I was correct that I had inadvertently installed a 32-bit version. I did not
know that it was possible to
install a 32-bit version on a 64-bit computer.
Anyway, using a 64-bit version of ubuntu 12.04, the bug exists in the
newer kernel (3.5.0-23) too.
# uname -a
Linux michael-MS-7596 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25
17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
And after the system crash, the relevant lines are:
# grep test1 /var/log/syslog
Apr 4 17:50:33 michael-MS-7596 kernel: [ 1664.381910] test1: Corrupted page
table at address 7f44ec76f000
Apr 4 17:50:33 michael-MS-7596 kernel: [ 1664.383402] Pid: 3448, comm: test1
Not tainted 3.5.0-23-generic #35~precise1-Ubuntu MICRO-STAR INTERNATIONAL
CO.,LTD MS-7596/760GM-E51(MS-7596)
Apr 4 17:50:33 michael-MS-7596 kernel: [ 1664.384897] Process test1 (pid:
3448, threadinfo ffff8800c29a8000, task ffff8800c2c31700)
I should add that although the program xawtv runs and does not crash the
computer, the displayed video is partially
corrupted.
An excerpt of the program "test1.c" is below:
...
//---------------------------------------- open /dev/mem
fd_mem = open ("/dev/mem", O_RDWR | O_SYNC);
if (fd_mem < 0) {
fprintf (stderr, "failed opening \"/dev/mem\" (must run as root)\n");
exit (-1);
}
//----------------------------- initialize all Bt878 video inputs
n_bt = 0;
for (i = 0; i < 1; i++) {
//----------------- read BT878 PCI configuration space (I/O space)
sprintf (s, "/sys/class/video4linux/video%d/device/config", i);
fp = fopen (s, "r");
if (fp == NULL) continue;
fseek (fp, 0x00, SEEK_SET); // Vendor ID/Device ID
fread (&j, 1, 4, fp);
if (j != 0x036E109E) { // not Bt878
fclose (fp);
continue;
}
fseek (fp, 0x10, SEEK_SET); // Base Address Register 0 (memory
space registers)
fread (&j, 1, 4, fp);
j &= 0xFFFFF000; // The low BAR bits have special
functions!
fclose (fp);
//------------------------ mmap memory space registers
addr = (off_t) j; // The low BAR bits have special
functions!
memsize = 4096;
mem = mmap (0, memsize, PROT_READ | PROT_WRITE, MAP_SHARED, fd_mem, addr);
if (mem == MAP_FAILED) {
perror ("mmap");
continue;
}
//-------------- The computer crashes at the following memcpy line.
memcpy (&c, mem, 1); // DSTATUS
if ((0x80 & c) == 0) {
fprintf (stderr, "No video signal \"/dev/video%d\"\n", i);
}
//----------- open "/dev/video<i>"
sprintf (s1, "/dev/video%d", i);
fd = open (s1, O_RDWR);
if (fd < 0) {
fprintf (stderr, "open video failed");
munmap (mem, memsize);
continue;
}
...
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https://bugs.launchpad.net/bugs/1162555
Title:
repeatable system crash related to bttv kernel module
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