I have a unusual problem with putty connecting to several of my
virtual servers.  It is so strange, I tried STFW with the symptoms but
I can't find anything informative.

The client is a Windows 7 64-bit professional.  The servers are:
   * Fedora 14 beta
   * Centos 5.4 fully patched
   * 3x Debian Squeeze/Testing (fully up-to-date)

When SSH-ing into the Centos and one of the Debian boxes I can use
all the programs without any problem.  When SSH-ing into the Fedora
and two of the Debian boxes, I can run programs like 'ls' and 'cat'
that write small amounts of text to stdout, but if I start 'vim' or
'screen', I just get a blank screen.  Connecting again from a
different machine and running an 'echo "t" > /proc/sysrq-trigger'
I get this backtrace for the vim process:

[50583.985126] vim           S 0000000000000000     0  2613   2572 0x00000000
[50583.985126]  ffffffff814611f0 0000000000000082 0000000000000000 ffffffff81191988
[50583.985126]  0000000000000000 ffff88003f27b968 000000000000f9e0 ffff88003f27bfd8
[50583.985126]  0000000000015780 0000000000015780 ffff88003f3fa350 ffff88003f3fa648
[50583.985126] Call Trace:
[50583.985126]  [<ffffffff81191988>] ? rb_insert_color+0x66/0xe2
[50583.985126]  [<ffffffff810b809f>] ? zone_watermark_ok+0x20/0xb1
[50583.985126]  [<ffffffff810649f7>] ? bit_waitqueue+0x10/0xa0
[50583.985126]  [<ffffffff812fa693>] ? schedule_hrtimeout_range+0x4a/0x112
[50583.985126]  [<ffffffff8105a50d>] ? del_timer_sync+0xc/0x16
[50583.985126]  [<ffffffff810fb374>] ? poll_schedule_timeout+0x31/0x4f
[50583.985126]  [<ffffffff810fbf13>] ? do_select+0x528/0x57a
[50583.985126]  [<ffffffff810fc3df>] ? __pollwait+0x0/0xd6
[50583.985126]  [<ffffffff810fc4b5>] ? pollwake+0x0/0x5b
[50583.985126]  [<ffffffff810fc4b5>] ? pollwake+0x0/0x5b
[50583.985126]  [<ffffffffa019fc8a>] ? __ext4_journal_stop+0x63/0x69 [ext4]
[50583.985126]  [<ffffffffa018bdb5>] ? ext4_da_write_end+0x1fc/0x25a [ext4]
[50583.985126]  [<ffffffff810b4a11>] ? generic_file_buffered_write+0x1f5/0x278
[50583.985126]  [<ffffffff810b4e45>] ? __generic_file_aio_write+0x25f/0x293
[50583.985126]  [<ffffffff8104a139>] ? try_to_wake_up+0x2a7/0x2b9
[50583.985126]  [<ffffffff810fc0e9>] ? core_sys_select+0x184/0x21e
[50583.985126]  [<ffffffff81064ad6>] ? autoremove_wake_function+0x0/0x2e
[50583.985126]  [<ffffffff810cc64b>] ? handle_mm_fault+0x3b8/0x80f
[50583.985126]  [<ffffffff8106bfbb>] ? ktime_get_ts+0x68/0xb2
[50583.985126]  [<ffffffff810fc3b6>] ? sys_select+0x92/0xbb
[50583.985126]  [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b

But why would this happen with only two machines and not with the
other two?  All the Debian servers are virtual machines hosted on
the Fedora box.  They were installed from the same netinst iso and
updated just yesterday.

If I SSH into the Centos box and from there I SSH into any other box
(including the two troublesome Debian boxes) everything works fine as

Any ideas?


Bruce Schneier expects the Spanish Inquisition.
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