[Bug 1841058] Re: kernel version 4.4.0-1090-aws docker file system issue

[Orlix]

Update on kernel 1096 and the issue still persist
in our container we run as non-root user 
after sed-ing the file persmission are still rw for the user but the nginx cannot read the file
after chmod u+rw file with same user the file is readable again... 

E.g.
docker run --rm -ti --entrypoint=bash  -u nginx nginx
nginx at 5d5453275231:/$ cd /tmp/
nginx at 5d5453275231:/tmp$ echo aaa > test
nginx at 5d5453275231:/tmp$ cat test
aaa
nginx at 5d5453275231:/tmp$ sed -i 's/a/Q/g' test
nginx at 5d5453275231:/tmp$ cat test
cat: test: Permission denied
nginx at 5d5453275231:/tmp$ chmod u+rw test
nginx at 5d5453275231:/tmp$ cat test
QQQ
nginx at 5d5453275231:/tmp$

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https://bugs.launchpad.net/bugs/1841058

Title:
  kernel version 4.4.0-1090-aws docker file system issue

Status in linux-aws package in Ubuntu:
  New
Status in sed package in Ubuntu:
  New

Bug description:
  When using kernel version 4.4.0-1090-aws 
  if you have running container and you do sed on some files then you cannot access them inside the container any more

  we use the nginx image and we can reproduce it everytime

  in the container we have chown and then sed commands on some nginx.conf files 
  after the sed we are getting persmission denied inside the container even that we use root.

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