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[79.181.91.42]) by smtp.gmail.com with ESMTPSA id h40sm35464987qth.4.2019.07.29.07.44.40 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 29 Jul 2019 07:44:46 -0700 (PDT) Date: Mon, 29 Jul 2019 10:44:38 -0400 From: "Michael S. Tsirkin" To: Jason Wang Subject: Re: WARNING in __mmdrop Message-ID: <20190729104028-mutt-send-email-mst@kernel.org> References: <11802a8a-ce41-f427-63d5-b6a4cf96bb3f@redhat.com> <20190726074644-mutt-send-email-mst@kernel.org> <5cc94f15-b229-a290-55f3-8295266edb2b@redhat.com> <20190726082837-mutt-send-email-mst@kernel.org> <20190726094756-mutt-send-email-mst@kernel.org> <0792ee09-b4b7-673c-2251-e5e0ce0fbe32@redhat.com> <20190729045127-mutt-send-email-mst@kernel.org> <4d43c094-44ed-dbac-b863-48fc3d754378@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4d43c094-44ed-dbac-b863-48fc3d754378@redhat.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190729_074448_881016_B0E6847D X-CRM114-Status: GOOD ( 26.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mhocko@suse.com, peterz@infradead.org, ldv@altlinux.org, james.bottomley@hansenpartnership.com, linux-mm@kvack.org, namit@vmware.com, mingo@kernel.org, elena.reshetova@intel.com, keescook@chromium.org, aarcange@redhat.com, davem@davemloft.net, hch@infradead.org, christian@brauner.io, syzbot , syzkaller-bugs@googlegroups.com, jglisse@redhat.com, viro@zeniv.linux.org.uk, linux-arm-kernel@lists.infradead.org, wad@chromium.org, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, luto@amacapital.net, ebiederm@xmission.com, akpm@linux-foundation.org, guro@fb.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gTW9uLCBKdWwgMjksIDIwMTkgYXQgMTA6MjQ6NDNQTSArMDgwMCwgSmFzb24gV2FuZyB3cm90 ZToKPiAKPiBPbiAyMDE5LzcvMjkg5LiL5Y2INDo1OSwgTWljaGFlbCBTLiBUc2lya2luIHdyb3Rl Ogo+ID4gT24gTW9uLCBKdWwgMjksIDIwMTkgYXQgMDE6NTQ6NDlQTSArMDgwMCwgSmFzb24gV2Fu ZyB3cm90ZToKPiA+ID4gT24gMjAxOS83LzI2IOS4i+WNiDk6NDksIE1pY2hhZWwgUy4gVHNpcmtp