nsexec: retry unshare on EINVAL #3772
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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>
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AkihiroSuda
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Could you add these lines to the comment lines in the code? |
I had it in there but later decided to be more concise in the code and move all the details into the commit message. |
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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 Linux 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.
Not adding a test case as the fix is short and obvious, and the repro is somewhat complicated (see #3705).
Closes: #3705