JFFS2 on NAND problems on ppc linux-2.4.21-pre2

Chris Sperandeo csperandeo at intrinsyc.com
Wed Apr 9 20:20:46 EDT 2003


Wondering if anyone has experienced a bug described as follows.

I am using the linux powerpc kernel 2.4.21-pre2.  We are using a March 09 
2003 snapshot for MTD/JFFS2 from http://www.linux-mtd.infradead.org/.

After rebooting the device we occasionally receive the following:

jffs2_get_inode_nodes(): CRC failed on node at 0x00d8a9c0: Read 0xffffffff, 
calculated 0x4deb59e5

jffs2_get_inode_nodes(): Data CRC failed on node at 0x00d89a8c: Read 
0xbaa193f5, calculated 0xcdd1fe6c Checked all inodes but still 0x1c20 bytes 
of unchecked space? kernel BUG at gc.c:140!
Oops: Exception in kernel mode, sig: 4
NIP: C00A0420 XER: 00000000 LR: C00A0420 SP: C033FF10 REGS: c033fe60 TRAP: 
 Not tainted
MSR: 00009030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
TASK = c033e000[8] 'jffs2_gcd_mtd1' Last syscall: -1
last math 00000000 last altivec 00000000
PLB0: bear= 0x00000000 acr=   0x00000000 besr=  0x00000000
PLB0 to OPB: bear= 0x00000000 besr0= 0x00000000 besr1= 0x00000000

GPR00: C00A0420 C033FF10 C033E000 00000018 00001030 00000001 00000020 C01F0000
GPR08: 00003DA8 C01A5D04 00000000 C033FE30 82004028 1001F598 00FE4100 007FFF2F
GPR16: 00000000 00000001 007FFF00 FFFFFFFF 00FDF920 00000000 00F9F548 00000002
GPR24: 00000000 C01AB4AC 00000000 FFFFFFFF 00000000 C035CDB8 C03CF0F8 C03CF0C4
Call backtrace:
C00A0420 C00A3790 C0006F00

It appears that something has gone wrong with the garbage collection thread 
(at least that is one of the theories).  Inserting a delay before actually 
rebooting the device seems to remedy the problem somewhat but does not make 
the problem dissappear.

Is it possible that the garbage collection thread is not given enough time to 
do its works before the device is rebooted?

Any solution or suggestions on what avenues to a solution would be greatly 



Chris Sperandeo
Software Engineer
Intrinsyc Software, Inc.

10th Floor, 700 West Pender St.
Vancouver, BC V6C 1G8
p. 604-646-6969
f.  604-801-6461
e. csperandeo at intrinsyc.com
w. www.intrinsyc.com

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