Update:

Just checked the final state of my test setup with the NFS share hosting 
the s3ql... and my connections hang, load of server is 10+.

Some info:
[root@strobiserver .s3ql]# s3qlstat /mnt/s3ql-ttt-local/
Directory entries:    6495
Inodes:               6497
Data blocks:          7954
Total data size:      71169.19 MiB
After de-duplication: 63789.25 MiB (89.63% of total)
After compression:    63310.29 MiB (88.96% of total, 99.25% of 
de-duplicated)
Database size:        2.10 MiB (uncompressed)
(some values do not take into account not-yet-uploaded dirty blocks in 
cache)

df -f "hangs" at prompt (ctrl-C) does work

[root@strobiserver .s3ql]# cat /etc/mtab
rootfs / rootfs rw 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
devtmpfs /dev devtmpfs rw,nosuid,size=1544224k,nr_inodes=212798,mode=755 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 
0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
devpts /dev/pts devpts 
rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0
tmpfs /sys/fs/cgroup tmpfs rw,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup 
rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd
 
0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 
0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup 
rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 
0 0
cgroup /sys/fs/cgroup/devices cgroup 
rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup 
rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/net_cls,net_prio cgroup 
rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/perf_event cgroup 
rw,nosuid,nodev,noexec,relatime,perf_event 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
/dev/mapper/vg_strobiserver-lv_root / ext4 rw,relatime,data=ordered 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs 
rw,relatime,fd=34,pgrp=1,timeout=300,minproto=5,maxproto=5,direct 0 0
tmpfs /tmp tmpfs rw 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
sunrpc /proc/fs/nfsd nfsd rw,relatime 0 0
/dev/sda1 /boot ext4 rw,relatime,data=ordered 0 0
/dev/mapper/vg_strobiserver-lv_home /home ext4 
rw,relatime,quota,usrquota,data=ordered 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
192.168.1.195:/nfs/strobiserver /mnt/local-nfs nfs 
rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.195,mountvers=3,mountport=45764,mountproto=udp,local_lock=none,addr=192.168.1.195
 
0 0
local:///mnt/local-nfs/myfsdata-ttt /mnt/s3ql-ttt-local fuse.s3ql 
rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other 
0 0

No info in ~/.s3ql/mount.log.

ls -alR /mnt/s3ql-ttt-local does show the content, but files cannot be 
opened (hangs)

ls -alR /mnt/local-nfs hangs too.

NFS server has increased cpu activity:
top - 22:40:08 up  9:53,  1 user,  load average: 5.18, 5.02, 4.71
Tasks:  85 total,   3 running,  82 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.2 us, 53.1 sy,  0.0 ni, 46.7 id,  0.0 wa,  0.0 hi,  0.0 si,  
0.0 st
KiB Mem:    232448 total,   164032 used,    68416 free,     5824 buffers
KiB Swap:   500672 total,    97088 used,   403584 free,    45184 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
 6745 root      20   0     0    0    0 R  42.3  0.0  10:10.57 nfsd
 6743 root      20   0     0    0    0 R  40.6  0.0   8:59.98 nfsd
 6748 root      20   0     0    0    0 S  14.9  0.0   9:44.72 nfsd
 6744 root      20   0     0    0    0 S  10.2  0.0  10:49.00 nfsd

*Bottom-line:* Google learns me that my nfs mount is crashed, I found 
articles from 2012, caused by lack of (cpu) hardware - don't think that is 
the root cause here.

I'll let the server "hang" like this during the night, if someone has an 
idea for debugging/logging, I'll follow-up tomorrow.

Thank you.

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