Something strange is happening here.  When I try to build zsh with
"apt-get source -b zsh" in an xterm, during the tests zsh rapidly prints
the following messages over and over until it is killed:

,----
| (eval):4: write error: inappropriate ioctl for device
| (eval):print:4: write error: broken pipe
`----

These are the final messages after I killed the runaway zsh process:

,----
| (eval):4: write error: inappropriate ioctl for device
| (eval):print:4: write error: broken pipe
| Was testing: Bug regression: piping to anonymous function; piping to backround function
| ../../Test/A05execution.ztst: test failed.
| The following may (or may not) help identifying the cause:
|   This test checks for two different bugs, a parser segfault piping to an
|   anonymous function, and a descriptor leak when backgrounding a pipeline
| Makefile:187: recipe for target 'check' failed
| make[2]: *** [check] Interrupt
| Makefile:263: recipe for target 'test' failed
| make[1]: *** [test] Interrupt
| dh_auto_test: make -j2 test VERBOSE=1 died with signal 2
| debian/rules:52: recipe for target 'build-arch' failed
| make: *** [build-arch] Interrupt
| dpkg-buildpackage: error: debian/rules build died from signal 2
| E: Build command 'cd zsh-5.3.1 && dpkg-buildpackage -b -uc' failed.
`----

Note that this problem does _not_ manifest itself when running
dpkg-buildpackage -b directly instead of under apt-get's control.

By piping the output through tee(1) I could capture the messages before
the endless loop and saw this test failure:

,----
| Running test: Bug regression: piping to anonymous function; piping to backround function
| Pattern match failed:
| <\[<->\] <-> <->
| >[7] 10380 10381
| >[7]  + 10380 running    ( while :; do; print "This is a line"; done; ) |
| >       10381 done       () { ... }
| Test ../../Test/A05execution.ztst failed: output differs from expected as shown above for:
|   { setopt MONITOR } 2>/dev/null
|   if [[ -o MONITOR ]]
|   then
|    ( while :; do print "This is a line"; done ) | () : &
|    sleep 1
|    jobs -l
|   else
|    print -u $ZTST_fd "Skipping pipe leak test, requires MONITOR option"
|    print "[0] 0 0"
|   fi
| Error output:
| (eval):print:4: write error: broken pipe
| (eval):4: write error: inappropriate ioctl for device
`----

Cheers,
       Sven

Hi Sven,

thanks for the bug report.

Sven Joachim wrote:

When I tried it with the soon to be uploaded zsh 5.4.2-3 (via
https://jenkins.grml.org/debian), I couldn't see these messages, but ...

... I still had a runaway zsh process started by the test suite
which filled up my /tmp/ rather quickly:

Excerpt from lsof output:

→ lsof | fgrep deleted | fgrep /tmp
zsh       12242                    abe  cwd       DIR               0,39         40  153609225 /tmp/zsh-867614/zsh-5.4.2/obj/Test/command.tmp (deleted)
zsh       12242                    abe  txt       REG               0,39    3108064  153599609 /tmp/zsh-867614/zsh-5.4.2/obj/Src/zsh (deleted)
zsh       12242                    abe    0r      REG               0,39          0  153617200 /tmp/zsh.ztst.5904/ztst.in (deleted)
zsh       12242                    abe    2w      REG               0,39 2659778560  153608419 /tmp/zsh.ztst.5904/ztst.terr (deleted)
                                                                         ^^^^^^^^^^ = 2.5 GB!

→ ps auxwww | fgrep 12242
abe      12242 99.8  0.0  35324  3020 pts/15   RN   16:02   6:55 ../Src/zsh +Z -f ../../Test/ztst.zsh ../../Test/A05execution.ztst

Since the log file already has been deleted, I couldn't (easily) look
into it, but I assume it has been filled with similar messages.

I can confirm that.

		Regards, Axel