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cannot find map file

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# 1  
Old 11-14-2011
cannot find map file
Hi, all:

My writed network device driver works fine when the transmitted file is under several MegaBytes, but above this size, especially dozens of or hundreds of MegaBytes, the kernel panic ocurres! I check the kern.log and find this error :
Code:
 522 Nov 14 19:35:32 liklstar-server kerneNov 14 19:37:52 liklstar-server kernel: Cannot find map file.
 523 Nov 14 19:37:52 liklstar-server kernel: Loaded 64988 symbols from 45 modules.
 524 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] Initializing cgroup subsys cpuset
 525 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] Initializing cgroup subsys cpu
 526 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] Linux version 3.0.4 (root'at'liklstar-server) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #1 SMP Su     n Nov 13 02:31:23 CST 2011
 527 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] BIOS-provided physical RAM map:
 528 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009f400 (usable)
 529 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
 530 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 00000000000e2000 - 0000000000100000 (reserved)
 531 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 0000000000100000 - 00000000cff90000 (usable)
 532 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 00000000cff90000 - 00000000cff9e000 (ACPI data)
 533 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 00000000cff9e000 - 00000000cffe0000 (ACPI NVS)
 534 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 00000000cffe0000 - 00000000d0000000 (reserved)
 535 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
 536 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]  BIOS-e820: 0000000100000000 - 0000000220000000 (usable)
 537 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] Notice: NX (Execute Disable) protection cannot be enabled: non-PAE kernel!
 538 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] DMI present.
 539 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] DMI: MSI MS-7623/880GM-E41 (MS-7623), BIOS V11.8 12/01/2010
 540 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved)
 541 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
 542 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] last_pfn = 0xcff90 max_arch_pfn = 0x100000
 543 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] MTRR default type: uncachable
 544 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] MTRR fixed ranges enabled:
 545 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   00000-9FFFF write-back
 546 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   A0000-EFFFF uncachable
 547 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   F0000-FFFFF write-protect
 548 Nov 14 19:37:52 liklstar-server kernel: [    0.000000] MTRR variable ranges enabled:
 549 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   0 base 000000000000 mask FFFF80000000 write-back
 550 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   1 base 000080000000 mask FFFFC0000000 write-back
 551 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   2 base 0000C0000000 mask FFFFF0000000 write-back
 552 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   3 disabled
 553 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   4 disabled
 554 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   5 disabled
 555 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   6 disabled
 556 Nov 14 19:37:52 liklstar-server kernel: [    0.000000]   7 disabled
... ...

what do these messages mean? Is it a kernel bug? what should I do with my driver?


thanks!
li,kunlun
Last edited by vbe; 11-15-2011 at 05:54 AM.. Reason: use code tags next time for your code and data!
# 2  
Old 11-16-2011
I think 'cannot find map file' is harmless and nothing to do with your crash.

In systems with broken BIOSes which supply incorrect memory maps to the kernel, you may need to tell the kernel to ignore the BIOS map and use a map that you give to it. That's the "file" it's talking to.

I don't think it's a literal file, either, but something which gets built into the kernel at compile time.
# 3  
Old 11-17-2011
Dear Corona688:

Thanks for your help! You are crrect! The "map file" isn't the reason causing system crash!

I have already digged the bug!


thanks!
li,kunlun
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