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Mail Archives: cygwin/2010/07/13/17:17:54

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Date: Tue, 13 Jul 2010 23:17:11 +0200

From: Corvus Corax <corvuscorax AT cybertrench DOT com>

To: cygwin AT cygwin DOT com

Subject: Re: Sending SIGUSR1 to thread in nanosleep causes segfault

Message-ID: <20100713231711.2e804449@CorvusMC.home>

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--MP_/1ao6fOA0w2ocqZ+K/nRMSpj
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

Here are some backtraces:
--MP_/1ao6fOA0w2ocqZ+K/nRMSpj
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename=backtrace.txt


snapshot: cygwin1-20100707.dll.bz2
System AMD64 CPU - Windows XP Professional 64 bit Edition, Version 2003, Service Pack 2

Program is test_case_1_sleep.c:
 1 /**
 2  * small test program whether signals between threads work as they should
 3  */
 4 
 5 #include <unistd.h>
 6 #include <pthread.h>
 7 #include <signal.h>
 8
 9 void sighandler(int sig) {
10        write(2,".",1);
11        return;
12 }
13 
14 void* threadstart(void* arg) {
15 
16         while (1) {
17                 sleep(1);
18         }
19 }
20 
21 int main(char** argc, int argv) {
22 
23         pthread_t testthread1;  
24         struct sigaction action;
25 
26         action.sa_handler=sighandler;
27         action.sa_flags=0;
28         sigfillset( &action.sa_mask );
29         sigaction(SIGUSR1,&action,NULL);
30 
31         pthread_create(&testthread1,NULL,threadstart,NULL);
32         while (1) {
33                 pthread_kill(testthread1,SIGUSR1);
34         }
35 }

Generally those stack traces seem to be pretty borked. I assume as a result of heavy stack corruption
But maybe you can read something out of this mess.
Here are several variants I got:

(gdb) run
=============================================================================== This is the most common and reproducable backtrace:
Starting program: /home/Raven/OpenPilot/flight/PiOS.posix/posix/Libraries/FreeRTOS/Source/portable/GCC/Posix/corvuscorax/a.exe 
[New thread 1788.0x6e4]
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77c20000 not found.
Error while mapping shared library sections:
/cygdrive/c/WINDOWS/SysWOW64/ntdll32.dll: No such file or directory.
[New thread 1788.0x250]
[New thread 1788.0xc8]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 1788.0xc8]
0x18d4db2c in ?? ()
(gdb) thread apply all bt

Thread 3 (thread 1788.0xc8):
#0  0x18d4db2c in ?? ()
#1  0x00000001 in ?? ()
#2  0x18d4cdc8 in ?? ()
#3  0x610e30b5 in pthread::thread_init_wrapper (arg=0xb89788)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:1722
#4  0xffffffff in ?? ()
#5  0x00000000 in ?? ()

Thread 2 (thread 1788.0x250):
#0  0x7d61c876 in ?? ()
#1  0x7d4d08ac in KERNEL32!CreateThread ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002ec in ?? ()
#3  0x00000000 in ?? ()

Thread 1 (thread 1788.0x6e4):
#0  0x7d61c8a6 in ?? ()
#1  0x7d4da99c in KERNEL32!GetNlsSectionName ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002e8 in ?? ()
#3  0x00000000 in ?? ()
#0  0x18d4db2c in ?? ()
=============================================================================== But the occasional cases went more fun:
Starting program: /home/Raven/OpenPilot/flight/PiOS.posix/posix/Libraries/FreeRTOS/Source/portable/GCC/Posix/corvuscorax/a.exe 
[New thread 1780.0x1ec]
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77c20000 not found.
Error while mapping shared library sections:
/cygdrive/c/WINDOWS/SysWOW64/ntdll32.dll: No such file or directory.
[New thread 1780.0x5d0]
[New thread 1780.0xa8]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 1780.0xa8]
0x18d4db2c in ?? ()
(gdb) thread apply all bt

Thread 3 (thread 1780.0xa8):
#0  0x18d4db2c in ?? ()
#1  0x00000001 in ?? ()
#2  0x18d4cdc8 in ?? ()
#3  0x610e30b5 in pthread::thread_init_wrapper (arg=0xb89788)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:1722
#4  0xffffffff in ?? ()
#5  0x00000000 in ?? ()

