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a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=YigZRSCef5s/W4cCEpVQsj5Fbe+LawEQaEHXJezB44o=; b=iXdzP8xyQIkiL1YtMl9jjRxy08A/usnueCwvPJQPfUXyORarhIXtmT1y8+BPUf4yvUG6fLH8rddLF3WuJ5ZcVC0QnghriOavCy0taG7H6jGoAe/VXc9L6vi1u2eVqoHB3uKyFAcjmFsS6oqXNGt1Yy8eT/z33s+TYAESHfPehuj6m8Z+NDYoc7EFWTRA22JMR4nB1sjYG6CWxA5ji14cz3HiRFTFGMke/r7205ZModqcPguPIHRNo0tAl7R+r7XxQkYBCOnLlhZzEEelUCo/DplRfdmuH+zui8setBDGdHeJKwVkl6fWkm7S08f876JA40Sc/77IiNrGH4sor4JuKA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none To: "cygwin AT cygwin DOT com" Subject: Re: Failed assertion dialog box ATTN: Takashi Yano Thread-Topic: Failed assertion dialog box ATTN: Takashi Yano Thread-Index: AQHWvn9MaFEGdGARrUqp6YKkZoKbo6nPxxMAgAA10Uw= Date: Thu, 19 Nov 2020 21:53:05 +0000 Message-ID: References: <20201114034504 DOT GD2905 AT dimstar DOT local DOT net> <20201115044613 DOT GE2905 AT dimstar DOT local DOT net> , <6d8262e3-4206-a05b-5252-f77bef27b0db AT towo DOT net> In-Reply-To: <6d8262e3-4206-a05b-5252-f77bef27b0db@towo.net> Accept-Language: fr-CA, en-US Content-Language: fr-CA X-MS-Has-Attach: X-MS-TNEF-Correlator: x-incomingtopheadermarker: OriginalChecksum:6350626E4C5E5E1FC40B8C202C7FF018CB25E7F3F0236B03478545A21BE56688; 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charset="iso-8859-1" Sender: "Cygwin" Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id 0AJLrasm016844 De : Cygwin de la part de Thomas Wolff Envoyé : 19 novembre 2020 13:30 À : cygwin AT cygwin DOT com Objet : Re: Failed assertion dialog box ATTN: Takashi Yano   --------------------------------------------------------------------------------------- Am 19.11.2020 um 15:21 schrieb André Bleau via Cygwin: > ... > Here's some more info: > > It seems the bug is related to pseudo-console support; that explains why it is Windows 10 specific. > > Experiment: > > CYGWIN=disable_pcon /usr/bin/mintty & > > In the newly created window: > > $ ./a.exe output.txt 2>&1 > Aborted (core dumped) > > No message box popup. > > $ cat output.txt > assertion "false" failed: file "assert.cpp", line 3, function: int main() > > In the original mintty window, with empty CYGWIN env variable: > > $ ./a.exe output.txt 2>&1 > Aborted (core dumped) > > A message box pops > > AND: > > $ cat output.txt > >   output.txt  is empty > > So, 2 problems here. > > In a CMD Window: > > set path=%PATH%D:\Cygwin\bin; > a.exe outcmd.txt 2>&1 >        1 [main] a 759 cygwin_exception::open_stackdumpfile: Dumping stack trace to a.exe.stackdump > > type outcmd.txt > assertion "false" failed: file "assert.cpp", line 3, function: int main() >        1 [main] a 759 cygwin_exception::open_stackdumpfile: Dumping stack trace to a.exe.stackdump > > The bug could be in cygwin or in mintty. Maybe this is something that Thomas Wolff (mintty author) or Takashi Yano  (pseudo-console support expert) would want to look at. > --------------------------------------------------------------------------------------- > > OK, I opened an issue for mintty and it was quickly closed with that quote: > > "Quick generic answer: if it's caused by ConPTY support, it's not related to mintty; also mintty never shows any popups. > Funny thing, though, but really: assert isn't handled by the terminal." > > So the issue can only be with pseudo-console support in cygwin. It does not seem to happen in xterm which is weird. It does however also happen in rxvt-unicode, xfce4-terminal, and vte. The message text of the popup can be easily found in cygwin code. Thomas --------------------------------------------------------------------------------------- One more data point: The following program: $ cat stderr.c #include int main() { fprintf(stdout, "To stdout\n"); fprintf(stderr, "To stderr\n"); return 0; } $ gcc stderr.c $ ./a.exe output.txt 2>&1 Behaves normally, with either empty CYGWIN env variable or with $ CYGWIN=disable_pcon /usr/bin/mintty & So the problem is narrowly confined to how Cygwin handles assert when pseudo-console is used and stdin, stdout, and stderr are redirected. Not in all cases where pseudo-console is used and stdin, stdout, and stderr are redirected. - André Bleau -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple