Message-ID: <521DE3C1.8030304@gmail.com>
Date:	Wed, 28 Aug 2013 13:49:21 +0200
From:	Martin MOKREJŠ <mmokrejs@...il.com>
To:	linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: 3.10.9: EXT4-fs (sdb1): delayed block allocation failed for inode
 163315715 at logical offset 1 with max blocks 2 with error -5

Hi,
  I have been running two instances of valgrind on some application on 3.10.9 kernel
with a patch aiming to fix a BOS descriptor memleak (see linux-usb Subject
"[RFC v2] usbcore: compare and release one bos descriptor in usb_reset_and_verify_device()"
but I hope it is unrelated). I enabled in the kernel some extra checks for kernel
sanity in Kernel hacking section (am looking for an answer why something overwrites memory
of my python-based application). Hence the valgrind and attempts to fortify kernel a bit
more (see attached diff since last known good .config).

  Below I show when I early in the morning connected the external SATA drive drive
and that muich later, kernel suddenly lost ability to read/write the filesystem.
I somewhat suspect that laptop-mode-tools (although configured to ignore mouse/keyboard
and usb-storage devices) somehow triggered the cause. However, still I would like to see
that something happened at the SATA level.


Aug 28 04:41:05 vostro kernel: [  248.268202] ata6: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
Aug 28 04:41:05 vostro kernel: [  248.268205] ata6: irq_stat 0x00000040, connection status changed
Aug 28 04:41:05 vostro kernel: [  248.268207] ata6: SError: { DevExch }
Aug 28 04:41:05 vostro kernel: [  248.268212] ata6: hard resetting link
Aug 28 04:41:06 vostro kernel: [  249.009819] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Aug 28 04:41:06 vostro kernel: [  249.010951] ata6.00: ATA-8: ST3000VX000-1CU166, CV22, max UDMA/133
Aug 28 04:41:06 vostro kernel: [  249.010963] ata6.00: 5860533168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
Aug 28 04:41:06 vostro kernel: [  249.012058] ata6.00: configured for UDMA/133
Aug 28 04:41:06 vostro kernel: [  249.029823] ata6: EH complete
Aug 28 04:41:06 vostro kernel: [  249.030376] scsi 5:0:0:0: Direct-Access     ATA      ST3000VX000-1CU1 CV22 PQ: 0 ANSI: 5
Aug 28 04:41:06 vostro kernel: [  249.032304] sd 5:0:0:0: [sdb] 5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB)
Aug 28 04:41:06 vostro kernel: [  249.032306] sd 5:0:0:0: [sdb] 4096-byte physical blocks
Aug 28 04:41:06 vostro kernel: [  249.032623] sd 5:0:0:0: [sdb] Write Protect is off
Aug 28 04:41:06 vostro kernel: [  249.032625] sd 5:0:0:0: [sdb] Mode Sense: 00 3a 00 00
Aug 28 04:41:06 vostro kernel: [  249.032755] sd 5:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Aug 28 04:41:06 vostro kernel: [  249.033850] sd 5:0:0:0: Attached scsi generic sg2 type 0
Aug 28 04:41:06 vostro kernel: [  249.089816]  sdb: sdb1
Aug 28 04:41:06 vostro kernel: [  249.091295] sd 5:0:0:0: [sdb] Attached SCSI disk
Aug 28 04:42:51 vostro kernel: [  354.033592] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
Aug 28 09:46:39 vostro kernel: [18604.328975] ata6: exception Emask 0x10 SAct 0x0 SErr 0x4090000 action 0xe frozen
Aug 28 09:46:39 vostro kernel: [18604.328985] ata6: irq_stat 0x00400040, connection status changed
Aug 28 09:46:39 vostro kernel: [18604.328992] ata6: SError: { PHYRdyChg 10B8B DevExch }
Aug 28 09:46:39 vostro kernel: [18604.329007] ata6: hard resetting link
Aug 28 09:46:39 vostro logger: ACPI event unhandled: ac_adapter AC 00000080 00000000
Aug 28 09:46:39 vostro kernel: [18605.089011] ata6: SATA link down (SStatus 0 SControl 300)
Aug 28 09:46:40 vostro laptop-mode: Laptop mode
Aug 28 09:46:40 vostro laptop-mode: enabled, active
Aug 28 09:46:41 vostro logger: ACPI event unhandled: battery BAT0 00000080 00000001