Thread 2 (thread 1780.0x5d0):
#0  0x7d61e26f in ?? ()
#1  0x7d534baf in KERNEL32!GetCalendarInfoA ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002c8 in ?? ()
#3  0x0070c660 in ?? ()
#4  0x0070c968 in ?? ()
#5  0x61027a82 in setup_handler (sig=0, handler=0x0, siga=@0x0, tls=0x2c8)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/exceptions.cc:885
Backtrace stopped: frame did not save the PC

Thread 1 (thread 1780.0x1ec):
#0  0x7d61c846 in ?? ()
#1  0x7d4d8c9e in KERNEL32!GetCommandLineW ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002b0 in ?? ()
#3  0x00000000 in ?? ()
#0  0x18d4db2c in ?? ()
===============================================================================

Starting program: /home/Raven/OpenPilot/flight/PiOS.posix/posix/Libraries/FreeRTOS/Source/portable/GCC/Posix/corvuscorax/a.exe 
[New thread 1852.0xbc]
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77c20000 not found.
Error while mapping shared library sections:
/cygdrive/c/WINDOWS/SysWOW64/ntdll32.dll: No such file or directory.
[New thread 1852.0x428]
[New thread 1852.0x588]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 1852.0x588]
0x18d4db2c in ?? ()
(gdb) thread apply all bt

Thread 3 (thread 1852.0x588):
#0  0x18d4db2c in ?? ()
#1  0x00000001 in ?? ()
#2  0x18d4cdc8 in ?? ()
#3  0x610e30b5 in pthread::thread_init_wrapper (arg=0xb89788)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:1722
#4  0xffffffff in ?? ()
#5  0x00000000 in ?? ()

Thread 2 (thread 1852.0x428):
#0  0x7d61c876 in ?? ()
#1  0x7d4d08ac in KERNEL32!CreateThread ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002ec in ?? ()
#3  0x00000000 in ?? ()

Thread 1 (thread 1852.0xbc):
#0  0x7d4da92f in KERNEL32!GetNlsSectionName ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#1  0x00000018 in ?? ()
#2  0x610e0b71 in pthread_kill (thread=0xb89788, sig=30)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:2624
#3  0x610bfd06 in _sigfe () from /usr/bin/cygwin1.dll
#4  0x00401064 in sighandler (sig=1) at test_case_1_sleep.c:12
#5  0x61006ea3 in _cygwin_exit_return ()
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/dcrt0.cc:956
#6  0x61004aa6 in _cygtls::call2 (this=0x22ce64, 
    func=0x61006740 <dll_crt0_1(void*)>, arg=0x0, buf=0x22cdd4)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc:68
#7  0x61004b4b in _cygtls::call (func=0x61006740 <dll_crt0_1(void*)>, arg=0x0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc:61
#8  0x6100667a in _dll_crt0 AT 0 ()
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/dcrt0.cc:978
#9  0x00401172 in cygwin_crt0 ()
#10 0x0040103d in mainCRTStartup ()
#0  0x18d4db2c in ?? ()
===============================================================================
Starting program: /home/Raven/OpenPilot/flight/PiOS.posix/posix/Libraries/FreeRTOS/Source/portable/GCC/Posix/corvuscorax/a.exe 
[New thread 1820.0x74c]
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77c20000 not found.
Error while mapping shared library sections:
/cygdrive/c/WINDOWS/SysWOW64/ntdll32.dll: No such file or directory.
[New thread 1820.0x440]
[New thread 1820.0x5a0]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 1820.0x5a0]
0x18d4db2c in ?? ()
(gdb) thread apply all bt

Thread 3 (thread 1820.0x5a0):
#0  0x18d4db2c in ?? ()
#1  0x00000001 in ?? ()
#2  0x18d4cdc8 in ?? ()
#3  0x610e30b5 in pthread::thread_init_wrapper (arg=0xb89788)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:1722
#4  0xffffffff in ?? ()
#5  0x00000000 in ?? ()

Thread 2 (thread 1820.0x440):
#0  0x7d61c876 in ?? ()
#1  0x7d4d08ac in KERNEL32!CreateThread ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002ec in ?? ()
#3  0x00000000 in ?? ()

