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Message-ID: <0000000000004efde50620cbf13b@google.com>
Date: Wed, 28 Aug 2024 22:42:39 -0700
From: syzbot <syzbot+ba3c0273042a898c230e@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [btrfs?] kernel BUG in __extent_writepage_io
(2)
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***
Subject: Re: [syzbot] [btrfs?] kernel BUG in __extent_writepage_io (2)
Author: lizhi.xu@...driver.com
#syz test
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 10ac5f657e38..397eee4c4217 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -384,6 +384,7 @@ static void try_merge_map(struct btrfs_inode *inode, struct extent_map *em)
free_extent_map(merge);
dec_evictable_extent_maps(inode);
}
+ printk("em: %p, blockstart: %llu, mblockstart: %llu, %s\n", em, extent_map_block_start(em), extent_map_block_start(merge), __func__);
}
/*
@@ -493,7 +494,11 @@ static int add_extent_mapping(struct btrfs_inode *inode,
if (ret)
return ret;
+ printk("em: %p, blockstart: %llu, em refs: %d, %s\n",
+ em, extent_map_block_start(em), refcount_read(&em->refs), __func__);
setup_extent_mapping(inode, em, modified);
+ printk("setuped, em: %p, blockstart: %llu, em refs: %d, %s\n",
+ em, extent_map_block_start(em), refcount_read(&em->refs), __func__);
if (!btrfs_is_testing(fs_info) && is_fstree(btrfs_root_id(root)))
percpu_counter_inc(&fs_info->evictable_extent_maps);
@@ -743,6 +748,8 @@ int btrfs_add_extent_mapping(struct btrfs_inode *inode,
}
free_extent_map(existing);
}
+ } else if (!ret) {
+ ASSERT(extent_map_block_start(em) != EXTENT_MAP_HOLE);
}
ASSERT(ret == 0 || ret == -EEXIST);
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 5154a8f1d26c..a84ef0c7d601 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -154,6 +154,7 @@ static inline u64 extent_map_block_start(const struct extent_map *em)
if (em->disk_bytenr < EXTENT_MAP_LAST_BYTE) {
if (extent_map_is_compressed(em))
return em->disk_bytenr;
+ printk("em: %p, disk byte nr: %llu, offset: %llu, %s\n", em, em->disk_bytenr, em->offset, __func__);
return em->disk_bytenr + em->offset;
}
return em->disk_bytenr;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b1b6564ab68f..45f3b31aacc3 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6958,7 +6958,9 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
}
write_lock(&em_tree->lock);
+ printk("em: %p, blockstart: %llu, start: %llu, len: %llu, %s\n", em, extent_map_block_start(em), start, len, __func__);
ret = btrfs_add_extent_mapping(inode, &em, start, len);
+ printk("ret: %d, em: %p, blockstart: %llu, start: %llu, len: %llu, %s\n", ret, em, extent_map_block_start(em), start, len, __func__);
write_unlock(&em_tree->lock);
out:
btrfs_free_path(path);
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