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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?WGZYZFR5SWNMdXM4eW9TSkpVZEYyVHhrQXdBdi92RHU0UTk0V3BRdzZnT1ov?= =?utf-8?B?b1BCcUNzU24xM2M3dFhSbURqMVNjbHZ2cERVaHd4ci9wbStaWEl1RjhIQkZx?= =?utf-8?B?bTQwamlZS0pFRjAxOWV0Tm1UMURyODVnR1E3dEt4NkxWRFNkeUc2OFpKMmx6?= =?utf-8?B?Q1U3YmFEL05zVExYK0Nsei9PeFk0eDQxNkhNUjFmWWIvczNXNE9OQTJrYkxv?= =?utf-8?B?ZXdQdHlpVTYxeG0zNTFRMVczWEJHTGpZVjc4cXJGSGRIeWFDNktsRzVKaTEx?= =?utf-8?B?NHFQZkY2MXV5SXVEQXAyamJNYXRmc2VwZExBMWRBUHIxMGlEM2tZQ3Fudzgw?= =?utf-8?B?RzR1NU5EME8rZzNoY3B0d0JNR2o2SkNFdUExTWt6a3Nhc1BuTWFUdlpFalpw?= =?utf-8?B?TjB2WUZEelFJL3JjUnVsc0pEYTc1Q01HM3V3NGkwcUlxSzJlbmZRNnVkQ1Y1?= =?utf-8?B?N1lML2dEVW5KemJBWEFDTjdIZFlRdmhkMGsyMjd5dFFqeDMzNXI0RkdWZnUx?= =?utf-8?B?OHNTOHJoaTQvL2Fqd3djWXZ2OUFULy9QcHV3KzNzUmtLZU9FS2JzQ3dNMGJF?= =?utf-8?B?Q2NUdGJWa0RJSHVwa3o1b0ovSjdOK3dGcG1IZXZnNXZLNWpyNFpwbW5qZjZ6?= =?utf-8?B?cmI4Mzhya2Z5L1p6ZG0wZTkzWGJtdGppd0FjQkFiK2RSZzZDcFhKdWgrMDNT?= =?utf-8?B?YUZnQXdUNVJId1RLeENFdnVFSWZKUU9iajRqS2kvMkl1SVFJTVFobTJSSmI4?= =?utf-8?B?VGcwcW9uR1draGl2VFY3MHRudFJkWVNGSjVrUGtVdkhvcmszTWhTcDBzQW84?= =?utf-8?B?MkpmT3pBcjlMNHVPcXBFNFdabWxTZDBhSU5hVllNeWRHNm1iTDhETEg1Y1pH?= =?utf-8?B?cHdKR2FWOHF6aXUzYTYxYWtPYTRwWHBPS1cwdmtVbm1OOSt0cUdBTTlTSzVp?= =?utf-8?B?NFFiOFIyM3JPSlFIY1BZdTI1VVBMUkllMG5aWVY0S295bzR3dzRQR21PQngz?= =?utf-8?B?dnIwUmxNbmhmcHNMRGU0VEhYRkhuU3krSy9TN0FERys3Y01jYmxVL3hXTUN3?= =?utf-8?B?MHhRZEZQOFp1MkxiaXFCNk5aT2xCUzVIRitaaTdnRHhEUkRDN25KcTdNNUZz?= =?utf-8?B?NEdEWU9nZWNmOVd1YWJsNHFyL1BiS2l2TTRIYlhrdys1VDRhVHptbVBBNW4y?= =?utf-8?B?WlkrQ0JwbEw5VGRacG00TGJQanJ3YVYzMjIrbGFpUFFJUWQvMGdtbkhZVVJN?= =?utf-8?B?bVNwd0U4R0JKdzFrR2dJQncwV0dVNHpFWTQyK0cxRFZoS1FhRTZpbi9ET1pC?= =?utf-8?Q?l/QfaI4voi81817yUS0zRk+2yWib5eDgj+?= X-MS-Exchange-CrossTenant-AuthSource: DS7PR03MB5608.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Dec 2020 08:28:45.4539 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-Network-Message-Id: b327aea6-b25f-4ab1-8c6d-08d898f7c835 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: A+wSMUz9CuE3zSFwWjzL3+mNlH0UNTchnLuVlNmIT8/tTrzLFGNNeUPxwrpVGfLULsJbWz8tINIqR/j220k+Mw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR03MB2633 X-OriginatorOrg: citrix.com On Fri, Dec 04, 2020 at 01:20:54PM +0100, Marek Marczykowski-Górecki wrote: > On Fri, Dec 04, 2020 at 01:08:03PM +0100, Christoph Hellwig wrote: > > On Fri, Dec 04, 2020 at 12:08:47PM +0100, Marek Marczykowski-Górecki wrote: > > > culprit: > > > > > > commit 9e2369c06c8a181478039258a4598c1ddd2cadfa > > > Author: Roger Pau Monne > > > Date: Tue Sep 1 10:33:26 2020 +0200 > > > > > > xen: add helpers to allocate unpopulated memory > > > > > > I'm adding relevant people and xen-devel to the thread. > > > For completeness, here is the original crash message: > > > > That commit definitively adds a new ZONE_DEVICE user, so it does look > > related. But you are not running on Xen, are you? > > I am. It is Xen dom0. I'm afraid I'm on leave and won't be able to look into this until the beginning of January. I would guess it's some kind of bad interaction between blkback and NVMe drivers both using ZONE_DEVICE? Maybe the best is to revert this change and I will look into it when I get back, unless someone is willing to debug this further. Thanks, Roger.