From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin@cygwin.com
Cc: Alexey Izbyshev <izbyshev@ispras.ru>
Subject: Re: Deadlock of the process tree when running make
Date: Sun, 10 Apr 2022 01:57:53 +0900 [thread overview]
Message-ID: <20220410015753.753e2a238513eaf2a3da81e9@nifty.ne.jp> (raw)
In-Reply-To: <907ce1b4416a826cb07990dd601bd687@ispras.ru>
On Sat, 09 Apr 2022 19:07:08 +0300
Alexey Izbyshev wrote:
> On 2022-04-09 14:46, Takashi Yano wrote:
> > On Sat, 09 Apr 2022 14:02:38 +0300
> > Alexey Izbyshev wrote:
> >>
> >> 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.
>
> ProcessHacker showed that the owner of the pcon mutex is bash.exe with
> (Windows) PID 6276. However, Cygwin ps doesn't list such a process. Its
> parent, however, has a Cygwin PID 37961 and is in the hanging tree:
>
> make(32651)-+-make(32656)-+-bash(37296)---find(38057)
> | |-bash(37632)---find(38061)
> | |-bash(37415)---find(38064)
> | |-bash(37852)---find(38062)
> | |-bash(37896)---find(38063)
> | `-bash(37961)---javac(38032)
>
> `-make(32657)-+-bash(38025)---bash(38054)---bash(38055)---readlink(38056)
>
> `-bash(37722)---bash(37825)---bash(38058)-+-grep(38060)
>
> `-grep(38059)
>
> Since javac(38032) is a zombie, my guess is that missing bash.exe (win
> 6276) is an intermediate process that Cygwin created when bash(37961)
> forked to run javac.
>
> bash.exe (win 6276) has two threads. The first one is blocked at
> ClosePseudoConsole() (which according to stack trace eventually calls
> NtWaitForSingleObject()) [1] and the second one is at [2].
>
> [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#l3615
>
> [2]
> https://cygwin.com/git?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/sigproc.cc;h=02d875a7fc947d628ca933690ed43ef03d767d53;hb=cygwin-3_3_4-release#l1359
>
> Hope this is helpful,
Thank you very much for the information. Can you check if
the thread pty_master_fwd_thread() in root mintty is still
alive?
--
Takashi Yano <takashi.yano@nifty.ne.jp>
next prev parent reply other threads:[~2022-04-09 16:58 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-07 21:53 Alexey Izbyshev
2022-04-07 23:54 ` Brian Inglis
2022-04-08 8:42 ` Alexey Izbyshev
2022-04-08 17:04 ` Brian Inglis
2022-04-11 13:27 ` Alexey Izbyshev
2022-04-09 10:17 ` Takashi Yano
2022-04-09 11:00 ` Alexey Izbyshev
2022-04-09 11:02 ` Alexey Izbyshev
2022-04-09 11:46 ` Takashi Yano
2022-04-09 16:07 ` Alexey Izbyshev
2022-04-09 16:57 ` Takashi Yano [this message]
2022-04-09 17:23 ` Alexey Izbyshev
2022-04-09 17:54 ` Takashi Yano
2022-04-09 19:35 ` Alexey Izbyshev
2022-04-09 20:26 ` Alexey Izbyshev
2022-04-10 7:34 ` Takashi Yano
2022-04-10 12:13 ` Alexey Izbyshev
2022-04-10 20:49 ` Alexey Izbyshev
2022-04-11 8:35 ` Takashi Yano
2022-04-11 10:10 ` Alexey Izbyshev
2022-04-13 16:48 ` Alexey Izbyshev
2022-04-13 17:22 ` Takashi Yano
2022-04-13 17:27 ` Alexey Izbyshev
2022-04-13 23:17 ` Alexey Izbyshev
2022-04-16 9:39 ` Takashi Yano
2022-04-16 13:21 ` Alexey Izbyshev
2022-04-27 11:22 ` Takashi Yano
2022-04-27 12:19 ` Alexey Izbyshev
2022-04-11 5:23 ` Jeremy Drake
2022-04-11 8:36 ` Takashi Yano
2022-04-11 15:28 ` Alexey Izbyshev
2022-04-11 17:02 ` Jeremy Drake
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