Hi Emeric,
I checked the kernel files and found
probe_kernel_write () throwing EPERM error
kernel/trace/ftrace.c
|
|__ ftrace_init(void)
|
|_ftrace_process_locs
|
|_ ftrace_update_code
|
|_ftrace_code_disable
|
|_ ftrace_make_nop() -arch/arm/kernel/ftrace.c
|
|_ftrace_modify_code
|
|__probe_kernel_write ()
Which Is throwing "-EPERM"
Any idea ?
Thanks
Dhyan
On Tuesday, August 20, 2013 5:02:26 AM UTC+5:30, m-ric wrote:
>
> Did you have a look into *ftrace_bug()* function to find out what can
> trigger this bug?
>
> Emeric
>
>
> On Mon, Aug 19, 2013 at 9:14 AM, Dhyan <[email protected]
> <javascript:>>wrote:
>
>> Dear All,
>>
>> I am trying to run ftrace in nexus-4.But when i enable ftrace i am
>> getting following in dmesg
>>
>> <6>[ 0.002166] ftrace: allocating 30960 entries in 91 pages
>> <4>[ 0.036563] ------------[ cut here ]------------
>> <4>[ 0.036593] WARNING: at kernel/trace/ftrace.c:1590
>> ftrace_bug+0xf0/0x178()
>> <4>[ 0.036654] [<c0015090>] (unwind_backtrace+0x0/0xec) from
>> [<c08529ac>] (dump_stack+0x20/0x24)
>> <4>[ 0.036685] [<c08529ac>] (dump_stack+0x20/0x24) from [<c0070db0>]
>> (warn_slowpath_common+0x58/0x70)
>> <4>[ 0.036716] [<c0070db0>] (warn_slowpath_common+0x58/0x70) from
>> [<c0070ec0>] (warn_slowpath_null+0x2c/0x34)
>> <4>[ 0.036746] [<c0070ec0>] (warn_slowpath_null+0x2c/0x34) from
>> [<c00d34b4>] (ftrace_bug+0xf0/0x178)
>> <4>[ 0.036777] [<c00d34b4>] (ftrace_bug+0xf0/0x178) from [<c0d145d8>]
>> (ftrace_init+0x364/0x50c)
>> <4>[ 0.036838] [<c0d145d8>] (ftrace_init+0x364/0x50c) from
>> [<c0d00944>] (start_kernel+0x42c/0x498)
>> <4>[ 0.036868] [<c0d00944>] (start_kernel+0x42c/0x498) from
>> [<8020803c>] (0x8020803c)
>> <4>[ 0.036899] ---[ end trace da227214a82491b7 ]---
>>
>> Can some one please help to fix this ?
>>
>> Thanks
>> Dhyan
>>
>>
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