Hello, The folowing sycall is failing when called on a Travis-CI build machine.
clone(.., CLONE_FILES | CLONE_IO | CLONE_SIGHAND | CLONE_VM | CLONE_SYSVSEM | CLONE_NEWNET | CLONE_NEWUTS | CLONE_NEWUSER, .. ); This works when I run it on my machine, but inside the Docker container that Travis creates it fails with EPERM. Can anyone suggest why this might be happening? The clone(2) manpage lists possible reasons: EPERM CLONE_NEWCGROUP, CLONE_NEWIPC, CLONE_NEWNET, CLONE_NEWNS, CLONE_NEWPID, or CLONE_NEWUTS was specified by an unprivileged process (process without CAP_SYS_ADMIN). This shouldn't apply since I'm using CLONE_NEWUSER EPERM CLONE_PID was specified by a process other than process 0. (This error occurs only on Linux 2.5.15 and earlier.) Doesn't apply. EPERM CLONE_NEWUSER was specified in flags, but either the effective user ID or the effective group ID of the caller does not have a mapping in the parent namespace (see user_namespaces(7)). Again, this shouldn't apply. The process creating the namespace has a valid (not-nobody) uid and gid. EPERM (since Linux 3.9) CLONE_NEWUSER was specified in flags and the caller is in a chroot environment (i.e., the caller's root directory does not match the root directory of the mount namespace in which it resides). Possibly this one? The docker container shouldn't be aware that it's running in a chroot though. Calling mount inside the container lists: overlay on / type overlay (rw,relatime,...) Which indicates that it's living inside its own mount namespace with its own root directory. So I'm confused. Does anyone have any suggestions for why else this might be failing or thngs I could try to debug it? Is there a way to get more than just an eror code out of linux? Are there reasons for giving that error code that aren't listed in the man page? Any help would be greatly appreciated. - Andrew
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