Here's my understanding of this issue: In src/udiskslinuxpartitiontable.c, handle_create_partition():
1- New partition is created by calling parted 2- udisks_linux_block_object_trigger_uevent() is called to trigger udev 3- Wait for partition to show up by using wait_for_partition() 4- Wipe new partition by calling wipefs 5- udisks_linux_block_object_trigger_uevent() is called to trigger udev The problem arises because #2 and #5 aren't done synchronously. When udev processes the device change request, it removes the newly created partition device (ie: sdb1), and then adds it back again. This happens in a race with #4, and results in wipefs being called while the device is removed. This issue can be solved in a few ways, from best to worst: 1- Create a sync version of udisks_linux_block_object_trigger_uevent() that waits until the device is actually handled in #2 and #5 2- Make sure there are no pending events in the udev queue after #2 and #5 3- Adding an artificial delay after #2 and #5 to wait until the device has settled down (some places in the code add a udisks_linux_block_object_reread_partition_table(), which I assume results in enough delay to not hit the race most of the time.) I've tried removing #2 and #5 altogether, and that appeared to work also, but then gnome-disks crashes because udev hasn't added the device back fast enough after the wipefs. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to udisks2 in Ubuntu. https://bugs.launchpad.net/bugs/1460602 Title: Erasing disk failed: Error wiping newly created partition Status in udisks: Confirmed Status in udisks2 package in Ubuntu: Confirmed Status in udisks2 package in Debian: Confirmed Bug description: I tried to erase a normal 8GB USB stick on up to date Ubuntu 15.04. This dialog appeared: org.freedesktop.DBus.Python.GLib.Error: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in _message_cb retval = candidate_method(self, *args, **keywords) File "/usr/share/usb-creator/usb-creator-helper", line 287, in Format partition = table.call_create_partition_sync(0, size, '0x0c', '', no_options, None) GLib.Error: udisks-error-quark: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error wiping newly created partition /dev/sdc1: Command-line `wipefs -a "/dev/sdc1"' exited with non-zero exit status 1: wipefs: error: /dev/sdc1: probing initialization failed: No such file or directory (0) ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: usb-creator-gtk 0.2.67ubuntu0.1 ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6 Uname: Linux 3.19.0-18-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.17.2-0ubuntu1.1 Architecture: amd64 CurrentDesktop: X-Cinnamon Date: Mon Jun 1 13:20:30 2015 EcryptfsInUse: Yes InstallationDate: Installed on 2015-02-12 (108 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) SourcePackage: usb-creator UDisksDump: Error: [Errno 2] No such file or directory: 'udisks' UpgradeStatus: Upgraded to vivid on 2015-05-12 (19 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/udisks/+bug/1460602/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
