Hi,

Finally I could do a test with the patch applied. It seems that I hit
the same BUG as the output looks the exact same as before.

I transcribed the entire dmesg trace just in case I missed something
(attached). Hope it helps!

Thanks,
François.

On Fri, 2014-01-24 at 16:24 +0100, François wrote:
> On Sat, 2014-01-25 at 00:15 +0900, sf...@users.sourceforge.net wrote: 
> > > Right. Everytime I try something new, I apply all patches and copy the
> > > directories to my kernel sources and recompile the entire kernel, just
> > > to be sure.
> > 
> > Hmm...
> > Then it might be a brand new problem.
> > Would you apply this patch and try reproducing?
> > This patch doesn't fix any problem, but produces an error msg.
> > I need to know where it happend (as a line number in source file).
> 
> 
> Of course, already compiling! It will take some time but I'll post the
> result as soon as I can (at most on monday).
> 
> 
> 
> > > To be clear, the "aufs" module is not compiled standalone, but directly
> > > within the kernel.
> > 
> > ??
> > You compiled aufs as a module by
> > CONFIG_AUFS_FS=m, right?
> > Or the word "standalone" differs between us?
> 
> Yes it was compiled as a module. What I meant was that I include the
> aufs sources inside my kernel tree and recompile everything at once
> (instead of compiling just the module).
> 
> 
> 
> > > Sorry I missed that part. It's difficult because the issue happens in
> > > initramfs when trying to load the root FS, so I have to transcribe
> > > everything by hand...
> > 
> > Thanks.
> 
> I'm the one that should thank you for this project and your support!
> 
> 
> Regards,
> François.
> 
> 
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aufs 3.10.x-20140120
loop: AES key scrubbing enabled
loop: loaded (max 8 devices)
squashfs: versio n4.0 (2009/01/31) Phillip Lougher
BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
IP: [<ffffffffa00d96bf>] au_test_loopback_overlap+0x34/0x59 [aufs]
PGD 3664067 PUD 3682067 PMD 0
Oops: 0000 [#1] SMP
Modules linked in: squashfs loop(0) aufs nls_utf8 isofs cmuuid(0) sg sr_mod 
cdrom ata_generic ata_piix floppy e1000 libata scsi_mod
CPU: 0 PID: 295 Comm: exe Tainted: G           0 3.10.27 #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
task: ffff8800034d20c0 ti: ffff880003680000 task.ti: ffff88000368000
RPI: 0010:[<ffffffffa00d96bf>]  [<ffffffffa00d96bf>] 
au_test_loopback_overlap+0x34/0x59 [aufs]
RSP: 0018:ffff880003681c28  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8800034dc068 RCS: 0000000000000007
RDX: ffff88000362c400 RSI: ffff88000362c800 RDI: ffff88000362c400
RBP: ffff88000362c400 R08: ffff88000631aa40 R09: ffff88000631aa00
R10: ffff8800035d9ca0 R11: ffff8800035a30a0 R12: ffff880006324d38
R13: 0000000000000000 R14: ffff8800034dc000 R15: ffff88000631f0c0
FS:  00007fb1f6641700(0000) GS:ffff880006e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 0000000003514000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 000000000fff0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffffffffa00c2527 ffff8800034dc080 ffffffffa00c71a7
 ffff880003681d01 ffff88000346dfc0 0000000000000282 ffffffffa00c6319
 ffff880003681d78 0000000000000001 ffff88000362c400 ffff88000362c800
Call Trace:
 [<ffffffffa00c2527>] ? au_br_add+0x309/0x7ba [aufs]
 [<ffffffffa00c41a7>] ? vfsub_kern_path+0x29/0x2f [aufs]
 [<ffffffffa00c6319>] ? au_opts_parse+0x7bd/0x806 [aufs]
 [<ffffffffa00c4d64>] ? au_opt_br+0x47/0x95 [aufs]
 [<ffffffffa00c5254>] ? au_opts_mount+0x82/0x1d5 [aufs]
 [<ffffffffa00c0b68>] ? aufs_fill_super+0x1cc/0x264 [aufs]
 [<ffffffffa00c099c>] ? au_iget_locked+0x4e/0x4e [aufs]
 [<ffffffff81115c98>] ? mount_nodev+0x41/0x76
 [<ffffffffa00bf926>] ? aufs_mount+0x13/0x8c [aufs]
 [<ffffffff81115ae8>] ? mount_fs+0x6c/0x149
 [<ffffffff8112b436>] ? vsf_kern_mount+0x67/0xdd
 [<ffffffff8112bc54>] ? do_mount+0x77f/0x8dd
 [<ffffffff8112be3a>] ? SyS_mount+0x88/0xc3
 [<ffffffff813ad469>] ? system_call_fastpath+0x16/0x1b
Code: c0 48 89 fa 8b 4e 10 c1 e9 14 83 f9 07 75 3c 48 8b 86 20 01 00 00 48 8b 
80 98 00 00 00 48 8b 80 58 03 00 00 48 8b 80 f0 00 00 00 <48> 8b 78 18 b8 01 00 
00 00 48 39 57 68 74 11 48 8b 72 60 e8 10
RIP  [<ffffffffa00d96bf>] au_test_loopback_overlap+0x34/0x59 [aufs]
 RSP <ffff880003681c28>
CR2: 0000000000000018
---[ end trace 146ba0eb9c81b103 ]---
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