linux-kernel - Oops: 17 SMP ARM (v3.16-rc2)

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Date:	Wed, 25 Jun 2014 13:55:05 +0000
From:	Mattis Lorentzon <Mattis.Lorentzon@...oliv.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>
Subject: Oops: 17 SMP ARM (v3.16-rc2)

Hello kernel people,

I have a similar issue with v3.16-rc2 as previously reported by Waldemar Brodkorb for v3.15-rc4.
https://lkml.org/lkml/2014/5/9/330

We are running a benchmark application, sometimes using perf, with heavy traffic over NFS.
The error is sporadic and it seems to occur more frequently when using perf.

Linux imx6-test0 3.16.0-rc2+ #1 SMP Wed Jun 25 15:04:16 CEST 2014 armv7l armv7l armv7l GNU/Linux

Any help is greatly appreciated.

Best regards,
Mattis Lorentzon

Unable to handle kernel paging request at virtual address ffffffff
pgd = 9e338000
[ffffffff] *pgd=2fffd821, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 146 Comm: stereo Not tainted 3.16.0-rc2+ #1
task: 9e07a700 ti: 81c42000 task.ti: 81c42000
PC is at find_get_entry+0x60/0xfc
LR is at radix_tree_lookup_slot+0x1c/0x2c
pc : [<800a34d8>]    lr : [<80290448>]    psr: a0000013
sp : 81c43d98  ip : 00000000  fp : 81c43dcc
r10: 00000001  r9 : 9e30e3c0  r8 : 000002a7
r7 : 9f3758a0  r6 : 00000000  r5 : 00000001  r4 : 00000000
r3 : 81c43d84  r2 : 00000000  r1 : 000002a7  r0 : ffffffff
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 10c5387d  Table: 2e33804a  DAC: 00000015
Process stereo (pid: 146, stack limit = 0x81c42240)
Stack: (0x81c43d98 to 0x81c44000)
3d80:                                                       00000000 00000000
3da0: 800a3478 000a6000 81c43ecc 00000000 9f37589c 00000000 806cb02a 000002a7
3dc0: 81c43e04 81c43dd0 800a406c 800a3484 80061ca0 9fc2dfe0 00000013 00000059
3de0: 9f37589c 9f375770 00000300 000002a7 9e30e3c0 000002a7 81c43e94 81c43e08
3e00: 800a50c4 800a4040 00000000 00000000 801d1818 00000000 00001000 00080001
3e20: 000002a6 9f3757f4 00000300 000a7000 00000000 801d1818 9e30e490 9f37567c
3e40: 81c43ee8 81c43ed4 00000000 00000000 804d87e0 80067098 00000004 9f375770
3e60: 81c43e94 81c43e70 801d491c 81c43ee8 9f375770 81c43ed4 9e30e3c0 9e07a700
3e80: 76907000 00000000 81c43ebc 81c43e98 801d1818 800a4dfc 80061ca0 80061b0c
3ea0: 9f375770 00200000 00000000 81c43f78 81c43f44 81c43ec0 800e1348 801d17b8
3ec0: 00100000 81c43ed0 800e1764 76907000 00100000 00000000 000a7000 00059000
3ee0: 81c43ecc 00000001 9e30e3c0 00000000 00000000 00000000 9e07a700 00000000
3f00: 00000000 00000000 00200000 00000000 00100000 00000000 00000000 00000000
3f20: 9e30e3c0 9e30e3c0 76907000 81c43f78 9e30e3c0 00100000 81c43f74 81c43f48
3f40: 800e1adc 800e12b8 00000000 0027cce0 00200000 00000000 9e30e3c0 9e30e3c0
3f60: 00100000 76907000 81c43fa4 81c43f78 800e2200 800e1a58 00200000 00000000
3f80: 0027cce0 00000000 0007cce0 00000003 8000ebc4 81c42000 00000000 81c43fa8
3fa0: 8000ea00 800e21c8 0027cce0 00000000 00000003 76907000 00100000 00000000
3fc0: 0027cce0 00000000 0007cce0 00000003 0142b5a0 00000000 00000000 00000000
3fe0: 00000000 7ec59d94 76dc26ac 76e1762c 60000010 00000003 00000000 00000000
Backtrace: 
[<800a3478>] (find_get_entry) from [<800a406c>] (pagecache_get_page+0x38/0x1d8)
 r8:000002a7 r7:806cb02a r6:00000000 r5:9f37589c r4:00000000
[<800a4034>] (pagecache_get_page) from [<800a50c4>] (generic_file_read_iter+0x2d4/0x750)
 r10:000002a7 r9:9e30e3c0 r8:000002a7 r7:00000300 r6:9f375770 r5:9f37589c
 r4:00000059
[<800a4df0>] (generic_file_read_iter) from [<801d1818>] (nfs_file_read+0x6c/0xa8)
 r10:00000000 r9:76907000 r8:9e07a700 r7:9e30e3c0 r6:81c43ed4 r5:9f375770
 r4:81c43ee8
[<801d17ac>] (nfs_file_read) from [<800e1348>] (new_sync_read+0x9c/0xc4)
 r6:81c43f78 r5:00000000 r4:00200000
[<800e12ac>] (new_sync_read) from [<800e1adc>] (vfs_read+0x90/0x150)
 r8:00100000 r7:9e30e3c0 r6:81c43f78 r5:76907000 r4:9e30e3c0
[<800e1a4c>] (vfs_read) from [<800e2200>] (SyS_read+0x44/0x98)
 r9:76907000 r8:00100000 r7:9e30e3c0 r6:9e30e3c0 r5:00000000 r4:00200000
[<800e21bc>] (SyS_read) from [<8000ea00>] (ret_fast_syscall+0x0/0x48)
 r9:81c42000 r8:8000ebc4 r7:00000003 r6:0007cce0 r5:00000000 r4:0027cce0
Code: e1a01008 eb07b3d6 e3500000 0a00001c (e5904000) 
---[ end trace bebb56a5d6f464ed ]---

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