Package: samba Version: 2:4.2.10+dfsg-0+deb8u2 Followup-For: Bug #803941 It seems that the bug happens when using too big read buffer.
I can work around it on client side by either: 1) mounting with "-o rsize=16384" (or actually any number lower than 131071, which is 2^17-1; just playing it safe here) by default mount.cifs from Debian Jessie with kernel linux-image-3.16.0-4-amd64 3.16.7-ckt25-2 will do mount with CIFS 1.0 and too big rsize: //merlin.tomsoft.lan/ganeti2-blade /var/lib/ganeti/export cifs rw,relatime,vers=1.0,cache=strict,domain=MERLIN,uid=0,noforceuid,gid=0,noforcegid,addr=10.66.2.10,unix,posixpaths,serverino,acl,rsize=1048576,wsize=65536,actimeo=1 0 0 2) mounting with (at least) "-o vers=3.0" (or anything at or above 2.0; which seems to force rsize=65536) (Unfortunately, trying to force it on the server side with "client min protocol = SMB2" does not seem to work maybe some of the cache/aio options would, but it is production samba server here which I can't disturb too much...) -- System Information: Debian Release: 8.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores) Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) Shell: /bin/sh linked to /bin/dash Init: sysvinit (via /sbin/init) Versions of packages samba depends on: ii adduser 3.113+nmu3 ii dpkg 1.17.26 ii libbsd0 0.7.0-2 ii libc6 2.19-18+deb8u4 ii libhdb9-heimdal [heimdal-hdb-api-8] 1.6~rc2+dfsg-9 ii libldb1 2:1.1.20-0+deb8u1 ii libpam-modules 1.1.8-3.1+deb8u1+b1 ii libpam-runtime 1.1.8-3.1+deb8u1 ii libpopt0 1.16-10 ii libpython2.7 2.7.9-2 ii libtalloc2 2.1.2-0+deb8u1 ii libtdb1 1.3.6-0+deb8u1 ii libtevent0 0.9.25-0+deb8u1 ii lsb-base 4.1+Debian13+nmu1 ii multiarch-support 2.19-18+deb8u4 ii procps 2:3.3.9-9 ii python 2.7.9-1 ii python-dnspython 1.12.0-1 ii python-ntdb 1.0-5 ii python-samba 2:4.2.10+dfsg-0+deb8u2 pn python2.7:any <none> ii samba-common 2:4.2.10+dfsg-0+deb8u2 ii samba-common-bin 2:4.2.10+dfsg-0+deb8u2 ii samba-dsdb-modules 2:4.2.10+dfsg-0+deb8u2 ii samba-libs 2:4.2.10+dfsg-0+deb8u2 ii tdb-tools 1.3.6-0+deb8u1 ii update-inetd 4.43 Versions of packages samba recommends: pn attr <none> ii logrotate 3.8.7-1+b1 pn samba-vfs-modules <none> Versions of packages samba suggests: pn bind9 <none> pn bind9utils <none> pn ctdb <none> pn ldb-tools <none> ii ntp 1:4.2.6.p5+dfsg-7+deb8u1 pn smbldap-tools <none> pn winbind <none> -- debconf information: samba-common/title: samba/run_mode: daemons