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Date:	Sat, 9 Apr 2022 20:46:19 +0900
From:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
To:	cygwin AT cygwin DOT com
Subject:	Re: Deadlock of the process tree when running make
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Cc:	Alexey Izbyshev <izbyshev AT ispras DOT ru>
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On Sat, 09 Apr 2022 14:02:38 +0300
Alexey Izbyshev wrote:
> On 2022-04-09 14:00, Alexey Izbyshev wrote:
> > On 2022-04-09 13:17, Takashi Yano wrote:
> > 
> >> Attaching gdb to the hanging process and dumping stack by 'bt'
> >> command for each thread may diagnose more detail.
> > 
> > I decided to simply look at assembly at the point shown in
> > ProcessHacker stack trace (cygwin1.dll!feinitialise+0x5ecab) to avoid
> > disturbing the process by gdb. And it's clear that the hang is in
> > fhandler_pty_slave::reset_switch_to_pcon() at [1]. I've checked that
> > there were some changes in that function since 3.3.4. Could they fix
> > this deadlock?
> > 
> > [1] 
> > https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/fhandler_tty.cc;h=7bef6958c106c5e78cc90e014081022fd3a205bc;hb=cygwin-3_3_4-release
> > 
> 
> Missed the line in the link above: 
> https://cygwin.com/git?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/fhandler_tty.cc;h=7bef6958c106c5e78cc90e014081022fd3a205bc;hb=cygwin-3_3_4-release#l1199

Thanks for finding that. It would be very helpfull if you could
find another process which holds pcon_mutex and where it is stopping.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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