biB3cm90ZToKPiA+ID4gPiA+ID4gT2ssIGxldCBtZSByZXRyeSBpZiBuZWNlc3NhcnkgKGJ1dCBJ IGRvIHJlbWVtYmVyIEkgZW5kIHVwIHdpdGggZGVhZGxvY2tzCj4gPiA+ID4gPiA+IGxhc3QgdHJ5 KS4KPiA+ID4gPiA+IE9rLCBJIHBsYXkgYSBsaXR0bGUgd2l0aCB0aGlzLiBBbmQgaXQgd29ya3Mg c28gZmFyLiBXaWxsIGRvIG1vcmUgdGVzdGluZwo+ID4gPiA+ID4gdG9tb3Jyb3cuCj4gPiA+ID4g PiAKPiA+ID4gPiA+IE9uZSByZWFzb24gY291bGQgYmUgSSBzd2l0Y2ggdG8gdXNlIGdldF91c2Vy X3BhZ2VzX2Zhc3QoKSB0bwo+ID4gPiA+ID4gX19nZXRfdXNlcl9wYWdlc19mYXN0KCkgd2hpY2gg ZG9lc24ndCBuZWVkIG1tYXBfc2VtLgo+ID4gPiA+ID4gCj4gPiA+ID4gPiBUaGFua3MKPiA+ID4g PiBPSyB0aGF0IHNvdW5kcyBnb29kLiBJZiB3ZSBhbHNvIHNldCBhIGZsYWcgdG8gbWFrZQo+ID4g PiA+IHZob3N0X2V4Y2VlZHNfd2VpZ2h0IGV4aXQsIHRoZW4gSSB0aGluayBpdCB3aWxsIGJlIGFs bCBnb29kLgo+ID4gPiAKPiA+ID4gQWZ0ZXIgc29tZSBleHBlcmltZW50cywgSSBjYW1lIHVwIHR3 byBtZXRob2RzOgo+ID4gPiAKPiA+ID4gMSkgc3dpdGNoIHRvIHVzZSB2cS0+bXV0ZXgsIHRoZW4g d2UgbXVzdCB0YWtlIHRoZSB2cSBsb2NrIGR1cmluZyByYW5nZQo+ID4gPiBjaGVja2luZyAoYnV0 IEkgZG9uJ3Qgc2VlIG9idmlvdXMgc2xvd2Rvd24gZm9yIDE2dmNwdXMgKyAxNnF1ZXVlcykuIFNl dHRpbmcKPiA+ID4gZmxhZ3MgZHVyaW5nIHdlaWdodCBjaGVjayBzaG91bGQgd29yayBidXQgaXQg c3RpbGwgY2FuJ3QgYWRkcmVzcyB0aGUgd29yc3QKPiA+ID4gY2FzZTogd2FpdCBmb3IgdGhlIHBh Z2UgdG8gYmUgc3dhcHBlZCBpbi4gSXMgdGhpcyBhY2NlcHRhYmxlPwo+ID4gPiAKPiA+ID4gMikg dXNpbmcgY3VycmVudCBSQ1UgYnV0IHJlcGxhY2Ugc3luY2hyb25pemVfcmN1KCkgd2l0aCB2aG9z dF93b3JrX2ZsdXNoKCkuCj4gPiA+IFRoZSB3b3JzdCBjYXNlIGlzIHRoZSBzYW1lIGFzIDEpIGJ1 dCB3ZSBjYW4gY2hlY2sgcmFuZ2Ugd2l0aG91dCBob2xkaW5nIGFueQo+ID4gPiBsb2Nrcy4KPiA+ ID4gCj4gPiA+IFdoaWNoIG9uZSBkaWQgeW91IHByZWZlcj8KPiA+ID4gCj4gPiA+IFRoYW5rcwo+ ID4gSSB3b3VsZCByYXRoZXIgd2Ugc3RhcnQgd2l0aCAxIGFuZCBzd2l0Y2ggdG8gMiBhZnRlciB3 ZQo+ID4gY2FuIHNob3cgc29tZSBnYWluLgo+ID4gCj4gPiBCdXQgdGhlIHdvcnN0IGNhc2UgbmVl ZHMgdG8gYmUgYWRkcmVzc2VkLgo+IAo+IAo+IFllcy4KPiAKPiAKPiA+IEhvdyBhYm91dCBzZW5k aW5nIGEgc2lnbmFsIHRvCj4gPiB0aGUgdmhvc3QgdGhyZWFkPyAgV2Ugd2lsbCBuZWVkIHRvIGZp eCB1cCBlcnJvciBoYW5kbGluZyAoSSB0aGluayB0aGF0Cj4gPiBhdCB0aGUgbW9tZW50IGl0IHdp bGwgZXJyb3Igb3V0IGluIHRoYXQgY2FzZSwgaGFuZGxpbmcgdGhpcyBhcyBFRkFVTFQgLQo+ID4g