Call Trace analysis doubt

[Mulyadi Santosa]

On Wed, Jun 15, 2016 at 1:26 PM, Muni Sekhar <munisekharrms at gmail.com>
wrote:

> Hi,
>
> Let’s assume WARNING message says something like:
>
>
> [    0.000000] Call Trace:
>
> [    0.000000]  [<ffffffff81762590>] dump_stack+0x45/0x56
>
> [    0.000000]  [<ffffffff8106dd2d>] warn_slowpath_common+0x7d/0xa0
>
> [    0.000000]  [<ffffffff8106dde4>] warn_slowpath_fmt_taint+0x44/0x50
>
> [    0.000000]  [<ffffffff8143329c>] ? acpi_tb_acquire_table+0x3e/0x6c
>
> [    0.000000]  [<ffffffff81765070>] warn_invalid_dmar+0x81/0x93
>
> [    0.000000]  [<ffffffff81d8989d>] detect_intel_iommu+0xe9/0x172
>
> [    0.000000]  [<ffffffff81d3c84f>] pci_iommu_alloc+0x4a/0x6c
>
> [    0.000000]  [<ffffffff81d4cb4b>] mem_init+0x17/0x9c
>
> [    0.000000]  [<ffffffff81d31e80>] start_kernel+0x23b/0x47d
>
> [    0.000000]  [<ffffffff81d31a4e>] ? set_init_arg+0x53/0x53
>
> [    0.000000]  [<ffffffff81d31120>] ? early_idt_handlers+0x120/0x120
>
> [    0.000000]  [<ffffffff81d315ee>] x86_64_start_reservations+0x2a/0x2c
>
> [    0.000000]  [<ffffffff81d31733>] x86_64_start_kernel+0x143/0x152
>
> [    0.000000] ---[ end trace c32c0e307381ad8a ]---
>
>
>
> Few symbols in the above mentioned call trace are prefixed with “?”
> (for e.g.  ?early_idt_handlers\? set_init_arg\?
> acpi_tb_acquire_table), what does it mean?
> Does it needs to be considered while debugging the kernel module?
>
>
>
> Call Trace shows “function+0xoffset/0xlength”. Does the
> 0xoffset/0xlength changes if the module is built with –g option and
> without –g option?
>
>
> Thanks in Advance,
>
> --
> Thanks,
> Sekhar
>
>
Hi...

Not sure about the "?".

But about the offset/length, I think it will differ, but mostly because -g
implies turning off certain optimization options.



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-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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