我正在使用jnr-fuse庫(https://github.com/SerCeMan/jnr-fuse)在java中編寫Fuse-Filesystem，它在內部使用JNR進行本機訪問。

文件系統作為Amazon S3存儲桶的前端，基本上允許用戶將其存儲桶作為普通存儲設備安裝。

在重新處理我的read方法時，我遇到了以下JVM錯誤：

*** Error in `/usr/local/bin/jdk1.8.0_65/bin/java': double free or corruption (!prev): 0x00007f3758953d80 ***

嘗試將文件從fuse-filesystem復制到本地FS時總會發生錯誤，通常是在第二次調用read方法時(對于第二個128kByte數據塊)

cp /tmp/fusetest/benchmark/benchmarkFile.large /tmp

有問題的閱讀方法是：

public int read(String path, Pointer buf, @size_t long size, @off_t long offset, FuseFileInfo fi) {

LOGGER.debug("Reading file {}, offset = {}, read length = {}", path, offset, size);

S3fsNodeInfo nodeInfo;

try {

nodeInfo = this.dbHelper.getNodeInfo(S3fsPath.fromUnixPath(path));

} catch (FileNotFoundException ex) {

LOGGER.error("Read called on non-existing node: {}", path);

return -ErrorCodes.ENOENT();

}

try {

// *** important part start

InputStream is = this.s3Helper.getInputStream(nodeInfo.getPath(), offset, size);

byte[] data = new byte[is.available()];

int numRead = is.read(data, 0, (int) size);

LOGGER.debug("Got {} bytes from stream, putting to buffer", numRead);

buf.put(offset, data, 0, numRead);

return numRead;

// *** important part end

} catch (IOException ex) {

LOGGER.error("Error while reading file {}", path, ex);

return -ErrorCodes.EIO();

}

}

使用的輸入流實際上是緩沖區上的ByteArrayInputStream，我用它來減少與S3的http通信。

我現在在單線程模式下運行保險絲，以避免任何與并發相關的問題。

有趣的是，我已經有一個沒有進行任何內部緩存的工作版本，但其他方面與此處顯示的完全相同。

不幸的是我并沒有真正進入JVM內部，所以我不確定如何找到底層 - 正常的調試沒有產生任何結果，因為實際錯誤似乎發生在C端。

這里是上述命令觸發的讀操作的完整控制臺輸出：

2016-02-29 02:08:45,652 DEBUG s3fs.fs.CacheEnabledS3fs [main] - Reading file /benchmark/benchmarkFile.large, offset = 0, read length = 131072

unique: 7, opcode: READ (15), nodeid: 3, insize: 80, pid: 8297

read[0] 131072 bytes from 0 flags: 0x8000

2016-02-29 02:08:46,024 DEBUG s3fs.fs.CachedS3Helper [main] - Getting data from cache - path = /benchmark/benchmarkFile.large, offset = 0, length = 131072

2016-02-29 02:08:46,025 DEBUG s3fs.fs.CachedS3Helper [main] - Path /benchmark/benchmarkFile.large not yet in cache, add it

2016-02-29 02:08:57,178 DEBUG s3fs.fs.CachedS3Helper [main] - Path /benchmark/benchmarkFile.large found in cache!

read[0] 131072 bytes from 0

unique: 7, success, outsize: 131088

2016-02-29 02:08:57,179 DEBUG s3fs.fs.CachedS3Helper [main] - Starting actual cache read for path /benchmark/benchmarkFile.large

2016-02-29 02:08:57,179 DEBUG s3fs.fs.CachedS3Helper [main] - Reading data from cache block 0, blockOffset = 0, length = 131072

2016-02-29 02:08:57,179 DEBUG s3fs.fs.CacheEnabledS3fs [main] - Got 131072 bytes from stream, putting to buffer

2016-02-29 02:08:57,180 DEBUG s3fs.fs.CacheEnabledS3fs [main] - Reading file /benchmark/benchmarkFile.large, offset = 131072, read length = 131072

unique: 8, opcode: READ (15), nodeid: 3, insize: 80, pid: 8297

read[0] 131072 bytes from 131072 flags: 0x8000

2016-02-29 02:08:57,570 DEBUG s3fs.fs.CachedS3Helper [main] - Getting data from cache - path = /benchmark/benchmarkFile.large, offset = 131072, length = 131072

2016-02-29 02:08:57,570 DEBUG s3fs.fs.CachedS3Helper [main] - Path /benchmark/benchmarkFile.large found in cache!

2016-02-29 02:08:57,570 DEBUG s3fs.fs.CachedS3Helper [main] - Starting actual cache read for path /benchmark/benchmarkFile.large

2016-02-29 02:08:57,571 DEBUG s3fs.fs.CachedS3Helper [main] - Reading data from cache block 0, blockOffset = 131072, length = 131072

2016-02-29 02:08:57,571 DEBUG s3fs.fs.CacheEnabledS3fs [main] - Got 131072 bytes from stream, putting to buffer

read[0] 131072 bytes from 131072

unique: 8, success, outsize: 131088

*** Error in `/usr/local/bin/jdk1.8.0_65/bin/java': double free or corruption (!prev): 0x00007fcaa8b30c80 ***

總結

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