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syscall: installing Go in chroot chronically fails on TestCloneNEWUSERAndRemapRootDisableSetgroups if /proc/sys/kernel/unprivilged_userns_clone is not 1 #34178
I'm installing the latest go in a chroot, and I'm getting a repeat of the error in #11261, but this time, the patch mentioned in #11261 (http://golang.org/cl/11269) doesn't stop the bug. I manually set that kernel variable (/proc/sys/kernel/unprivileged_userns_clone) to 0 rather than 1, and then the test succeeded, so that is a workaround, but the error still happened in the first place.
This workaround allowed Go to be installed successfully.
I am not going to repeat the data in #11261 since that already explained the background.