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([2a0c:5a80:1e09:d600:637e:7f1b:a4a0:fc92]) by smtp.gmail.com with ESMTPSA id u3sm11320283wrs.0.2022.01.11.03.32.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Jan 2022 03:32:39 -0800 (PST) Message-ID: <399d8805ca09f7d3c905b8c653abf60dd7141574.camel@redhat.com> Subject: Re: Possible nohz-full/RCU issue in arm64 KVM From: Nicolas Saenz Julienne To: Mark Rutland , Paolo Bonzini Cc: paulmck , maz , frederic , linux-kernel , rcu , Thomas Gleixner , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel , Anup Patel Date: Tue, 11 Jan 2022 12:32:38 +0100 In-Reply-To: References: <70f112072d9496d21901946ea82832d3ed3a8cb2.camel@redhat.com> <9ab8107f-ff41-6a9e-57e1-a261bea93aca@redhat.com> 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220111_033246_634854_0E5CDFBB X-CRM114-Status: GOOD ( 20.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgTWFyaywKCk9uIFR1ZSwgMjAyMi0wMS0wNCBhdCAxNjozOSArMDAwMCwgTWFyayBSdXRsYW5k IHdyb3RlOgo+IE9uIEZyaSwgRGVjIDE3LCAyMDIxIGF0IDA0OjU0OjIyUE0gKzAxMDAsIFBhb2xv IEJvbnppbmkgd3JvdGU6Cj4gPiBPbiAxMi8xNy8yMSAxNTozOCwgTWFyayBSdXRsYW5kIHdyb3Rl Ogo+ID4gPiBGb3IgZXhhbXBsZSBrdm1fZ3Vlc3RfZW50ZXJfaXJxb2ZmKCkgY2FsbHMgZ3Vlc3Rf ZW50ZXJfaXJxX29mZigpIHdoaWNoIGNhbGxzCj4gPiA+IHZ0aW1lX2FjY291bnRfZ3Vlc3RfZW50 ZXIoKSwgYnV0IGt2bV9ndWVzdF9leGl0X2lycW9mZigpIGRvZXNuJ3QgY2FsbAo+ID4gPiBndWVz dF9leGl0X2lycV9vZmYoKSBhbmQgdGhlIGNhbGwgdG8gdnRpbWVfYWNjb3VudF9ndWVzdF9leGl0 KCkgaXMgb3Blbi1jb2RlZAo+ID4gPiBlbHNld2hlcmUuIEFsc28sIGd1ZXN0X2VudGVyX2lycV9v ZmYoKSBjb25kaXRpb25hbGx5IGNhbGxzCj4gPiA+IHJjdV92aXJ0X25vdGVfY29udGV4dF9zd2l0 Y2goKSwgYnV0IEkgY2FuJ3QgaW1tZWRpYXRlbHkgc3BvdCBhbnl0aGluZyBvbiB0aGUKPiA+ID4g ZXhpdCBzaWRlIHRoYXQgY29ycmVzcG9uZGVkIHdpdGggdGhhdCwgd2hpY2ggbG9va3Mgc3VzcGlj aW91cy4KPiA+IAo+ID4gcmN1X25vdGVfY29udGV4dF9zd2l0Y2goKSBpcyBhIHBvaW50LWluLXRp bWUgbm90aWZpY2F0aW9uOyBpdCdzIG5vdCBzdHJpY3RseQo+ID4gbmVjZXNzYXJ5LCBidXQgaXQg bWF5IGltcHJvdmUgcGVyZm9ybWFuY2UgYSBiaXQgYnkgYXZvaWRpbmcgdW5uZWNlc3NhcnkgSVBJ cwo+ID4gZnJvbSB0aGUgUkNVIHN1YnN5c3RlbS4KPiA+IAo+ID4gVGhlcmUncyBubyBiZW5lZml0 IGZyb20gZG9pbmcgaXQgd2hlbiB5b3UncmUgYmFjayBmcm9tIHRoZSBndWVzdCwgYmVjYXVzZSBh dAo+ID4gdGhhdCBwb2ludCB0aGUgQ1BVIGlzIGp1c3QgcnVubmluZyBub3JtYWwga2VybmVsIGNv ZGUuCj4gCj4gSSBzZWUuCj4gCj4gTXkgbWFpbiBpc3N1ZSBoZXJlIHdhcyBqdXN0IHRoYXQgaXQn cyByZWFsbHkgZGlmZmljdWx0IHRvIHNlZSBob3cgdGhlCj4gZW50cnkvZXhpdCBsb2dpYyBpcyBi YWxhbmNlZCwgYW5kIEkgcmVja29uIHdlIGNhbiBzb2x2ZSB0aGF0IGJ5IHNwbGl0dGluZwo+IGd1 ZXN0X3tlbnRlcixleGl0fV9pcnFvZmYoKSBpbnRvIGhlbHBlciBmdW5jdGlvbnMgdG8gaGFuZGxl IHRoZSB2dGltZQo+IGFjY291bnRpbmcgc2VwYXJhdGVseSBmcm9tIHRoZSBjb250ZXh0IHRyYWNr aW5nLCBzbyB0aGF0IGFyY2ggY29kZSBjYW4gZG8KPiBzb21ldGhpbmcgbGlrZToKPiAKPiAgIGd1 ZXN0X3RpbWluZ19lbnRlcl9pcnFvZmYoKTsKPiAgIAo+ICAgZ3Vlc3RfZXFzX2VudGVyX2lycW9m ZigpOwo+ICAgPCBhY3R1YWxseSBydW4gdkNQVSBoZXJlID4KPiAgIGd1ZXN0X2Vxc19leGl0X2ly cW9mZigpOwo+ICAgCj4gICA8IGhhbmRsZSBwZW5kaW5nIElSUXMgaGVyZSA+Cj4gICAKPiAgIGd1 ZXN0X3RpbWluZ19leGl0X2lycW9mZigpOwo+IAo+IC4uLiB3aGljaCBJIGhvcGUgc2hvdWxkIHdv cmsgZm9yIFJJU0MtViB0b28uCj4gCj4gSSd2ZSBoYWQgYSBnbywgYW5kIEkndmUgcHVzaGVkIG91 dCBhIFdJUCB0bzoKPiAKPiAgIGh0dHBzOi8vZ2l0Lmtlcm5lbC5vcmcvcHViL3NjbS9saW51eC9r ZXJuZWwvZ2l0L21hcmsvbGludXguZ2l0L2xvZy8/aD1hcm02NC9rdm0vcmN1CgpIYWQgYSBsb29r IGF0IHRoZSBwYXRjaGVzIGFuZCB0aGV5IHNlZWVtIE9LIHRvIG1lLgoKVGhhbmtzIQoKLS0gCk5p Y29sw6FzIFPDoWVuegoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlz dHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3Rp bmZvL2xpbnV4LWFybS1rZXJuZWwK