Comment 0 for bug 706795

Terminated suspend causes ext4 corruptions which crashes kernel on mount attempt.

Affects Karmic, Lucid Maverick and probably Natty.
Valid for any combinations, for example : Suspend Lucid system -> Hard poweroff -> Connect Lucid's ext4 to Maverick system -> Observe Crash

Actually report describes two severe issues as one.

As immediate solution I propose:

1) Migration of filesystem recovery to initramfs-tools. Will help system to recover it self before root mounted.
2) Fix resume from suspend while bootdevice on USB.

Usually happens on systems with bootdevice on USB.
When system returns from suspend, there is a chance of ~25% for EXT4 on USB to become readonly with corrupted journal.
To fix affected EXT4, de-activation of auto-mount required or else you will observer as below:

[225221.546381] usb-storage: device found at 22
[225221.546386] usb-storage: waiting for device to settle before scanning
[225226.551130] usb-storage: device scan complete
[225226.555578] scsi 11:0:0:0: Direct-Access Generic Flash HS-CF 4.44 PQ: 0 ANSI: 0
[225226.558965] scsi 11:0:0:1: Direct-Access Generic Flash HS-COMBO 4.44 PQ: 0 ANSI: 0
[225226.560622] sd 11:0:0:0: Attached scsi generic sg2 type 0
[225226.562393] sd 11:0:0:1: Attached scsi generic sg3 type 0
[225226.622322] sd 11:0:0:0: [sdc] Attached SCSI removable disk
[225226.626721] sd 11:0:0:1: [sdd] Attached SCSI removable disk
[225233.188100] usb 1-2: new high speed USB device using ehci_hcd and address 5
[225233.323593] usb 1-2: configuration #1 chosen from 1 choice
[225233.324302] scsi12 : SCSI emulation for USB Mass Storage devices
[225233.324731] usb-storage: device found at 5
[225233.324741] usb-storage: waiting for device to settle before scanning
[225238.320747] usb-storage: device scan complete
[225238.322831] scsi 12:0:0:0: Direct-Access USB Mass Storage Device PQ: 0 ANSI: 0 CCS
[225238.324132] sd 12:0:0:0: Attached scsi generic sg4 type 0
[225238.325568] sd 12:0:0:0: [sde] 15954944 512-byte logical blocks: (8.16 GB/7.60 GiB)
[225238.326653] sd 12:0:0:0: [sde] Write Protect is off
[225238.326661] sd 12:0:0:0: [sde] Mode Sense: 03 00 00 00
[225238.326667] sd 12:0:0:0: [sde] Assuming drive cache: write through
[225238.334023] sd 12:0:0:0: [sde] Assuming drive cache: write through
[225238.334044] sde: sde1
[225238.338676] sd 12:0:0:0: [sde] Assuming drive cache: write through
[225238.338693] sd 12:0:0:0: [sde] Attached SCSI removable disk
[225252.842616] EXT4-fs warning (device sde1): ext4_clear_journal_err: Filesystem error recorded from previous mount: IO failure
[225252.842629] EXT4-fs warning (device sde1): ext4_clear_journal_err: Marking fs in need of filesystem check.
[225252.842674] BUG: unable to handle kernel paging request at 02add000
[225252.842684] IP: [<c035c35a>] __percpu_counter_sum+0x2a/0x70
[225252.842701] *pde = 00000000
[225252.842707] Oops: 0000 [#1] SMP
[225252.842714] last sysfs file: /sys/devices/pci0000:00/0000:00:0b.0/host1/target1:0:0/1:0:0:0/block/sdb/sdb3/stat