Aug 28 09:46:41 vostro kernel: [18607.033618] ata6: hard resetting link
Aug 28 09:46:42 vostro kernel: [18607.336433] EXT4-fs (sdb1): re-mounted. Opts: commit=600
Aug 28 09:46:42 vostro kernel: [18607.381792] ata6: SATA link down (SStatus 0 SControl 300)
Aug 28 09:46:42 vostro kernel: [18607.381802] ata6: limiting SATA link speed to 1.5 Gbps
Aug 28 09:46:44 vostro logger: Device 2-1.2 is blacklisted, skipping auto suspend.
Aug 28 09:46:44 vostro logger: Device 2-1.2:1.0 is blacklisted, skipping auto suspend.
Aug 28 09:46:45 vostro logger: Device 3-2.4 is blacklisted, skipping auto suspend.
Aug 28 09:46:46 vostro logger: Device 3-2.4:1.0 is blacklisted, skipping auto suspend.
Aug 28 09:46:47 vostro kernel: [18612.387982] ata6: hard resetting link
Aug 28 09:46:47 vostro kernel: [18612.738408] ata6: SATA link down (SStatus 0 SControl 310)
Aug 28 09:46:47 vostro kernel: [18612.738418] ata6.00: disabled
Aug 28 09:46:47 vostro kernel: [18612.738435] ata6: EH complete
Aug 28 09:46:47 vostro kernel: [18612.738546] ata6.00: detaching (SCSI 5:0:0:0)
Aug 28 09:46:47 vostro kernel: [18612.881503] sd 5:0:0:0: [sdb] Synchronizing SCSI cache
Aug 28 09:46:47 vostro kernel: [18612.882157] sd 5:0:0:0: [sdb]
Aug 28 09:46:47 vostro kernel: [18612.882160] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
Aug 28 09:46:47 vostro kernel: [18612.882161] sd 5:0:0:0: [sdb] Stopping disk
Aug 28 09:46:47 vostro kernel: [18612.882196] sd 5:0:0:0: [sdb] START_STOP FAILED
Aug 28 09:46:47 vostro kernel: [18612.882197] sd 5:0:0:0: [sdb]
Aug 28 09:46:47 vostro kernel: [18612.882198] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
Aug 28 09:46:47 vostro laptop-mode: Laptop mode
Aug 28 09:46:47 vostro laptop-mode: enabled, active [unchanged]
Aug 28 09:47:44 vostro kernel: [18669.259990] ehci-pci 0000:00:1a.0: PME# enabled
Aug 28 09:50:01 vostro cron[6478]: (root) CMD (test -x /usr/sbin/run-crons && /usr/sbin/run-crons)
Aug 28 09:56:08 vostro laptop-mode: Laptop mode
Aug 28 09:56:08 vostro laptop-mode: enabled, active [unchanged]
Aug 28 09:56:08 vostro logger: ACPI event unhandled: battery BAT0 00000080 00000001
Aug 28 09:56:08 vostro laptop-mode: Laptop mode
Aug 28 09:56:08 vostro laptop-mode: enabled, active [unchanged]
Aug 28 09:56:08 vostro laptop-mode: Laptop mode
Aug 28 09:56:08 vostro laptop-mode: enabled, not active
Aug 28 09:56:09 vostro kernel: [19175.537671] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
Aug 28 09:56:10 vostro kernel: [19176.076583] ehci-pci 0000:00:1a.0: BAR 0: set to [mem 0xf7f08000-0xf7f083ff] (PCI address [0xf7f08000-0xf7f083ff])
Aug 28 09:56:10 vostro kernel: [19176.076590] ehci-pci 0000:00:1a.0: restoring config space at offset 0x3c (was 0x100, writing 0x10b)
Aug 28 09:56:10 vostro kernel: [19176.076617] ehci-pci 0000:00:1a.0: restoring config space at offset 0x4 (was 0x2900000, writing 0x2900002)
Aug 28 09:56:10 vostro kernel: [19176.089350] ehci-pci 0000:00:1a.0: PME# disabled
Aug 28 09:56:10 vostro kernel: [19176.090810] ehci-pci 0000:00:1a.0: enabling bus mastering
Aug 28 09:56:10 vostro kernel: [19176.090816] ehci-pci 0000:00:1a.0: setting latency timer to 64
Aug 28 09:56:10 vostro logger: ACPI event unhandled: battery BAT0 00000080 00000001
Aug 28 09:56:12 vostro laptop-mode: Laptop mode
Aug 28 09:56:12 vostro laptop-mode: enabled, not active [unchanged]
Aug 28 10:35:08 vostro laptop-mode: Laptop mode
Aug 28 10:35:08 vostro laptop-mode: enabled, not active [unchanged]
Aug 28 10:35:08 vostro logger: ACPI event unhandled: battery BAT0 00000080 00000001
Aug 28 10:35:08 vostro laptop-mode: Laptop mode
Aug 28 10:35:08 vostro laptop-mode: enabled, not active [unchanged]


but later on, suddenly, without any other related message in between as far as I can see:

