[IBM XLC++ 9.0/AIX 5.3] SIGSEGV in 0.process

• Key: STDCXX-625
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Major
• Assignee: Travis Vitek
• Reporter: Travis Vitek
• Component/s: Tests
• Affects Version/s: 4.2.0
• Fix Version/s: 4.2.1

Description

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