From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021130

Description of problem:
all of 2.4.18-17.7.x, 2.4.18-18.7.x, and 2.4.18-19.7.x causes a reboot of the PC
when X is started.Version 2.4.18-10 works.
XFree86 verion: XFree86-4.2.0-8

Hardware info:

 cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 1
model name      : AMD-K7(tm) Processor
stepping        : 2
cpu MHz         : 548.942
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat
mmx syscall mmxext 3dnowext 3dnow
bogomips        : 1094.45
 cat /proc/iomem 
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-27feffff : System RAM
  00100000-002199fc : Kernel code
  002199fd-002e56bf : Kernel data
27ff0000-27ff2fff : ACPI Non-volatile Storage
27ff3000-27ffffff : ACPI Tables
d8000000-dbffffff : PCI Bus #01
  d8000000-d8003fff : Matrox Graphics, Inc. MGA G400 AGP
  d9000000-d97fffff : Matrox Graphics, Inc. MGA G400 AGP
dc000000-ddffffff : Advanced Micro Devices [AMD] AMD-751 [Irongate] System Contr
oller
de000000-dfffffff : PCI Bus #01
  de000000-dfffffff : Matrox Graphics, Inc. MGA G400 AGP
e1000000-e1000fff : Advanced Micro Devices [AMD] AMD-756 [Viper] USB
  e1000000-e1000fff : usb-ohci
e1001000-e1001fff : Adaptec AHA-7850
  e1001000-e1001fff : aic7xxx
e1002000-e1002fff : Standard Microsystems Corp [SMC] 83C170QF
  e1002000-e1002fff : epic100
e1003000-e1003fff : Advanced Micro Devices [AMD] AMD-751 [Irongate] System Contr
oller
ffff0000-ffffffff : reserved
 cat /proc/pci 
PCI devices found:
  Bus  0, device   0, function  0:
    Host bridge: Advanced Micro Devices [AMD] AMD-751 [Irongate] System
Controller (rev 35).
      Master Capable.  Latency=32.  
      Prefetchable 32 bit memory at 0xdc000000 [0xddffffff].
      Prefetchable 32 bit memory at 0xe1003000 [0xe1003fff].
      I/O at 0xd000 [0xd003].
  Bus  0, device   1, function  0:
    PCI bridge: Advanced Micro Devices [AMD] AMD-751 [Irongate] AGP Bridge (rev 1).
      Master Capable.  Latency=32.  Min Gnt=14.
  Bus  0, device   7, function  0:
    ISA bridge: Advanced Micro Devices [AMD] AMD-756 [Viper] ISA (rev 1).
  Bus  0, device   7, function  1:
    IDE interface: Advanced Micro Devices [AMD] AMD-756 [Viper] IDE (rev 3).
      Master Capable.  Latency=32.  
      I/O at 0xf000 [0xf00f].
  Bus  0, device   7, function  3:
    Bridge: Advanced Micro Devices [AMD] AMD-756 [Viper] ACPI (rev 3).
      Master Capable.  Latency=32.  
  Bus  0, device   7, function  4:
    USB Controller: Advanced Micro Devices [AMD] AMD-756 [Viper] USB (rev 6).
      IRQ 5.
      Master Capable.  Latency=16.  Max Lat=80.
      Non-prefetchable 32 bit memory at 0xe1000000 [0xe1000fff].
  Bus  0, device   8, function  0:
    Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 8).
      IRQ 11.
      Master Capable.  Latency=32.  Min Gnt=2.Max Lat=20.
      I/O at 0xd400 [0xd41f].
  Bus  0, device   8, function  1:
    Input device controller: Creative Labs SB Live! MIDI/Game Port (rev 8).
      Master Capable.  Latency=32.  
      I/O at 0xd800 [0xd807].
  Bus  0, device  10, function  0:
    SCSI storage controller: Adaptec AHA-7850 (rev 3).
      IRQ 10.
      Master Capable.  Latency=32.  Min Gnt=4.Max Lat=4.
      I/O at 0xdc00 [0xdcff].
      Non-prefetchable 32 bit memory at 0xe1001000 [0xe1001fff].
  Bus  0, device  12, function  0:
    Ethernet controller: Standard Microsystems Corp [SMC] 83C170QF (rev 8).
      IRQ 11.
      Master Capable.  Latency=32.  Min Gnt=8.Max Lat=28.
      I/O at 0xe000 [0xe0ff].
      Non-prefetchable 32 bit memory at 0xe1002000 [0xe1002fff].
  Bus  1, device   5, function  0:
    VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 4).
      IRQ 7.
      Master Capable.  Latency=64.  Min Gnt=16.Max Lat=32.
      Prefetchable 32 bit memory at 0xde000000 [0xdfffffff].
      Non-prefetchable 32 bit memory at 0xd8000000 [0xd8003fff].
      Non-prefetchable 32 bit memory at 0xd9000000 [0xd97fffff].


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.Install one of the three newest versions of the kernel
2.Reboot
3.Crash during startx causes reboot
4.weep
    

Actual Results:  The system can not become operational

Expected Results:  A working system

Additional info:

After the first crash, fsck had to be run manually (automatic repair failed) !