Comment 8 for bug 1726818

So the/some interesting points of dmesg.log:

[ 0.000000] random: get_random_bytes called from start_kernel+0x42/0x4e1 with crng_init=0
[ 0.000000] Linux version 4.13.0-16-generic (buildd@lcy01-02) (gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu2)) #19-Ubuntu SMP Wed Oct 11 18:35:14 UTC 2017 (Ubuntu 4.13.0-16.19-generic 4.13.4)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Centaur CentaurHauls
[ 0.000000] XSAVE consistency problem, dumping leaves
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: CPU: 0 PID: 0 at /build/linux-XO_uEE/linux-4.13.0/arch/x86/kernel/fpu/xstate.c:596 fpu__init_system_xstate+0x437/0x7f0
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.13.0-16-generic #19-Ubuntu
[ 0.000000] task: ffffffff8ec10480 task.stack: ffffffff8ec00000
[ 0.000000] RIP: 0010:fpu__init_system_xstate+0x437/0x7f0
[ 0.000000] RSP: 0000:ffffffff8ec03d88 EFLAGS: 00010082 ORIG_RAX: 0000000000000000
[ 0.000000] RAX: 0000000000000029 RBX: 000000000000000a RCX: ffffffff8ec5fcc8
[ 0.000000] RDX: 0000000000000000 RSI: 0000000000000096 RDI: 0000000000000047
[ 0.000000] RBP: ffffffff8ec03de8 R08: 6f63204556415358 R09: 0000000000000007
[ 0.000000] R10: ffffffff8ee5b7c0 R11: 0000000000000000 R12: 0000000000000340
[ 0.000000] R13: 0000000000000440 R14: ffffffff8ec03da8 R15: 0000000000000100
[ 0.000000] FS: 0000000000000000(0000) GS:ffffffff8ee7f000(0000) knlGS:0000000000000000
[ 0.000000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.000000] CR2: ffff88000008a000 CR3: 0000000006113000 CR4: 00000000000406a0
[ 0.000000] Call Trace:
[ 0.000000] ? get_cpu_cap+0x2a3/0x370
[ 0.000000] ? msr_clear_bit+0x3a/0xa0
[ 0.000000] fpu__init_system+0x1fb/0x248
[ 0.000000] early_cpu_init+0x145/0x14c
[ 0.000000] ? 0xffffffff8de00000
[ 0.000000] setup_arch+0xbf/0xcd4
[ 0.000000] ? printk+0x52/0x6e
[ 0.000000] ? early_idt_handler_array+0x120/0x120
[ 0.000000] start_kernel+0xab/0x4e1
[ 0.000000] ? early_idt_handler_array+0x120/0x120
[ 0.000000] x86_64_start_reservations+0x24/0x26
[ 0.000000] x86_64_start_kernel+0x13e/0x161
[ 0.000000] secondary_startup_64+0x9f/0x9f
[ 0.000000] Code: 0f 85 42 fd ff ff 44 3b 25 44 e9 22 00 74 2c 80 3d 32 8e f6 ff 00 75 15 48 c7 c7 68 f3 a8 8e c6 05 22 8e f6 ff 01 e8 cf 6f 03 ff <0f> ff 83 3d f5 be d7 ff 00 74 05 e8 eb b4 f8 fe 48 8b 35 47 ed
[ 0.000000] ---[ end trace 97d576cdb74ee0b3 ]---
[ 0.000000] CPUID[0d, 00]: eax=00000007 ebx=00000440 ecx=00000440 edx=00000000
...
[ 23.952218] ioc0: LSI53C1030 A0: Capabilities={Initiator}
[ 24.340974] scsi host2: ioc0: LSI53C1030 A0, FwRev=00000000h, Ports=1, MaxQ=256, IRQ=20
[ 24.720543] scsi 2:0:0:0: Direct-Access VBOX HARDDISK 1.0 PQ: 0 ANSI: 5
[ 25.360635] scsi target2:0:0: Beginning Domain Validation
[ 25.760433] floppy0: no floppy controllers found
[ 25.760450] floppy0: floppy_shutdown: timeout handler died.
[ 25.765456] scsi target2:0:0: Domain Validation skipping write tests
[ 25.765457] scsi target2:0:0: Ending Domain Validation
[ 25.765489] scsi target2:0:0: asynchronous
[ 28.065202] scsi 2:0:1:0: Direct-Access VBOX HARDDISK 1.0 PQ: 0 ANSI: 5
[ 28.274132] scsi target2:0:1: Beginning Domain Validation
[ 28.380210] scsi target2:0:1: Domain Validation skipping write tests
[ 28.860360] scsi target2:0:1: Ending Domain Validation
[ 28.905875] scsi target2:0:1: asynchronous
[ 28.956489] sd 2:0:0:0: [sda] 20971520 512-byte logical blocks: (10.7 GB/10.0 GiB)
[ 28.964136] sd 2:0:0:0: Attached scsi generic sg0 type 0
[ 28.964514] sd 2:0:1:0: Attached scsi generic sg1 type 0
[ 29.421363] sd 2:0:0:0: [sda] Write Protect is off
[ 29.561592] sd 2:0:0:0: [sda] Mode Sense: 04 00 10 00
[ 29.561653] sd 2:0:1:0: [sdb] 20480 512-byte logical blocks: (10.5 MB/10.0 MiB)
[ 29.757147] sd 2:0:0:0: [sda] Incomplete mode parameter data
[ 29.757166] sd 2:0:1:0: [sdb] Write Protect is off
[ 29.757167] sd 2:0:1:0: [sdb] Mode Sense: 04 00 10 00
[ 29.757249] sd 2:0:1:0: [sdb] Incomplete mode parameter data
[ 29.757249] sd 2:0:1:0: [sdb] Assuming drive cache: write through
[ 29.758166] sd 2:0:1:0: [sdb] Attached SCSI disk
[ 31.908285] sd 2:0:0:0: [sda] Assuming drive cache: write through
[ 32.441340] sda: sda1
[ 32.597115] sd 2:0:0:0: [sda] Attached SCSI disk
...
