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Kernel bug -jffs2



Hi,

While booting my embedded system I may run into the following bug depending on the order I start my applications:

----------------------------------------------------------------------------------------------------------------------
....kernel boot messages........
Checked all inodes but still 0x1e0dd8 bytes of unchecked space?
kernel BUG at gc.c:138!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000, *pmd = 00000000
Internal error: Oops: 807
CPU: 0
pc : [<c0032d20>]    lr : [<c003b09c>]    Tainted: PF
sp : c3be1ee4  ip : c3be1eb0  fp : c3be1ef4
r10: 00000000  r9 : c03641d8  r8 : c3be1f1c
r7 : c036411c  r6 : c03640ec  r5 : c3be1f0c  r4 : 00000000
r3 : 00000000  r2 : 00000001  r1 : 00000001  r0 : 00000001
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: 397F  Table: A3B14000  DAC: 00000015
Process jffs2_gcd_mtd3 (pid: 14, stack limit = 0xc3be036c)
Stack: (0xc3be1ee4 to 0xc3be2000)
1ee0:          c3be0000 c3be1f54 c3be1ef8 c009b220 c0032cec c3be1f04 c0054ca4 
1f00: c0055494 c3faa0a0 c3be1f38 00000000 c3be0000 00000000 00000000 00000000 
1f20: c3be0000 00000000 00000000 c3be0000 c3be0000 c03640ec c3be1f58 00000000 
1f40: c3c0de94 c0364000 c3be1ff4 c3be1f58 c009e220 c009b034 00000001 00000000 
1f60: 00000080 00000000 00000000 00000000 00000000 00000001 fffe67b7 ffdfdff6 
1f80: 00000000 00000000 00000013 00000000 00000000 00000000 00000000 00000000 
1fa0: 00000000 c3be1fb0 c002d84c c00377e8 00000000 00000000 00000600 00000001 
1fc0: c009e0b4 c3c0c000 00000000 c126da00 00000000 c3c0de94 c009e0b4 c3c0c000 
1fe0: 00000000 c126da00 00000000 c3be1ff8 c002f0b4 c009e0c0 fbfefff7 fff6ffff 
Backtrace: 
Function entered at [<c0032ce0>] from [<c009b220>]
 r4 = C3BE0000 
Function entered at [<c009b028>] from [<c009e220>]
Function entered at [<c009e0b4>] from [<c002f0b4>]
 r7 = C126DA00  r6 = 00000000  r5 = C3C0C000  r4 = C009E0B4
Code: 1b00208f e59f0014 eb00208d e3a03000 (e5833000) 
------------------------------------------------------------------------------------------------------------------

In the case above, my startup script starts three applications as background processes, they are all located on the jff2 filesystem:

1. The first app is QT-embedded based and requires a big dynamic library also located on the jffs2 filesystem.
2. The next app is a multithreaded app, reading a config file located on the jff2 filesystem.
3. The third app is a multithreaded app, also reading config from jff2 filesystem

I noticed that when I do not start the first App, everything works fine. Also when sleeping a second after the first application is started no error occures. I can even move the first application to start after 2 and 3 and things are working fine.
Although I can easily get around my problem, I am a bit worried for the roboustness of the system.
The target system is a PXA255 card running kernel 2.4.25 (Elinos)

MOLM




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