Hello All,

I am using Linux 2.6.14 kernel on ARM cpu and added Yaffs support. I can mount and umount nand flash using Yaffs file system. However, I receive a kernel bug message if I delete the files on yaffs mtd device. After the error message, I cannot umount the mtd device. What is the root cause?

Below is the message:

/ $ Internal error: Oops: 817 [#1]
Modules linked in:
CPU: 0
PC is at __bug+0x40/0x54
LR is at 0x1
pc : [<c0029d80>]    lr : [<00000001>]    Not tainted
sp : c1bcdebc  ip : 60000093  fp : c1bcdec8
r10: 000a00a8  r9 : c1bcc000  r8 : c1bcdf44
r7 : c384f2b0  r6 : c00227a8  r5 : c04ac168  r4 : 00000000
r3 : 00000000  r2 : 00000000  r1 : 026a6ee7  r0 : 00000001
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: C000717F  Table: 328D0000  DAC: 00000015
Process rm (pid: 340, stack limit = 0xc1bcc194)
Stack: (0xc1bcdebc to 0xc1bce000)
dea0:                                                                c1bcdedc 
dec0: c1bcdecc c0091b40 c0029d50 c36a7000 c1bcdef8 c1bcdee0 c0101064 c0091af0 
dee0: c00227a8 c0100ff4 c00227a8 c1bcdf10 c1bcdefc c0092c18 c0101004 c00227a8 
df00: c285a000 c1bcdf2c c1bcdf14 c0092cac c0092b98 c00227a8 c285a000 c00227a8 
df20: c1bcdf40 c1bcdf30 c0091db0 c0092c9c 00000000 c1bcdfa4 c1bcdf44 c0088aa8 
df40: c0091d34 c384f090 c0394c60 643d0b71 0000000c c285a006 00000010 00000000 
df60: 00000000 00000000 02c13c00 00000000 449182ff 00000000 44917637 be988f74 
df80: 00000000 be988f74 00000000 00000000 0000000a c0025144 00000000 c1bcdfa8 
dfa0: c0024fc0 c0088984 be988f74 c002be54 be988f74 00000002 00000000 00000000 
dfc0: be988f74 00000000 00000000 00000002 000a0d7c 00000002 000a00a8 0000837c 
dfe0: 00000000 be988d88 0005cbc0 0007e65c 60000010 be988f74 00000000 00000000 
Backtrace: 
[<c0029d40>] (__bug+0x0/0x54) from [<c0091b40>] (clear_inode+0x60/0xd4)
[<c0091ae0>] (clear_inode+0x0/0xd4) from [<c0101064>] (yaffs_delete_inode+0x70/0x84)
 r4 = C36A7000 
[<c0100ff4>] (yaffs_delete_inode+0x0/0x84) from [<c0092c18>] (generic_delete_inode+0x90/0x104)
 r6 = C00227A8  r5 = C0100FF4  r4 = C00227A8 
[<c0092b88>] (generic_delete_inode+0x0/0x104) from [<c0092cac>] (generic_drop_inode+0x20/0x16c)
 r5 = C285A000  r4 = C00227A8 
[<c0092c8c>] (generic_drop_inode+0x0/0x16c) from [<c0091db0>] (iput+0x8c/0xa0)
 r6 = C00227A8  r5 = C285A000  r4 = C00227A8 
[<c0091d24>] (iput+0x0/0xa0) from [<c0088aa8>] (sys_unlink+0x134/0x184)
 r4 = 00000000 
[<c0088974>] (sys_unlink+0x0/0x184) from [<c0024fc0>] (ret_fast_syscall+0x0/0x2c)
 r8 = C0025144  r7 = 0000000A  r6 = 00000000  r5 = 00000000
 r4 = BE988F74 
Code: 1b004972 e59f0014 eb004970 e3a03000 (e5833000)