[225252.842722] Modules linked in: btrfs zlib_deflate crc32c libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs reiserfs hidp aes_i586 aes_generic binfmt_misc ppdev rfcomm sco bridge stp bnep l2cap ip6table_filter ip6_tables iptable_filter ip_tables x_tables dm_crypt snd_hda_codec_nvhdmi snd_hda_codec_realtek nfsd exportfs snd_hda_intel nfs snd_hda_codec lockd snd_hwdep nfs_acl auth_rpcgss snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss lm90 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq vga16fb sunrpc coretemp vgastate nvidia(P) snd_timer snd_seq_device snd agpgart soundcore btusb i2c_nforce2 gspca_zc3xx lp gspca_main snd_page_alloc videodev ftdi_sio shpchp parport v4l1_compat bluetooth usbserial usb_storage raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor async_memcpy async_tx raid0 multipath linear dm_raid45 xor usbhid hid fbcon tileblit font bitblit softcursor vesafb raid1 ahci forcedeth ramzswap xvmalloc lzo_decompress lzo_compress
[225252.842886]
[225252.842894] Pid: 14666, comm: mount Tainted: P (2.6.32-28-generic #55-Ubuntu) To Be Filled By O.E.M.
[225252.842901] EIP: 0060:[<c035c35a>] EFLAGS: 00010297 CPU: 0
[225252.842909] EIP is at __percpu_counter_sum+0x2a/0x70
[225252.842914] EAX: 00000000 EBX: 00000000 ECX: 02add000 EDX: 00000000
[225252.842920] ESI: 00000000 EDI: ea39ec94 EBP: f0085d78 ESP: f0085d6c
[225252.842926] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[225252.842933] Process mount (pid: 14666, ti=f0084000 task=f02d5940 task.ti=f0084000)
[225252.842938] Stack:
[225252.842941] f5c4c000 03477fda 00000000 f0085dac c02a3856 e6984400 f0085d94 c058bf3e
[225252.842955] <0> 00000001 e6984400 03476c6a 00000000 f6e022c0 f5c4c000 dd309000 e6984400
[225252.842971] <0> f0085de4 c02a3a33 f5c4c000 c05a978d c06d59dc c06e4685 dd309000 f0085de4
[225252.842987] Call Trace:
[225252.842998] [<c02a3856>] ? ext4_commit_super+0xd6/0x1e0
[225252.843008] [<c058bf3e>] ? printk+0x1d/0x1f
[225252.843017] [<c02a3a33>] ? ext4_clear_journal_err+0xa3/0xd0
[225252.843026] [<c02cce5f>] ? jbd2_journal_load+0x4f/0xb0
[225252.843035] [<c02a5f0f>] ? ext4_load_journal+0x14f/0x2e0
[225252.843044] [<c02a71b6>] ? ext4_fill_super+0x1116/0x1930
[225252.843055] [<c020c172>] ? get_sb_bdev+0x162/0x1a0
[225252.843063] [<c02a60a0>] ? ext4_fill_super+0x0/0x1930
[225252.843072] [<c02a16f6>] ? ext4_get_sb+0x26/0x30
[225252.843080] [<c02a60a0>] ? ext4_fill_super+0x0/0x1930
[225252.843087] [<c020bce7>] ? vfs_kern_mount+0x67/0x170
[225252.843097] [<c0220623>] ? get_fs_type+0x33/0xb0
[225252.843105] [<c020be4e>] ? do_kern_mount+0x3e/0xe0
[225252.843113] [<c0223763>] ? do_mount+0x1c3/0x200
[225252.843120] [<c022380b>] ? sys_mount+0x6b/0xa0
[225252.843130] [<c01033ec>] ? syscall_call+0x7/0xb
[225252.843139] [<c0590000>] ? setjmp_pre_handler+0x30/0x90
[225252.843144] Code: 00 55 89 e5 57 89 c7 56 53 e8 23 24 23 00 8b 5f 04 b8 ff ff ff ff 8b 77 08 eb 1c 8d b6 00 00 00 00 8b 0c 85 00 3f 7a c0 8b 57 14 <8b> 14 0a 89 d1 c1 f9 1f 01 d3 11 ce 8d 48 01 a1 0c c0 59 c0 ba
[225252.843225] EIP: [<c035c35a>] __percpu_counter_sum+0x2a/0x70 SS:ESP 0068:f0085d6c
[225252.843236] CR2: 0000000002add000
[225252.843243] ---[ end trace 2bc710c0004faec8 ]---