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 <linuxdh...@gmail.com> 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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