RE: issues with CIFS on Ubuntu 20 mounting Windows 2019

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> EINTR on read ... Hundreds of times?! I have seen scp do that by sending signals but in writes not reads

Not using scp at the moment.

> Could an app be sending signals trying to kill the process doing the reads?

Not that I'm aware of. I'm not sure exactly how I'd check that, but I will look into it.

One other thing that came to mind that may be helpful is that one of the processes doing the most IO is running under mono 6.8.0.105

-scott




From: Steve French <smfrench@xxxxxxxxx> 
Sent: Friday, May 1, 2020 12:07 AM
To: Scott M. Lewandowski <vgerkernel@xxxxxxxxxx>
Cc: CIFS <linux-cifs@xxxxxxxxxxxxxxx>
Subject: Re: issues with CIFS on Ubuntu 20 mounting Windows 2019

EINTR on read ... Hundreds of times?! I have seen scp do that by sending signals but in writes not reads

On Thu, Apr 30, 2020, 23:48 Scott M. Lewandowski <mailto:vgerkernel@xxxxxxxxxx> wrote:
I have an Ubuntu 20.04 box mounting shares from a Windows 2019 server. Both boxes are fully patched. They are resident on the same hypervisor and communicating directly via a vSwitch. I have 4 shares mounted; here is an example from my fstab (yes, I know I should move the credential file):

//file1/usenet /mnt/usenet cifs vers=3.0,uid=scott,credentials=/home/scott/.smbcredentials,noserverino,nounix,iocharset=utf8 0 0

My kernel is 5.4.0-28-generic and mount.cifs version is 6.9. The contents of DebugData are included below.

Right after the mount, I see a duplicate cookie reported. It is unclear if this is a problem or not. Following that, I periodically see messages similar to the following repeated in dmesg:

[  179.625296] SMB2_read: 9 callbacks suppressed
[  179.625298] CIFS VFS: Send error in read = -4
[  179.704191] CIFS VFS: Send error in read = -4
[  179.847514] CIFS VFS: Send error in read = -4
[  180.031516] CIFS VFS: Send error in read = -4
[  180.214848] CIFS VFS: Send error in read = -4
[  180.282909] CIFS VFS: Send error in read = -4
[  180.474829] CIFS VFS: Send error in read = -4
[  180.621349] CIFS VFS: Send error in read = -4
[  180.780465] CIFS VFS: Send error in read = -4
[  180.823249] CIFS VFS: Send error in read = -4
[  182.339351] CIFS VFS: Close unmatched open
[  182.726829] CIFS VFS: Close unmatched open
[  184.292663] CIFS VFS: Close unmatched open
[  184.501185] CIFS VFS: Close unmatched open
[  191.784922] SMB2_read: 4 callbacks suppressed
[  191.784925] CIFS VFS: Send error in read = -4
[  191.884186] CIFS VFS: Send error in read = -4
[  192.270851] CIFS VFS: Send error in read = -4
[  192.323467] CIFS VFS: Send error in read = -4
[  192.381336] CIFS VFS: Send error in read = -4
[  192.446711] CIFS VFS: Send error in read = -4
[  192.507605] CIFS VFS: Send error in read = -4
[  193.244397] CIFS VFS: Send error in read = -4
[  193.307588] CIFS VFS: Send error in read = -4
[  193.403410] CIFS VFS: Send error in read = -4
[  193.797038] CIFS VFS: Close unmatched open
[  196.784082] CIFS VFS: Close unmatched open
[  198.247594] CIFS VFS: Close unmatched open

Here is the duplicate cookie info:

[   21.713307] FS-Cache: Duplicate cookie detected
[   21.713840] FS-Cache: O-cookie c=00000000e8276279 [p=0000000079ef0365 fl=222 nc=0 na=1]
[   21.714330] FS-Cache: O-cookie d=00000000173ea0ee n=00000000243f210c
[   21.714779] FS-Cache: O-key=[8] '020001bdc0a801af'
[   21.715219] FS-Cache: N-cookie c=00000000afb49d9c [p=0000000079ef0365 fl=2 nc=0 na=1]
[   21.715672] FS-Cache: N-cookie d=00000000173ea0ee n=00000000dd1465c5
[   21.716141] FS-Cache: N-key=[8] '020001bdc0a801af'
[   21.716591] FS-Cache: Duplicate cookie detected
[   21.717217] FS-Cache: O-cookie c=00000000e8276279 [p=0000000079ef0365 fl=222 nc=0 na=1]
[   21.717679] FS-Cache: O-cookie d=00000000173ea0ee n=00000000243f210c
[   21.718220] FS-Cache: O-key=[8] '020001bdc0a801af'
[   21.718681] FS-Cache: N-cookie c=0000000063665cf7 [p=0000000079ef0365 fl=2 nc=0 na=1]
[   21.719166] FS-Cache: N-cookie d=00000000173ea0ee n=00000000e757f917
[   21.719621] FS-Cache: N-key=[8] '020001bdc0a801af'
[   21.720097] FS-Cache: Duplicate cookie detected
[   21.720565] FS-Cache: O-cookie c=00000000e8276279 [p=0000000079ef0365 fl=222 nc=0 na=1]
[   21.721053] FS-Cache: O-cookie d=00000000173ea0ee n=00000000243f210c
[   21.721518] FS-Cache: O-key=[8] '020001bdc0a801af'
[   21.721994] FS-Cache: N-cookie c=00000000d479c294 [p=0000000079ef0365 fl=2 nc=0 na=1]
[   21.722476] FS-Cache: N-cookie d=00000000173ea0ee n=00000000ca1891fa
[   21.722941] FS-Cache: N-key=[8] '020001bdc0a801af'

Any ideas what could be going on? 

Thanks for any help!






