Re: bash pipe redirection gets stuck
long at rule.lv writes: Dear all, I stumbled upon a problem where multiple pipe redirection occasionally get stuck when trying to get sha256 sum of a stream. You can try to reproduce the problem if you have /usr/ports/shells/bash installed (output redirection used in this command is possible only in bash). Create temporary test file with command: dd if=/dev/urandom of=/tmp/file1 bs=1k count=10 And the command I'm using is: /usr/local/bin/bash -c 'cat /tmp/file1 | tee (/sbin/sha256 /tmp/file1.sha256) /tmp/file1.copy' ; echo $status I could reproduce it on FreeBSD 9.0-RELEASE-p3 on 3rd try, but after upgrade of bash-4.1.11 to bash-4.2.37 it works (tested 30 times). jb ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
bash pipe redirection gets stuck
Dear all, I stumbled upon a problem where multiple pipe redirection occasionally get stuck when trying to get sha256 sum of a stream. You can try to reproduce the problem if you have /usr/ports/shells/bash installed (output redirection used in this command is possible only in bash). Create temporary test file with command: dd if=/dev/urandom of=/tmp/file1 bs=1k count=10 And the command I'm using is: /usr/local/bin/bash -c 'cat /tmp/file1 | tee (/sbin/sha256 /tmp/file1.sha256) /tmp/file1.copy' ; echo $status Command gets stuck about once in 20 executions. top output when command gets stuck (irrelevant processes removed): PID USERNAMETHR PRI NICE SIZERES STATE C TIME WCPU COMMAND 84073 HappyUser 1 520 17612K 2268K wait0 0:00 0.00% bash 84154 HappyUser 1 520 10084K 844K fifoow 1 0:00 0.00% tee And more strangely, I can reproduce this problem on 9.0-RELEASE and 7.4-RELEASE-p6, but couldn't reproduce on 8.2-RELEASE-p4. Thanks for any pointers/explanations, Normunds ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: bash pipe redirection gets stuck
On Mon, 3 Dec 2012 16:35:15 +0200 (EET) l...@rule.lv articulated: Dear all, I stumbled upon a problem where multiple pipe redirection occasionally get stuck when trying to get sha256 sum of a stream. You can try to reproduce the problem if you have /usr/ports/shells/bash installed (output redirection used in this command is possible only in bash). Create temporary test file with command: dd if=/dev/urandom of=/tmp/file1 bs=1k count=10 And the command I'm using is: /usr/local/bin/bash -c 'cat /tmp/file1 | tee (/sbin/sha256 /tmp/file1.sha256) /tmp/file1.copy' ; echo $status Command gets stuck about once in 20 executions. top output when command gets stuck (irrelevant processes removed): PID USERNAMETHR PRI NICE SIZERES STATE C TIME WCPU COMMAND 84073 HappyUser 1 520 17612K 2268K wait0 0:00 0.00% bash 84154 HappyUser 1 520 10084K 844K fifoow 1 0:00 0.00% tee And more strangely, I can reproduce this problem on 9.0-RELEASE and 7.4-RELEASE-p6, but couldn't reproduce on 8.2-RELEASE-p4. Thanks for any pointers/explanations, Normunds For starters, what version of Bash? FreeBSD is still a few patches behind the current patch level, so that is also a possibility. I would suggest you visit: https://lists.gnu.org/mailman/listinfo/bug-bash, subscribe to the list and then ask your question bug-b...@gnu.org. -- Jerry ♔ Disclaimer: off-list followups get on-list replies or get ignored. Please do not ignore the Reply-To header. __ Communicate! It can't make things any worse. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: bash pipe redirection gets stuck
