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https://issues.apache.org/jira/browse/STDCXX-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12540664
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Martin Sebor commented on STDCXX-625:
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You're right, my mistake. I wasn't careful enough trying to create a simple
test case. It must be something else. All I'm saying is that the utility would
hang when attempting to kill 22.messages.mt after I accidentally changed
sigaction() to signal() in rev 588734 (see
http://www.nabble.com/22.locale.messages-hangs-on-Linux-tf4721753.html#a13508587).
And if you read the diff for exec.cpp below for this change you'll even see a
comment on line 466 that reads:
- /* Set handler (if needed). Need to use sigaction rather than signal due
- to linux glitch
- */
http://svn.apache.org/viewvc/incubator/stdcxx/branches/4.2.x/util/exec.cpp?r1=588734&r2=588733&pathrev=588734
I don't remember the details and, unfortunately, the original author didn't
provide them. All I remember is that we discussed the issue when we first ran
into it and decided to deal with it by using sigaction(). Now that we've spent
this much time discussing we might as well go all the way and figure out what
this "glitch" is.
> 0.process test fails with SEGV due to stack overflow
> ----------------------------------------------------
>
> 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
> Environment: HP-UX or AIX platforms
> Reporter: Travis Vitek
> Assignee: Travis Vitek
> Priority: Minor
> 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....
> 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"
> Here is the stack on HP-UX
> #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
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