** Description changed: + This section is for Focal SRU purpose + + [Impact] + From https://ftp.gnu.org/gnu/bash + There were cases where bash 5.0 patch 16 reaped process substitution file descriptors (or FIFOs) and processes to early. This is a better fix for the problem that bash50-016 attempted to solve. + + [Test Case] + This simple bash script pass when bash with patch 017 is installed + Recommend to run it before and after installing the update to notice the difference + + ``` + #!/usr/bin/bash + + ouch() { + cat < <(echo bar) + cat "$1" + } + + ouch2() { + { cat; } < <(echo bar) + cat "$1" + } + + ouch <(echo "foo") + ouch2 <(echo "foo") + ``` + Expected output with the patch installed: + + foo + bar + foo + bar + + [Regression Potential] + This is an upstream patch level update with no additional modification. The regression potential should be fairly low. Also the patch is intended to only fix this problem. + Possible regression would be unforeseen additional process substitutions that upstream bash would share. + + End SRU + ------ + Original Bug Description: + I am using Ubuntu 20.04 for development and has hit a bug in bash 5.0 patch 16. I can't reproduce it in pure bash, but with bats from https://github.com /bats-core/bats-core/ it is very easy to repro: ``` # cat << EOF > ya.bats check() { - echo "check $@" - ls -l /proc/self/fd + echo "check $@" + ls -l /proc/self/fd } @test "here file" { - check -p <(echo "hey") - false + check -p <(echo "hey") + false } EOF $ bats ya.bats ``` Normally the output should contain the line - lr-x------ 1 kir kir 64 May 14 02:01 63 -> pipe:[4616918] + lr-x------ 1 kir kir 64 May 14 02:01 63 -> pipe:[4616918] which is a result of a "here file" created by bash via <(echo "hey"). In my testing, about 50% of runs don't have /dev/fd/63 listed. I found out this is a manifest of a bug introduced in bash 5.0 patch 16 (see http://ftp.gnu.org/gnu/bash/bash-5.0-patches/bash50-016) The bug is fixed in 5.0 patch 17 (see http://ftp.gnu.org/gnu/bash/bash-5.0-patches/bash50-017). Please update bash to patchlevel 17.
** Patch added: "debdiff for focal SRU" https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1878517/+attachment/5386580/+files/bash-5.0-6ubuntu1.1-focal.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1878517 Title: please apply bash 5.0 patch 17 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1878517/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