On 03.12.12 15:35, l...@rule.lv wrote: [...] I stumbled upon a problem where multiple pipe redirection occasionally get stuck when trying to get sha256 sum of a stream. You can try to reproduce the problem if you have /usr/ports/shells/bash installed (output redirection used in this command is possible only in bash). Create temporary test file with command: dd if=/dev/urandom of=/tmp/file1 bs=1k count=10 And the command I'm using is: /usr/local/bin/bash -c 'cat /tmp/file1 | tee (/sbin/sha256 /tmp/file1.sha256) /tmp/file1.copy' ; echo $status Command gets stuck about once in 20 executions. top output when command gets stuck (irrelevant processes removed): PID USERNAMETHR PRI NICE SIZERES STATE C TIME WCPU COMMAND 84073 HappyUser 1 520 17612K 2268K wait0 0:00 0.00% bash 84154 HappyUser 1 520 10084K 844K fifoow 1 0:00 0.00% tee And more strangely, I can reproduce this problem on 9.0-RELEASE and 7.4-RELEASE-p6, but couldn't reproduce on 8.2-RELEASE-p4. It maybe couldn't gather more randomness from /dev/random? The random(4) manpage suggests that there's (theoretically) indeed a chance that it blocks - see the section about 'kern.random.sys.seeded'. So in fact - when you think the command gets stuck - it's probably not bash related at all. cheers, Frank Reppin -- 43rd Law of Computing: Anything that can go wr fortune: Segmentation violation -- Core dumped ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: bash pipe redirection gets stuck
long at rule.lv writes: Dear all, I stumbled upon a problem where multiple pipe redirection occasionally get stuck when trying to get sha256 sum of a stream. You can try to reproduce the problem if you have /usr/ports/shells/bash installed (output redirection used in this command is possible only in bash). Create temporary test file with command: dd if=/dev/urandom of=/tmp/file1 bs=1k count=10 And the command I'm using is: /usr/local/bin/bash -c 'cat /tmp/file1 | tee (/sbin/sha256 /tmp/file1.sha256) /tmp/file1.copy' ; echo $status ... Do you get stuck with this ? Does it make any difference ? /usr/local/bin/bash -c 'cat /tmp/file1 | tee /tmp/file1.copy | /sbin/sha256 \ /tmp/file1.sha256' ; echo $status jb ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: bash pipe redirection gets stuck
jb jb.1234abcd at gmail.com writes: ... Do you get stuck with this ? Does it make any difference ? I missed a redirector - sorry about that; the entry should be: /usr/local/bin/bash -c 'cat /tmp/file1 | tee /tmp/file1.copy | /sbin/sha256 \ /tmp/file1.sha256' ; echo $status jb ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: bash pipe redirection gets stuck
On 03.12.12 15:35, l...@rule.lv wrote: [...] I stumbled upon a problem where multiple pipe redirection occasionally get stuck when trying to get sha256 sum of a stream. You can try to reproduce the problem if you have /usr/ports/shells/bash installed (output redirection used in this command is possible only in bash). Create temporary test file with command: dd if=/dev/urandom of=/tmp/file1 bs=1k count=10 And the command I'm using is: /usr/local/bin/bash -c 'cat /tmp/file1 | tee (/sbin/sha256 /tmp/file1.sha256) /tmp/file1.copy' ; echo $status Command gets stuck about once in 20 executions. top output when command gets stuck (irrelevant processes removed): PID USERNAMETHR PRI NICE SIZERES STATE C TIME WCPU COMMAND 84073 HappyUser 1 520 17612K 2268K wait0 0:00 0.00% bash 84154 HappyUser 1 520 10084K 844K fifoow 1 0:00 0.00% tee And more strangely, I can reproduce this problem on 9.0-RELEASE and 7.4-RELEASE-p6, but couldn't reproduce on 8.2-RELEASE-p4. It maybe couldn't gather more randomness from /dev/random? The random(4) manpage suggests that there's (theoretically) indeed a chance that it blocks - see the section about 'kern.random.sys.seeded'. So in fact - when you think the command gets stuck - it's probably not bash related at all. cheers, Frank Reppin -- 43rd Law of Computing: Anything that can go wr fortune: Segmentation violation -- Core dumped Thanks for your answer, but randomly generated file is created fine (it is only for illustrative purpose). As far as I understand, thing that blocks is tee inside bash command or pipeline. Thanks and best regards, Normunds ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
