Hello I have posted info on this problem before - but I think I now have better quality data. In summary I have run the Linux machine using FC2 at a 2.6.5 and 2.6.10 kernel level. 2.6.5 seems a bit more "stable". LEAST frequent hangs or crashes occur when I run 2.6.5 in a "command line mode" and neither a local X session nor VNC into the Linux machine is running. In contrast, when I run an X on the machine, either "locally" or thorugh VNC, the machine just "freezes" within minutes and only responds to a pwer-rest. When the 2.6.5 kernel does crash, it produces "console" messages. I just stumbled across copies of them by typing in "dmesg" - and I have reproduced below the result of doing that just now. Any idea what the following is indicating and where the problem might be? Any fixes or is there some nasty hard-ware failure causing this and I should junk the machine? Thanks Clive **************** dmesg output follows ********* : 4.1.0-ioctl (2003-12-10) initialised: dm@xxxxxxxxxxxxxx cdrom: open failed. Adding 1048312k swap on /dev/hda3. Priority:-1 extents:1 kjournald starting. Commit interval 5 seconds EXT3 FS on hda1, internal journal EXT3-fs: mounted filesystem with ordered data mode. IA-32 Microcode Update Driver: v1.13 <tigran@xxxxxxxxxxx> microcode: CPU0 updated from revision 0x24 to 0x37, date = 06042003 parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE,EPP] parport0: irq 7 detected SCSI subsystem initialized inserting floppy driver for 2.6.5-1.358 Floppy drive(s): fd0 is 1.44M FDC 0 is a National Semiconductor PC87306 8139too Fast Ethernet driver 0.9.27 PCI: Enabling device 0000:00:0a.0 (0000 -> 0003) divert: allocating divert_blk for eth0 eth0: RealTek RTL8139 at 0x1800, 00:90:f5:29:27:fc, IRQ 11 eth0: Identified 8139 chip type 'RTL-8100B/8139D' divert: freeing divert_blk for eth0 ip_tables: (C) 2000-2002 Netfilter core team 8139too Fast Ethernet driver 0.9.27 divert: allocating divert_blk for eth0 eth0: RealTek RTL8139 at 0x1800, 00:90:f5:29:27:fc, IRQ 11 eth0: Identified 8139 chip type 'RTL-8100B/8139D' ip_tables: (C) 2000-2002 Netfilter core team eth0: link up, 100Mbps, full-duplex, lpa 0x45E1 Linux Kernel Card Services options: [pci] [cardbus] [pm] Yenta: CardBus bridge found at 0000:00:0c.0 [1558:0402] Yenta: Using CSCINT to route CSC interrupts to PCI Yenta: Routing CardBus interrupts to PCI Yenta TI: socket 0000:00:0c.0, mfunc 0x01001002, devctl 0x44 Yenta: ISA IRQ mask 0x0400, PCI irq 5 Socket status: 30000006 cs: IO port probe 0x0c00-0x0cff: clean. cs: IO port probe 0x0100-0x04ff: excluding 0x378-0x37f 0x480-0x48f 0x4d0-0x4d7 cs: IO port probe 0x0a00-0x0aff: clean. parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE,EPP] parport0: irq 7 detected lp0: using parport0 (polling). lp0: console ready NET: Registered protocol family 10 Disabled Privacy Extensions on device 022db720(lo) IPv6 over IPv4 tunneling driver divert: not allocating divert_blk for non-ethernet device sit0 eth0: no IPv6 routers present Unable to handle kernel NULL pointer dereference at virtual address 00000008 printing eip: 0227c09b *pde = 00000000 Oops: 0000 [#1] CPU: 0 EIP: 0060:[<0227c09b>] Not tainted EFLAGS: 00010206 (2.6.5-1.358) EIP is at unix_poll+0x2/0x81 eax: 1c196280 ebx: 022e8fc0 ecx: 00000000 edx: 1c333381 esi: 00000000 edi: 00000145 ebp: 00000008 esp: 1cdb4ee8 ds: 007b es: 007b ss: 0068 Process Xvnc (pid: 2122, threadinfo=1cdb4000 task=1c244cb0) Stack: 00000000 022301cf 1c196280 0214f2b2 00000000 00000000 007ffffb 00000000 00000000 00000000 00000003 007ffffb 1cff2198 1cff2178 1cff2158 1cff21f4 1cff21d4 1cff21b4 7fffffff 00000003 00000000 1cdb4f84 