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tusc output - confused
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pankajtakawale
*nix forums beginner


Joined: 29 Aug 2005
Posts: 21

PostPosted: Tue Jul 11, 2006 3:22 pm    Post subject: tusc output - confused Reply with quote
this is tusc output:-

[23337] write(1, "1b[ 4 7 ; 1 H 1b[ M \n\n\nP r e ".., 40) ....... = 40
[23337] sigaction(SIGTSTP, 0x4000b07c, NULL) ..................... = 0
[23337] read(0, "\r", 255) ....................................... = 1
[23337] lseek64(8, 0, SEEK_CUR) .................................. = 24
[23337] lseek64(8, 6144, SEEK_SET) ............................... =
6144
[23337] read(8, "\0\0\006\0\0\005\0\0\0\a\0\0\010".., 1024) ...... =
1024
[23337] lseek64(8, 24, SEEK_SET) ................................. = 24
[23337] lseek64(8, 0, SEEK_CUR) .................................. = 24
[23337] lseek64(8, 4096, SEEK_SET) ............................... =
4096
[23337] read(8, "\0\0\004\0\0\003\0\0\0\n\0\0\010".., 1024) ...... =
1024
[23337] lseek64(8, 24, SEEK_SET) ................................. = 24
[23337] Received signal 10, SIGBUS, in user mode, [caught], partial
siginfo
[23337] Siginfo: si_code: I_NONEXIST, faulting address: 0x4003f15b,
si_errno: 0
[23337] PC: 0xc12b7317, instruction: 0x0c601094

Above trace doesnt show the actual culprit/victim system call.
Im just guessing that it is while reading the file.
What can be the cause of SIGBUS? reading corrupt file?
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Rick Jones
*nix forums Guru


Joined: 24 Feb 2005
Posts: 492

PostPosted: Tue Jul 11, 2006 5:53 pm    Post subject: Re: tusc output - confused Reply with quote
knowledgeseeker <pankaj.takawale@gmail.com> wrote:

Quote:
this is tusc output:-

[23337] write(1, "1b[ 4 7 ; 1 H 1b[ M \n\n\nP r e ".., 40) ....... = 40
[23337] sigaction(SIGTSTP, 0x4000b07c, NULL) ..................... = 0
[23337] read(0, "\r", 255) ....................................... = 1
[23337] lseek64(8, 0, SEEK_CUR) .................................. = 24
[23337] lseek64(8, 6144, SEEK_SET) ............................... =
6144
[23337] read(8, "\0\0\006\0\0\005\0\0\0\a\0\0\010".., 1024) ...... =
1024
[23337] lseek64(8, 24, SEEK_SET) ................................. = 24
[23337] lseek64(8, 0, SEEK_CUR) .................................. = 24
[23337] lseek64(8, 4096, SEEK_SET) ............................... =
4096
[23337] read(8, "\0\0\004\0\0\003\0\0\0\n\0\0\010".., 1024) ...... =
1024
[23337] lseek64(8, 24, SEEK_SET) ................................. = 24
[23337] Received signal 10, SIGBUS, in user mode, [caught], partial
siginfo
[23337] Siginfo: si_code: I_NONEXIST, faulting address: 0x4003f15b,
si_errno: 0
[23337] PC: 0xc12b7317, instruction: 0x0c601094

Above trace doesnt show the actual culprit/victim system call.
Im just guessing that it is while reading the file.
What can be the cause of SIGBUS? reading corrupt file?

IIRC it doesn't have to have been any of those system calls - the
SIGBUS could be for the application code chasing a bad pointer.

You might want to look at the core file with wdb (gdb) and see what
the stack trace tells you.

rick jones
--
The computing industry isn't as much a game of "Follow The Leader" as
it is one of "Ring Around the Rosy" or perhaps "Duck Duck Goose."
- Rick Jones
these opinions are mine, all mine; HP might not want them anyway... Smile
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
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Paul Pluzhnikov
*nix forums Guru


Joined: 25 Mar 2005
Posts: 512

PostPosted: Wed Jul 12, 2006 2:20 am    Post subject: Re: tusc output - confused Reply with quote
Rick Jones <rick.jones2@hp.com> writes:

Quote:
knowledgeseeker <pankaj.takawale@gmail.com> wrote:
....
Above trace doesnt show the actual culprit/victim system call.

Because system call is not a culprit, nor a victim.

Quote:
What can be the cause of SIGBUS? reading corrupt file?

A bug in the program.

Quote:
IIRC it doesn't have to have been any of those system calls

It's even stronger than that: there are *no* system calls (other than
"kill(getpid(), SIGBUS);" that is) which by themselves will cause
SIGBUS to be delievered to a process.

Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.
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Dennis Handly
*nix forums beginner


Joined: 28 Jun 2005
Posts: 38

PostPosted: Sat Jul 15, 2006 4:23 am    Post subject: Re: tusc output - confused Reply with quote
Eric Gouriou wrote:
: > Received signal 10, SIGBUS, in user mode, [caught], partial siginfo
: > Siginfo: si_code: I_NONEXIST, faulting address: 0x4003f15b,
: > PC: 0xc12b7317, instruction: 0x0c601094

: It is most likely due to reading multiple bytes at an incorrectly aligned
: address, in this case 0x4003f15b.

Exactly, the instruction is: LDWS 0(r3),r20
So R3 is misaligned.

: Tusc is the wrong tool for this job.
: Eric

It will only give you the PC, data address and the instruction.
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Ulrich Windl
*nix forums addict


Joined: 07 Mar 2005
Posts: 92

PostPosted: Tue Jul 18, 2006 7:42 am    Post subject: Re: tusc output - confused Reply with quote
"knowledgeseeker" <pankaj.takawale@gmail.com> writes:

Quote:
this is tusc output:-

[...]
[23337] lseek64(8, 24, SEEK_SET) ................................. = 24
[23337] Received signal 10, SIGBUS, in user mode, [caught], partial
siginfo
[23337] Siginfo: si_code: I_NONEXIST, faulting address: 0x4003f15b,
si_errno: 0
[23337] PC: 0xc12b7317, instruction: 0x0c601094

Above trace doesnt show the actual culprit/victim system call.

I think tusc is printing the system call after it has returned (to show you
the result).

Quote:
Im just guessing that it is while reading the file.
What can be the cause of SIGBUS? reading corrupt file?
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Google
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