[Verizon Samsung Galaxy S III] BSOD2600:
Phone: Galaxy S3 VZW 32GB

Recovery: TWRP 2.7.1.0

Mod: CM11 m8

Kernel, governer, etc all CM11 stock.

Problem:

Twice today the phone rebooted itself while performing large file copy operations. last_kmsg from both reboots basically look the same:

[40996.107363] Buffer I/O error on device mmcblk0p15, logical block 6751031
[40996.114291] Buffer I/O error on device mmcblk0p15, logical block 6751032
[40996.120761] Buffer I/O error on device mmcblk0p15, logical block 6751033
[40996.127476] Buffer I/O error on device mmcblk0p15, logical block 6751034
[40996.134160] Buffer I/O error on device mmcblk0p15, logical block 6751035
[40996.140813] Buffer I/O error on device mmcblk0p15, logical block 6751036
[40996.147528] Buffer I/O error on device mmcblk0p15, logical block 6751037
[40996.154181] Buffer I/O error on device mmcblk0p15, logical block 6751038
[40996.160926] Buffer I/O error on device mmcblk0p15, logical block 6751039
[41056.701656] ACDB=> get_hw_delay: Path = 0 samplerate = 48000 usec = 0 status 0
[41056.708065] afe_callback: cmd = 0x100dc returned error = 0x3
[41056.713681] afe_send_hw_delay: config cmd failed
[41065.991721] kgsl kgsl-3d0: |kgsl_late_resume_driver| late resume start
[41066.310781] cypress_touchkey 16-0020: not real interrupt (1).
[41117.725034] EXT4-fs error (device mmcblk0p15): ext4_mb_generate_buddy:741: group 113, 644 clusters in bitmap, 530 in gd
[41117.744476] Aborting journal on device mmcblk0p15-8.
[41117.764161] Kernel panic - not syncing: EXT4-fs (device mmcblk0p15): panic forced after error
[41117.764161]
[41117.773257] [<c0013ee8>] (unwind_backtrace+0x0/0xe0) from [<c0778f40>] (panic+0x88/0x1f8)
[41117.781344] [<c0778f40>] (panic+0x88/0x1f8) from [<c01a7134>] (ext4_handle_error+0x8c/0x98)
[41117.789738] [<c01a7134>] (ext4_handle_error+0x8c/0x98) from [<c01a7ca0>] (__ext4_grp_locked_error+0xe8/0x1c4)
[41117.799626] [<c01a7ca0>] (__ext4_grp_locked_error+0xe8/0x1c4) from [<c01b6618>] (ext4_mb_generate_buddy+0x25c/0x2e8)
[41117.810125] [<c01b6618>] (ext4_mb_generate_buddy+0x25c/0x2e8) from [<c01b8620>] (ext4_mb_init_cache+0x358/0x5f0)
[41117.820288] [<c01b8620>] (ext4_mb_init_cache+0x358/0x5f0) from [<c01b8db8>] (ext4_mb_load_buddy+0x278/0x2b4)
[41117.830085] [<c01b8db8>] (ext4_mb_load_buddy+0x278/0x2b4) from [<c01ba0fc>] (ext4_mb_find_by_goal+0x3c/0x23c)
[41117.840005] [<c01ba0fc>] (ext4_mb_find_by_goal+0x3c/0x23c) from [<c01ba9e0>] (ext4_mb_regular_allocator+0x4c/0x388)
[41117.850351] [<c01ba9e0>] (ext4_mb_regular_allocator+0x4c/0x388) from [<c01bc120>] (ext4_mb_new_blocks+0x1fc/0x5c0)
[41117.860728] [<c01bc120>] (ext4_mb_new_blocks+0x1fc/0x5c0) from [<c01b31d8>] (ext4_ext_map_blocks+0xfcc/0x15ac)
[41117.870739] [<c01b31d8>] (ext4_ext_map_blocks+0xfcc/0x15ac) from [<c018cf7c>] (ext4_map_blocks+0xf8/0x2e4)
[41117.880353] [<c018cf7c>] (ext4_map_blocks+0xf8/0x2e4) from [<c0190d4c>] (mpage_da_map_and_submit+0x114/0x57c)
[41117.890241] [<c0190d4c>] (mpage_da_map_and_submit+0x114/0x57c) from [<c0191908>] (ext4_da_writepages+0x340/0x5b8)
[41117.900496] [<c0191908>] (ext4_da_writepages+0x340/0x5b8) from [<c00ff3e0>] (do_writepages+0x24/0x38)
[41117.909713] [<c00ff3e0>] (do_writepages+0x24/0x38) from [<c00f6d14>] (__filemap_fdatawrite_range+0x60/0x6c)
[41117.919419] [<c00f6d14>] (__filemap_fdatawrite_range+0x60/0x6c) from [<c00f6de8>] (filemap_write_and_wait_range+0x34/0x68)
[41117.930436] [<c00f6de8>] (filemap_write_and_wait_range+0x34/0x68) from [<c0188ab0>] (ext4_sync_file+0xb4/0x414)
[41117.940447] [<c0188ab0>] (ext4_sync_file+0xb4/0x414) from [<c0158338>] (vfs_fsync_range+0x34/0x44)
[41117.949451] [<c0158338>] (vfs_fsync_range+0x34/0x44) from [<c0158368>] (vfs_fsync+0x20/0x28)
[41117.957874] [<c0158368>] (vfs_fsync+0x20/0x28) from [<c01586a0>] (sys_fdatasync+0x18/0x34)
[41117.966115] [<c01586a0>] (sys_fdatasync+0x18/0x34) from [<c000e000>] (ret_fast_syscall+0x0/0x30)
[41117.974874] CPU1: stopping
[41117.977529] [<c0013ee8>] (unwind_backtrace+0x0/0xe0) from [<c0012f6c>] (handle_IPI+0x100/0x1cc)
[41117.986258] [<c0012f6c>] (handle_IPI+0x100/0x1cc) from [<c0008670>] (gic_handle_irq+0xa8/0xb4)
[41117.994804] [<c0008670>] (gic_handle_irq+0xa8/0xb4) from [<c000ddbc>] (__irq_usr+0x3c/0x60)
[41118.003166] Exception stack(0xcb443fb0 to 0xcb443ff8)
[41118.008141] 3fa0: 75254dc0 752a4547 000001a4 00000564
[41118.016321] 3fc0: 00002000 00000010 00000612 75252000 bea932dc 75254f00 bea932ed 7522b6e8
[41118.024531] 3fe0: 40224e24 bea93268 40211be7 4021ab9c 80010030 ffffffff
[41118.131322] Rebooting in 5 seconds..
[41123.135045] Going down for restart now
[41123.138005] msm_restart : clear reset flag

