Comment 15 for bug 1962454

Tested on focal. Test script:

```
#!/bin/sh
set -u

log() {
 local msg="$1"
 echo "I: $msg"
 sudo sh -c "echo '$msg' > /dev/kmsg"
}

sudo rm /var/crash/*

date
log "some messages"
sleep 1
log "more messages"
sleep 3600 &
killall -11 sleep
log 'message after crash'
sleep 5
log 'message 5 seconds after crash'
sleep 10
log 'message 10 seconds after crash'
```

Steps:
* Run the test script
* Close the Apport crash window
* Wait > 10 seconds
* `ubuntu-bug /var/crash/_usr_bin_sleep.1000.crash`

Verified 2.20.11-0ubuntu27.25 for focal: https://errors.ubuntu.com/oops/b6e647e1-6a79-11ed-a977-fa163e55efd0