Understanding of kernel stack print

[pramod gurav]

On Tue, Mar 18, 2014 at 11:35 AM, meenakshi aggarwal
<meenu23688 at gmail.com>wrote:

> Hi,
>
> On reboot my system is showing kernel stack trace as :
>
> root at ds:~# reboot
>
> INIT: Sending processes the TERM signal
> INIT
> Stopping Dropbear SSH server: stopped /usr/sbin/dropbear (pid 2152)
> dropbear.
> Stopping network benchmark server: netserverstopped /usr/sbin/netserver
> (pid 2157)
> .
> Stopping system log daemon...0
> Stopping kernel log daemon...0
> Deconfiguring network interfaces... done.
> Sending all processes the TERM signal...
> Sending all processes the KILL signal...
> Unmounting remote filesystems...
> Deactivating swap...
> Unmounting local filesystems...
> Rebooting... Disabling non-boot CPUs ...
>
> BUG: scheduling while atomic: reboot/2210/0x00000002
> Modules linked in:
> Preemption disabled at:[<  (null)>]   (null)
>
> Call Trace:
> [ebe09b20] [c0007094] show_stack+0x44/0x150 (unreliable)
> [ebe09b60] [c064f5f4] __schedule_bug+0x84/0x9c
> [ebe09b70] [c064c1c0] __schedule+0x510/0x5e0
> [ebe09c80] [c064aea4] schedule_timeout+0x164/0x1d0
> [ebe09cc0] [c064bb10] wait_for_common+0xd0/0x1b0
> [ebe09d00] [c004db58] kthread_create_on_node+0xa8/0x140
> [ebe09d70] [c00a42cc] _cpu_down+0x1ec/0x4e0
> [ebe09de0] [c002d8a0] disable_nonboot_cpus+0x90/0x160
> [ebe09e10] [c004044c] kernel_restart+0x1c/0x90
> [ebe09e20] [c004069c] sys_reboot+0x1cc/0x250
> [ebe09f40] [c000efe0] ret_from_syscall+0x0/0x3c
> --- Exception: c01 at 0xff17684
>     LR = 0x10000c00
> BUG: scheduling while atomic: reboot/2210/0x00000002
>

Looks Like some race condition.

> Modules linked in:
> Preemption disabled at:[<  (null)>]   (null)
>
> Call Trace:
> [ebe09b90] [c0007094] show_stack+0x44/0x150 (unreliable)
> [ebe09bd0] [c064f5f4] __schedule_bug+0x84/0x9c
> [ebe09be0] [c064c1c0] __schedule+0x510/0x5e0
> [ebe09cf0] [c064aea4] schedule_timeout+0x164/0x1d0
> [ebe09d30] [c064bb10] wait_for_common+0xd0/0x1b0
> [ebe09d70] [c00a42f8] _cpu_down+0x218/0x4e0
> [ebe09de0] [c002d8a0] disable_nonboot_cpus+0x90/0x160
> [ebe09e10] [c004044c] kernel_restart+0x1c/0x90
> [ebe09e20] [c004069c] sys_reboot+0x1cc/0x250
> [ebe09f40] [c000efe0] ret_from_syscall+0x0/0x3c
> --- Exception: c01 at 0xff17684
>     LR = 0x10000c00
>
>
> and so on.
>
> Any kind of help will be appreciated.
>
> Also i want to know the significance of *0x84/0x9c*
>
> " __schedule_bug+*0x84/0x9c*"
>
> This is offset(*0x84/0x9c*) from the function(__schedule_bug) where the
next branching  was done or call to a function was made. In this case at
address " __schedule_bug+0x84/0x9c" function 'show_stack' was called.

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-- 
Thanks and Regards
Pramod
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