Hi Salvatore, Attached is a proposed fix from Paulo for older kernels. Can you please confirm that this works for you too? Regards, Shyam -----Original Message----- From: Salvatore Bonaccorso On Behalf Of Salvatore Bonaccorso Sent: Sunday, April 18, 2021 6:11 PM To: Greg Kroah-Hartman Cc: Shyam Prasad ; linux-kernel@vger.kernel.org; stable@vger.kernel.org; Aurelien Aptel ; Steven French ; Sasha Levin Subject: Re: [EXTERNAL] Re: [PATCH 4.19 013/247] cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath. Hi Greg, On Mon, Apr 12, 2021 at 10:01:33AM +0200, Greg Kroah-Hartman wrote: > On Thu, Apr 08, 2021 at 01:41:05PM +0200, Salvatore Bonaccorso wrote: > > Hi Shyam, > > > > On Tue, Apr 06, 2021 at 05:01:17PM +0200, Salvatore Bonaccorso wrote: > > > Hi, > > > > > > On Tue, Apr 06, 2021 at 02:00:48PM +0000, Shyam Prasad wrote: > > > > Hi Greg, > > > > We'll need to debug this further to understand what's going on. > > > > > > Greg asked it the same happens with 5.4 as well, I do not know I > > > was not able to test 5.4.y (yet) but only 5.10.y and 4.19.y. > > > > > > > > Hi Salvatore, > > > > Any chance that you'll be able to provide us the cifsFYI logs from the time of mount failure? > > > > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F% > > > > 2Fwiki.samba.org%2Findex.php%2FLinuxCIFS_troubleshooting%23Enabl > > > > ing_Debugging&data=04%7C01%7CShyam.Prasad%40microsoft.com%7C > > > > 3f7f5a39dd974cacf6aa08d902674040%7C72f988bf86f141af91ab2d7cd011d > > > > b47%7C1%7C0%7C637543465194151840%7CUnknown%7CTWFpbGZsb3d8eyJWIjo > > > > iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C10 > > > > 00&sdata=nH2tcSzqFzzqLZ2RIARR008%2FuvBEdDHEnjKpVXhzIdk%3D&am > > > > p;reserved=0 > > > > > > Please find it attached. Is this enough information? > > > > > > The mentioned home DFS link 'home' is a DFS link to > > > msdfs:SECONDHOST\REDACTED on a Samba host. > > > > > > The mount is triggered as > > > > > > mount -t cifs //HOSTIP/REDACTED/home /mnt --verbose -o username='REDACTED,domain=DOMAIN' > > > > So I can confirm the issue is both present in 4.19.185 and 5.4.110 > > upstream (without any Debian patches applied, we do not anyway apply > > any cifs related one on top of the respetive upstream version). > > > > The issue is not present in 5.10.28. > > > > So I think there are commits as dependency of a738c93fb1c1 ("cifs: > > Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath.") > > which are required and not applied in the released before 5.10.y > > which make introducing the regression. > > Ok, I've dropped this from 5.4 and older kernel trees now, thanks for > the report. Thanks Greg! Shyam, Steven, now the commit was reverted for the older brnaches. But did you got a chance to find why it breaks for the older series? Regards, Salvatore