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
