I've been able to reproduce this here by adjusting one of my mountpoints; for some reason I get additional information in my logs that didn't show up in yours, which provides the key:
usr1_handler: Received SIGUSR1 (network device up)
queue_fsck: /srv: no check required
mounting /srv
spawn: mount -a -t cifs -o credentials=/etc/samba/becquer.creds,rw,file_mode=0644 \becquer\media /srv
spawn: mount /srv [25768]
mount error: improperly formatted UNC name. \becquer\media does not begin with \\ or //
No ip address specified and hostname not found
mountall: mount /srv [25768] terminated with status 1
mountall: Filesystem could not be mounted: /srv
This is when using the \\host\share syntax in /etc/fstab.
As a workaround, you can switch your /etc/fstab entry from \\host\share to //host/share - the latter is the preferred syntax anyway, due to shell escaping issues with using \ on Unix.
Marking this triaged, this reproducible test case should be enough to isolate the bug.
I've been able to reproduce this here by adjusting one of my mountpoints; for some reason I get additional information in my logs that didn't show up in yours, which provides the key:
usr1_handler: Received SIGUSR1 (network device up) /etc/samba/ becquer. creds,rw, file_mode= 0644 \becquer\media /srv
queue_fsck: /srv: no check required
mounting /srv
spawn: mount -a -t cifs -o credentials=
spawn: mount /srv [25768]
mount error: improperly formatted UNC name. \becquer\media does not begin with \\ or //
No ip address specified and hostname not found
mountall: mount /srv [25768] terminated with status 1
mountall: Filesystem could not be mounted: /srv
This is when using the \\host\share syntax in /etc/fstab.
As a workaround, you can switch your /etc/fstab entry from \\host\share to //host/share - the latter is the preferred syntax anyway, due to shell escaping issues with using \ on Unix.
Marking this triaged, this reproducible test case should be enough to isolate the bug.