Most recent kernel where this bug did not occur:
Distribution: Fedora Core release 3 (Heidleberg)
Hardware Environment:
Software Environment: File system mounted with "mount -t nfs". No specific 
option.
Problem Description: A process with a BLOCKED range lock request is killed. It 
sends a NLM_CANCEL request to the server to cancel the blocked range lock 
request. The issue is that it sets "block=false" in the NLM_CANCEL request. 
Thus, the cancel req doesn't match the pending lock req. which has block=true. 
The server replies the NLM_CANCEL with DENIED status.
The NLM protocol says that block field in NLM_CANCEL must be set to true.

Steps to reproduce: I use fcntl() to take the blocking range lock from 2 
different processes. Then I use "kill -9 <pid>" to kill the process with the 
blocking lock request.

Frame 1646 (266 bytes on wire, 266 bytes captured)
Internet Protocol, Src: 10.64.220.148 , Dst: 192.168.8.92
Transmission Control Protocol, Src Port: 796 , Dst Port: 59915
Remote Procedure Call, XID:0xfbd662da    // XID++ at each retry
Network Lock Manager Protocol
    V4 Procedure: LOCK (2)
    cookie: <DATA>
        length: 4
        contents: <DATA> // 0x35120000
    block: Yes
    exclusive: Yes
    lock
        caller_name: newlnxjlr
        fh
        owner: <DATA>
            contents: <DATA>   // "5065@newlnxjlr"
        svid: 5065
        l_offset: 10
        l_len: 20
    reclaim: No

Frame 1647 (106 bytes on wire, 106 bytes captured)
Internet Protocol, Src: 192.168.8.92 , Dst: 10.64.220.148
Transmission Control Protocol, Src Port: 59915 , Dst Port: 796
Remote Procedure Reply XID:0xfbd662da
Network Lock Manager Protocol
    V4 Procedure: LOCK (2)
    cookie: <DATA>
        length: 4
        contents: <DATA> // 0x35120000 -> 0x1235
    stat: NLM_BLOCKED (3)

Frame 1648 (258 bytes on wire, 258 bytes captured)
Internet Protocol, Src: 10.64.220.148 , Dst: 192.168.8.92
Transmission Control Protocol, Src Port: 796 , Dst Port: 59915
Remote Procedure Call, XID:0xfcd662da
Network Lock Manager Protocol
    V4 Procedure: CANCEL (3)
    cookie: <DATA>
        length: 4
        contents: <DATA> // 0x36120000 -> 0x1236
    block: No   <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
    exclusive: Yes
    lock
        caller_name: newlnxjlr
        fh
        owner: <DATA>
            contents: <DATA>   // "5065@newlnxjlr"
        svid: 5065
        l_offset: 10
        l_len: 20

Frame 1649 (106 bytes on wire, 106 bytes captured)
Internet Protocol, Src: 192.168.8.92 , Dst: 10.64.220.148
Transmission Control Protocol, Src Port: 59915 , Dst Port: 796
Remote Procedure Reply XID:0xfcd662da
Network Lock Manager Protocol
    V4 Procedure: CANCEL (3)
    cookie: <DATA>
        length: 4
        contents: <DATA> // 0x36120000 -> 0x1236
    stat: NLM_DENIED (1)