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Posted to dev@harmony.apache.org by Simon Chow <si...@gmail.com> on 2007/10/29 12:26:38 UTC
[general][signal] I encountered some signals when debugging VM
The gdb trace is like this below, and it seems happen when creating VM.
I am curious, Where do they come from and what is major task of them ?
BTW. Can I block these signal when debugging VM?
Starting program:
/workspace/Harmony/trunk/working_vm/build/deploy/jdk/jre/bin/java Hello
[Thread debugging using libthread_db enabled]
[New Thread -1212938544 (LWP 5736)]
[New Thread -1214088304 (LWP 5739)]
[New Thread -1508099184 (LWP 5740)]
[New Thread -1511539824 (LWP 5741)]
[New Thread -1512068208 (LWP 5744)]
Program received signal SIGUSR2, User defined signal 2.
[Switching to Thread -1212938544 (LWP 5736)]
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Continuing.
Program received signal SIGUSR2, User defined signal 2.
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Continuing.
[New Thread -1512596592 (LWP 5746)]
Program received signal SIGUSR2, User defined signal 2.
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Breakpoint 1, main_runJavaMain (env=0x8429b98, mainClassName=0xbfc89bc8
"Hello", nameIsUTF=0, java_argc=0,
java_argv=0xbfc8970c, portLibrary=0xbfc89298) at ../shared/main.c:1322
1322 (*env)->DeleteLocalRef (env, stringClass);
--
>From : Simon.Chow@Software School of Fudan University
Re: [general][signal] I encountered some signals when debugging VM
Posted by Gregory Shimansky <gs...@apache.org>.
Alexei Fedotov wrote:
> Hello Simon,
>
> I have the following line in my .gdbinit
> handle SIGUSR2 nostop noprint
>
> I put this line when signals were used to flush a cash, and your
> experience shows that they are still used.
Actually they are used for thread suspension on Linux (and now BSD too).
On Linux IPF they are also used for flushing registers to the memory to
get thread register context.
In any case they should be usually ignored when debugging, which can be
done with gdb command
handle SIGUSR2 nostop noprint
as Alexei pointed out.
> Thanks.
>
> On 10/29/07, Simon Chow <si...@gmail.com> wrote:
>> The gdb trace is like this below, and it seems happen when creating VM.
>> I am curious, Where do they come from and what is major task of them ?
>> BTW. Can I block these signal when debugging VM?
>>
>> Starting program:
>> /workspace/Harmony/trunk/working_vm/build/deploy/jdk/jre/bin/java Hello
>> [Thread debugging using libthread_db enabled]
>> [New Thread -1212938544 (LWP 5736)]
>> [New Thread -1214088304 (LWP 5739)]
>> [New Thread -1508099184 (LWP 5740)]
>> [New Thread -1511539824 (LWP 5741)]
>> [New Thread -1512068208 (LWP 5744)]
>>
>> Program received signal SIGUSR2, User defined signal 2.
>> [Switching to Thread -1212938544 (LWP 5736)]
>> 0xffffe410 in __kernel_vsyscall ()
>> (gdb) c
>> Continuing.
>>
>> Program received signal SIGUSR2, User defined signal 2.
>> 0xffffe410 in __kernel_vsyscall ()
>> (gdb) c
>> Continuing.
>> [New Thread -1512596592 (LWP 5746)]
>>
>> Program received signal SIGUSR2, User defined signal 2.
>> 0xffffe410 in __kernel_vsyscall ()
>> (gdb) c
>> Breakpoint 1, main_runJavaMain (env=0x8429b98, mainClassName=0xbfc89bc8
>> "Hello", nameIsUTF=0, java_argc=0,
>> java_argv=0xbfc8970c, portLibrary=0xbfc89298) at ../shared/main.c:1322
>> 1322 (*env)->DeleteLocalRef (env, stringClass);
>>
>>
>>
>> --
>> From : Simon.Chow@Software School of Fudan University
>>
>
>
--
Gregory
Re: [general][signal] I encountered some signals when debugging VM
Posted by Alexei Fedotov <al...@gmail.com>.
Hello Simon,
I have the following line in my .gdbinit
handle SIGUSR2 nostop noprint
I put this line when signals were used to flush a cash, and your
experience shows that they are still used.
Thanks.
On 10/29/07, Simon Chow <si...@gmail.com> wrote:
> The gdb trace is like this below, and it seems happen when creating VM.
> I am curious, Where do they come from and what is major task of them ?
> BTW. Can I block these signal when debugging VM?
>
> Starting program:
> /workspace/Harmony/trunk/working_vm/build/deploy/jdk/jre/bin/java Hello
> [Thread debugging using libthread_db enabled]
> [New Thread -1212938544 (LWP 5736)]
> [New Thread -1214088304 (LWP 5739)]
> [New Thread -1508099184 (LWP 5740)]
> [New Thread -1511539824 (LWP 5741)]
> [New Thread -1512068208 (LWP 5744)]
>
> Program received signal SIGUSR2, User defined signal 2.
> [Switching to Thread -1212938544 (LWP 5736)]
> 0xffffe410 in __kernel_vsyscall ()
> (gdb) c
> Continuing.
>
> Program received signal SIGUSR2, User defined signal 2.
> 0xffffe410 in __kernel_vsyscall ()
> (gdb) c
> Continuing.
> [New Thread -1512596592 (LWP 5746)]
>
> Program received signal SIGUSR2, User defined signal 2.
> 0xffffe410 in __kernel_vsyscall ()
> (gdb) c
> Breakpoint 1, main_runJavaMain (env=0x8429b98, mainClassName=0xbfc89bc8
> "Hello", nameIsUTF=0, java_argc=0,
> java_argv=0xbfc8970c, portLibrary=0xbfc89298) at ../shared/main.c:1322
> 1322 (*env)->DeleteLocalRef (env, stringClass);
>
>
>
> --
> From : Simon.Chow@Software School of Fudan University
>
--
With best regards,
Alexei,
ESSD, Intel