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([2a0c:5a80:3b0e:bd00:1099:cf34:d27f:de8a]) by smtp.gmail.com with ESMTPSA id f3sm7117441wrm.96.2021.12.17.03.51.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Dec 2021 03:51:57 -0800 (PST) Message-ID: Subject: Possible nohz-full/RCU issue in arm64 KVM From: Nicolas Saenz Julienne To: Mark Rutland , maz Date: Fri, 17 Dec 2021 12:51:57 +0100 User-Agent: Evolution 3.42.2 (3.42.2-1.fc35) MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=nsaenzju@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Mailman-Approved-At: Sun, 19 Dec 2021 07:12:12 -0500 Cc: paulmck , frederic , linux-kernel , rcu , Thomas Gleixner , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu SGkgQWxsLAphcm02NCdzIGd1ZXN0IGVudHJ5IGNvZGUgZG9lcyB0aGUgZm9sbG93aW5nOgoKaW50 IGt2bV9hcmNoX3ZjcHVfaW9jdGxfcnVuKHN0cnVjdCBrdm1fdmNwdSAqdmNwdSkKewoJWy4uLl0K CglndWVzdF9lbnRlcl9pcnFvZmYoKTsKCglyZXQgPSBrdm1fY2FsbF9oeXBfcmV0KF9fa3ZtX3Zj cHVfcnVuLCB2Y3B1KTsKCglbLi4uXQoKCWxvY2FsX2lycV9lbmFibGUoKTsKCgkvKgoJICogV2Ug ZG8gbG9jYWxfaXJxX2VuYWJsZSgpIGJlZm9yZSBjYWxsaW5nIGd1ZXN0X2V4aXQoKSBzbwoJICog dGhhdCBpZiBhIHRpbWVyIGludGVycnVwdCBoaXRzIHdoaWxlIHJ1bm5pbmcgdGhlIGd1ZXN0IHdl CgkgKiBhY2NvdW50IHRoYXQgdGljayBhcyBiZWluZyBzcGVudCBpbiB0aGUgZ3Vlc3QuICBXZSBl bmFibGUKCSAqIHByZWVtcHRpb24gYWZ0ZXIgY2FsbGluZyBndWVzdF9leGl0KCkgc28gdGhhdCBp ZiB3ZSBnZXQKCSAqIHByZWVtcHRlZCB3ZSBtYWtlIHN1cmUgdGlja3MgYWZ0ZXIgdGhhdCBpcyBu b3QgY291bnRlZCBhcwoJICogZ3Vlc3QgdGltZS4KCSAqLwoJZ3Vlc3RfZXhpdCgpOwoJWy4uLl0K fQoKCk9uIGEgbm9oei1mdWxsIENQVSwgZ3Vlc3Rfe2VudGVyLGV4aXR9KCkgZGVsaW1pdCBhbiBS Q1UgZXh0ZW5kZWQgcXVpZXNjZW50CnN0YXRlIChFUVMpLiBBbnkgaW50ZXJydXB0IGhhcHBlbmlu ZyBiZXR3ZWVuIGxvY2FsX2lycV9lbmFibGUoKSBhbmQKZ3Vlc3RfZXhpdCgpIHNob3VsZCBkaXNh YmxlIHRoYXQgRVFTLiBOb3csIEFGQUlDVCBhbGwgZWwwIGludGVycnVwdCBoYW5kbGVycyBkbwp0 aGUgcmlnaHQgdGhpbmcgaWYgdHJnZ2VyZWQgaW4gdGhpcyBjb250ZXh0LCBidXQgZWwxJ3Mgd29u J3QuIElzIGl0IHBvc3NpYmxlIHRvCmhpdCBhbiBlbDEgaGFuZGxlciAoZm9yIGV4YW1wbGUgX19l bDFfaXJxKCkpIHRoZXJlPwoKVGhhbmtzLAoKLS0gCk5pY29sw6FzIFPDoWVuegoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18Ka3ZtYXJtIG1haWxpbmcgbGlz dAprdm1hcm1AbGlzdHMuY3MuY29sdW1iaWEuZWR1Cmh0dHBzOi8vbGlzdHMuY3MuY29sdW1iaWEu ZWR1L21haWxtYW4vbGlzdGluZm8va3ZtYXJtCg==