Hi Kristian, thanks for looking into this!
So it seems server side processing is dependent on whether the file has a brl nor not. Until now all my tests were always taking a brl.
Modifying the test to not take a brl (and I'm going to duplicate my whole test matrix to cover both cases), the behavior changes to
1. Client 1 opens a file with PH, lease=RH, sharemode=NONE 2. Client 1 disconnects TCP3. Client 2 wants to open the file for reading, server returns STATUS_PENDING
4. Client 1 reconnects SMB 5. Client 1 reconnects PH and in the response the lease state is RH 6. Server sends lease break RH->R to client 1, client 1 ACKs the break7. Server continues to process CREATE from step 3 and fails the request with STATUS_SHARING_VIOLATION.
So it the absence vs presence of a brl *completely* changes server processing. I'm currently a bit lost trying to make sense of it, figuring out the guiding principles all this is based on.
Thanks! -slow On 9/8/25 7:27 PM, Kristian Smith wrote:
Hi Slow, With regard to the following circumstance for which you've outlined and gathered traces: " 1. Client 1 opens a file with PH, lease=RH, sharemode=NONE 2. Client 1 disconnects TCP 3. Client 2 wants to open the file for reading, this fails with STATUS_FILE_NOT_AVAILABLE 4. Client 1 reconnects SMB 5. Client 1 reconnects PH and in the response the lease state is NONE (and the epoch is unchanged) " I've debugged the scenario after locating the smbtorture test used and found that Windows has a condition where an existing byte range lock on a file will cause a reconnect request with RH to result in a response with a lease state of NONE. This is a unique scenario that I will work with the documentation team to specify in [MS-FSA]. Thanks for bringing this to our attention and helping us maintain accuracy in the docs. If you have any questions or concerns, please let me know. Regards, Kristian Smith Support Escalation Engineer | Microsoft® Corporation Email: kristian.sm...@microsoft.com -----Original Message----- From: Kristian Smith Sent: Wednesday, August 27, 2025 3:25 PM To: 'Ralph Boehme' <s...@samba.org> Cc: 'cifs-protocol@lists.samba.org' <cifs-protocol@lists.samba.org>; Microsoft Support <supportm...@microsoft.com> Subject: RE: [MS-SMB2] disconnected PH looses RH lease - TrackingID#2508130040006291 Hi Slow, I just wanted to let you know that I've received your traces and I'm currently investigating. I will be out of the office until the 2nd of September, but will return to my investigation at that time. If an urgent question arises in the meantime, please reach out to doch...@microsoft.com. Thanks for your patience. Regards, Kristian Smith Support Escalation Engineer | Microsoft® Corporation Email: kristian.sm...@microsoft.com -----Original Message----- From: Kristian Smith Sent: Tuesday, August 19, 2025 12:53 PM To: Ralph Boehme <s...@samba.org> Cc: cifs-protocol@lists.samba.org; Microsoft Support <supportm...