1cdb4f90 00000017 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f2b2>] do_select+0x166/0x279 [<0214f00b>] __pollwait+0x0/0x94 [<0213f3d3>] get_user_size+0x30/0x57 [<0214f712>] sys_select+0x33a/0x43c [<021419a2>] sys_writev+0x2c/0x42 Code: c9 53 8b 5a 14 8b 53 92 74 06 85 d2 74 02 ff 00 0f b6 53 1d <1>Unable to handle kernel paging request at virtual address 440f0405 printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#2] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010202 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 0000000b ebx: 1a237200 ecx: 0000000b edx: 00000000 esi: 00000000 edi: 00000145 ebp: 00000008 esp: 13c2fee4 ds: 007b es: 007b ss: 0068 Process metaballs (pid: 2483, threadinfo=13c2f000 task=17c1a630) Stack: 022e8fc0 00000000 022301cf 15be5d80 0214f2b2 00000000 00000008 00000008 00000000 00000000 00000000 00000003 00000008 1cda2268 1cda2264 1cda2260 1cda2270 1cda226c 1cda2268 7fffffff 00000003 13c2ff48 13c2ff84 13c2ff90 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f2b2>] do_select+0x166/0x279 [<0214f00b>] __pollwait+0x0/0x94 [<0213f3d3>] get_user_size+0x30/0x57 [<0214f712>] sys_select+0x33a/0x43c [<0227ecc1>] schedule+0x3ed/0x44d [<021419a2>] sys_writev+0x2c/0x42 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f0405 printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#3] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010202 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 0000000b ebx: 19c03980 ecx: 0000000b edx: 00000000 esi: 00000000 edi: 00000145 ebp: 00000008 esp: 1a75aee4 ds: 007b es: 007b ss: 0068 Process xscreensaver (pid: 2368, threadinfo=1a75a000 task=1a696eb0) Stack: 022e8fc0 00000000 022301cf 1963ba80 0214f2b2 00000000 00000000 00000018 00000000 00000000 00000000 00000003 00000018 1cda25a8 1cda25a4 1cda25a0 1cda25b0 1cda25ac 1cda25a8 00021e3c 00000003 00000000 1a75af84 1a75af90 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f2b2>] do_select+0x166/0x279 [<0214f00b>] __pollwait+0x0/0x94 [<0213f3d3>] get_user_size+0x30/0x57 [<0214f712>] sys_select+0x33a/0x43c [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f03fa printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#4] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00210246 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 00000000 ebx: 17c23680 ecx: 00000000 edx: 00000000 esi: 00000145 edi: 1d43d228 ebp: 00000002 esp: 1a74ff40 ds: 007b es: 007b ss: 0068 Process rhn-applet-gui (pid: 2402, threadinfo=1a74f000 task=1a6963b0) Stack: 022e8fc0 00000145 022301cf 1778f380 0214f85d 1a74ff74 00000008 1d43d210 00000000 1a74ffa0 1d43d210 0214f8e0 1a74ff78 00000000 00000000 00000000 1d43d210 00000064 00000008 0214fa54 00000064 1d43d210 fffffff4 0213f423 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f85d>] do_pollfd+0x49/0x83 [<0214f8e0>] do_poll+0x49/0xa5 [<0214fa54>] sys_poll+0x118/0x1c0 [<0213f423>] put_user_size+0x29/0x2d [<0214f00b>] __pollwait+0x0/0x94 [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f03fa printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#5] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00210246 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 00000000 ebx: 16c87380 ecx: 00000000 edx: 00000000 esi: 00000145 edi: 1d348120 ebp: 00000001 esp: 17c5af40 ds: 007b es: 007b ss: 0068 Process mixer_applet2 (pid: 2437, threadinfo=17c5a000 task=1a622b30) Stack: 022e8fc0 00000145 022301cf 165ae380 0214f85d 17c5af74 0000000b 1d348110 00000000 17c5afa0 1d348110 0214f8e0 17c5af78 00000000 00000000 00000000 1d348110 000001f5 0000000b 0214fa54 000001f5 1d348110 fffffff4 0213f423 