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From: Jan Beich <jbeich@tormail.org>
To: Jilles Tjoelker <jilles@stack.nl>
Subject: Re: r247839: broken pipe - for top, sudo and ports
In-Reply-To: <20130306212408.GA15814@stack.nl> (Jilles Tjoelker's message of
 "Wed, 6 Mar 2013 22:24:08 +0100")
Date: Thu, 07 Mar 2013 04:54:01 -0100
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Cc: Davide Italiano <davide@FreeBSD.org>, Dimitry Andric <dim@FreeBSD.org>,
 FreeBSD Current <freebsd-current@freebsd.org>, "Hartmann,
 O." <ohartman@zedat.fu-berlin.de>
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Jilles Tjoelker <jilles@stack.nl> writes:

> On Tue, Mar 05, 2013 at 08:59:09PM +0100, Hartmann, O. wrote:
>
>> A "truss top" reveals this, is this of help?
>
>> [...]
>> stat("/etc/nsswitch.conf",{ mode=-rw-r--r--
>> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0)
>> stat("/etc/nsswitch.conf",{ mode=-rw-r--r--
>> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0)
>> stat("/etc/nsswitch.conf",{ mode=-rw-r--r--
>> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0)
>> stat("/etc/nsswitch.conf",{ mode=-rw-r--r--
>> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0)
>> stat("/etc/nsswitch.conf",{ mode=-rw-r--r--
>> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0)
>> socket(PF_LOCAL,SOCK_STREAM,0)                   = 4 (0x4)
>> connect(4,{ AF_UNIX "/var/run/nscd" },15)        = 0 (0x0)
>> fcntl(4,F_SETFL,O_NONBLOCK)                      = 0 (0x0)
>> kqueue(0x80183b000,0x80122fc58,0x10,0x80062b308,0x80183b010,0x2) = 5 (0x5)
>> kevent(5,{0x4,EVFILT_WRITE,EV_ADD,0,0x0,0x0},1,0x0,0,0x0) = 0 (0x0)
>> kqueue(0x5,0x7fffffffd2e0,0x1,0x0,0x0,0x0)       = 6 (0x6)
>> kevent(6,{0x4,EVFILT_READ,EV_ADD,0,0x0,0x0},1,0x0,0,0x0) = 0 (0x0)
>> kevent(5,{0x4,EVFILT_WRITE,EV_ADD,1,0x4,0x0},1,0x0,0,0x0) = 0 (0x0)
>> kevent(5,0x0,0,{0x4,EVFILT_WRITE,EV_EOF,0,0x2000,0x0},1,0x0) = 1 (0x1)
>> sendmsg(0x4,0x7fffffffd290,0x0,0x1,0x1,0x0)      ERR#32 'Broken pipe'
>> SIGNAL 13 (SIGPIPE)
>> process exit, rval = 0
>
> Apparently there is a bug that causes nscd to close the connection
> immediately but even then it is wrong that this terminates the calling
> program with SIGPIPE.
>
> The below patch prevents the SIGPIPE but cannot revive the connection to
> nscd. This may cause numeric UIDs in top or increase the load on the
> directory server. It is compile tested only.
[...]

The patch seems to fix the issue in a world after r247804. I don't see
numeric UIDs in top but without the patch top crashes with SIGPIPE a lot
less frequently than sudo or make install (in base/ports) for me.

In my case shutting down nscd helped, too. Compared to stock
nsswitch.conf I only have "cache" added.