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bug#65324: "make check" hangs on NetBSD 9.3
From: |
Bruno Haible |
Subject: |
bug#65324: "make check" hangs on NetBSD 9.3 |
Date: |
Wed, 13 Sep 2023 21:17:25 +0200 |
Michael Albinus wrote:
> So I have rewitten it, and pushed it to Emacs master.
> ...
> So I exclude this special "ln -sf" call for NetBSD, such longuish file
> names shouldn't happen in the wild (I hope). See the reworked patch for
> tramp-tests.el.
With these two new files, the tramp part of "gmake check" terminates.
Find attached the log files.
> And NetBSD has restricted ressources, for example it
> reports PIPE_BUF being 512, where other systems report 4096 ...
If your code and tests depend on the value of PIPE_BUF, that explains it.
Whereas the maximum command line length (according to the libtool configure
test) is:
checking the maximum length of command line arguments... 196608
The PIPE_BUF in POSIX [1] can be as low as 512 [2]. Here are the values
on various platforms:
- 512 on macOS, FreeBSD, NetBSD, OpenBSD, MirBSD, native Windows.
- 4 KiB on Linux, OSF/1, Cygwin, Haiku.
- 5 KiB on Solaris.
- 8 KiB on HP-UX, Plan9.
- 10 KiB on IRIX.
- 32 KiB on AIX, Minix.
[1] https://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html
[2] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html
> such longuish file names shouldn't happen in the wild (I hope).
But the problem is:
- It's not only NetBSD. It's all *BSDs that have a PIPE_BUF value of 512.
- tramp seems not only to fail in this case, but to go into an endless loop,
which is much much worse.
Btw, I know that passing long commands through pipes is hard to implement.
A frequent mistake - that leads to endlessly hanging processes - is to leave
a file descriptor open in both the parent and the child process, when it
should only be open in one of the two.
Bruno
netbsd93-tramp-logs.tar.gz
Description: application/compressed-tar
- bug#65324: "make check" hangs on NetBSD 9.3, (continued)
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/04
- bug#65324: "make check" hangs on NetBSD 9.3, Bruno Haible, 2023/09/04
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/04
- bug#65324: "make check" hangs on NetBSD 9.3, Bruno Haible, 2023/09/04
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/05
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/11
- bug#65324: "make check" hangs on NetBSD 9.3, Bruno Haible, 2023/09/12
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/12
- bug#65324: "make check" hangs on NetBSD 9.3, Bruno Haible, 2023/09/12
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/13
- bug#65324: "make check" hangs on NetBSD 9.3,
Bruno Haible <=
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/14
- bug#65324: "make check" hangs on NetBSD 9.3, Michael Albinus, 2023/09/22