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Re: Application is being killed by kernel with signal 11 [message #7997 is a reply to message #7995]

Thu, 02 November 2006 15:54

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

SIGSEGV is sent by kernel usually when application tries to access memory by invalid pointer. The typical reasons for this are:
1. memory corruptions. check your hardware according to http://wiki.openvz.org/Hardware_testing

2. bugs in software. this can be caught by:
a) adding kernel messages when SIGSEGV is sent.
for example, for i386 arch check arch/i386/mm/fault.c, function do_page_fault():

<skipped>
bad_area:
up_read(&mm->mmap_sem);

bad_area_nosemaphore:
/* User mode accesses just cause a SIGSEGV */
if (error_code & 4) {
/*
* Valid to do another page fault here because this one came
* from user space.
*/
if (is_prefetch(regs, address, error_code))
return;

tsk->thread.cr2 = address;
/* Kernel addresses are always protection faults */
tsk->thread.error_code = error_code | (address >= TASK_SIZE);
tsk->thread.trap_no = 14;
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
info.si_addr = (void __user *)address;
force_sig_info(SIGSEGV, &info, tsk);
return;
}

SIGSEGV is sent above by force_sig_info(), so what you can do here is to print application eip address (regs->eip) to check where its problem occurs.

b) debug application with gdb to see where it gets SIGSEGV.
c) save core dump from an application and analyze it later.

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[Message index]

		Application is being killed by kernel with signal 11 By: iziz on Tue, 31 October 2006 16:44
		Re: Application is being killed by kernel with signal 11 By: glowfish on Wed, 01 November 2006 11:28
		Re: Application is being killed by kernel with signal 11 By: Antarion on Wed, 01 November 2006 14:27
		Re: Application is being killed by kernel with signal 11 By: dev on Wed, 01 November 2006 15:44
		Re: Application is being killed by kernel with signal 11 By: iziz on Thu, 02 November 2006 15:40
		Re: Application is being killed by kernel with signal 11 By: dev on Thu, 02 November 2006 15:54
		Re: Application is being killed by kernel with signal 11 By: iziz on Thu, 02 November 2006 15:58
		Re: Application is being killed by kernel with signal 11 By: dev on Thu, 02 November 2006 16:05
		Re: Application is being killed by kernel with signal 11 By: iziz on Thu, 02 November 2006 16:14
		Re: Application is being killed by kernel with signal 11 By: dev on Thu, 02 November 2006 16:34
		Re: Application is being killed by kernel with signal 11 By: iziz on Thu, 02 November 2006 16:51
		Re: Application is being killed by kernel with signal 11 By: lcslouis on Wed, 13 December 2006 07:26
		Re: Application is being killed by kernel with signal 11 By: dev on Wed, 13 December 2006 08:46
		Re: Application is being killed by kernel with signal 11 By: lcslouis on Wed, 13 December 2006 08:50
		Re: Application is being killed by kernel with signal 11 By: dev on Wed, 13 December 2006 08:55
		Re: Application is being killed by kernel with signal 11 By: dev on Wed, 13 December 2006 08:59
		Re: Application is being killed by kernel with signal 11 By: lcslouis on Wed, 13 December 2006 09:30
		Re: Application is being killed by kernel with signal 11 By: dev on Wed, 13 December 2006 09:36
		Re: Application is being killed by kernel with signal 11 By: lcslouis on Wed, 13 December 2006 13:42

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