[Filesystems-devel] Bug#886329: Bug#886329: Bug#886329: Bug#886329: aufs-dkms: Cannot use aufs union mount with Linux 4.14.7-1: kernel BUG at /var/lib/dkms/aufs/4.14+20171218/build/fs/aufs/finfo.c:113

[intrigeri]

intrigeri:
> sfjro at users.sourceforge.net:
>> I am interested in why you set '1' to the aufs module parameter "debug".

> IIRC I added it after having noticed the bug, in the hope it would
> yield more useful information for developers to fix it.

>> If you had not set, this bug would not appear I guess. Did you see
>> something wrong without setting "debug"? And you tried debugging? If so,
>> I want to know the original problem too.

> OK, I'll retry without debug=1.

Same problem without debug=1:

 aufs 4.15-20180219
 ------------[ cut here ]------------
 kernel BUG at /root/aufs4-standalone/fs/aufs/finfo.c:113!
 invalid opcode: 0000 [#1] SMP PTI
 Modules linked in: aufs(O) iscsi_target_mod target_core_mod uinput ebtable_filter ebtables ip6table_filter ip6_tables devlink iptable_filter configfs snd_hda_codec_generic kvm_intel snd_hda_intel kvm snd_hda_codec snd_hda_core irqbypass snd_hwdep snd_pcm joydev snd_timer sg serio_raw pcspkr virtio_console snd virtio_input evdev virtio_balloon soundcore parport_pc ppdev lp parport ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb algif_skcipher af_alg dm_crypt dm_mod sr_mod cdrom ata_generic virtio_gpu ttm drm_kms_helper drm virtio_blk 8139too crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc aesni_intel ata_piix ahci aes_x86_64 crypto_simd glue_helper libahci cryptd libata uhci_hcd psmouse i2c_piix4 ehci_hcd 8139cp mii virtio_pci usbcore
  virtio_ring virtio scsi_mod usb_common floppy button
 CPU: 0 PID: 1632 Comm: ls Tainted: G           O     4.15.0-1-amd64 #1 Debian 4.15.4-1
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
 RIP: 0010:au_finfo_fin+0x55/0x60 [aufs]
 RSP: 0018:ffffba4fc07bfe68 EFLAGS: 00010202
 RAX: 0000000000000001 RBX: ffff968df5568600 RCX: 0000000000000020
 RDX: ffffffffffffffe0 RSI: ffff968e00664300 RDI: ffff968e3628c070
 RBP: ffff968e393294b0 R08: 0000000000024b40 R09: ffffffffc0adc5a0
 R10: ffffea6701e4ca40 R11: 0000000000000000 R12: ffff968e00664300
 R13: ffff968e39329480 R14: ffff968df5568600 R15: 0000000000000001
 FS:  00007f1c8e13f040(0000) GS:ffff968e3fc00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00005569e08d08c8 CR3: 0000000076600001 CR4: 00000000001606f0
 Call Trace:
  aufs_release_dir+0x101/0x130 [aufs]
  __fput+0xd8/0x210
  task_work_run+0x8a/0xb0
  exit_to_usermode_loop+0xb9/0xc0
  do_syscall_64+0x127/0x130
  entry_SYSCALL_64_after_hwframe+0x21/0x86
 RIP: 0033:0x7f1c8da27747
 RSP: 002b:00007ffe97932f10 EFLAGS: 00000206 ORIG_RAX: 0000000000000003
 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f1c8da27747
 RDX: 0000000000012740 RSI: 0000000000000000 RDI: 0000000000000003
 RBP: 0000000000000000 R08: 0000000000000000 R09: 00005569e08c8905
 R10: 000000000000016c R11: 0000000000000206 R12: 00007f1c8e13eed8
 R13: 00005569e08c8890 R14: 00005569e08c8870 R15: 0000000000000000
 Code: b2 53 6c f3 48 8b b3 c8 00 00 00 48 83 7e 50 00 75 17 8b 05 ee 30 3d f4 85 c0 75 0f 5b 48 8b 3d 02 6e 03 00 e9 dd 0b 53 f3 0f 0b <0f> 0b 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 83 c7 08 48 
 RIP: au_finfo_fin+0x55/0x60 [aufs] RSP: ffffba4fc07bfe68
 ---[ end trace 22dbca8ab81b58bd ]---

# cat /sys/module/aufs/parameters/debug 
0

Cheers,
-- 
intrigeri