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Thu, 16 Jul 2026 14:31:50 -0700 (PDT) Received: from [10.138.10.6] ([185.98.168.14]) by smtp.gmail.com with ESMTPSA id 00721157ae682-81e6c199c5asm205438227b3.32.2026.07.16.14.31.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Jul 2026 14:31:49 -0700 (PDT) Message-ID: Date: Thu, 16 Jul 2026 17:31:45 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Networking test runs run-vmm twice with the same VM ID From: Demi Marie Obenour To: Alyssa Ross References: <87h5lze3s1.fsf@alyssa.is> <117eba13-ffa5-4675-9097-b466fd5d7d16@gmail.com> Content-Language: en-US Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <117eba13-ffa5-4675-9097-b466fd5d7d16@gmail.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------YI9B28qkzEdnZ0tXy4Gu04Tm" Message-ID-Hash: 77BAFMIXWKU5V7L4H3ITX3CKQH7AE62S X-Message-ID-Hash: 77BAFMIXWKU5V7L4H3ITX3CKQH7AE62S X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Hits: member-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; emergency CC: Spectrum OS Development X-Mailman-Version: 3.3.10 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------YI9B28qkzEdnZ0tXy4Gu04Tm Content-Type: multipart/mixed; boundary="------------6GKOWDMOTi6a9PflyEAraT66"; protected-headers="v1"; hp="clear" Message-ID: Date: Thu, 16 Jul 2026 17:31:45 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Networking test runs run-vmm twice with the same VM ID From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development References: <87h5lze3s1.fsf@alyssa.is> <117eba13-ffa5-4675-9097-b466fd5d7d16@gmail.com> Content-Language: en-US Autocrypt: addr=demiobenour@gmail.com; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 7/16/26 16:14, Demi Marie Obenour wrote: > On 7/16/26 04:29, Alyssa Ross wrote: >> Demi Marie Obenour writes: >> >>> The networking test runs run-vmm twice with the same VM ID. >>> If it waits for the previous cgroup to be empty, the second >>> call waits forever. >>> >>> Is this expected? I would expect that run-vmm is only called >>> once. >> >> Assuming you mean run twice in sequence, rather than run twice at the >> same time, then yes, it is expected. >> >> The way it works at the moment is that imported VMs have a VM ID >> assigned when they're imported, and they can then be started any numbe= r >> of times. When the VM shuts down, the VMM exits, so if the VM is >> started again after that, run-vmm will be run again with the same VM I= D. >> If this were not the case, VM IDs could not be assigned at import time= , >> and stay the same between successive boots of the same VM. >> >> If your cgroup is not being emptied as expected, that is a bug, >> regardless of whether it ends up being used again, because there >> shouldn't be lingering processes or cgroups hanging around forever. >> It sounds like we should have a test that confirms that this doesn't >> happen, if it's hard to get right. >> >> The networking test does do something slightly unusual, which is that = it >> restarts the VMM with s6-svc -Wr -r, rather than e.g. via the Cloud >> Hypervisor API. I would expect that this runs the finish script, but >> might be worth confirming. >=20 > It does indeed run the finish script! >=20 > It appears there are likely two or more bugs. The first is that > sending a signal to the run-vmm process itself is insufficient: > it leaves child processes behind. I don't know why that is. Is it > something you could figure out? >=20 > The second bug was that the finish script purged the wrong cgroup. > It tried to purge /vmm, which doesn't exist. Purging a nonexistent > cgroup is a (intentionally) a no-op, so the finish script failed to > do anything. >=20 > Because of these two problems, there were still processes left in the > cgroup when run-vmm ran again. Therefore, cgroup-setup was waiting > for them to exit, which never happened. >=20 > I haven't fixed the first problem, but I did fix the second. However, > this caused /run/vsock/${1}/vsock to be left behind. I suspect this > is because cgroup-setup sends SIGKILL, so Cloud Hypervisor never gets > to unlink the socket. This caused Cloud Hypervisor to fail to restart.= >=20 > To solve *that* problem, I had to add `rm -f /run/vsock/${1}/vsock` > to run-vmm. Fortunately, this is safe against symlink attacks: the > VMM has no write access to /run/vsock/${1}, so it can't turn that > into a symlink, and rm doesn't follow symlinks in the file it is told > to delete. >=20 > Once I added the rm call, the tests passed! It kept passing even after I removed the second --no-wait from run-vmm, which was the workaround for the bug. I should have done that before. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------6GKOWDMOTi6a9PflyEAraT66-- --------------YI9B28qkzEdnZ0tXy4Gu04Tm Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmpZTcEACgkQszaHOrMp 8lO9DRAAnzBtsmdJSPulg0ktg+vY8Iqjv57mylIQXRVtkg2MlpIocCTcp7I18aro U98ySOgr7xqD1M0RGLUjEvIjbKyTZFVH47kgg6fv8JIi7Ki5zM0EF61HQHyaIsUz 5TKRdRQJy9gRy2X3GJD0KZbcrFKDyp3F9MpretZcbhC0YnyspHVB4VmCvTb0SuZ+ cU55AZ59q5qwx1m+Yi2l6orIB6Zf+vgX3pEr7rvjzH7YptqoElDj2XrqRs4rWwNU U4Bo8torHfWjBrLJbBHX8t/XFZpf+U4xtJGyXl4h9qFwKdBG3eKLeeyiotGPoJw7 iEaBxaqovZfiDSF39Zqqqi9dlPsnb062IfuD3uup/gv4gms8qi/VGjO+Qmja3WM2 SUwHcMjwIHhyhLFtz3b7G4uHT4OWhVSBRasn8EV5MKJENIE+bueocBAxHy+QUosP SVfvFYzebHYlNjwKUaxWR0/3amezihl4PFU0d48zwXYAhUJRqol2i6I6PbwlPD0c 1Lq5x8I1vnuGz7EOpKf/97c9NYQyEMbrb/3jbhy/pYTlW5Atl/H7VR3HOdnv1k4r 8RPfuL8IWqXaP7j97ydo9nA1xlnI02pibygI18YeafTjupi4JFMr/PNAeQI1T1+M LLvYrTqjOy5wn40gAZJQYPr1uXrM357jTQLedS5NbYoryb0k15A= =Qn3f -----END PGP SIGNATURE----- --------------YI9B28qkzEdnZ0tXy4Gu04Tm--