[Galaxy Note5 Q&A, Help & Troubleshooting] @Class:
last_kmsg.txt:

https://drive.google.com/file/d/0B8l6BzXcGjjma0ZqdElhTGtUTHc/view?usp=sharing

Looks like the crash occurred near:

<3>[ 29.939533] [4: jbd2/sda16-8: 2943] Aborting journal on device sda16-8.
<3>[ 29.939564] [4: jbd2/sda16-8: 2943] Buffer I/O error on device sda16, logical block 65536
<4>[ 29.939584] [4: jbd2/sda16-8: 2943] lost page write due to I/O error on sda16
<3>[ 29.939604] [4: jbd2/sda16-8: 2943] JBD2: Error -5 detected when updating journal superblock for sda16-8.
<4>[ 29.939653] [4: jbd2/sda16-8: 2943] EXT4-fs (sda16): discard request in group:33 block:1454 count:213 failed with -5
<4>[ 29.939686] [4: jbd2/sda16-8: 2943] EXT4-fs (sda16): discard request in group:417 block:198 count:1 failed with -5
<3>[ 29.949256] [7: kworker/u16:6: 1686] Buffer I/O error on device sda16, logical block 0
<4>[ 29.949277] [7: kworker/u16:6: 1686] lost page write due to I/O error on sda16
<2>[ 29.949296] [7: kworker/u16:6: 1686] EXT4-fs error (device sda16): __ext4_journal_start_sb:62: Detected aborted journal
<2>[ 29.949316] [7: kworker/u16:6: 1686] EXT4-fs (sda16): Remounting filesystem read-only
<0>[ 29.949334] [7: kworker/u16:6: 1686] Kernel panic - not syncing: EXT4-fs panic from previous error
<0>[ 29.949334] [7: kworker/u16:6: 1686]
<0>[ 29.949371] [7: kworker/u16:6: 1686] s3c2410-wdt 10020000.watchdog: watchdog is stopped
<4>[ 29.949394] [7: kworker/u16:6: 1686] CPU: 7 PID: 1686 Comm: kworker/u16:6 Not tainted 3.10.61-5412543 #1
<4>[ 29.949422] [7: kworker/u16:6: 1686] Workqueue: writeback bdi_writeback_workfn (flush-8:0)
<4>[ 29.949441] [7: kworker/u16:6: 1686] Call trace:
<4>[ 29.949466] [7: kworker/u16:6: 1686] [<ffffffc00020da90>] dump_backtrace+0x0/0x110
<4>[ 29.949486] [7: kworker/u16:6: 1686] [<ffffffc00020dbb0>] show_stack+0x10/0x1c
<4>[ 29.949508] [7: kworker/u16:6: 1686] [<ffffffc000a046d0>] dump_stack+0x1c/0x28
<4>[ 29.949527] [7: kworker/u16:6: 1686] [<ffffffc000a023d0>] panic+0xe8/0x220
<4>[ 29.949550] [7: kworker/u16:6: 1686] [<ffffffc000381af0>] __ext4_abort+0x108/0x11c
<4>[ 29.949569] [7: kworker/u16:6: 1686] [<ffffffc00038f75c>] __ext4_journal_start_sb+0x11c/0x158
<4>[ 29.949591] [7: kworker/u16:6: 1686] [<ffffffc0003711e8>] ext4_da_writepages+0x288/0x4f0
<4>[ 29.949613] [7: kworker/u16:6: 1686] [<ffffffc0002b42e8>] do_writepages+0x24/0x40
<4>[ 29.949630] [7: kworker/u16:6: 1686] [<ffffffc00030af84>] __writeback_single_inode+0xb0/0x2a0
<4>[ 29.949648] [7: kworker/u16:6: 1686] [<ffffffc00030c03c>] writeback_sb_inodes+0x1c0/0x35c
<4>[ 29.949664] [7: kworker/u16:6: 1686] [<ffffffc00030c254>] __writeback_inodes_wb+0x7c/0xc4
<4>[ 29.949681] [7: kworker/u16:6: 1686] [<ffffffc00030c420>] wb_writeback+0x184/0x2fc
<4>[ 29.949698] [7: kworker/u16:6: 1686] [<ffffffc00030c91c>] wb_do_writeback+0x19c/0x21c
<4>[ 29.949715] [7: kworker/u16:6: 1686] [<ffffffc00030ca1c>] bdi_writeback_workfn+0x80/0x1e8
<4>[ 29.949734] [7: kworker/u16:6: 1686] [<ffffffc00023c9c4>] process_one_work+0x274/0x3ec
<4>[ 29.949752] [7: kworker/u16:6: 1686] [<ffffffc00023d9bc>] worker_thread+0x1f8/0x318
<4>[ 29.949773] [7: kworker/u16:6: 1686] [<ffffffc000242d58>] kthread+0xac/0xb8
<4>[ 29.949791] [7: kworker/u16:6: 1686] Sched Debug Version: v0.10, 3.10.61-5412543 #1
<4>[ 29.949808] [7: kworker/u16:6: 1686] ktime : 29940.780597
<4>[ 29.949825] [7: kworker/u16:6: 1686] sched_clk : 29949.787718
<4>[ 29.949841] [7: kworker/u16:6: 1686] cpu_clk : 29949.787843
<4>[ 29.949857] [7: kworker/u16:6: 1686] jiffies : 4294940290

There are lines closer to the top with complaints about the file system...