Thread 1 (thread 1820.0x74c):
#0  0x7d4d8e61 in KERNEL32!BaseProcessInitPostImport ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#1  0x0022cbb8 in ?? ()
#2  0x610c5b35 in sig_send (p=0x7d4d1504, si=@0x18d4fffc, tls=0x3000)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/sigproc.cc:723
Backtrace stopped: frame did not save the PC
#0  0x18d4db2c in ?? ()
===============================================================================
Starting program: /home/Raven/OpenPilot/flight/PiOS.posix/posix/Libraries/FreeRTOS/Source/portable/GCC/Posix/corvuscorax/a.exe 
[New thread 1580.0x6a0]
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77c20000 not found.
Error while mapping shared library sections:
/cygdrive/c/WINDOWS/SysWOW64/ntdll32.dll: No such file or directory.
[New thread 1580.0x49c]
[New thread 1580.0x780]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 1580.0x780]
0x18d4db2c in ?? ()
(gdb) thread apply all bt

Thread 3 (thread 1580.0x780):
#0  0x18d4db2c in ?? ()
#1  0x00000001 in ?? ()
#2  0x18d4cdc8 in ?? ()
#3  0x610e30b5 in pthread::thread_init_wrapper (arg=0xb89788)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:1722
#4  0xffffffff in ?? ()
#5  0x00000000 in ?? ()

Thread 2 (thread 1580.0x49c):
#0  0x7d534b9d in KERNEL32!GetCalendarInfoA ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#1  0x61027a82 in setup_handler (sig=30, handler=0x401040, siga=@0x61239b70, 
    tls=0x18d4ce64)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/exceptions.cc:885
#2  0x610285b9 in sigpacket::process (this=0x70ccb0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/exceptions.cc:1288
#3  0x610c672b in wait_sig ()
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/sigproc.cc:1271
#4  0x61003ff1 in cygthread::callfunc (this=0x611620a0, issimplestub=false)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygthread.cc:50
#5  0x61004111 in cygthread::stub (arg=0x611620a0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygthread.cc:98
#6  0x61004aa6 in _cygtls::call2 (this=0x70ce64, 
    func=0x610040b0 <cygthread::stub(void*)>, arg=0x611620a0, buf=0x70ce04)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc:68
#7  0x61004b4b in _cygtls::call (func=0x610040b0 <cygthread::stub(void*)>, 
    arg=0x611620a0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc:61
#8  0x6106d208 in threadfunc_fe (arg=0x611620a0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/init.cc:30
#9  0x7d4dfe37 in KERNEL32!GetConsoleOutputCP ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#10 0x611620a0 in cygthread::exiting () from /usr/bin/cygwin1.dll
#11 0x00000000 in ?? ()

Thread 1 (thread 1580.0x6a0):
#0  0x7d61c8a6 in ?? ()
#1  0x7d4da99c in KERNEL32!GetNlsSectionName ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002e8 in ?? ()
#3  0x00000000 in ?? ()
#0  0x18d4db2c in ?? ()
===============================================================================
Starting program: /home/Raven/OpenPilot/flight/PiOS.posix/posix/Libraries/FreeRTOS/Source/portable/GCC/Posix/corvuscorax/a.exe 
[New thread 1384.0x6ac]
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77c20000 not found.
Error while mapping shared library sections:
/cygdrive/c/WINDOWS/SysWOW64/ntdll32.dll: No such file or directory.
[New thread 1384.0x72c]
[New thread 1384.0x1e4]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 1384.0x1e4]
0x18d4db2c in ?? ()
(gdb) thread apply all bt

Thread 3 (thread 1384.0x1e4):
#0  0x18d4db2c in ?? ()
#1  0x00000001 in ?? ()
#2  0x18d4cdc8 in ?? ()
#3  0x610e30b5 in pthread::thread_init_wrapper (arg=0xb89788)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:1722
#4  0xffffffff in ?? ()
#5  0x00000000 in ?? ()

Thread 2 (thread 1384.0x72c):
#0  0x7d61c876 in ?? ()
#1  0x7d4d08ac in KERNEL32!CreateThread ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002ec in ?? ()
#3  0x00000000 in ?? ()