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f85d>] do_pollfd+0x49/0x83 [<0214f8e0>] do_poll+0x49/0xa5 [<0214fa54>] sys_poll+0x118/0x1c0 [<0213f423>] put_user_size+0x29/0x2d [<0214f00b>] __pollwait+0x0/0x94 [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f0405 printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#6] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010202 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 0000000b ebx: 190be800 ecx: 0000000b edx: 00000000 esi: 00000145 edi: 1b9f96a0 ebp: 00000001 esp: 1b932f40 ds: 007b es: 007b ss: 0068 Process magicdev (pid: 2396, threadinfo=1b932000 task=1a78a330) Stack: 022e8fc0 00000145 022301cf 18c69180 0214f85d 1b932f74 00000008 1b9f9690 00000000 1b932fa0 1b9f9690 0214f8e0 1b932f78 00000000 00000000 00000000 1b9f9690 000007d1 00000008 0214fa54 000007d1 1b9f9690 fffffff4 0213f423 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f85d>] do_pollfd+0x49/0x83 [<0214f8e0>] do_poll+0x49/0xa5 [<0214fa54>] sys_poll+0x118/0x1c0 [<0213f423>] put_user_size+0x29/0x2d [<0214f00b>] __pollwait+0x0/0x94 [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f03fa printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#7] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00210246 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 00000000 ebx: 17c23800 ecx: 00000000 edx: 00000000 esi: 00000145 edi: 1ccaea44 ebp: 00000000 esp: 17c5ff40 ds: 007b es: 007b ss: 0068 Process mapping-daemon (pid: 2431, threadinfo=17c5f000 task=17c1abb0) Stack: 022e8fc0 00000145 022301cf 17a1b580 0214f85d 17c5ff74 00000002 1ccaea3c 00000000 17c5ffa0 1ccaea3c 0214f8e0 17c5ff78 00000000 00000000 00000000 1ccaea3c 00001389 00000002 0214fa54 00001389 1ccaea3c fffffff4 0213f423 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f85d>] do_pollfd+0x49/0x83 [<0214f8e0>] do_poll+0x49/0xa5 [<0214fa54>] sys_poll+0x118/0x1c0 [<0213f423>] put_user_size+0x29/0x2d [<0214f00b>] __pollwait+0x0/0x94 [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f0405 printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#8] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010202 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 0000000b ebx: 1846a980 ecx: 0000000b edx: 00000000 esi: 00000145 edi: 1cda2644 ebp: 00000000 esp: 1c1eef40 ds: 007b es: 007b ss: 0068 Process pam-panel-icon (pid: 2400, threadinfo=1c1ee000 task=1a623630) Stack: 022e8fc0 00000145 022301cf 183ca780 0214f85d 1c1eef74 00000003 1cda263c 7fffffff 1c1eefa0 1cda263c 0214f8e0 1c1eef78 00000000 00000000 00000000 1cda263c 7fffffff 00000003 0214fa54 7fffffff 1cda263c fffffff4 18469ca4 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f85d>] do_pollfd+0x49/0x83 [<0214f8e0>] do_poll+0x49/0xa5 [<0214fa54>] sys_poll+0x118/0x1c0 [<0214f00b>] __pollwait+0x0/0x94 [<0211a483>] sys_waitpid+0x13/0x17 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f03fa printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#9] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010246 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 00000000 ebx: 19c03b00 ecx: 00000000 edx: 00000000 esi: 00000000 edi: 00000145 ebp: 00000008 esp: 20e8aee4 ds: 007b es: 007b ss: 0068 Process fam (pid: 2360, threadinfo=20e8a000 task=1a87c2b0) Stack: 022e8fc0 00000000 022301cf 19a4b780 0214f2b2 00000000 00000000 00006439 00000000 00000000 00000000 00000003 00006439 1ccaeac8 1ccaeac4 1ccaeac0 1ccaead0 1ccaeacc 1ccaeac8 00000000 00000003 00000000 20e8af84 20e8af90 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f2b2>] do_select+0x166/0x279 [<0214f00b>] __pollwait+0x0/0x94 [<0213f3d3>] get_user_size+0x30/0x57 [<0214f712>] sys_select+0x33a/0x43c [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f0405 printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#10] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010202 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 0000000b ebx: 1ad96c80 ecx: 0000000b edx: 00000000 esi: 00000145 edi: 1cff2a6c ebp: 00000002 esp: 1cdaff40 ds: 007b es: 007b ss: 0068 Process gconfd-2 (pid: 2184, threadinfo=1cdaf000 task=1bfd0d30) Stack: 022e8fc0 00000145 022301cf 1ab69980 0214f85d 1cdaff74 0000001d 1cff2a54 00000000 1cdaffa0 1cff2a54 0214f8e0 1cdaff78 00000000 00000000 00000000 1cff2a54 00007531 0000001d 0214fa54 00007531 1cff2a54 fffffff4 0213f423 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f85d>] do_pollfd+0x49/0x83 [<0214f8e0>] do_poll+0x49/0xa5 [<0214fa54>] sys_poll+0x118/0x1c0 [<0213f423>] put_user_size+0x29/0x2d [<0214f00b>] __pollwait+0x0/0x94 [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f03fa printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#11] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010246 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 00000000 ebx: 17c23380 ecx: 00000000 edx: 00000000 esi: 00000145 edi: 1d3486a0 ebp: 00000001 esp: 17c5bf40 ds: 007b es: 007b ss: 0068 Process clock-applet (pid: 2433, threadinfo=17c5b000 task=17c1b130) Stack: 022e8fc0 00000145 022301cf 166a7480 0214f85d 17c5bf74 0000000b 1d348690 00000000 17c5bfa0 1d348690 0214f8e0 17c5bf78 00000000 00000000 00000000 1d348690 0000ea60 0000000b 0214fa54 0000ea60 1d348690 fffffff4 0213f423 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f85d>] do_pollfd+0x49/0x83 [<0214f8e0>] do_poll+0x49/0xa5 [<0214fa54>] sys_poll+0x118/0x1c0 [<0213f423>] put_user_size+0x29/0x2d [<0214f00b>] __pollwait+0x0/0x94 [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f03fa printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#12] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010246 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 00000000 ebx: 1d1b0c80 ecx: 00000000 edx: 00000000 esi: 00000000 edi: 00000145 ebp: 00000008 esp: 1cca3ee4 ds: 007b es: 007b ss: 0068 Process xfs (pid: 2052, threadinfo=1cca3000 task=1cb171b0) Stack: 022e8fc0 00000000 022301cf 2113a280 0214f2b2 00000000 00000000 00000008 00000000 00000000 00000000 00000003 00000008 1d3485b4 1d3485a4 1d348594 1d3485e0 1d3485d0 1d3485c0 00000000 00000003 00000000 1cca3f84 1cca3f90 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f2b2>] do_select+0x166/0x279 [<0214f00b>] __pollwait+0x0/0x94 [<0213f3d3>] get_user_size+0x30/0x57 [<0214f712>] sys_select+0x33a/0x43c [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03 <1>Unable to handle kernel paging request at virtual address 440f0405 printing eip: 0227c0c4 *pde = 00000000 Oops: 0002 [#13] CPU: 0 EIP: 0060:[<0227c0c4>] Not tainted EFLAGS: 00010202 (2.6.5-1.358) EIP is at unix_poll+0x2b/0x81 eax: 0000000b ebx: 212f0500 ecx: 0000000b edx: 00000000 esi: 00000001 edi: 00000145 ebp: 00000020 esp: 1cc94ee4 ds: 007b es: 007b ss: 0068 Process gpm (pid: 2019, threadinfo=1cc94000 task=20a44e30) Stack: 022e8fc0 00000001 022301cf 20a5ae80 0214f2b2 00000000 00000000 00000030 00000000 00000000 00000010 00000005 00000030 1dc1c628 1dc1c624 1dc1c620 1dc1c630 1dc1c62c 1dc1c628 04cd6d4c 00000005 00000000 1cc94f84 1cc94f90 Call Trace: [<022301cf>] sock_poll+0x12/0x14 [<0214f2b2>] do_select+0x166/0x279 [<0214f00b>] __pollwait+0x0/0x94 [<0213f3d3>] get_user_size+0x30/0x57 [<0214f712>] sys_select+0x33a/0x43c [<0211a9c2>] sys_gettimeofday+0x25/0x55 Code: 10 80 fa 03 0f 44 cb 8d 43 44 39 43 44 75 07 f6 c2 01 74 03