[Yaffs] Problem with accessing YAFFS filesystem

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Author: ashokkumarkacham@bel.co.in
To: yaffs
Subject: [Yaffs] Problem with accessing YAFFS filesystem

I am using linux kernel version 2.6.37 on ARM based target platform, i
downloaded latest YAFFS code and re-compiled the kernel with yaffs
i am able to mount the mtdblock with yaffs file system type with the
following command

#mount -t yaffs /dev/mtdblock3 /Flash

mounting is o.k, but when i am copying file to the /Flash folder i am
getting following error with segmenation fault

Unable to handle kernel paging request at virtual address 74726f78
pgd = c63dc000
[74726f78] *pgd=00000000
Internal error: Oops: 5 [#2] PREEMPT
last sysfs file: /sys/kernel/uevent_seqnum
Modules linked in:
CPU: 0    Tainted: G      D      (2.6.37 #29)
PC is at yaffs_getxattr+0x38/0x94
LR is at cap_inode_need_killpriv+0x34/0x48
pc : [<c0162d60>]    lr : [<c017cf3c>]    psr: 60000013
sp : c5c75d60  ip : c5c75d80  fp : c5c75d7c
r10: 00000200  r9 : c78e9380  r8 : c746e6f0
r7 : 00000000  r6 : 00000000  r5 : 74726f70  r4 : c74af800
r3 : 00000000  r2 : f0000010  r1 : c0354225  r0 : c74af800
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 0005317f  Table: c63dc000  DAC: 00000015
Process tftp (pid: 1022, stack limit = 0xc5c74270)
Stack: (0xc5c75d60 to 0xc5c76000)
5d60: c74af800 00000000 00000000 00000000 c5c75d8c c5c75d80 c017cf3c 
5d80: c5c75ddc c5c75d90 c00752fc c017cf18 c024eea4 c0042200 c5c75f54 
5da0: c5c75df8 c5c75eac c5c74000 00000000 00000000 c746e76c 00000001 
5dc0: c5c75f18 c746e6f0 00000200 00000000 c5c75e5c c5c75de0 c0077140 
5de0: c5c75ecc c5c75df0 c0220864 c027c808 00000000 c7089d80 c5c75ed8 
5e00: c5c75ea0 c78e9380 c746e798 00000000 00000200 00000001 c6008000 
5e20: 00000011 00000fd8 0c00a8c0 00000200 c5c75e54 c746e76c 00000001 
5e40: c5c75f18 00000000 c78e9380 00000000 c5c75e94 c5c75e60 c0077338 
5e60: 000000cc 00000000 c5c75f00 c5c75ea0 c78e9380 c5c75f70 c5c75f70 
5e80: c5c74000 00000000 c5c75f3c c5c75e98 c00a6d98 c00772d4 00000000 
5ea0: 00000011 0fd87ed0 00000000 00000001 ffffffff c78e9380 00000000 
5ec0: 00000000 00000000 c787bcc0 00000000 00000000 00000000 00000000 
5ee0: c746b420 000ad044 00000200 c5c75f00 00000200 c5c75f00 c02214e8 
5f00: 0fd80002 0c00a8c0 00000000 00000000 000000eb 26bb02a4 000ad264 
5f20: 000ad264 c78e9380 00000200 000ad264 c5c75f6c c5c75f40 c00a781c 
5f40: 02faf080 00000000 000000eb 00000000 00000000 c78e9380 00000200 
5f60: c5c75fa4 c5c75f70 c00a796c c00a7774 00000000 00000000 00000000 
5f80: 00000000 00000200 00000004 000ad264 00000004 c002a104 00000000 
5fa0: c0029f80 c00a7938 00000200 00000004 00000004 000ad264 00000200 
5fc0: 00000200 00000004 000ad264 00000004 00000032 00000000 000ad260 
5fe0: 400264b0 bed0bbb0 0000e6d8 4022eabc 60000010 00000004 00000000 
[<c0162d28>] (yaffs_getxattr+0x0/0x94) from [<c017cf3c>]  
  r7:00000000 r6:00000000 r5:00000000 r4:c74af800
[<c017cf08>] (cap_inode_need_killpriv+0x0/0x48) from [<c00752fc>]  
[<c00752d4>] (file_remove_suid+0x0/0x70) from [<c0077140>]  
  r5:00000000 r4:00000200
[<c0076da8>] (__generic_file_aio_write+0x0/0x51c) from [<c0077338>]  
[<c00772c4>] (generic_file_aio_write+0x0/0xdc) from [<c00a6d98>]  
[<c00a6cf8>] (do_sync_write+0x0/0xec) from [<c00a781c>] 
  r6:000ad264 r5:00000200 r4:c78e9380
[<c00a7764>] (vfs_write+0x0/0x144) from [<c00a796c>] 
  r8:000ad264 r7:00000200 r6:c78e9380 r5:00000000 r4:00000000
[<c00a7928>] (sys_write+0x0/0x70) from [<c0029f80>]  
  r8:c002a104 r7:00000004 r6:000ad264 r5:00000004 r4:00000200
Code: e59f005c e1a01006 e5952030 eb055ab0 (e5954008)
---[ end trace d2d054f9d6677403 ]---
Segmentation fault

kindly guide me on how to resolve this problem, Thanks in advance


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