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From "Travis Vitek (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (STDCXX-625) [IBM XLC++ 9.0/AIX 5.3] SIGSEGV in 0.process
Date Mon, 04 Feb 2008 18:13:08 GMT

    [ https://issues.apache.org/jira/browse/STDCXX-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12538970#action_12538970
] 

vitek edited comment on STDCXX-625 at 2/4/08 10:12 AM:
--------------------------------------------------------------

Note that this problem doesn't come up with a trivial testcase, I tried. It does happen when
using SIGCHLD and sleep(). It appears that it is implementation defined what the signal mask
is set to when the user signal handler is invoked. i.e. some platforms keep the same handler,
some reset it back to the default, and some others temporarily set it to something else and
then restore it after the handler has completed.

Attaching a testcase and patch.

{noformat}
2007-10-30  Travis Vitek  <vitek@roguewave.com>

	STDCXX-625
	* process.cpp (sig_handler): Don't re-register for signal from
	within signal handler to avoid stack overflow on HP-UX and AIX.
	(rw_waitpid): Set and restore signal handler inside loop so we
	can avoid using the signal handler to do it.
{noformat}

      was (Author: vitek):
    Note that this problem doesn't come up with a trivial testcase, I tried. It does happen
when using SIGCHLD and sleep(). It appears that it is implementation defined what the signal
mask is set to when the user signal handler is invoked. i.e. some platforms keep the same
handler, some reset it back to the default, and some others temporarily set it to something
else and then restore it after the handler has completed.

Attaching a testcase and patch.

2007-10-30  Travis Vitek  <vitek@roguewave.com>

	STDCXX-625
	* process.cpp (sig_handler): Don't re-register for signal from
	within signal handler to avoid stack overflow on HP-UX and AIX.
	(rw_waitpid): Set and restore signal handler inside loop so we
	can avoid using the signal handler to do it.
	
