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[VPNKit] panic: tap2vif: read: read /dev/net/tun: not pollable #130

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AkihiroSuda opened this issue Mar 16, 2020 · 5 comments · Fixed by #263
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[VPNKit] panic: tap2vif: read: read /dev/net/tun: not pollable #130

AkihiroSuda opened this issue Mar 16, 2020 · 5 comments · Fixed by #263
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bug Something isn't working priority/low

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@AkihiroSuda
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AkihiroSuda commented Mar 16, 2020 •
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panic: tap2vif: read: read /dev/net/tun: not pollable

goroutine 19 [running]:
github.com/rootless-containers/rootlesskit/pkg/network/vpnkit.tap2vif(0xc0001700a0, 0x7eff64137198, 0xc00000c200)
        /tmp/tmp.wZbjFCTJTg/src/github.com/rootless-containers/rootlesskit/pkg/network/vpnkit/vpnkit.go:195 +0x16f
created by github.com/rootless-containers/rootlesskit/pkg/network/vpnkit.startVPNKitRoutines
        /tmp/tmp.wZbjFCTJTg/src/github.com/rootless-containers/rootlesskit/pkg/network/vpnkit/vpnkit.go:185 +0x516

RootlessKit v0.9.2, dockerd-rootless.sh on moby/moby@37defbf .
Happened during early startup phase.
@AkihiroSuda AkihiroSuda added the bug Something isn't working label Mar 16, 2020
@iHiD
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iHiD commented Jul 13, 2021

I also just hit the same issue. @AkihiroSuda Did you find a solution?

@AkihiroSuda
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This seems a solution, but haven't tested

golang/go#38618 (comment)

... using unix.Open instead of os.OpenFile and setting the fd to NonBlocking seems to solve the problem, ...

@AkihiroSuda
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A workaround is to use slirp4netns
/~https://github.com/rootless-containers/slirp4netns

Rootless Docker automatically switches from VPNKit to slirp4netns if slirp4netns (v0.4.0 or later) is installed.

@iHiD
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iHiD commented Jul 13, 2021

OK, great. Thanks. I'll try slirp4netns later.

@iHiD iHiD mentioned this issue Jul 13, 2021
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AkihiroSuda added a commit to AkihiroSuda/rootlesskit that referenced this issue Aug 3, 2021
@AkihiroSuda
vpnkit: switch away from jamescun/tuntap to songgao/water
99b680c 
Fix rootless-containers#130 `panic: tap2vif: read: read /dev/net/tun: not pollable`

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
@AkihiroSuda AkihiroSuda mentioned this issue Aug 3, 2021
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@AkihiroSuda
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Should be fixed in RootlessKit v0.14.3

youmeim pushed a commit to youmeim/rootlesskit that referenced this issue Dec 20, 2024
@AkihiroSuda @youmeim
vpnkit: switch away from jamescun/tuntap to songgao/water
7a31ab1 
Fix rootless-containers#130 `panic: tap2vif: read: read /dev/net/tun: not pollable`

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
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