Date: Thu, 4 Jan 2001 00:50:45 -0800 (PST) From: mheffner@vt.edu To: freebsd-gnats-submit@FreeBSD.org Subject: bin/24066: gdb can't detach from programs linked with libc_r Message-ID: <200101040850.f048ojJ64795@freefall.freebsd.org> Resent-Message-ID: <200101040900.f04901r65639@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 24066
>Category: bin
>Synopsis: gdb can't detach from programs linked with libc_r
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Jan 04 01:00:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Mike Heffner
>Release: 5-current
>Organization:
>Environment:
5.0-CURRENT #0: Tue Jan 2 19:45:37 EST 2001 i386
>Description:
Gdb can't detach from a program that's linked with libc_r. It gives the
message "ptrace: No such process". The same program linked with libc
can be attached/detached fine. The only way to quit gdb is to kill
it.
By sprinkling the code with printf()s it looks like variable
`inferior_pid' (which is passed to ptrace() when detaching) is getting
changed. For example, it'll go from say 41694 -> 172766. I tracked
it down to a location in gnu/usr.bin/binutils/gdb/freebsd-uthread.c
line 429:
inferior_pid = find_active_thread ();
Unfortunately, after that point it's over my head so I can't really
figure out where it's going wrong.
>How-To-Repeat:
Compile the following program:
main(){
printf("pid: %d\n", getpid());
while(1)
sleep(1);
}
twice with:
gcc -o test1 test.c
gcc -o test2 test.c -pthread
and try attaching/detaching from it, the first one will succeed, the
second won't.
>Fix:
Don't know.
>Release-Note:
>Audit-Trail:
>Unformatted:
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200101040850.f048ojJ64795>