Comment # 20 on bug 1160604 from Guillaume GARDET

(gdb) l *submit_compressed_extents+0x4c
0x42748 is in submit_compressed_extents (../fs/btrfs/inode.c:845).
840      * and send them down to the disk.
841      */
842     static noinline void submit_compressed_extents(struct async_chunk
*async_chunk)
843     {
844             struct btrfs_inode *inode = BTRFS_I(async_chunk->inode);
845             struct btrfs_fs_info *fs_info = inode->root->fs_info;
846             struct async_extent *async_extent;
847             u64 alloc_hint = 0;
848             struct btrfs_key ins;
849             struct extent_map *em;