Hi,

First, thank you for your answers.

Charles : I already set traceMask to 0xffffffff, but I had set the MTD 
debug too... So I removed it (thanks Sergey), but I have no new messages.
I'm working with yaffs (not yaffs2).


So, here is the oops message decoded by ksymoops :

 >>PC;  00078bd0 <yaffs_FindObjectByNumber+8c/e2>   <=====

Trace; 00076dfa <yaffs_read_inode+3c/60>
Trace; 00023d58 <trap+0/6a>
Trace; 00023d58 <trap+0/6a>
Trace; 0004faa6 <get_new_inode+b0/14a>
Trace; 00023d58 <trap+0/6a>
Trace; 0004fdc4 <iget4+d2/dc>
Trace; 00023d58 <trap+0/6a>
Trace; 00076280 <yaffs_get_inode+38/40>
Trace; 00023d58 <trap+0/6a>
Trace; 000771f8 <yaffs_internal_read_super+33c/3d6>
Trace; 000772f0 <yaffs_read_super+18/1c>
Trace; 000428bc <get_sb_bdev+18c/204>
Trace; 00050f8c <alloc_vfsmnt+94/a4>
Trace; 00042ae6 <do_kern_mount+5c/104>
Trace; 00051e62 <do_add_mount+6e/13a>
Trace; 000520e2 <do_mount+120/13c>
Trace; 00051f2e <copy_mount_options+0/94>
Trace; 00051f7e <copy_mount_options+50/94>
Trace; 0005242a <sys_mount+78/c2>
Trace; 000523b2 <sys_mount+0/c2>
Trace; 00023bc6 <system_call+96/d4>

Many thanks.

Ludovic.