Aug 28 11:47:39 vostro kernel: [25874.121506] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315715: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:47:39 vostro kernel: [25874.121510] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:47:39 vostro kernel: [25874.121575] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315715: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:47:39 vostro kernel: [25874.121577] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:06 vostro kernel: [25901.086360] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315715: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:06 vostro kernel: [25901.086363] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:06 vostro kernel: [25901.086423] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315715: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:06 vostro kernel: [25901.086425] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:06 vostro kernel: [25901.204905] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm memcheck-amd64-: reading directory lblock 0
Aug 28 11:48:06 vostro kernel: [25901.207692] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm memcheck-amd64-: reading directory lblock 0
Aug 28 11:48:09 vostro kernel: [25904.225075] EXT4-fs error (device sdb1): ext4_wait_block_bitmap:466: comm kworker/u8:4: Cannot read block bitmap - block_group = 19937, block_bitmap = 653262849
Aug 28 11:48:09 vostro kernel: [25904.225087] EXT4-fs (sdb1): delayed block allocation failed for inode 163315715 at logical offset 1 with max blocks 2 with error -5
Aug 28 11:48:09 vostro kernel: [25904.225089] EXT4-fs (sdb1): This should not happen!! Data will be lost
Aug 28 11:48:12 vostro kernel: [25907.013801] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315715: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:12 vostro kernel: [25907.013805] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:12 vostro kernel: [25907.013871] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315715: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:12 vostro kernel: [25907.013873] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:12 vostro kernel: [25907.015685] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:12 vostro kernel: [25907.015687] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:12 vostro kernel: [25907.015714] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:12 vostro kernel: [25907.015716] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:12 vostro kernel: [25907.015733] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:12 vostro kernel: [25907.015734] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:12 vostro kernel: [25907.018138] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:12 vostro kernel: [25907.018140] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:12 vostro kernel: [25907.018157] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:12 vostro kernel: [25907.018159] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:12 vostro kernel: [25907.018906] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm memcheck-amd64-: reading directory lblock 0
Aug 28 11:48:13 vostro kernel: [25908.368826] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:13 vostro kernel: [25908.368829] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:13 vostro kernel: [25908.368859] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:13 vostro kernel: [25908.368860] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:13 vostro kernel: [25908.368878] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:13 vostro kernel: [25908.368879] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:13 vostro kernel: [25908.369287] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:13 vostro kernel: [25908.369290] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:13 vostro kernel: [25908.369307] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:13 vostro kernel: [25908.369308] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:13 vostro kernel: [25908.370318] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:13 vostro kernel: [25908.370320] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:13 vostro kernel: [25908.370338] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:13 vostro kernel: [25908.370339] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:14 vostro kernel: [25909.243747] EXT4-fs error (device sdb1): ext4_wait_block_bitmap:466: comm kworker/u8:4: Cannot read block bitmap - block_group = 19937, block_bitmap = 653262849
Aug 28 11:48:14 vostro kernel: [25909.243759] EXT4-fs (sdb1): delayed block allocation failed for inode 163315715 at logical offset 3 with max blocks 1 with error -5
Aug 28 11:48:14 vostro kernel: [25909.243761] EXT4-fs (sdb1): This should not happen!! Data will be lost
Aug 28 11:48:14 vostro kernel: [25909.641975] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:14 vostro kernel: [25909.641978] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:48:14 vostro kernel: [25909.642007] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #163315716: block 653262880: comm memcheck-amd64-: unable to read itable block
Aug 28 11:48:14 vostro kernel: [25909.642008] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure


[cut]