  
> [IBM XLC++ 9.0/AIX 5.3] SIGSEGV in 0.process
> --------------------------------------------
>
>                 Key: STDCXX-625
>                 URL: https://issues.apache.org/jira/browse/STDCXX-625
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: Tests
>    Affects Versions: 4.2.0
>         Environment: HP-UX or AIX platforms
>            Reporter: Travis Vitek
>            Assignee: Travis Vitek
>             Fix For: 4.2.1
>
>         Attachments: stdcxx-625.patch, test.cpp
>
>
> It appears that when we re-register for the signal from within the user signal handler
the user signal handler is immediately invoked again. This recursion causes a stack overflow
and a crash. Here is the stack on AIX....
> {noformat}
> sig_handler(int)( = 20), line 528 in "process.cpp"
> sigaction(??, ??, ??) at 0xd01fa358
> signal(??, ??) at 0xd02759a8
> sig_handler(int)( = 20), line 528 in "process.cpp"
> sigaction(??, ??, ??) at 0xd01fa358
> signal(??, ??) at 0xd02759a8
> sig_handler(int)( = 20), line 528 in "process.cpp"
> nsleep(??, ??) at 0xd01fa1d4
> sleep(??) at 0xd02051d4
> unnamed block $b656, line 553 in "process.cpp"
> rw_waitpid(long,int*,int)(pid = 782442, result = 0x2ff226a0, timeout = 5), line 553 in
"process.cpp"
> join_test(long,bool)(pid = 782442, should_hang = false), line 51 in "0.process.cpp"
> test_process_create1()(), line 109 in "0.process.cpp"
> run_test(int,char**)(argc = 1, argv = 0x2ff22a60), line 276 in "0.process.cpp"
> rw_vtest(int,char**,const char*,const char*,const char*,int(*)(int,char**),const char*,char*)(argc
= 1, argv = 0x2ff22a60, file_name = "/amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp",
clause = "0.process", comment = "", fun = 0x2000b85c, optstr = "|-child#0 |-timeout#", va
= " "), line 1030 in "driver.cpp"
> rw_test(int,char**,const char*,const char*,const char*,int(*)(int,char**),const char*,...)(argc
= 1, argv = 0x2ff22a60, fname = "/amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp",
clause = "0.process", comment = "", testfun = 0x2000b85c, optstr = "|-child#0 |-timeout#",
... = 0x20009608), line 1128 in "driver.cpp"
> main(argc = 1, argv = 0x2ff22a60), line 299 in "0.process.cpp"
> {noformat}
> Here is the stack on HP-UX
> {noformat}
> #0  sig_handler (No.Identifier=18) at /amd/devco/vitek/stdcxx-trunk/tests/src/process.cpp:529
> #1  <signal handler called>
> #2  0x7b0086c0 in _sigvector+0x10 () from /usr/lib/libc.2
> #3  0x7b00f114 in signalvector+0xac () from /usr/lib/libc.2
> #4  0x7b00f020 in signal+0xa0 () from /usr/lib/libc.2
> #5  0x187fc in sig_handler (No.Identifier=18) at /amd/devco/vitek/stdcxx-trunk/tests/src/process.cpp:529
> #6  <signal handler called>
> #7  0x7b0086c0 in _sigvector+0x10 () from /usr/lib/libc.2
> #8  0x7b00f114 in signalvector+0xac () from /usr/lib/libc.2
> #9  0x7b00f020 in signal+0xa0 () from /usr/lib/libc.2
> #10 0x187fc in sig_handler (No.Identifier=18) at /amd/devco/vitek/stdcxx-trunk/tests/src/process.cpp:529
> #11 <signal handler called>
> #12 0x7b0086c0 in _sigvector+0x10 () from /usr/lib/libc.2
> #13 0x7b00f114 in signalvector+0xac () from /usr/lib/libc.2
> #14 0x7b00f020 in signal+0xa0 () from /usr/lib/libc.2
> #15 0x187fc in sig_handler (No.Identifier=18) at /amd/devco/vitek/stdcxx-trunk/tests/src/process.cpp:529
> #16 <signal handler called>
> #17 0x7b0086c0 in _sigvector+0x10 () from /usr/lib/libc.2
> #18 0x7b00f114 in signalvector+0xac () from /usr/lib/libc.2
> #19 0x7b00f020 in signal+0xa0 () from /usr/lib/libc.2
> #20 0x187fc in sig_handler (No.Identifier=18) at /amd/devco/vitek/stdcxx-trunk/tests/src/process.cpp:529
> #21 <signal handler called>
> #22 0x7b00a160 in __sigtimedwait_sys+0x10 () from /usr/lib/libc.2
> #23 0x7b013c84 in sigtimedwait+0x6c () from /usr/lib/libc.2
> #24 0x7afa2a50 in sleep+0xe8 () from /usr/lib/libc.2
> #25 0x188f0 in rw_waitpid (pid=13825, result=0x7f7f0db0, timeout=5)
>     at /amd/devco/vitek/stdcxx-trunk/tests/src/process.cpp:555
> #26 0x15250 in join_test (pid=13825, should_hang=false) at /amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp:51
> #27 0x15424 in test_process_create1 () at /amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp:109
> #28 0x159b4 in run_test (argc=1, argv=0x7f7f08d4) at /amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp:276
> #29 0x16d1c in rw_vtest (argc=1, argv=0x7f7f08d4, 
>     file_name=0x8e090 "/amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp", clause=0x8e528
"0.process", 
>     comment=0x8e08f "", fun=0x4001ed52 <run_test(int, char **)>, optstr=0x8e534
"|-child#0 |-timeout#", va=0x7f7f0a34)
>     at /amd/devco/vitek/stdcxx-trunk/tests/src/driver.cpp:1030
> #30 0x171ec in rw_test (argc=1, argv=0x7f7f08d4, fname=0x8e090 "/amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp",

>     clause=0x8e528 "0.process", comment=0x8e08f "", testfun=0x4001ed52 <run_test(int,
char **)>, 
>     optstr=0x8e534 "|-child#0 |-timeout#") at /amd/devco/vitek/stdcxx-trunk/tests/src/driver.cpp:1127
> #31 0x15ad4 in main (argc=1, argv=0x7f7f08d4) at /amd/devco/vitek/stdcxx-trunk/tests/self/0.process.cpp:299
> {noformat}

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