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Date:   Tue, 11 Sep 2018 15:07:43 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     David Howells <dhowells@redhat.com>
Cc:     viro@zeniv.linux.org.uk, torvalds@linux-foundation.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH 14/33] vfs: Implement a filesystem superblock
 creation/configuration context [ver #11]
Message-ID: <20180911220743.GA13208@roeck-us.net>
References: <20180911174641.GA15149@roeck-us.net>
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On Tue, Sep 11, 2018 at 10:52:26PM +0100, David Howells wrote:
> > [    5.057003] RIP: 0010:reconfigure_super+0x47/0x210
> 
> Can you tell me what file and line this is?
> 
> Also, do you know which filesystem was involved?
> 
> > I don't find a more recent version of this patch in patchwork on kernel.org,
> > so I am replying to this one. My apologies if there are more recent versions.
> 
> I've just updated my tree with some fixes.  Can you try:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/
> 
> branch "fsinfo"?
> 

Unfortunately, that does not work either.
With v4.19-rc3-40-g09f0a401de37:

[    8.505130] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[    8.506237] PGD 800000001d81e067 P4D 800000001d81e067 PUD 1dfb1067 PMD 0 
[    8.506669] Oops: 0000 [#1] SMP PTI
[    8.506915] CPU: 0 PID: 1180 Comm: umount Not tainted 4.19.0-rc3+ #1
[    8.507052] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.11.2-0-gf9626ccb91-prebuilt.qemu-project.org 04/01/2014
[    8.507672] RIP: 0010:reconfigure_super+0x47/0x210
[    8.507877] Code: d4 01 00 00 44 8b a3 30 02 00 00 45 85 e4 0f 85 9d 01 00 00 a8 01 48 89 fd 75 4f 48 89 df 45 31 ed e8 ad 4f 01 00 48 8b 45 00 <48> 4
[    8.508222] RSP: 0018:ffffb3794015bdd0 EFLAGS: 00000246
[    8.508345] RAX: 0000000000000000 RBX: ffff9d855df27800 RCX: ffff9d855df278b8
[    8.508479] RDX: ffff9d855df27848 RSI: 0000000000000000 RDI: ffffffff8d54a9a8
[    8.508617] RBP: ffffb3794015be00 R08: 00000000000000d8 R09: 0000000000000000
[    8.508752] R10: ffffb3794011fce8 R11: 0000000000000001 R12: 0000000000000000
[    8.508885] R13: 0000000000000001 R14: ffff9d855effc920 R15: 0000000000000000
[    8.509056] FS:  00007f6712967500(0000) GS:ffff9d855f200000(0000) knlGS:0000000000000000
[    8.509217] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.509332] CR2: 0000000000000030 CR3: 000000001dfe0000 CR4: 00000000000006f0
[    8.509516] Call Trace:
[    8.510121]  do_umount_root+0x7b/0xb0
[    8.510244]  ksys_umount+0x250/0x3e0
[    8.510535]  ? vfs_write+0x13f/0x190
[    8.510629]  __x64_sys_umount+0xd/0x10
[    8.510722]  do_syscall_64+0x39/0xe0
[    8.510810]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Guenter