Debian Bug report logs - #864798
btrfs-convert: crashes when converting ext4 drive

Toggle useless messages

Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Michael Tsang <miklcct@gmail.com>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: btrfs-convert: crashes when converting ext4 drive

Date: Thu, 15 Jun 2017 09:12:28 +0800

Package: btrfs-progs
Version: 4.7.3-1
Severity: important

Dear Maintainer,

When I tried to convert an ext4 to btrfs, the tool crashes:

create btrfs filesystem:
        blocksize: 4096
        nodesize:  16384
        features:  extref, skinny-metadata (default)
creating ext2 image file
volumes.c:985: btrfs_alloc_chunk: Assertion `ret` failed.1643]
btrfs-convert[0x41ea0b]
btrfs-convert[0x41ea32]
btrfs-convert(btrfs_alloc_chunk+0x7fe)[0x41ff1b]
btrfs-convert[0x416c1b]
btrfs-convert(btrfs_reserve_extent+0x131)[0x416df7]
btrfs-convert(btrfs_alloc_free_block+0x63)[0x41762c]
btrfs-convert[0x40ce89]
btrfs-convert(btrfs_search_slot+0x698)[0x40dc41]
btrfs-convert(btrfs_insert_empty_items+0x7a)[0x40e8ca]
btrfs-convert(btrfs_insert_inline_extent+0x82)[0x41baca]
btrfs-convert[0x431d3f]
btrfs-convert[0x432abe]
btrfs-convert(main+0x1478)[0x409606]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f7864e602b1]
btrfs-convert(_start+0x2a)[0x40a67a]




-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/6 CPU cores)
Locale: LANG=en_HK.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_HK:en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages btrfs-progs depends on:
ii  e2fslibs    1.43.4-2
ii  libblkid1   2.29.2-1
ii  libc6       2.24-11
ii  libcomerr2  1.43.4-2
ii  liblzo2-2   2.08-1.2+b2
ii  libuuid1    2.29.2-1
ii  zlib1g      1:1.2.8.dfsg-5

btrfs-progs recommends no packages.

btrfs-progs suggests no packages.

-- no debconf information

Message #10 received at submit@bugs.debian.org (full text, mbox, reply):

From: Nicholas D Steeves <nsteeves@gmail.com>

To: Michael Tsang <miklcct@gmail.com>, 864798@bugs.debian.org

Cc: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: Re: Bug#864798: btrfs-convert: crashes when converting ext4 drive

Date: Mon, 25 Sep 2017 16:09:04 -0400

[Message part 1 (text/plain, inline)]

Dear Michael,

On Thu, Jun 15, 2017 at 09:12:28AM +0800, Michael Tsang wrote:
> Package: btrfs-progs
> Version: 4.7.3-1
> Severity: important
[...]
> -- System Information:
> Debian Release: 9.0
>   APT prefers testing
>   APT policy: (990, 'testing'), (500, 'stable')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
> 
> Kernel: Linux 3.16.0-4-amd64 (SMP w/6 CPU cores)
> Locale: LANG=en_HK.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_HK:en_GB:en (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)

I'm not the maintainer of Debian's btrfs-progs, but I couldn't help
noticing that you were running linux-3.16.x (from Debian 8/jessie) at
the time of the attempted btrfs-convert operation.  It was only after
linux-4.4 that I found that anything btrfs-related became more likely
to succeed than to fail.

What happens if you try this after booting to Debian 9/stretch's 4.9.x
kernel?  Personally I wouldn't attempt to use btrfs-convert until late
2018, and only after upstream begins to recommended it as a viable
alternative to mkfs.btrfs.

That said, I'd love to be wrong, and to discover that stretch's
btrfs-progs and kernel will convert ext successfully--and more
importantly, will convert to a volume that won't self-destruct. :-)

Looking forward to hearing of your success,
Nicholas

[signature.asc (application/pgp-signature, inline)]

Message #20 received at 864798-done@bugs.debian.org (full text, mbox, reply):

From: Adam Borowski <kilobyte@angband.pl>

To: 864798-done@bugs.debian.org

Subject: almost certainly fixed

Date: Sat, 8 Jun 2019 14:50:55 +0200

In 2017, you wrote:
> When I tried to convert an ext4 to btrfs, the tool crashes:

Then Nicholas D Steeves asked if this was reproducible with stretch's kernel
and progs.

As convert has been mostly rewritten since, it's pretty likely the bug is gone
-- and that we got a new crop of fresh bugs instead.  Which, as 5.1 is
already out, it's not even that fresh anymore.

Thus, I'm closing -- if you manage to reproduce the problem, please reopen.


Meow!
-- 
⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Sometimes you benefit from delegating stuff.  For example,
⢿⡄⠘⠷⠚⠋⠀ this way I get to be a vegetarian.
⠈⠳⣄⠀⠀⠀⠀

Send a report that this bug log contains spam.