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If the filesystem mounts with the replace-operation in a suspended state and try to cancel the suspended replace-operation, we hit the assert. The assert came from the commitfe97e2e173("btrfs: dev-replace: replace's scrub must not be running in suspended state") that was actually not required. So just remove it. $ mount /dev/sda5 /btrfs BTRFS info (device sda5): cannot continue dev_replace, tgtdev is missing BTRFS info (device sda5): you may cancel the operation after 'mount -o degraded' $ mount -o degraded /dev/sda5 /btrfs <-- success. $ btrfs replace cancel /btrfs kernel: assertion failed: ret != -ENOTCONN, in fs/btrfs/dev-replace.c:1131 kernel: ------------[ cut here ]------------ kernel: kernel BUG at fs/btrfs/ctree.h:3750! After the patch: $ btrfs replace cancel /btrfs BTRFS info (device sda5): suspended dev_replace from /dev/sda5 (devid 1) to <missing disk> canceled Fixes:fe97e2e173("btrfs: dev-replace: replace's scrub must not be running in suspended state") CC: stable@vger.kernel.org # 5.0+ Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.