Re: Re: Re: Re: Re: Re: A reliable kernel panic (3.6.2) and system crash when visiting a particular website

On Oct 21, 2012, Borislav Petkov [off-list ref] wrote: 

On Sun, Oct 21, 2012 at 11:59:36AM +0000, Artem S. Tashkinov wrote:

quoted

http://imageshack.us/a/img685/9452/panicz.jpg

list_del corruption. prev->next should be ... but was ...

Btw, this is one of the debug options I told you to enable.

quoted

I cannot show you more as I have no serial console to use :( and the kernel
doesn't have enough time to push error messages to rsyslog and fsync
/var/log/messages

I already told you how to catch that oops: boot with "pause_on_oops=600"
on the kernel command line and photograph the screen when the first oops
happens. This'll show us where the problem begins.

This option didn't have any effect, or maybe it's because it's such a serious crash
the kernel has no time to actually print an ooops/panic message.

dmesg messages up to a crash can be seen here: https://bugzilla.kernel.org/attachment.cgi?id=84221

I dumped them using this application:

$ cat scat.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define O_LARGEFILE 0100000
#define BUFFER 4096
#define __USE_FILE_OFFSET64 1
#define __USE_LARGEFILE64 1

int main(int argc, char *argv[])
{
	int fd_out;
	int64_t bytes_read;
	void *buffer;

	if (argc!=2) {
		printf("Usage is: scat destination\n");
		return 1;
	}

	buffer = malloc(BUFFER * sizeof(char));
	if (buffer == NULL) {
		printf("Error: can't allocate buffers\n");
		return 2;		
	}
	memset(buffer, 0, BUFFER);

	printf("Dumping to \"%s\" ... ", argv[1]);
	fflush(NULL);

	if ((fd_out = open64(argv[1], O_WRONLY | O_LARGEFILE | O_SYNC | O_NOFOLLOW, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) == -1) {
		printf("Error: destination file can't be created\n");
		perror("open() ");
		return 2;
	}

	bytes_read = 1;

	while (bytes_read) {
		bytes_read = fread(buffer, sizeof(char), BUFFER, stdin);

		if (write(fd_out, (void *) buffer, bytes_read) != bytes_read)
		{
			printf("Error: can't write data to the destination file! Possibly a target disk is full\n");
			return 3;
		}

	}

	close(fd_out);

	printf(" OK\n");
	return 0;
}


I ran it this way: while :; do dmesg -c; done | scat /dev/sda11 (yes, straight to a hdd partition to eliminate a FS cache)

Don't judge me harshly - I'm not a programmer.