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Date: Thu, 06 Jun 2013 18:31:01 +0100 From: David Howells <dhowells@...hat.com> To: Markus Trippelsdorf <markus@...ppelsdorf.de> Cc: dhowells@...hat.com, linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.cz> Subject: Re: Strange intermittent EIO error when writing to stdout since v3.8.0 Markus Trippelsdorf <markus@...ppelsdorf.de> wrote: > OSError: [Errno 5] Input/output error > > Basically 'emerge' just writes the build output to stdout in a loop: I've just upgraded to kernel-3.9.4-200.fc18.x86_64 and I'm now regularly seeing something very similar from the tee run by "fedpkg local" to log its output when building a cross-compiler gcc RPM: tee: standard output: Input/output error tee: write error Slapping strace on tee after the "Input/output error" line has occurred shows that tee is still running and still pushing lines from its stdin to the output named on its command line, but has ceased writing to its stdout. The stdout is (or was) a TTY that's either the communications channel to an xterm or the channel to an emacs buffer. With the xterm, the process can be suspended (CTRL+Z) stuff can be written to the tty and then the process can be rstarted. Indeed, stderr for tee goes to the same tty - and must still be functional otherwise I wouldn't see the aforementioned error messages... In ps fax, the tee process can be seen at the bottom of the subtree: 5158 ? S 0:06 \_ /usr/bin/xterm 5198 pts/3 Ss+ 0:00 | \_ bash 5386 pts/3 Sl 4:50 | \_ emacs -geometry 100x77 10258 pts/8 SNs+ 0:00 | \_ /usr/bin/python /usr/bin/fedpkg local 10267 pts/8 SN+ 0:00 | \_ rpmbuild --define _sourcedir /dat 10462 pts/8 SN+ 0:00 | | \_ /bin/sh -e /var/tmp/rpm-tmp.x 16248 pts/8 SN+ 0:00 | | \_ make -j12 16249 pts/8 SN+ 0:00 | | \_ /bin/sh -c fail= fail 16253 pts/8 SN+ 0:00 | | \_ /bin/sh -c fail= 16254 pts/8 SN+ 0:00 | | \_ make all-am 16256 pts/8 SN+ 0:00 | | \_ /bin/sh - 16265 pts/8 SN+ 0:00 | | | \_ /bin/ 16688 pts/8 SN+ 0:00 | | | \_ / 16700 pts/8 RN+ 0:00 | | | 16704 pts/8 SN+ 0:00 | | | 16267 pts/8 SN+ 0:00 | | \_ /bin/sh - 16279 pts/8 SN+ 0:00 | | | \_ /bin/ 16694 pts/8 SN+ 0:00 | | | \_ / 16707 pts/8 RN+ 0:00 | | | 16713 pts/8 SN+ 0:00 | | | 16289 pts/8 SN+ 0:00 | | \_ /bin/sh - 16306 pts/8 SN+ 0:00 | | | \_ /bin/ 17045 pts/8 SN+ 0:00 | | | \_ / 17046 pts/8 RN+ 0:00 | | | 17047 pts/8 SN+ 0:00 | | | 16799 pts/8 SN+ 0:00 | | \_ /bin/sh - 16801 pts/8 SN+ 0:00 | | | \_ /bin/ 17051 pts/8 SN+ 0:00 | | | \_ / 17053 pts/8 RN+ 0:00 | | | 16819 pts/8 SN+ 0:00 | | \_ /bin/sh - 16822 pts/8 SN+ 0:00 | | | \_ /bin/ 16943 pts/8 SN+ 0:00 | | | \_ / 16950 pts/8 RN+ 0:00 | | | 16951 pts/8 SN+ 0:00 | | | 16903 pts/8 SN+ 0:00 | | \_ /bin/sh - 16915 pts/8 SN+ 0:00 | | \_ /bin/ 17024 pts/8 SN+ 0:00 | | \_ / 17026 pts/8 RN+ 0:00 | | 17028 pts/8 SN+ 0:00 | | 10268 pts/8 SN+ 0:00 | \_ tee .build-4.8.1-1.1.fc20.log tee's fds look like: warthog>ls -l /proc/10268/fd/ total 0 lr-x------. 1 dhowells dhowells 64 Jun 6 18:24 0 -> pipe:[1595614] lrwx------. 1 dhowells dhowells 64 Jun 6 18:24 1 -> /dev/pts/8 lrwx------. 1 dhowells dhowells 64 Jun 6 18:23 2 -> /dev/pts/8 l-wx------. 1 dhowells dhowells 64 Jun 6 18:24 3 -> /data/fedora/cros David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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