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The downloaders.Close() call acquires the downloaders' mutex before calling the wait group wait and the main downloaders thread has a periodical (5 seconds interval) call to kick its waiters and the waiter dispatch function tries to get the mutex. So a deadlock can occur if the Close() call starts, gets the mutex, while the main downloader thread already got the timer's tick and proceeded to call kickWaiters. The deadlock happens when the Close call gets the mutex between the timer's kick and the main downloader thread gets the mutex first. So it's a pretty short period of time and it probably explains why the problem has not surfaced, maybe something like tens of nanoseconds out of 5 seconds (~10^^-8). It took 5 days of continued stressing the Close calls for the deadlock to appear.
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Rclone
Rclone ("rsync for cloud storage") is a command line program to sync files and directories to and from different cloud storage providers.
Storage providers
- 1Fichier 📄
- Alibaba Cloud (Aliyun) Object Storage System (OSS) 📄
- Amazon Drive 📄 (See note)
- Amazon S3 📄
- Backblaze B2 📄
- Box 📄
- Ceph 📄
- Citrix ShareFile 📄
- DigitalOcean Spaces 📄
- Dreamhost 📄
- Dropbox 📄
- FTP 📄
- GetSky 📄
- Google Cloud Storage 📄
- Google Drive 📄
- Google Photos 📄
- HTTP 📄
- Hubic 📄
- Jottacloud 📄
- IBM COS S3 📄
- Koofr 📄
- Mail.ru Cloud 📄
- Memset Memstore 📄
- Mega 📄
- Memory 📄
- Microsoft Azure Blob Storage 📄
- Microsoft OneDrive 📄
- Minio 📄
- Nextcloud 📄
- OVH 📄
- OpenDrive 📄
- OpenStack Swift 📄
- Oracle Cloud Storage 📄
- ownCloud 📄
- pCloud 📄
- premiumize.me 📄
- put.io 📄
- QingStor 📄
- Rackspace Cloud Files 📄
- Scaleway 📄
- Seafile 📄
- SFTP 📄
- StackPath 📄
- SugarSync 📄
- Tardigrade 📄
- Tencent Cloud Object Storage (COS) 📄
- Wasabi 📄
- WebDAV 📄
- Yandex Disk 📄
- The local filesystem 📄
Please see the full list of all storage providers and their features
Features
- MD5/SHA-1 hashes checked at all times for file integrity
- Timestamps preserved on files
- Partial syncs supported on a whole file basis
- Copy mode to just copy new/changed files
- Sync (one way) mode to make a directory identical
- Check mode to check for file hash equality
- Can sync to and from network, e.g. two different cloud accounts
- Optional large file chunking (Chunker)
- Optional encryption (Crypt)
- Optional cache (Cache)
- Optional FUSE mount (rclone mount)
- Multi-threaded downloads to local disk
- Can serve local or remote files over HTTP/WebDav/FTP/SFTP/dlna
Installation & documentation
Please see the rclone website for:
Downloads
License
This is free software under the terms of MIT the license (check the COPYING file included in this package).