[Bugme-new] [Bug 20312] New: System freeze with multiples of 32 in /proc/sys/net/ipv4/tcp_adv_win_scale

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=20312

           Summary: System freeze with multiples of 32 in
                    /proc/sys/net/ipv4/tcp_adv_win_scale
           Product: Networking
           Version: 2.5
    Kernel Version: 2.6.36-rc6
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
        AssignedTo: shemminger at linux-foundation.org
        ReportedBy: tobs651 at gmx.de
                CC: ms at teamix.de
        Regression: No


System freezes when setting /proc/sys/net/ipv4/tcp_adv_win_scale to a multiple
of 32 and causing network traffic (for example ssh, wget, firefox, etc). Does
NOT happen with ping

It also happens with kernel 2.6.26 (debian lenny). 

there is no output via dmesg, no logging about any system events in
/var/log/messages or /var/log/syslog and nothing or on tty1



for example 

echo 32 > /proc/sys/net/ipv4/tcp_adv_win_scale
wget www.kernel.org



I tested
16 >> working
32 >> freeze
33 >> working
31 >> working
64 >> freeze
65 >> working
96 >> freeze
128 >> freeze

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