DebugData:
CIFS Version 2.23
Features: DFS,FSCACHE,STATS,DEBUG,ALLOW_INSECURE_LEGACY,WEAK_PW_HASH,CIFS_POSIX,UPCALL(SPNEGO),XATTR,ACL
CIFSMaxBufSize: 16384
Active VFS Requests: 0
Servers:
Number of credits: 8190 Dialect 0x300
1) Name: 192.168.1.175 Uses: 1 Capability: 0x300067     Session Status: 1 TCP status: 1 Instance: 1
        Local Users To Server: 1 SecMode: 0x1 Req On Wire: 0 SessionId: 0x100080000021
        Shares:
        0) IPC: \\file1\IPC$ Mounts: 1 DevInfo: 0x0 Attributes: 0x0
        PathComponentMax: 0 Status: 1 type: 0 Serial Number: 0x0
        Share Capabilities: None        Share Flags: 0x30
        tid: 0x1        Maximal Access: 0x11f01ff

        1) \\file1\XXX Mounts: 1 DevInfo: 0x20020 Attributes: 0x8500df
        PathComponentMax: 255 Status: 1 type: DISK Serial Number: 0xa3c339a0
        Share Capabilities: None Aligned, Partition Aligned,    Share Flags: 0x0
        tid: 0x5        Optimal sector size: 0x200      Maximal Access: 0x1f01ff

        MIDs:

        Server interfaces: 2
        0)      Speed: 10000000000 bps
                Capabilities:
                IPv6: fe80:0000:0000:0000:71cb:1839:1069:9806
        1)      Speed: 10000000000 bps
                Capabilities:
                IPv4: 192.168.1.175
Number of credits: 8190 Dialect 0x300

2) Name: 192.168.1.175 Uses: 1 Capability: 0x300067     Session Status: 1 TCP status: 1 Instance: 1
        Local Users To Server: 1 SecMode: 0x1 Req On Wire: 0 SessionId: 0x10006c000019
        Shares:
        0) IPC: \\file1\IPC$ Mounts: 1 DevInfo: 0x0 Attributes: 0x0
        PathComponentMax: 0 Status: 1 type: 0 Serial Number: 0x0
        Share Capabilities: None        Share Flags: 0x30
        tid: 0x1        Maximal Access: 0x11f01ff

        1) \\file1\usenet Mounts: 1 DevInfo: 0x20020 Attributes: 0x8500df
        PathComponentMax: 255 Status: 1 type: DISK Serial Number: 0xa3c339a0
        Share Capabilities: None Aligned, Partition Aligned,    Share Flags: 0x0
        tid: 0x5        Optimal sector size: 0x200      Maximal Access: 0x1f01ff

        MIDs:

        Server interfaces: 2
        0)      Speed: 10000000000 bps
                Capabilities:
                IPv6: fe80:0000:0000:0000:71cb:1839:1069:9806
        1)      Speed: 10000000000 bps
                Capabilities:
                IPv4: 192.168.1.175


3) Name: 192.168.1.175 Uses: 1 Capability: 0x300067     Session Status: 1 TCP status: 1 Instance: 1
        Local Users To Server: 1 SecMode: 0x1 Req On Wire: 2 SessionId: 0x10007c000061
        Shares:
        0) IPC: \\file1\IPC$ Mounts: 1 DevInfo: 0x0 Attributes: 0x0
        PathComponentMax: 0 Status: 1 type: 0 Serial Number: 0x0
        Share Capabilities: None        Share Flags: 0x30
        tid: 0x1        Maximal Access: 0x11f01ff

        1) \\file1\YYY Mounts: 1 DevInfo: 0x20020 Attributes: 0x8500df
        PathComponentMax: 255 Status: 1 type: DISK Serial Number: 0xa3c339a0
        Share Capabilities: None Aligned, Partition Aligned,    Share Flags: 0x0
        tid: 0x5        Optimal sector size: 0x200      Maximal Access: 0x1f01ff

        MIDs:
        State: 2 com: 8 pid: 1218 cbdata: 00000000e45c59d2 mid 1211489
        State: 2 com: 8 pid: 1218 cbdata: 0000000018476195 mid 1211553

        Server interfaces: 2
        0)      Speed: 10000000000 bps
                Capabilities:
                IPv6: fe80:0000:0000:0000:71cb:1839:1069:9806
        1)      Speed: 10000000000 bps
                Capabilities:
                IPv4: 192.168.1.175

Number of credits: 8190 Dialect 0x300
4) Name: 192.168.1.175 Uses: 1 Capability: 0x300067     Session Status: 1 TCP status: 1 Instance: 1
        Local Users To Server: 1 SecMode: 0x1 Req On Wire: 0 SessionId: 0x10006c000055
        Shares:
        0) IPC: \\file1\IPC$ Mounts: 1 DevInfo: 0x0 Attributes: 0x0
        PathComponentMax: 0 Status: 1 type: 0 Serial Number: 0x0
        Share Capabilities: None        Share Flags: 0x30
        tid: 0x1        Maximal Access: 0x11f01ff

        1) \\file1\ZZZ Mounts: 1 DevInfo: 0x20020 Attributes: 0x8500df
        PathComponentMax: 255 Status: 1 type: DISK Serial Number: 0xa3c339a0
        Share Capabilities: None Aligned, Partition Aligned,    Share Flags: 0x0
        tid: 0x5        Optimal sector size: 0x200      Maximal Access: 0x1f01ff

        MIDs:

        Server interfaces: 2
        0)      Speed: 10000000000 bps
                Capabilities:
                IPv6: fe80:0000:0000:0000:71cb:1839:1069:9806
        1)      Speed: 10000000000 bps
                Capabilities:
                IPv4: 192.168.1.175




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