On Wed, Feb 10, 2016 at 02:58:30PM +0100, Jan Kara wrote: > When block group checksum is wrong, we call ext4_error() while holding > group spinlock from ext4_init_block_bitmap() or > ext4_init_inode_bitmap() which results in scheduling while in atomic. > Fix the issue by calling ext4_error() later after dropping the spinlock. > > CC: stable@xxxxxxxxxxxxxxx > Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Signed-off-by: Jan Kara <jack@xxxxxxx> Looks ok, so Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> --D > --- > fs/ext4/balloc.c | 7 ++++--- > fs/ext4/ialloc.c | 6 ++++-- > 2 files changed, 8 insertions(+), 5 deletions(-) > > diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c > index ec0668a60678..fe1f50fe764f 100644 > --- a/fs/ext4/balloc.c > +++ b/fs/ext4/balloc.c > @@ -191,7 +191,6 @@ static int ext4_init_block_bitmap(struct super_block *sb, > /* If checksum is bad mark all blocks used to prevent allocation > * essentially implementing a per-group read-only flag. */ > if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) { > - ext4_error(sb, "Checksum bad for group %u", block_group); > grp = ext4_get_group_info(sb, block_group); > if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) > percpu_counter_sub(&sbi->s_freeclusters_counter, > @@ -442,14 +441,16 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group) > } > ext4_lock_group(sb, block_group); > if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { > - > err = ext4_init_block_bitmap(sb, bh, block_group, desc); > set_bitmap_uptodate(bh); > set_buffer_uptodate(bh); > ext4_unlock_group(sb, block_group); > unlock_buffer(bh); > - if (err) > + if (err) { > + ext4_error(sb, "Failed to init block bitmap for group " > + "%u: %d", block_group, err); > goto out; > + } > goto verify; > } > ext4_unlock_group(sb, block_group); > diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c > index 3fcfd50a2e8a..acc0ad56bf2f 100644 > --- a/fs/ext4/ialloc.c > +++ b/fs/ext4/ialloc.c > @@ -76,7 +76,6 @@ static int ext4_init_inode_bitmap(struct super_block *sb, > /* If checksum is bad mark all blocks and inodes use to prevent > * allocation, essentially implementing a per-group read-only flag. */ > if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) { > - ext4_error(sb, "Checksum bad for group %u", block_group); > grp = ext4_get_group_info(sb, block_group); > if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) > percpu_counter_sub(&sbi->s_freeclusters_counter, > @@ -191,8 +190,11 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) > set_buffer_verified(bh); > ext4_unlock_group(sb, block_group); > unlock_buffer(bh); > - if (err) > + if (err) { > + ext4_error(sb, "Failed to init inode bitmap for group " > + "%u: %d", block_group, err); > goto out; > + } > return bh; > } > ext4_unlock_group(sb, block_group); > -- > 2.6.2 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html