[Crash-utility] modules and data / bss initialization

[Dave Anderson]

Castor Fu wrote:

>  I don't think this made it out earlier...Here's a fix.  I've also added something so 'MODULES_IN_CWD' will work on
> 2.6since modules will end with .koI hope this looks good to others....

Hi Castor,

Upon quick testing with RHEL4 and RHEL5 x86_64 kernels,
this patch certainly looks promising...

Although I don't particularly care to see these messages:

ffffffff8810ae80  serio_raw         41157  /lib/modules/2.6.18-1.2747.el5/kernel/drivers/input/serio/serio_raw.ko
ffffffff8811b580  uhci_hcd          59353  /lib/modules/2.6.18-1.2747.el5/kernel/drivers/usb/host/uhci-hcd.ko
ffffffff88130b00  shpchp            73069  /lib/modules/2.6.18-1.2747.el5/kernel/drivers/pci/hotplug/shpchp.ko
unexpected sym __key.10825 8814a180 sec .bss offset e180 mod_base 8813c000
XXX sym __key.10825 @ 8814a180 bfd val 0  section .bss
unexpected sym __key.10826 8814a180 sec .bss offset e180 mod_base 8813c000
XXX sym __key.10826 @ 8814a180 bfd val 0  section .bss
ffffffff88141f80  i2c_core          57793  /lib/modules/2.6.18-1.2747.el5/kernel/drivers/i2c/i2c-core.ko

I would think they could be CRASHDEBUG(1)'d, couldn't they?
Plus, those error messages will clip 64-bit values as shown
above.

I'm also presuming that the new add-symbol-file operation will
harmlessly take a "0" mod_data_start, mod_rodata_start or
mod_bss_start address argument; seemingly it does, since several
of my test modules have 0 as one or more of those start addresses.

Anyway, I also would be interested in the experiences of others
on the list who are using different architectures and kernel
versions.

Thanks,
  Dave






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