[Samba] macintosh disconnect problem

[Chad W Seys]

Hi all,
   We're having trouble with Macintosh clients (at least) being 
disconnected from Samba.  Below is one macintosh console output when 
this happens, filtered by "smb".  (Yeah, maybe some clues are missing...)
   ATM I don't see anything that stands out in the Samba log file. 
However one thing I don't see in the samba log file is session disconnects.
   Does anyone know how to log disconnects?  I've found one such way on 
stackexchange involving 'postexec' 
https://unix.stackexchange.com/a/478881/275843, but I thought maybe 
there was a log subsection and level which would also work.  (I don't 
want to set log 10 b/c that would generate so much log file it would 
either fill the drive or get rotated out.)

Thanks!
Chad.

apt-cache policy samba
samba:
   Installed: 2:4.9.5+dfsg-5+deb10u1

macintosh client console filtered with word "smb":

12/18/19 8:14:42.000 AM kernel[0]: smbfs_down: Remounting 
smb.physics.wisc.edu/SMB
12/18/19 8:14:42.000 AM kernel[0]: smb2_smb_parse_change_notify: 
smb_rq_reply failed 60
12/18/19 8:14:42.000 AM kernel[0]: smb2_smb_parse_change_notify: 
smb_rq_reply failed 60
12/18/19 8:14:42.000 AM kernel[0]: smb2_smb_parse_change_notify: 
smb_rq_reply failed 60
12/18/19 8:14:42.000 AM kernel[0]: smb2_smb_parse_change_notify: 
smb_rq_reply failed 60
12/18/19 8:14:42.000 AM kernel[0]: smb2_smb_parse_change_notify: 
smb_rq_reply failed 60
12/18/19 8:14:42.775 AM smbremountserver[23160]: 
isReferralPathNotCovered Dfs Check path on /smb.physics.wisc.edu/smb 
return ntstatus = 0xc000000d, syserr = Invalid argument
12/18/19 8:15:39.000 AM kernel[0]: smb2_rq_sign: No session key for signing.
12/18/19 8:15:40.000 AM kernel[0]: smbfs_vnop_strategy: READ on 
4867_rylander_timesheet_2016.xlsx failed with an error of 57
12/18/19 8:15:40.000 AM kernel[0]: smbfs_lookup: Server failed Query Info 57
12/18/19 8:15:40.403 AM KernelEventAgent[101]: tid 54485244 type 
'smbfs', mounted on '/Volumes/smb', from 
'//lefkow at smb.physics.wisc.edu/smb', dead
12/18/19 8:15:40.403 AM KernelEventAgent[101]: tid 54485244 force 
unmount //lefkow at smb.physics.wisc.edu/smb from /Volumes/smb
12/18/19 8:15:40.455 AM deleted[2105]: volumeFreespace:548 statfs failed 
for /Volumes/smb : No such file or directory
12/18/19 8:15:40.456 AM deleted[2105]: normalizeUserMountpoint:791 
volRoot failed for /Volumes/smb
12/18/19 8:15:40.456 AM deleted[2105]: _validateVolume:813 unable to 
normalize volume: "/Volumes/smb", vol: (null)
12/18/19 8:15:40.458 AM deleted[2105]: volumeFreespace:548 statfs failed 
for /Volumes/smb : No such file or directory
12/18/19 8:15:40.458 AM deleted[2105]: normalizeUserMountpoint:791 
volRoot failed for /Volumes/smb
12/18/19 8:15:40.458 AM deleted[2105]: _validateVolume:813 unable to 
normalize volume: "/Volumes/smb", vol: (null)
12/18/19 8:15:40.471 AM deleted[2105]: volumeFreespace:548 statfs failed 
for /Volumes/smb : No such file or directory
12/18/19 8:15:40.471 AM deleted[2105]: normalizeUserMountpoint:791 
volRoot failed for /Volumes/smb
12/18/19 8:15:40.471 AM deleted[2105]: _validateVolume:813 unable to 
normalize volume: "/Volumes/smb", vol: (null)
12/18/19 8:15:40.547 AM TMCacheDelete[2183]: Couldn't get resource value 
'NSURLVolumeIsLocalKey' for 'file:///Volumes/smb/': Error 
Domain=NSCocoaErrorDomain Code=4 "The file “smb” doesn’t exist." 
UserInfo={NSURL=file:///Volumes/smb/, NSFilePath=/Volumes/smb}
12/18/19 8:15:40.548 AM deleted[2105]: volumeFreespace:548 statfs failed 
for /Volumes/smb : No such file or directory
12/18/19 8:15:40.548 AM deleted[2105]: normalizeUserMountpoint:791 
volRoot failed for /Volumes/smb
12/18/19 8:15:40.548 AM deleted[2105]: _validateVolume:813 unable to 
normalize volume: "/Volumes/smb", vol: (null)
12/18/19 8:15:40.568 AM deleted[2105]: normalizeUserMountpoint:791 
volRoot failed for /Volumes/smb
12/18/19 8:15:40.568 AM deleted[2105]: _validateVolume:813 unable to 
normalize volume: "/Volumes/smb", vol: (null)
12/18/19 8:15:40.568 AM deleted[2105]: -[CacheDeleteOperation 
initWithInfo:services:]:33 Unable to validate volume: /Volumes/smb

12/18/19 8:15:40.547 AM TMCacheDelete[2183]: Couldn't get resource value 
'NSURLVolumeIsLocalKey' for 'file:///Volumes/smb/': Error 
Domain=NSCocoaErrorDomain Code=4 "The file “smb” doesn’t exist." 
UserInfo={NSURL=file:///Volumes/smb/, NSFilePath=/Volumes/smb}

   I'm having trouble with Macintosh clients being disconnected
https://unix.stackexchange.com/a/478881/275843