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nsexec: retry unshare on EINVAL #3772

Merged
merged 1 commit into from
Mar 17, 2023

Commits on Mar 16, 2023

  1. nsexec: retry unshare on EINVAL

    Older kernels may return EINVAL on unshare when a process is reading
    runc's /proc/$PID/status or /proc/$PID/maps. This was fixed by kernel
    commit 12c641ab8270f ("unshare: Unsharing a thread does not require
    unsharing a vm") in Linuxt  v4.3.
    
    For CentOS 7, the fix was backported to CentOS 7.7 (kernel 3.10.0-1062).
    
    To work around this kernel bug, let's retry on EINVAL a few times.
    
    Reported-by: zzyyzte <zhang.yu58@zte.com.cn>
    Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
    kolyshkin committed Mar 16, 2023
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