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Date:	Thu, 28 May 2015 00:27:29 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 89621] EXT4-fs error (device dm-1):
 ext4_mb_release_inode_pa:3773: group 24089, free 34, pa_free 32

https://bugzilla.kernel.org/show_bug.cgi?id=89621

--- Comment #11 from Theodore Tso <tytso@....edu> ---
Why are you still using v3.16.0?    The latest 3.16 kernel is v3.16.7.  I
believe the bug in question was fixed in a backport that first showed up in
v3.16.2:

commit 868be28e321b764da29592cfd9fd659434e823aa
Author: Theodore Ts'o <tytso@....edu>
Date:   Wed Jul 30 22:17:17 2014 -0400

    ext4: fix ext4_discard_allocated_blocks() if we can't allocate the pa
struct

    commit 86f0afd463215fc3e58020493482faa4ac3a4d69 upstream.

    If there is a failure while allocating the preallocation structure, a
    number of blocks can end up getting marked in the in-memory buddy
    bitmap, and then not getting released.  This can result in the
    following corruption getting reported by the kernel:

    EXT4-fs error (device sda3): ext4_mb_generate_buddy:758: group 1126,
    12793 clusters in bitmap, 12729 in gd

    In that case, we need to release the blocks using mb_free_blocks().

    Tested: fs smoke test; also demonstrated that with injected errors,
        the file system is no longer getting corrupted

    Google-Bug-Id: 16657874

    Signed-off-by: "Theodore Ts'o" <tytso@....edu>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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