Package: dash
Version: 0.5.5.1-1
Severity: critical
Hello,
new dash has some serious problems with waiting on spawned
processes, which completely breaks apt-move - at the end apt-move spawns
pipe as shown below:
p...@gwy:~$ cat /tmp/err
20768 tty4 S+ 0:00 \_ dash /usr/bin/apt-move sync
21840 tty4 S+ 0:00 \_ sort
21841 tty4 S+ 0:00 \_ awk -f
/usr/share/apt-move/cmpbignum.awk -f /usr/share/apt-move/cmpversion.awk
-f /usr/share/apt-move/getdist.awk -f /usr/share/apt-move/get2
21843 tty4 S+ 0:00 \_ sort
21844 tty4 D+ 0:00 \_ /usr/bin/awk -f
/usr/share/apt-move/pkg1 /tmp/MOVE_lfwAkG/make_pkg_files-fifo1
/tmp/MOVE_lfwAkG/make_pkg_files-contents/unstable/main/binary-i386
21845 tty4 S+ 0:00 \_ gzip
21846 tty4 S+ 0:00 \_ tee
dists/unstable/main/binary-i386/Packages
/tmp/MOVE_lfwAkG/make_pkg_files-fifogz
Once 'tee' completes, it starts consuming 100% CPU, and can be killed
only by -9...
p...@gwy:~$ cat /tmp/err2
20768 tty4 R+ 0:02 \_ dash /usr/bin/apt-move sync
And strace shows that it is doing endless stream of calls to wait4(),
waiting for someone who does not exist anymore:
p...@gwy:~$ head -10 /tmp/err3
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
wait4(-1, 0xffd236e8, 0, NULL) = -1 ECHILD (No child processes)
p...@gwy:~$
I suspect that it could be same as bug 515064, but maybe not. In any
case, as far as I can tell, severity should be critical as it breaks
unrelated package (apt-move). Downgrading back to 0.5.4 fixes the problem.
Thanks,
Petr
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