topic Re: IMX-6 Quad Core Reboot Issue in i.MX Processors

IMX-6 Quad Core Reboot Issue

bhupendrapawar — Wed, 14 Sep 2016 06:26:05 GMT

Recently I am facing random reboot issues related to pre-empt issues.

kernel version: 3.14.52
Android Os Version : Android L

I have gone through other threads regarding issue but not find any solutions.

Your help is much appreciated.

------------[ cut here ]------------
WARNING: CPU: 3 PID: 2112 at kernel/rcu/tree_plugin.h:230 rcu_note_context_switch+0x2b4/0x314()
Modules linked in:
CPU: 3 PID: 2112 Comm: logd.reader.per Tainted: G W 3.14.52 #38
[<c0015a74>] (unwind_backtrace) from [<c0012530>] (show_stack+0x10/0x14)
[<c0012530>] (show_stack) from [<c09d54fc>] (dump_stack+0x7c/0xbc)
[<c09d54fc>] (dump_stack) from [<c0039f24>] (warn_slowpath_common+0x74/0x90)
[<c0039f24>] (warn_slowpath_common) from [<c0039fdc>] (warn_slowpath_null+0x1c/0x24)
[<c0039fdc>] (warn_slowpath_null) from [<c0092958>] (rcu_note_context_switch+0x2b4/0x314)
[<c0092958>] (rcu_note_context_switch) from [<c09d9160>] (__schedule+0x74/0x754)
[<c09d9160>] (__schedule) from [<c09d9bc4>] (preempt_schedule+0x40/0x5c)
[<c09d9bc4>] (preempt_schedule) from [<c07b5fa0>] (sock_def_readable+0x3c/0x64)
[<c07b5fa0>] (sock_def_readable) from [<c0890680>] (unix_dgram_sendmsg+0x520/0x5bc)
[<c0890680>] (unix_dgram_sendmsg) from [<c07b2a44>] (sock_aio_write+0xdc/0xf8)
[<c07b2a44>] (sock_aio_write) from [<c012c120>] (do_sync_readv_writev+0x68/0x90)
[<c012c120>] (do_sync_readv_writev) from [<c012d15c>] (do_readv_writev+0xb0/0x214)
[<c012d15c>] (do_readv_writev) from [<c012d364>] (vfs_writev+0x40/0x64)
[<c012d364>] (vfs_writev) from [<c012d468>] (SyS_writev+0x44/0x9c)
[<c012d468>] (SyS_writev) from [<c000e620>] (ret_fast_syscall+0x0/0x38)
---[ end trace c76048af6770ab80 ]---

INFO: rcu_preempt detected stalls on CPUs/tasks: { P200 P200 P200 P200 P200 P200 P200 P200 P200 P200 P200 P200 P200 P200
P200 P200 P200
---->system reboot
U-Boot SPL 2015.04 (Jul 27 2016 - 14:02:35)

Re: IMX-6 Quad Core Reboot Issue

igorpadykov — Wed, 14 Sep 2016 09:55:40 GMT

Hi bhupendra

reboot may be caused by ddr errors, please try ddr test

https://community.freescale.com/docs/DOC-105652

Best regards
igor
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Re: IMX-6 Quad Core Reboot Issue

bhupendrapawar — Fri, 16 Sep 2016 05:48:45 GMT

Thank you Igor,

Issue happened only when some android application running in while for more than 18 hrs.

Is it possible to disable watchdog?

Re: IMX-6 Quad Core Reboot Issue

bhupendrapawar — Wed, 05 Oct 2016 05:52:30 GMT

The issue was resolved by reducing IMX6 processor frequency from 996MHz to 792MHz. No issue is seen after this change.