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Full Discussion: Segmentation fault while trying to recover file with extundelete
Operating Systems Linux Fedora Segmentation fault while trying to recover file with extundelete Post 303022948 by milhan on Sunday 9th of September 2018 05:54:38 PM
Old 09-09-2018
Segmentation fault while trying to recover file with extundelete
hello,

I accidentally removed a directory with its contents with rm -r and I don't have a backup. I got to know about extundelete utility on linux and downloaded on my Linux Fedora 28 notebook PC. The file system is ext4. I log in to the system as single user mode and unmount the /home directory from the partition where the file was located; in this case it is /dev/mapper/fedora-home. After I unmounted /home I ran the fsck on the partition and it was successful, but when I try to recover the directory (or a single file) I get segmentation fault like this:
Code:
/ extundelete --restore-directory /home/milhan/Desktop/path/directory /dev/mapper/fedora-home
NOTICE: Extended attributes are not restored.
Loading filesystem metadata ... 3256 groups loaded.
Loading journal descriptors ... Segmentation fault (core dumped)

extundelete gave segmentation fault no matter what file I tried to recover, whether a directory or a single file, and I am certain I entered the file path correct. I did this right after the directory or file was removed. I unmounted the /home directory immediately thus avoiding any writes to the partition. Below is my filesystem:
Code:
~ df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G   78M  3.8G   2% /dev/shm
tmpfs                    3.9G  1.5M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/fedora-root   50G   12G   35G  26% /
tmpfs                    3.9G  256K  3.9G   1% /tmp
/dev/mapper/fedora-home  401G   57G  324G  15% /home
/dev/sda1                976M  191M  718M  22% /boot
tmpfs                    790M   24K  790M   1% /run/user/1000

Thank you.
 

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LEARN ABOUT ULTRIX

systemd-gpt-auto-generator

SYSTEMD-GPT-AUTO-GENERATOR(8)				    systemd-gpt-auto-generator				     SYSTEMD-GPT-AUTO-GENERATOR(8)

NAME

       systemd-gpt-auto-generator - Generator for automatically discovering and mounting root, /home and /srv partitions, as well as discovering
       and enabling swap partitions, based on GPT partition type GUIDs.

SYNOPSIS

       /lib/systemd/system-generators/systemd-gpt-auto-generator

DESCRIPTION

       systemd-gpt-auto-generator is a unit generator that automatically discovers root, /home, /srv and swap partitions and creates mount and
       swap units for them, based on the partition type GUIDs of GUID partition tables (GPT). It implements the Discoverable Partitions
       Specification[1]. Note that this generator has no effect on non-GPT systems, or where the directories under the mount points are already
       non-empty. Also, on systems where the units are explicitly configured (for example, listed in fstab(5)), the units this generator creates
       are overridden, but additional implicit dependencies might be created.

       This generator will only look for root partitions on the same physical disk the EFI System Partition (ESP) is located on. It will only look
       for the other partitions on the same physical disk the root file system is located on. These partitions will not be searched on systems
       where the root file system is distributed on multiple disks, for example via btrfs RAID.

       systemd-gpt-auto-generator is useful for centralizing file system configuration in the partition table and making manual configuration in
       /etc/fstab or suchlike unnecessary.

       This generator looks for the partitions based on their partition type GUID. The following partition type GUIDs are identified:

       Table 1. Partition Type GUIDs
       +-------------------------------------+--------------------------------+--------------------------------------+
       |Partition Type GUID		     | Name			      | Explanation			     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |44479540-f297-41b2-9af7-d131d5f0458a | Root Partition (x86)	      | On 32-bit x86 systems, the first x86 |
       |				     |				      | root partition on the disk the EFI   |
       |				     |				      | ESP is located on is mounted to the  |
       |				     |				      | root directory /.		     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |4f68bce3-e8cd-4db1-96e7-fbcaf984b709 | Root Partition (x86-64)	      | On 64-bit x86 systems, the first     |
       |				     |				      | x86-64 root partition on the disk    |
       |				     |				      | the EFI ESP is located on is mounted |
       |				     |				      | to the root directory /.	     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |69dad710-2ce4-4e3c-b16c-21a1d49abed3 | Root Partition (32-bit ARM)    | On 32-bit ARM systems, the first ARM |
       |				     |				      | root partition on the disk the EFI   |
       |				     |				      | ESP is located on is mounted to the  |
       |				     |				      | root directory /.		     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |b921b045-1df0-41c3-af44-4c6f280d3fae | Root Partition (64-bit ARM)    | On 64-bit ARM systems, the first ARM |
       |				     |				      | root partition on the disk the EFI   |
       |				     |				      | ESP is located on is mounted to the  |
       |				     |				      | root directory /.		     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |993d8d3d-f80e-4225-855a-9daf8ed7ea97 | Root Partition (Itanium/IA-64) | On Itanium systems, the first	     |
       |				     |				      | Itanium root partition on the disk   |
       |				     |				      | the EFI ESP is located on is mounted |
       |				     |				      | to the root directory /.	     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |933ac7e1-2eb4-4f13-b844-0e14e2aef915 | Home Partition		      | The first home partition on the disk |
       |				     |				      | the root partition is located on is  |
       |				     |				      | mounted to /home.		     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |3b8f8425-20e0-4f3b-907f-1a25a76f98e8 | Server Data Partition	      | The first server data partition on   |
       |				     |				      | the disk the root partition is	     |
       |				     |				      | located on is mounted to /srv.	     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |0657fd6d-a4ab-43c4-84e5-0933c84b4f4f | Swap			      | All swap partitions located on the   |
       |				     |				      | disk the root partition is located   |
       |				     |				      | on are enabled. 		     |
       +-------------------------------------+--------------------------------+--------------------------------------+
       |c12a7328-f81f-11d2-ba4b-00a0c93ec93b | EFI System Partition (ESP)     | The first ESP located on the disk    |
       |				     |				      | the root partition is located on is  |
       |				     |				      | mounted to /boot or /efi, see below. |
       +-------------------------------------+--------------------------------+--------------------------------------+

       The /home and /srv partitions may be encrypted in LUKS format. In this case, a device mapper device is set up under the names
       /dev/mapper/home and /dev/mapper/srv. Note that this might create conflicts if the same partition is listed in /etc/crypttab with a
       different device mapper device name.

       Mount and automount units for the EFI System Partition (ESP) are generated on EFI systems. The ESP is mounted to /boot, unless a mount
       point directory /efi exists, in which case it is mounted there. Since this generator creates an automount unit, the mount will only be
       activated on-demand, when accessed. On systems where /boot (or /efi if it exists) is an explicitly configured mount (for example, listed in
       fstab(5)) or where the /boot (or /efi) mount point is non-empty, no mount units are generated.

       When using this generator in conjunction with btrfs file systems, make sure to set the correct default subvolumes on them, using btrfs
       subvolume set-default.

       systemd-gpt-auto-generator implements systemd.generator(7).

SEE ALSO

       systemd(1), systemd.mount(5), systemd.swap(5), systemd-fstab-generator(8), systemd-cryptsetup@.service(8), cryptsetup(8), fstab(5),
       btrfs(8)

NOTES

	1. Discoverable Partitions Specification
	   https://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/

systemd 237													     SYSTEMD-GPT-AUTO-GENERATOR(8)
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