[ 36.033180] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
...
[ 40.452364] EXT4-fs (sda1): re-mounted. Opts: (null)
...
[ 60.954983] EXT4-fs (sda1): resizing filesystem from 576000 to 2621179 blocks
[ 60.955487] EXT4-fs (sda1): resized filesystem to 2621179
[ 61.010337] VFS: brelse: Trying to free free buffer
[ 61.114875] ------------[ cut here ]------------
[ 61.114886] WARNING: CPU: 0 PID: 683 at /build/linux-XO_uEE/linux-4.13.0/fs/buffer.c:1205 __brelse+0x21/0x30
[ 61.114887] Modules linked in: isofs ppdev crct10dif_pclmul crc32_pclmul ghash_clmulni_intel input_leds serio_raw parport_pc vboxguest video parport ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear aesni_intel mptspi scsi_transport_spi aes_x86_64 mptscsih crypto_simd cryptd glue_helper psmouse e1000 mptbase
[ 61.114917] CPU: 0 PID: 683 Comm: useradd Tainted: G W 4.13.0-16-generic #19-Ubuntu
[ 61.114918] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[ 61.114919] task: ffff91fefb6948c0 task.stack: ffffad08408d0000
[ 61.114921] RIP: 0010:__brelse+0x21/0x30
[ 61.114922] RSP: 0018:ffffad08408d3940 EFLAGS: 00010286
[ 61.114923] RAX: 0000000000000027 RBX: ffff91feffc16d00 RCX: 0000000000000000
[ 61.114924] RDX: 0000000000000000 RSI: ffff91feffc0dc78 RDI: ffff91feffc0dc78
[ 61.114925] RBP: ffffad08408d3940 R08: 0000000000000000 R09: 00000000000001f6
[ 61.114925] R10: 0000000000000040 R11: ffffffff8e882660 R12: ffff91fefa67a8f0
[ 61.114926] R13: 0000000000004106 R14: ffff91fefa5b42c8 R15: ffff91fefa5b4000
[ 61.114927] FS: 0000000000000000(0000) GS:ffff91feffc00000(0000) knlGS:0000000000000000
[ 61.114928] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 61.114929] CR2: 00007fc5178d8210 CR3: 000000007a2a9000 CR4: 00000000000406f0
[ 61.114931] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 61.114932] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 61.114933] Call Trace:
[ 61.114936] __find_get_block+0x237/0x2b0
[ 61.114938] __getblk_gfp+0x27/0x2d0
[ 61.114940] ext4_getblk+0xa9/0x190
[ 61.114942] ext4_bread+0x22/0xa0
[ 61.114944] __ext4_read_dirblock+0x34/0x260
[ 61.114946] ext4_dx_find_entry+0x91/0x180
[ 61.114948] ext4_find_entry+0x3ec/0x4f0
[ 61.114950] ? legitimize_path.isra.24+0x2e/0x60
[ 61.114951] ext4_lookup+0xc5/0x260
[ 61.114953] path_openat+0xccf/0x1630
[ 61.114956] ? filemap_map_pages+0x309/0x320
[ 61.114957] do_filp_open+0x9b/0x110
[ 61.114959] ? __check_object_size+0xaf/0x1b0
[ 61.114961] ? __alloc_fd+0xb4/0x170
[ 61.114963] do_sys_open+0x1bb/0x2b0
[ 61.114965] ? do_sys_open+0x1bb/0x2b0
[ 61.114967] ? __put_cred+0x3d/0x50
[ 61.114968] ? SyS_access+0x13d/0x230
[ 61.114970] SyS_openat+0x14/0x20
[ 61.114975] entry_SYSCALL_64_fastpath+0x1e/0xa9
[ 61.114976] RIP: 0033:0x7fc5189df130
[ 61.114977] RSP: 002b:00007ffca7c18d28 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
[ 61.114979] RAX: ffffffffffffffda RBX: 00007fc518bde500 RCX: 00007fc5189df130
[ 61.114979] RDX: 0000000000080000 RSI: 00007fc518bdea30 RDI: ffffffffffffff9c
[ 61.114980] RBP: 00007ffca7c18f00 R08: 0000000000000000 R09: 00007ffca7c18dff
[ 61.114981] R10: 0000000000000000 R11: 0000000000000287 R12: 000000006ffffdff
[ 61.114981] R13: 00007ffca7c18fe8 R14: 0000000000000801 R15: 000000037ffff1a0
[ 61.114982] Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 8b 47 60 85 c0 74 05 f0 ff 4f 60 c3 55 48 c7 c7 c0 5a ac 8e 48 89 e5 e8 90 8a e5 ff <0f> ff 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55
[ 61.115009] ---[ end trace 97d576cdb74ee0b5 ]---