The s3fs process exits unexpectedly on windows
Author: fangqiananCreated Apr 20, 2026Updated Apr 20, 2026
Additional Information
Version of s3fs being used (s3fs --version)
1.95
Version of fuse being used (pkg-config --modversion fuse, rpm -qi fuse or dpkg -s fuse)
winfsp
Provider (AWS, OVH, Hetzner, iDrive E2, ...)
OSS
How to run s3fs, if applicable
./s3fs.exe xxx z: -ourl='http://oss-cn-shanghai-internal.aliyuncs.com' -opasswd_file=/c/.passwd-ossfs -o sigv4 -o region=cn-shanghai -odbglevel=dbg -ologfile=/c/s3fs.log -o allow_other -o umask=000
s3fs syslog messages (grep s3fs /var/log/syslog, journalctl | grep s3fs, or s3fs outputs)
The last several lines of the log before the process exits.
2026-04-20T11:40:16.623Z [DBG] curl_handlerpool.cpp:GetHandler(64): Get handler from pool: rest = 14
2026-04-20T11:40:16.624Z [DBG] curl_handlerpool.cpp:GetHandler(64): Get handler from pool: rest = 13
2026-04-20T11:40:16.624Z [DBG] curl.cpp:RequestPerform(2553): connecting to URL http://fc-ossfs.oss-cn-shanghai-internal.aliyuncs.com/concurrent-randread.7.0
2026-04-20T11:40:16.624Z [INF] curl.cpp:insertV4Headers(2975): computing signature [HEAD] [/concurrent-randread.7.0] [] []
2026-04-20T11:40:16.624Z [DBG] curl.cpp:RequestPerform(2553): connecting to URL http://fc-ossfs.oss-cn-shanghai-internal.aliyuncs.com/concurrent-randwrite.5.0
2026-04-20T11:40:16.624Z [INF] curl_util.cpp:url_to_host(266): url is http://oss-cn-shanghai-internal.aliyuncs.com
2026-04-20T11:40:16.624Z [DBG] curl_handlerpool.cpp:GetHandler(64): Get handler from pool: rest = 12
2026-04-20T11:40:16.624Z [INF] curl.cpp:insertV4Headers(2975): computing signature [HEAD] [/concurrent-randwrite.5.0] [] []
2026-04-20T11:40:16.624Z [INF] curl_util.cpp:url_to_host(266): url is http://oss-cn-shanghai-internal.aliyuncs.com
2026-04-20T11:40:16.624Z [DBG] curl.cpp:RequestPerform(2553): connecting to URL http://fc-ossfs.oss-cn-shanghai-internal.aliyuncs.com/concurrent-write.0.0
2026-04-20T11:40:16.624Z [INF] curl.cpp:insertV4Headers(2975): computing signature [HEAD] [/concurrent-write.0.0] [] []
2026-04-20T11:40:16.624Z [INF] curl_util.cpp:url_to_host(266): url is http://oss-cn-shanghai-internal.aliyuncs.com
2026-04-20T11:40:16.629Z [INF] curl.cpp:RequestPerform(2591): HTTP response code 200
2026-04-20T11:40:16.629Z [DBG] curl_handlerpool.cpp:ReturnHandler(84): Return handler to poolDetails about issue
I compiled s3fs-fuse (1.95) on a windows server using msys2. After I mounted a bucket using s3fs.exe as above, I double clicked the disk (Z:\ as I specified), and then it went wrong, and the s3fs.exe process exited.
Source: s3fs-fuse/s3fs-fuse