Connected via ADB and ran e2fsck, but all appears ok.

e2fsck -pcfv /dev/block/mmcblk0p15
sh: badblocks: not found
/dev/block/mmcblk0p15: Updating bad block inode.

19845 inodes used (1.13%)
1139 non-contiguous files (5.7%)
19 non-contiguous directories (0.1%)
# of inodes with ind/dind/tind blocks: 0/0/0
Extent depth histogram: 19521/116/1
6040224 blocks used (86.35%)
0 bad blocks
1 large file

17771 regular files
1861 directories
0 character device files
0 block device files
5 fifos
0 links
191 symbolic links (185 fast symbolic links)
8 sockets
--------
19836 files
~ # ?[6ne2fsck -pcfv /dev/block/mmcblk0p17
e2fsck -pcfv /dev/block/mmcblk0p17
sh: badblocks: not found
/dev/block/mmcblk0p17: Updating bad block inode.

161 inodes used (0.30%)
19 non-contiguous files (11.8%)
0 non-contiguous directories (0.0%)
# of inodes with ind/dind/tind blocks: 0/0/0
Extent depth histogram: 153
34685 blocks used (16.13%)
0 bad blocks
0 large files

147 regular files
5 directories
0 character device files
0 block device files
0 fifos
0 links
0 symbolic links (0 fast symbolic links)
0 sockets
--------
152 files

1) Did the file system already correct the previous errors, which is why none are detected now?

2) Any other commands/tests that can be run to determine really what is/was wrong?