[linux-cifs-client] bad cifs hang

[Tucker Cunningham]

howdy -
   I've been running into a bug lately which I have not yet figured out 
how to reproduce, but when it does crop up it's bad.  When I get into 
this state, the following series of messages can be found in syslog 
repeating several times a second in an (apparently) infinite loop.  The 
only way to kill the offending process is to power-cycle the machine, it 
is immune to kill -9.  System also showed a high load average (~2.5 to 
3) at this point.
   The machine being connected to is running Windows XP Professional 
Service Pack 1.  Prior to observing this behavior, the shared folder was 
mounted on a linux box running kernel 2.6.13.  The shared folder was 
then deleted on this windows box.  Not exactly sure what operation got 
the process into the hung state.  I know this is not a huge amount of 
information, but it has been difficult to gather data about this bug 
since it is so transient . . . reproducing the above steps does not 
elicit the bug this morning.  Any thoughts or suggestions as to how to 
reproduce would be much appreciated.  Log output follows, thanks for help

-tucker

Nov 21 18:46:08 woodpecker kernel:  fs/cifs/cifssmb.c: Reading 49152 
bytes on fid 16384
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: For smb_command 114
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: Sending smb of 
length 47
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: rfc1002 
length(big endian)0x73)
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: Security Mode: 
0x3 Capabilities: 0xe3fd Time Zone: 480
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: In sesssetup
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: For smb_command 115
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: Sending smb of 
length 234
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: rfc1002 
length(big endian)0x87)
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c:  Guest login
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: UID = 2048
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: CIFS Session 
Established successfully
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: For smb_command 117
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: Sending smb of 
length 80
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: rfc1002 
length(big endian)0x42)
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: Tcon flags: 0x1
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/cifssmb.c: reconnect tcon rc = 0
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/file.c: CIFS VFS: in 
cifs_reopen_file as Xid: 1685067 with uid: 505
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/file.c:  inode = 0xc6e52748 
file flags are 0x8000 for \Gryffindor.adp
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: For smb_command 162
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: Sending smb of 
length 116
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: rfc1002 
length(big endian)0x6b)
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/inode.c: Getting info on 
\Gryffindor.adp
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: For smb_command 50
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: Sending smb of 
length 104
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: rfc1002 
length(big endian)0xfe)
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/inode.c:  Old time 135925588
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/inode.c:  New time 135925597
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/inode.c:  File inode
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/file.c: Exclusive Oplock 
granted on inode c6e52748
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/file.c: CIFS VFS: leaving 
cifs_reopen_file (xid = 1685067) rc = 0
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/cifssmb.c: Reading 49152 
bytes on fid 16384
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: For smb_command 46
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: Sending smb of 
length 59
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: rfc1002 
length(big endian)0xb63f)
Nov 21 18:46:08 woodpecker kernel:  CIFS VFS: Invalid size SMB length 4 
pdu_length 46655
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: Reconnecting tcp 
session
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: State: 0x3 Flags: 0x0
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: Post shutdown 
state: 0x3 Flags: 0x0
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/connect.c: Socket created
Nov 21 18:46:08 woodpecker kernel:  CIFS VFS: No response buffer
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/transport.c: marking request 
for retry
Nov 21 18:46:08 woodpecker kernel:  fs/cifs/misc.c: Null buffer passed 
to cifs_small_buf_release
Nov 21 18:46:08 woodpecker kernel:  CIFS VFS: Send error in read = -11

-- 
Tucker Cunningham
Integration Appliance Inc.
email: tucker at intapp.com
cell: 650.387.5980