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([2a0c:5a80:3511:9200:f938:102b:34c2:d5db]) by smtp.gmail.com with ESMTPSA id b10sm8204839wrg.19.2021.12.17.08.20.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Dec 2021 08:20:21 -0800 (PST) Message-ID: <27231550b5600072da918aa41c07404dea13590e.camel@redhat.com> Subject: Re: Possible nohz-full/RCU issue in arm64 KVM From: Nicolas Saenz Julienne To: paulmck@kernel.org, Paolo Bonzini Cc: Mark Rutland , maz , frederic , linux-kernel , rcu , Thomas Gleixner , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel Date: Fri, 17 Dec 2021 17:20:21 +0100 In-Reply-To: <20211217160749.GS641268@paulmck-ThinkPad-P17-Gen-1> References: <70f112072d9496d21901946ea82832d3ed3a8cb2.camel@redhat.com> <9ab8107f-ff41-6a9e-57e1-a261bea93aca@redhat.com> <20211217160749.GS641268@paulmck-ThinkPad-P17-Gen-1> 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-20211217_082027_459833_8F6966C6 X-CRM114-Status: GOOD ( 17.98 ) 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 SGkgUGF1bCwKCk9uIEZyaSwgMjAyMS0xMi0xNyBhdCAwODowNyAtMDgwMCwgUGF1bCBFLiBNY0tl bm5leSB3cm90ZToKPiBPbiBGcmksIERlYyAxNywgMjAyMSBhdCAwNDo1NDoyMlBNICswMTAwLCBQ YW9sbyBCb256aW5pIHdyb3RlOgo+ID4gT24gMTIvMTcvMjEgMTU6MzgsIE1hcmsgUnV0bGFuZCB3 cm90ZToKPiA+ID4gRm9yIGV4YW1wbGUga3ZtX2d1ZXN0X2VudGVyX2lycW9mZigpIGNhbGxzIGd1 ZXN0X2VudGVyX2lycV9vZmYoKSB3aGljaCBjYWxscwo+ID4gPiB2dGltZV9hY2NvdW50X2d1ZXN0 X2VudGVyKCksIGJ1dCBrdm1fZ3Vlc3RfZXhpdF9pcnFvZmYoKSBkb2Vzbid0IGNhbGwKPiA+ID4g Z3Vlc3RfZXhpdF9pcnFfb2ZmKCkgYW5kIHRoZSBjYWxsIHRvIHZ0aW1lX2FjY291bnRfZ3Vlc3Rf ZXhpdCgpIGlzIG9wZW4tY29kZWQKPiA+ID4gZWxzZXdoZXJlLiBBbHNvLCBndWVzdF9lbnRlcl9p cnFfb2ZmKCkgY29uZGl0aW9uYWxseSBjYWxscwo+ID4gPiByY3VfdmlydF9ub3RlX2NvbnRleHRf c3dpdGNoKCksIGJ1dCBJIGNhbid0IGltbWVkaWF0ZWx5IHNwb3QgYW55dGhpbmcgb24gdGhlCj4g PiA+IGV4aXQgc2lkZSB0aGF0IGNvcnJlc3BvbmRlZCB3aXRoIHRoYXQsIHdoaWNoIGxvb2tzIHN1 c3BpY2lvdXMuCj4gPiAKPiA+IHJjdV9ub3RlX2NvbnRleHRfc3dpdGNoKCkgaXMgYSBwb2ludC1p bi10aW1lIG5vdGlmaWNhdGlvbjsgaXQncyBub3Qgc3RyaWN0bHkKPiA+IG5lY2Vzc2FyeSwgYnV0 IGl0IG1heSBpbXByb3ZlIHBlcmZvcm1hbmNlIGEgYml0IGJ5IGF2b2lkaW5nIHVubmVjZXNzYXJ5 IElQSXMKPiA+IGZyb20gdGhlIFJDVSBzdWJzeXN0ZW0uCj4gPiAKPiA+IFRoZXJlJ3Mgbm8gYmVu ZWZpdCBmcm9tIGRvaW5nIGl0IHdoZW4geW91J3JlIGJhY2sgZnJvbSB0aGUgZ3Vlc3QsIGJlY2F1 c2UgYXQKPiA+IHRoYXQgcG9pbnQgdGhlIENQVSBpcyBqdXN0IHJ1bm5pbmcgbm9ybWFsIGtlcm5l bCBjb2RlLgo+IAo+IERvIHNjaGVkdWxpbmctY2xvY2sgaW50ZXJydXB0cyBmcm9tIGd1ZXN0IG1v ZGUgaGF2ZSB0aGUgInVzZXIiIHBhcmFtZXRlcgo+IHNldD8gIElmIHNvLCB0aGF0IHdvdWxkIGtl ZXAgUkNVIGhhcHB5LgoKQXJlIHlvdSByZWZlcnJpbmcgdG8gdGhlIHVzZXJfbW9kZSgpIGNoZWNr IGluIGlycWVudHJ5X2VudGVyKCk/IElmIHNvIEkgZG9uJ3QKdGhpbmsgaXQnbGwgaGVscCwgYXJt NjQgZG9lc24ndCB1c2UgdGhhdCBmdW5jdGlvbi4gSXQgZGlyZWN0bHkgY2FsbHMKZW50ZXJfZnJv bV97dXNlcixrZXJuZWx9X21vZGUoKSB0aHJvdWdoIGl0cyBjdXN0b20gZW50cnkvZXhpdCByb3V0 aW5lcy4KClJlZ2FyZHMsCgotLSAKTmljb2zDoXMgU8OhZW56CgoKX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxp c3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZy YWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=