@microsoft.com> Subject: RE: [MS-SMB2] disconnected PH looses RH lease - TrackingID#2508130040006291 Hi Slow, I'm looking into this issue for you. I think it would be easier to diagnose with the network and t.cmd traces. Would you please upload them to the link below? Collect SMB traces with t.cmd and gather WireShark trace 1. Rename t.txt to t.cmd (file is attached) 2. Open Command Prompt as Administrator (PowerShell works too, you just need to enter the command “cmd” when it opens) 3. Navigate to the directory of t.cmd 4. Run “t.cmd srvon” 5. Start a network trace with WireShark 5. Reproduce the scenario 6. End network trace 6. Run “t.cmd off” 7. Upload the .cab file and network trace via link provided: https://support.microsoft.com/files?workspace=eyJhbGciOiJSUzI1NiIsImtpZCI6IjUwNjQwRTE0NEREODg5MzE5NzYzRTBFNjM5RjMzNjdFQUNDNzlBRDAiLCJ0eXAiOiJKV1QifQ.eyJ3c2lkIjoiOTE5NDM3ODAtNGUxZS00NzllLTk3NDgtMDBkOWNhNmY5MGQ2Iiwic3IiOiIyNTA4MTMwMDQwMDA2MjkxIiwic3YiOiJ2MSIsInJzIjoiRXh0ZXJuYWwiLCJ3dGlkIjoiMzY0ZDM0OWQtMWJiYi00NzYzLTllMTYtYjI1YjYyM2JkMTExIiwiYXBwaWQiOiI0ZTc2ODkxZC04NDUwLTRlNWUtYmUzOC1lYTNiZDZlZjIxZTUiLCJuYmYiOjE3NTU2MzMwMjUsImV4cCI6MTc2MzQwOTAyNCwiaWF0IjoxNzU1NjMzMDI1LCJpc3MiOiJodHRwczovL2FwaS5kdG1uZWJ1bGEubWljcm9zb2Z0LmNvbSIsImF1ZCI6Imh0dHA6Ly9zbWMifQ.fI8Km4wuEKzQV-vlA61yxw1UKkJLSNK4CH7LSRPGpFJw4B_usMsnDfWPj_MD7br6XLh-GLLhtRmAYhCiHcFciAt7pA4gTpFZBZGCpdYdVHCO4v3YVr7tMtLmN6nhtyo8xVpBFor04jA5nzYnSDThqmWZEGxW5Oc4dFqQ_aEfacCYn68KwqxgvqasQjGht9AV_Kdrz8L2oyHd2zgBaxR_Jag1VfF5nDexuJoVRR37kdvvMwCPZq-qZlGaVJtkgwk3t6ZE2lgF8laQOoZVYmwmKRJW1hub_beA6iTKT0EMV0H2XSwZAW9H744hUdnd41OePbzqUs43_IcDLq2mkxM7FQ&wid=91943780-4e1e-479e-9748-00d9ca6f90d6 Let me know if you have any issues collecting the smb trace. Thanks for your time. Regards, Kristian Smith Support Escalation Engineer | Microsoft® Corporation Email: kristian.sm...@microsoft.com -----Original Message----- From: Kristian Smith Sent: Wednesday, August 13, 2025 8:36 AM To: Ralph Boehme <s...@samba.org> Cc: cifs-protocol@lists.samba.org; Microsoft Support <supportm...@microsoft.com> Subject: RE: [MS-SMB2] disconnected PH looses RH lease - TrackingID#2508130040006291 [DocHelp to Bcc] Hi Slow, Thanks again for your Persistent Handle question. I've created case 2508130040006291 to track the issue. One of our engineers will investigate this and reach out to you soon. Regards, Kristian Smith Support Escalation Engineer | Microsoft® Corporation Email: kristian.sm...@microsoft.com -----Original Message----- From: Ralph Boehme <s...@samba.org> Sent: Wednesday, August 13, 2025 3:33 AM To: Interoperability Documentation Help <doch...@microsoft.com> Cc: cifs-protocol@lists.samba.org Subject: [EXTERNAL] MS-SMB2: disconnected PH looses RH lease Hello dochelp, another one... :) I see the following unexpected behaviour against a Windows server with Fileserver for General Use role where a Persistent Handle with lease=RH is silently downgraded to NONE: 1. Client 1 opens a file with PH, lease=RH, sharemode=NONE 2. Client 1 disconnects TCP 3. Client 2 wants to open the file for reading, this fails with STATUS_FILE_NOT_AVAILABLE 4. Client 1 reconnects SMB 5. Client 1 reconnects PH and in the response the lease state is NONE (and the epoch is unchanged) Accoding to "3.3.4.7 Object Store Indicates a Lease Break" it is ok to loose an R lease, but not an RH lease, similarly "SMB 2.2 : Bigger, Faster, Scalier (Part 2)", page 50, states breaking from RH to none is "illegal". Can you please clarify? Traces (pcap + t.cmd) available. Thanks! -slow
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