Thread 1 (thread 1384.0x6ac):
#0  0x7d61cea4 in ?? ()
#1  0x6106e312 in CreateEventW AT 16 (lpEventAttributes=0x611742ac, 
    bManualReset=0, bInitialState=<value optimized out>, lpName=0x0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/kernel32.cc:43
#2  0x6106e482 in CreateEventA AT 16 (lpEventAttributes=0x611742ac, 
    bManualReset=0, bInitialState=0, lpName=0x0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/kernel32.cc:66
#3  0x610c5c67 in sig_send (p=0x60fe0000, si=@0x22cbdc, tls=0x18d4ce64)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/sigproc.cc:667
#4  0x610e0b71 in pthread_kill (thread=0xb89788, sig=30)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:2624
#5  0x610bfd06 in _sigfe () from /usr/bin/cygwin1.dll
#6  0x00401064 in sighandler (sig=1) at test_case_1_sleep.c:12
#7  0x61006ea3 in _cygwin_exit_return ()
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/dcrt0.cc:956
#8  0x61004aa6 in _cygtls::call2 (this=0x22ce64, 
    func=0x61006740 <dll_crt0_1(void*)>, arg=0x0, buf=0x22cdd4)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc:68
#9  0x61004b4b in _cygtls::call (func=0x61006740 <dll_crt0_1(void*)>, arg=0x0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc:61
#10 0x6100667a in _dll_crt0 AT 0 ()
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/dcrt0.cc:978
#11 0x00401172 in cygwin_crt0 ()
#12 0x0040103d in mainCRTStartup ()
#0  0x18d4db2c in ?? ()
===============================================================================
Starting program: /home/Raven/OpenPilot/flight/PiOS.posix/posix/Libraries/FreeRTOS/Source/portable/GCC/Posix/corvuscorax/a.exe 
[New thread 324.0x4e8]
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77d40000 not found.
Error: dll starting at 0x77c20000 not found.
Error while mapping shared library sections:
/cygdrive/c/WINDOWS/SysWOW64/ntdll32.dll: No such file or directory.
[New thread 324.0x238]
[New thread 324.0x704]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 324.0x238]
0x610042a6 in _cygtls::push (this=0x70bdf0, addr=0)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc:190
190     /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc: No such file or directory.
        in /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/cygtls.cc
Current language:  auto; currently c++
(gdb) thread apply all bt

Thread 3 (thread 324.0x704):
#0  0x18d4db2c in ?? ()
#1  0x00000001 in ?? ()
#2  0x18d4cdc8 in ?? ()
#3  0x610e30b5 in pthread::thread_init_wrapper (arg=0xb89788)
    at /netrel/src/cygwin-snapshot-20100707-1/winsup/cygwin/thread.cc:1722
#4  0xffffffff in ?? ()
#5  0x00000000 in ?? ()

Thread 2 (thread 324.0x238):
#0  0x7d4e237e in KERNEL32!GetConsoleOutputCP ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#1  0x0070c0db in ?? ()
#2  0x40010006 in ?? ()
#3  0x00000000 in ?? ()

Thread 1 (thread 324.0x4e8):
#0  0x7d61c846 in ?? ()
#1  0x7d4d8c9e in KERNEL32!GetCommandLineW ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
#2  0x000002a0 in ?? ()
#3  0x00000000 in ?? ()
#0  0x7d4e237e in KERNEL32!GetConsoleOutputCP ()
   from /cygdrive/c/WINDOWS/syswow64/kernel32.dll
===============================================================================
thats it - didnt get any more variants so far - tried about 15-25 times
===============================================================================


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- Raw text -

webmaster	delorie software privacy
Copyright � 2019 by DJ Delorie	Updated Jul 2019

X-Recipient:	archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status:	No, hits=-0.2 required=5.0 tests=AWL,BAYES_00,SARE_BAYES_5x7,TW_CB,TW_XF,T_RP_MATCHES_RCVD
X-Spam-Check-By:	sourceware.org
X-cybertrench.com-virus-scan:	clean
Date:	Tue, 13 Jul 2010 23:17:11 +0200
From:	Corvus Corax <corvuscorax AT cybertrench DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Sending SIGUSR1 to thread in nanosleep causes segfault
Message-ID:	<20100713231711.2e804449@CorvusMC.home>
In-Reply-To:	<AANLkTil1j8AMz_RV7_tEETMf2wioTrOr89miENO37fsw@mail.gmail.com>
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