Bug 3525

process attached; response:

FINE: frysk.sys.Wait pid 2835 status 0x137f WIFSTOPPED 19 (Stopped (signal))
FINE: frysk.sys.Wait pid 0 errno 0 (Success)

process sent signal telling it to do exec:

FINE: frysk.sys.Wait pid 2835 status 0x1e7f WIFSTOPPED 30 (Power failure)
FINE: frysk.sys.Wait pid 0 errno 0 (Success)

process continued with signal; so exec of "exit 47" program occures:

FINE: frysk.sys.Wait pid 2835 status 0x4057f WIFSTOPPED/EXEC 5 (Trace/breakpoint
trap)
FINE: frysk.sys.Wait pid 0 errno 0 (Success)

process stopped at exec allowed to continue; process exits:

FINE: frysk.sys.Wait pid 2835 status 0x6057f WIFSTOPPED/EXIT 5 (Trace/breakpoint
trap)
FINE: frysk.sys.Wait pid 0 errno 0 (Success)

and then process really exits twice!

FINE: frysk.sys.Wait pid 2835 status 0x2f WIFSIGNALED 47 (Real-time signal 13)
FINE: frysk.sys.Wait pid 2835 status 0x2f00 WIFEXITED 47 (exit status)
FINE: frysk.sys.Wait pid -1 errno 10 (No child processes)

Note that the frysk process has its own special ptrace thread; i.e., the wait
and ptrace operations are occuring in _different_ threads.

Test case frysk-imports/tests/frysk3525 created; good output:

30389 installing signal handler and mask
30389 forking
30391 signalling 30389 with User defined signal 1
30391 waiting for signals
30389 calling waitpid 30390 for << child for daemon exits >> returns 0x0
WIFEXITED 0 -- ok
30389 waiting for signals
30389 received User defined signal 1
30389 calling ptrace 16 (ATTACH) 30391 0
30389 calling waitpid 30391 for << daemon attached >> returns 0x137f WIFSTOPPED
19 -- ok30389 calling ptrace 21 (SETOPTIONS) 30391 80
30389 calling ptrace 7 (CONT) 30391 10
30389 calling waitpid 30391 for << daemon stops at exec >>30391 received User
defined signal 1
 returns 0x4057f WIFSTOPPED 5 -- ok
30389 calling ptrace 7 (CONT) 30391 0
30389 calling waitpid 30391 for << daemon stops at exit(47) >>30391 argc 3 0 47
exiting 30391 with 47
 returns 0x6057f WIFSTOPPED 5 -- ok
30389 calling ptrace 7 (CONT) 30391 0
30389 calling waitpid 30391 for << daemon does exit(47) >> returns 0x2f00
WIFEXITED 47 -- ok
30389 calling waitpid 30391 for << no children >> fails (No child processes) -- ok

vs bad output (from FC5.18):

24081 installing signal handler and mask
24081 forking
24083 signalling 24081 with User defined signal 1
24083 waiting for signals
24081 calling waitpid 24082 for << child for daemon exits >> returns 0x0
WIFEXITED 0 -- ok
24081 waiting for signals
24081 received User defined signal 1
24081 calling ptrace 16 (ATTACH) 24083 0
24081 calling waitpid 24083 for << daemon attached >> returns 0x137f WIFSTOPPED
19 -- ok
24081 calling ptrace 21 (SETOPTIONS) 24083 80
24081 calling ptrace 7 (CONT) 24083 10
24081 calling waitpid 24083 for << daemon stops at exec >>24083 received User
defined signal 1
 returns 0x4057f WIFSTOPPED 5 -- ok
24081 calling ptrace 7 (CONT) 24083 0
24081 calling waitpid 24083 for << daemon stops at exit(47) >>24083 argc 3 0 47
exiting 24083 with 47
 returns 0x6057f WIFSTOPPED 5 -- ok
24081 calling ptrace 7 (CONT) 24083 0
24081 calling waitpid 24083 for << daemon does exit(47) >> returns 0x2f
WIFSIGNALED 47 -- WIFEXITED 47 expected
Aborted (core dumped)

Down stream FC6 bug:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=216020

Testcase committed, set to must pass.

*** Bug 3489 has been marked as a duplicate of this bug. ***

*** Bug 3865 has been marked as a duplicate of this bug. ***