[SSI-devel] [ ssic-linux-Bugs-2010453 ] OpenSSI fails the glibc tst-basic3 test

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Bugs item #2010453, was opened at 2008-07-04 11:32
Message generated for change (Comment added) made by hughesj
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>Category: Process Management
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: John Hughes (hughesj)
Assigned to: Nobody/Anonymous (nobody)
Summary: OpenSSI fails the glibc tst-basic3 test

Initial Comment:
The test starts some threads; waits for them to exit then sends a signal.  It complains that the signal is not received.

$ cc -pthread tst-basic3.c
$ ./a.out
starting 20 + 1 threads
20 left
19 left
18 left
17 left
16 left
15 left
14 left
13 left
12 left
11 left
10 left
 9 left
 8 left
 7 left
 6 left
 5 left
 4 left
 3 left
 2 left
 1 left
 0 left
final_test has been called
Expected signal 'User defined signal 1' from child, got none


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>Comment By: John Hughes (hughesj)
Date: 2008-07-04 12:17

Message:
Logged In: YES 
user_id=166336
Originator: YES

Excerpts from trace:

69921 execve("./a.out", ["./a.out"], [/* 15 vars */]) = 0
[...]
69921 write(2, "Start main pid 69921\n", 21) = 21
69921 clone(child_stack=0,
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0xb7db8708) = 69922
[ that "clone" is a fork ]
69921 waitpid(69922,  <unfinished ...>
[...]
69922 write(2, "test running as pid 69922\n", 26) = 26
69922 clone(child_stack=0xb7db74c4,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED,
parent_tidptr=0xb7db7bf8, {entry_number:6, base_addr:0xb7db7bb0,
limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
seg_not_present:0, useable:1}, child_tidptr=0xb7db7bf8) = 69923
[ that "clone" is a pthread_create ]
[...]
69922 munmap(0xb75b1000, 27800)         = 0
69922 futex(0xb75b0be4, FUTEX_WAKE, 2147483647) = 0
69922 _exit(0) 
[ wierd, why is 69922 exiting, I'd expect it to be 69223 ]
69923 write(1, " 0 left in pid 69922\n", 21) = 21
69923 write(2, "final_test has been called from "..., 42) = 42
69923 kill(69922, SIGUSR1)              = -1 ESRCH (No such process)
69923 exit_group(0)

It looks like the thread is running in the wrong clone.



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Comment By: John Hughes (hughesj)
Date: 2008-07-04 12:12

Message:
Logged In: YES 
user_id=166336
Originator: YES

Here's what goes wrong:

69772 execve("./tst-basic3", ["./tst-basic3"], [/* 15 vars */]) = 0
[...]
69793 write(1, " 0 left\n", 8)          = 8
69793 write(1, "final_test has been called", 26) = 26
69793 write(1, "\n", 1)                 = 1
69793 kill(69773, SIGUSR1)              = -1 ESRCH (No such process)
69793 exit_group(0)                     = ?
69772 <... waitpid resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0) =
69773
69772 --- SIGCHLD (Child exited) @ 0 (0) ---
69772 futex(0xb7f409c0, FUTEX_WAKE, 2147483647) = 0
69772 write(2, "Expected signal \'User defined si"..., 61) = 61
69772 exit_group(1)                     = ?

I.e. the signal is being sent to the wrong process, 69773 instead of
69772.  Why?

The code is "kill (getpid(), SIGUSR1)"

Wierd, it looks like the group leader process is exiting, here's another
trace:

:q1


File Added: zz-strace

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