dash "set -e" breaks "trap action INT"

I have reported this bug upstream and it has been confirmed.

http://<email address hidden>/msg00401.html

Apparently dash 0.5.6 fixes it, but releases up to Natty still use 0.5.5

This bug is... now different. But not fixed. Using Dash 0.5.8-2.10, the output I get from the script is:

3
^CEXIT
Ignored 1
Ignored 2
Back

Note that EXIT fires a lot earlier than expected, and the script unexpectedly terminates.

I still see similar behaviour to the original bug (only one line is executed) with this script:

#!/bin/sh
set -e

trap 'exit 1' INT
trap 'sorry' EXIT

sorry() {
  echo "Ignored 1"; echo "Ignored 2"
  sleep 1
  echo Back
}

for i in 3 2 1; do
    echo "$i"
    sleep 1 # || true
done

echo OUT

Expected output:

3
^CIgnored 1
Ignored 2
Back

Actual output:

3
^CIgnored 1

Output by dash 0.5.10.2-6:
3
^CIgnored 1
Ignored 2
Back
EXIT

bash 5.0.3 works the same way.

To get the output you want, you can use the following code:
--------------
#!/bin/sh
#set -e

trap '' INT
trap 'echo EXIT' EXIT

sorry() {
  echo "Ignored 1"; echo "Ignored 2"
  sleep 1
  echo Back
}

for i in 3 2 1; do
    echo "$i"
    (
  trap 'sorry; exit 0' INT
  sleep 1
    ) # || :
done

echo OUT
---------

If you use bash, instead of dash, it would work even if "set -e" was used and "trap '' INT" was not used. If "set -e" was used with dash, you would have to uncomment "|| :" to make it work.

See also Bug #892317

Status changed to 'Confirmed' because the bug affects multiple users.