Aug 28 11:49:29 vostro kernel: [25984.053680] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:49:29 vostro kernel: [25984.053757] EXT4-fs error (device sdb1): __ext4_get_inode_loc:4039: inode #55836687: block 223346720: comm memcheck-amd64-: unable to read itable block
Aug 28 11:49:29 vostro kernel: [25984.053758] EXT4-fs error (device sdb1) in ext4_reserve_inode_write:4973: IO failure
Aug 28 11:49:29 vostro kernel: [25984.082439] EXT4-fs error (device sdb1): ext4_wait_block_bitmap:466: comm memcheck-amd64-: Cannot read block bitmap - block_group = 19937, block_bitmap = 653262849
Aug 28 11:49:29 vostro kernel: [25984.082452] EXT4-fs (sdb1): delayed block allocation failed for inode 55836688 at logical offset 1 with max blocks 3 with error -5
Aug 28 11:49:29 vostro kernel: [25984.082453] EXT4-fs (sdb1): This should not happen!! Data will be lost
Aug 28 11:49:29 vostro kernel: [25984.082616] EXT4-fs error (device sdb1): ext4_wait_block_bitmap:466: comm memcheck-amd64-: Cannot read block bitmap - block_group = 374, block_bitmap = 12058630
Aug 28 11:49:29 vostro kernel: [25984.082622] EXT4-fs (sdb1): delayed block allocation failed for inode 55836687 at logical offset 1 with max blocks 243 with error -5
Aug 28 11:49:29 vostro kernel: [25984.082623] EXT4-fs (sdb1): This should not happen!! Data will be lost
Aug 28 11:50:01 vostro cron[8131]: (root) CMD (test -x /usr/sbin/run-crons && /usr/sbin/run-crons)
Aug 28 11:57:40 vostro kernel: [26476.360211] Aborting journal on device sdb1-8.
Aug 28 11:57:40 vostro kernel: [26476.360222] Buffer I/O error on device sdb1, logical block 365985792
Aug 28 11:57:40 vostro kernel: [26476.360223] lost page write due to I/O error on sdb1
Aug 28 11:57:40 vostro kernel: [26476.360226] JBD2: Error -5 detected when updating journal superblock for sdb1-8.
Aug 28 11:57:55 vostro kernel: [26491.416007] EXT4-fs error (device sdb1): __ext4_journal_start_sb:62: Detected aborted journal
Aug 28 11:57:55 vostro kernel: [26491.416014] EXT4-fs (sdb1): Remounting filesystem read-only
Aug 28 11:57:55 vostro kernel: [26491.416017] EXT4-fs (sdb1): ext4_da_writepages: jbd2_start: 13312 pages, ino 55836687; err -30

So kernel was trying for 10 minutes before it gave up?

[cut, please of these repeated messages]

Aug 28 12:56:31 vostro kernel: [30013.996669] EXT4-fs warning (device sdb1): __ext4_read_dirblock:908: error reading directory block (ino 163315713, block 0)
Aug 28 12:56:33 vostro kernel: [30015.310284] EXT4-fs warning (device sdb1): __ext4_read_dirblock:908: error reading directory block (ino 163315713, block 0)
Aug 28 12:56:33 vostro kernel: [30015.526548] EXT4-fs warning (device sdb1): __ext4_read_dirblock:908: error reading directory block (ino 163315713, block 0)
Aug 28 12:56:36 vostro kernel: [30018.490206] EXT4-fs warning (device sdb1): __ext4_read_dirblock:908: error reading directory block (ino 163315713, block 0)
Aug 28 12:56:36 vostro kernel: [30018.730504] EXT4-fs warning (device sdb1): __ext4_read_dirblock:908: error reading directory block (ino 163315713, block 0)
Aug 28 12:56:36 vostro kernel: [30018.898683] EXT4-fs warning (device sdb1): __ext4_read_dirblock:908: error reading directory block (ino 163315713, block 0)
Aug 28 12:56:42 vostro kernel: [30024.101650] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm ls: reading directory lblock 0
Aug 28 12:56:42 vostro kernel: [30024.101696] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm ls: reading directory lblock 0
Aug 28 12:56:42 vostro kernel: [30024.101729] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm ls: reading directory lblock 0
Aug 28 12:56:42 vostro kernel: [30024.102016] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm ls: reading directory lblock 0
Aug 28 12:56:42 vostro kernel: [30024.102175] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm ls: reading directory lblock 0
Aug 28 12:56:42 vostro kernel: [30024.102337] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm ls: reading directory lblock 0
Aug 28 12:56:42 vostro kernel: [30024.102494] EXT4-fs error (device sdb1): ext4_find_entry:1309: inode #163315713: comm ls: reading directory lblock 0
Aug 28 12:56:42 vostro kernel: [30024.103131] EXT4-fs warning (device sdb1): __ext4_read_dirblock:908: error reading directory block (ino 163315713, block 0)


I could imagine valgrind took too much memory and maybe overwrote some kernel structures? Or some of the new changes in .config?

I ran two instances of: valgrind --leak-check=full --track-origins=yes --tool=memcheck --suppressions=valgrind-python.supp my_app_compiled_by_cython_and_gcc [args]

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       573G  533G   12G  98% /
devtmpfs        7.8G     0  7.8G   0% /dev
tmpfs           1.6G  3.0M  1.6G   1% /run
shm             7.8G     0  7.8G   0% /dev/shm
/dev/sdb1       2.7T  1.4T  1.3T  53% /mnt/external
$ ls -la  /mnt/external
ls: reading directory /mnt/external: Input/output error
total 0
$

So, the target filesystem on the external disk should not be full.

Any clues what I should look at? Few days ago memtest86+ went fine through all 16GB of RAM (Dell Vostro 3550). I do not know if the PCI/ACPI change is related or not. 
Thank you,
Martin


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