File copy from linux to MAC box generates kernel oops at ecryptfs_flush().

[Manjunatha]

Copying 8MB size file on encrypted folder of linux box to MAC OS X box happens
 with below issue.
 At MAC OS X, shows below message "Sorry,the operation could not be completed
because an unexpected error occurred (Error code - 50)."
Linux kernel version - 2.6.35.13 on my custom ARM board.
Network protocol used for transfer - AFP over TCP/IP.
-------------------
[17655.600000] Unable to handle kernel NULL pointer dereference at virtual
address 00000000
[17655.610000] pgd = bf33c000
[17655.620000] [00000000] *pgd=31de0031, *pte=00000000, *ppte=00000000
[17655.640000] Internal error: Oops: 17 [#14]
[17655.640000] last sysfs file: /sys/devices/virtual/net/eth0/address
[17655.640000] Modules linked in: iscsi_trgt pkp_drv(P) sppe ufsd(P)
usb_storage xhci_hcd sata_sil24 sopp_cns3xxx_nas cns3xxx_pse_init
[17655.640000] CPU: 0 Tainted: P D
(2.6.35.13-cavm1.whitney-econa.whitney-econa #2)
[17655.640000] PC is at ecryptfs_flush+0x10/0x3c
[17655.640000] LR is at filp_close+0x48/0x80
[17655.640000] pc : [<a06433c8>] lr : [<a057115c>] psr: a0000013
[17655.640000] sp : b3db1f58 ip : b3db1f68 fp : b3db1f64
[17655.640000] r10: 00000000 r9 : b3db0000 r8 : a04f1168
[17655.640000] r7 : 00000006 r6 : bc127b20 r5 : 00000001 r4 : bc426260
[17655.640000] r3 : 00000000 r2 : 00000000 r1 : bc127b20 r0 : bc426260
[17655.640000] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment
user
[17655.640000] Control: 00c5787d Table: 3f33c00a DAC: 00000015
[17655.640000] Process afpd (pid: 22419, stack limit = 0xb3db0268)
[17655.640000] Stack: (0xb3db1f58 to 0xb3db2000)
[17655.640000] 1f40:
b3db1f84 b3db1f68
[17655.640000] 1f60: a057115c a06433c4 00000000 bc426260 bc127b20 00000014
b3db1fa4 b3db1f88
[17655.640000] 1f80: a0571248 a0571120 00000000 000e48f0 00000000 0000006c
00000000 b3db1fa8
[17655.640000] 1fa0: a04f0fc0 a05711a0 000e48f0 00000000 00000014 00000002
35594ab4 00000000
[17655.640000] 1fc0: 000e48f0 00000000 0000006c 00000006 0001b920 00000000
000d30a8 00000000
[17655.640000] 1fe0: 00000000 9e94f9a0 355ee9b8 355ef1c4 80000010 00000014
00000000 00000000
[17655.640000] [<a06433c8>] (ecryptfs_flush+0x10/0x3c) from [<a057115c>]
(filp_close+0x48/0x80)
[17655.640000] [<a057115c>] (filp_close+0x48/0x80) from [<a0571248>]
(sys_close+0xb4/0xec)
[17655.640000] [<a0571248>] (sys_close+0xb4/0xec) from [<a04f0fc0>]
(ret_fast_syscall+0x0/0x30)
[17655.640000] Code: e1a0c00d e92dd800 e24cb004 e5903068 (e5930000)
[17655.650000] ---[ end trace c0188f434fc13721 ]---

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] Internal error: Oops: 17 [#14]

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] last sysfs file:
/sys/devices/virtual/net/eth0/address

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] Process afpd (pid: 22419, stack limit =
0xb3db0268)

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] Stack: (0xb3db1f58 to 0xb3db2000)

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] 1f40:
             b3db1f84 b3db1f68

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] 1f60: a057115c a06433c4 00000000 bc426260
bc127b20 00000014 b3db1fa4 b3db1f88

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] 1f80: a0571248 a0571120 00000000 000e48f0
00000000 0000006c 00000000 b3db1fa8

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] 1fa0: a04f0fc0 a05711a0 000e48f0 00000000
00000014 00000002 35594ab4 00000000

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] 1fc0: 000e48f0 00000000 0000006c 00000006
0001b920 00000000 000d30a8 00000000

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] 1fe0: 00000000 9e94f9a0 355ee9b8 355ef1c4
80000010 00000014 00000000 00000000

Message from syslogd@BA-FECD34 at Thu Aug 2 08:14:11 2012 ...
BA-FECD34 kernel: [17655.640000] Code: e1a0c00d e92dd800 e24cb004 e5903068
(e5930000)
----------------------------------------------------------

[Manjunatha (msrinivasan)]

Hi All
Please let me know is fix is already avaliable. If so please provide patch for kernel 2.6.35.13.
Thanks

[Manjunatha (msrinivasan)]

The other observations is on file read during copy from linux to MAC box is much faster than file writing from MAC to linux box on encrypted folder.

[Tyler Hicks (tyhicks)]

Targeting this against the upstream eCryptfs project, rather than Ubuntu's ecryptfs-utils package, since the report is about a kernel bug in a vanilla kernel.

[Tyler Hicks (tyhicks)]

Hello, sorry to hear that you're hitting this bug.

I've not seen anything similar to this and newer kernels do not have this problem. From looking at the back trace, I think these patches may potentially fix the problem:

332ab16 eCryptfs: Add reference counting to lower files
3b06b3e eCryptfs: Fix new inode race condition [1]
b59db43 eCryptfs: Prevent file create race condition

Please let me know if any of them work. Thanks!

[1]: Note that you'll need c4f7907 and 5ccf920 to get this to apply cleanly

[Manjunatha (msrinivasan)]

Hi Tyler Hicks

Thanks for your valuable information. When I try to apply the patches as per comment #4 over my kernel 2.6.35.13, were failed. Since these patches seems beloing to kernel version 2.6.39. Is there are patches (as per comment #4)readily avaliable for kernel version 2.6.35.13? Otherwise I need to to backport all these metioned patches to 2.6.35.13. Please suggest.
Thanks

[Tyler Hicks (tyhicks)]

On 2012-09-10 19:00:59, Manjunatha wrote:
> Thanks for your valuable information. When I try to apply the patches
> as per comment #4 over my kernel 2.6.35.13, were failed. Since these
> patches seems beloing to kernel version 2.6.39. Is there are patches
> (as per comment #4)readily avaliable for kernel version 2.6.35.13?
> Otherwise I need to to backport all these metioned patches to
> 2.6.35.13. Please suggest. Thanks

Sorry, I don't believe that anyone has done the backport work to 2.6.35.