macOS 26 Intel (#153348)

[3.12] gh-146531: Broaden `wm_iconbitmap` skip on macOS 26 Intel (GH-…

[3.14] gh-146531: Broaden `wm_iconbitmap` skip on macOS 26 Intel (GH-…

[3.13] gh-146531: Broaden `wm_iconbitmap` skip on macOS 26 Intel (GH-…

[3.15] gh-146531: Broaden `wm_iconbitmap` skip on macOS 26 Intel (GH-…

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test_wm_iconbitmap() timeout after 10 min on "macOS / build and test (macos-26-intel)" CI #146531

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test_wm_iconbitmap() timeout after 10 min on "macOS / build and test (macos-26-intel)" CI #146531

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vstinner commented on Mar 27, 2026

serhiy-storchaka commented on Mar 28, 2026

vstinner commented on Apr 1, 2026

hugovk commented on Apr 2, 2026

hugovk commented on Apr 2, 2026

hugovk commented on Apr 2, 2026

hugovk commented on Apr 3, 2026

vstinner commented on Apr 7, 2026

hugovk commented on May 18, 2026

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ned-deily commented on May 18, 2026

vstinner commented on May 18, 2026

ned-deily commented on May 18, 2026

hugovk commented on Jul 6, 2026

Backport PRs of #149991

Post-merge branch runs

serhiy-storchaka commented on Jul 6, 2026

hugovk commented on Jul 8, 2026

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