YW5kIHdlIGRvbid0IHdhbnQgdG8gZHJvcCBwYWNrZXRzIGlmIHdlIGNhbiBoZWxwIGl0LCBhbmQg c3VyZWx5IG5vdAo+ID4gZW50ZXIgYW55IGVycm9yIHN0YXRlcy4gIEluIHBhcnRpY3VsYXIgaXQg bWlnaHQgYmUgZXNwZWNpYWxseSB0cmlja3kgaWYKPiA+IHdlIHdyb3RlIGludG8gdXNlcnNwYWNl IG1lbW9yeSBhbmQgYXJlIG5vdyB0cnlpbmcgdG8gbG9nIHRoZSB3cml0ZS4KPiA+IEkgZ3Vlc3Mg d2UgY2FuIGRpc2FibGUgdGhlIG9wdGltaXphdGlvbiBpZiBsb2cgaXMgZW5hYmxlZD8pLgo+IAo+ IAo+IFRoaXMgbWF5IHdvcmsgYnV0IHJlcXVpcmVzIGEgbG90IG9mIGNoYW5nZXMuCgpJIGFncmVl LgoKPiBBbmQgYWN0dWFsbHkgaXQncyB0aGUgcHJpY2Ugb2YKPiB1c2luZyB2cSBtdXRleC4gCgpO b3Qgc3VyZSB3aGF0J3MgbWVhbnQgaGVyZS4KCj4gQWN0dWFsbHksIHRoZSBjcml0aWNhbCBzZWN0 aW9uIHNob3VsZCBiZSByYXRoZXIgc21hbGwsIGUuZwo+IGp1c3QgaW5zaWRlIG1lbW9yeSBhY2Nl c3NvcnMuCgpBbHNvIHRydWUuCgo+IAo+IEkgd29uZGVyIHdoZXRoZXIgb3Igbm90IGp1c3QgZG8g c3luY2hyb25pemUgb3VyIHNlbGYgbGlrZToKPiAKPiBzdGF0aWMgdm9pZCBpbmxpbmUgdmhvc3Rf aW5jX3ZxX3JlZihzdHJ1Y3Qgdmhvc3RfdmlydHF1ZXVlICp2cSkKPiB7Cj4gwqDCoMKgwqDCoMKg wqAgaW50IHJlZiA9IFJFQURfT05DRSh2cS0+cmVmKTsKPiAKPiDCoMKgwqDCoMKgwqDCoCBXUklU RV9PTkNFKHZxLT5yZWYsIHJlZiArIDEpOwo+IHNtcF9ybWIoKTsKPiB9Cj4gCj4gc3RhdGljIHZv aWQgaW5saW5lIHZob3N0X2RlY192cV9yZWYoc3RydWN0IHZob3N0X3ZpcnRxdWV1ZSAqdnEpCj4g ewo+IMKgwqDCoMKgwqDCoMKgIGludCByZWYgPSBSRUFEX09OQ0UodnEtPnJlZik7Cj4gCj4gc21w X3dtYigpOwo+IMKgwqDCoMKgwqDCoMKgIFdSSVRFX09OQ0UodnEtPnJlZiwgcmVmIC0gMSk7Cj4g fQo+IAo+IHN0YXRpYyB2b2lkIGlubGluZSB2aG9zdF93YWl0X2Zvcl9yZWYoc3RydWN0IHZob3N0 X3ZpcnRxdWV1ZSAqdnEpCj4gewo+IMKgwqDCoMKgwqDCoMKgIHdoaWxlIChSRUFEX09OQ0UodnEt PnJlZikpOwo+IG1iKCk7Cj4gfQoKTG9va3MgZ29vZCBidXQgSSdkIGxpa2UgdG8gdGhpbmsgb2Yg YSBzdHJhdGVneS9leGlzdGluZyBsb2NrIHRoYXQgbGV0IHVzCmJsb2NrIHByb3Blcmx5IGFzIG9w cG9zZWQgdG8gc3Bpbm5pbmcsIHRoYXQgd291bGQgYmUgbW9yZSBmcmllbmRseSB0bwplLmcuIHRo ZSByZWFsdGltZSBwYXRjaC4KCj4gCj4gT3IgdXNpbmcgc21wX2xvYWRfYWNxdWlyZSgpL3NtcF9z dG9yZV9yZWxlYXNlKCkgaW5zdGVhZD8KPiAKPiBUaGFua3MKClRoZXNlIGFyZSBjaGVhcGVyIG9u IHg4NiwgeWVzLgoKPiA+IAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBs aXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlz dGluZm8vbGludXgtYXJtLWtlcm5lbAo=