The race is in do-while loop in wait_for(). At the start of wait_for()
we are blocking SIGCHLD, however echo process ends during the loop and
we don't register it (don't handle SIGCHLD, which is sent).
Looking at the code, there is MUST_UNBLOCK_CHLD. May it make any harm to
enable it by default?
RR
On 05/24/2013 02:12 PM, Roman Rakus wrote:
I have done a bit of debugging and have some results:
The problem is that waitchld is called even if there aren't any children
running. The waitchld() is called more then once. I don't know what is
the logic behind it.
Will check, if there is any child, helps?
RR
On 05/20/2013 04:11 PM, Roman Rakus wrote:
Bash hangs in wait4() (WAITPID) if TERM signal trap handler is executed
during execution of pipeline.
RR
Reproducer:
#!/bin/bash
trap "/bin/echo trapped $$" TERM
printf '%d\n' $$
while :; do
dd if=/dev/zero bs=1k count=128 2>&1 | cat > /dev/null
done
and bombard the bash process with TERM signals:
#!/bin/bash
while :; do
kill -TERM $1 || break
usleep 100000
done
