migration home errors

Hi,

Our cluster has dual AMD Opteron nodes. 
With   2.6.11.12-om kernel , compiled with enabled SMP option.

Migrating a task with
echo "192.168.1.1" > /proc/724/om/where 
work fine
but if i try to move it home with
echo "home" > /proc/724/om/where
kernel dump debug message and kill the task

Is that a known behavior,
is there a workaround?

Thanks,
   Alex Bezergikov


>>Dump message<<

Nov  9 14:25:22 euc126 kernel: Unable to handle kernel NULL pointer 
dereference at 0000000000000288 RIP: 
Nov  9 14:25:22 euc126 kernel: <ffffffff8024a087>{arch_mig_send_pre+7}
Nov  9 14:25:22 euc126 kernel: PGD 9a500067 PUD e525e067 PMD 0 
Nov  9 14:25:22 euc126 kernel: Oops: 0000 [7] SMP 
Nov  9 14:25:22 euc126 kernel: CPU 0 
Nov  9 14:25:22 euc126 kernel: Modules linked in: raw iptable_filter ip_tables 
ip6table_filter ip6_tables floppy edd freq_table thermal autofs processor fan 
button battery ac ipv6
 joydev sg st sr_mod hw_random e100 mii i2c_amd8111 i2c_core ohci_hcd 
binfmt_misc evdev dm_mod usbcore tg3
Nov  9 14:25:22 euc126 kernel: Pid: 724, comm: create_load_and Not tainted 
2.6.11.12-om
Nov  9 14:25:22 euc126 kernel: RIP: 0010:[<ffffffff8024a087>] 
<ffffffff8024a087>{arch_mig_send_pre+7}
Nov  9 14:25:22 euc126 kernel: RSP: 0018:ffff810090600df0  EFLAGS: 00010292
Nov  9 14:25:22 euc126 kernel: RAX: 0000000000000000 RBX: ffff8100fa7ac0f0 
RCX: 0000000000000002
Nov  9 14:25:22 euc126 kernel: RDX: 0000000000000000 RSI: 00000000000005b4 
RDI: ffff8100fa7ac0f0
Nov  9 14:25:22 euc126 kernel: RBP: ffff8100948b3780 R08: 0000000000000000 
R09: 00000000000016d0
Nov  9 14:25:22 euc126 kernel: R10: 00000000000016d0 R11: 0000000000000002 
R12: ffff8100fa7ac0f0
Nov  9 14:25:22 euc126 kernel: R13: 0000000000000000 R14: ffff810090601ae0 
R15: 0000000000000000
Nov  9 14:25:22 euc126 kernel: FS:  00002aaaab28b800(0000) GS:ffffffff80534880
(005b) knlGS:00000000557212a0
Nov  9 14:25:22 euc126 kernel: CS:  0010 DS: 002b ES: 002b CR0: 
000000008005003b
Nov  9 14:25:22 euc126 kernel: CR2: 0000000000000288 CR3: 00000000c6b4a000 
CR4: 00000000000006e0
Nov  9 14:25:22 euc126 kernel: Process create_load_and (pid: 724, threadinfo 
ffff810090600000, task ffff8100fa7ac0f0)
Nov  9 14:25:22 euc126 kernel: Stack: ffffffff80247965 ffff8100fa7ac368 
0000000000000286 0000000000000000 
Nov  9 14:25:22 euc126 kernel:        0000000000000001 0000000000000296 
ffffffff80330e07 0000000000000000 
Nov  9 14:25:22 euc126 kernel:        0000000000000292 0000000000000292 
Nov  9 14:25:22 euc126 kernel: Call Trace:<ffffffff80247965>{mig_do_send+21} 
<ffffffff80330e07>{memcpy_toiovec+55} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8014ad15>{__mod_timer+309} 
<ffffffff80365db9>{tcp_rcv_established+2137} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8036ccdf>{tcp_v4_do_rcv+63} 
<ffffffff80157550>{autoremove_wake_function+0} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8032cf99>{release_sock+25} 
<ffffffff8035c893>{tcp_recvmsg+1875} 
Nov  9 14:25:22 euc126 kernel:        
<ffffffff8032ce13>{sock_common_recvmsg+51} 
<ffffffff8032a2ab>{sock_recvmsg+315} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8032a45a>{sock_sendmsg+282} 
<ffffffff80157550>{autoremove_wake_function+0} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff80246961>{comm_recv+209} 
<ffffffff80247d6d>{mig_do_send+1053} 
Nov  9 14:25:22 euc126 kernel:        
<ffffffff88008c73>{:tg3:tg3_start_xmit+1603} 
<ffffffff88008c73>{:tg3:tg3_start_xmit+1603} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8034607d>{qdisc_restart+45} 
<ffffffff803358e5>{dev_queue_xmit+613} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff80357ca7>{ip_finish_output+391} 
<ffffffff80355100>{dst_output+0} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff80355111>{dst_output+17} 
<ffffffff8033f673>{nf_hook_slow+195} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff80355100>{dst_output+0} 
<ffffffff8035759b>{ip_queue_xmit+1147} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff803ac36a>{thread_return+42} 
<ffffffff80330e07>{memcpy_toiovec+55} 
Nov  9 14:25:22 euc126 kernel:        
<ffffffff803312ef>{skb_copy_datagram_iovec+79} 
<ffffffff8036a879>{tcp_v4_send_check+169} 
Nov  9 14:25:22 euc126 kernel:        
<ffffffff80366c41>{tcp_transmit_skb+1665} 
<ffffffff80365d92>{tcp_rcv_established+2098} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8036ccdf>{tcp_v4_do_rcv+63} 
<ffffffff80157550>{autoremove_wake_function+0} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8014ad15>{__mod_timer+309} 
<ffffffff8032cf99>{release_sock+25} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8035c893>{tcp_recvmsg+1875} 
<ffffffff8032ce13>{sock_common_recvmsg+51} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8032a2ab>{sock_recvmsg+315} 
<ffffffff8010d04a>{__switch_to+314} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8032d118>{lock_sock+200} 
<ffffffff8032cf99>{release_sock+25} 
Nov  9 14:25:22 euc126 kernel:        
<ffffffff80157550>{autoremove_wake_function+0} 
<ffffffff80246961>{comm_recv+209} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff80247e27>{mig_send_hshake+87} 
<ffffffff8024807c>{task_move_to_node+252} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff802460e9>{task_request_move+41} 
<ffffffff80246295>{task_do_request+37} 
Nov  9 14:25:22 euc126 kernel:        
<ffffffff80249b48>{deputy_main_loop+1304} 
<ffffffff8016a018>{free_pages_bulk+728} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8016a180>{__pagevec_free+32} 
<ffffffff8016f6ae>{release_pages+382} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8016a018>{free_pages_bulk+728} 
<ffffffff8016a180>{__pagevec_free+32} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8016f6ae>{release_pages+382} 
<ffffffff8024d12b>{prio_tree_replace+59} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff801a22d1>{dput+33} 
<ffffffff80189bce>{__fput+254} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff80178155>{remove_vm_struct+133} 
<ffffffff8017831c>{exit_mmap+396} 
Nov  9 14:25:22 euc126 kernel:        <ffffffff8013d9f1>{mmput+49} 
<ffffffff80248088>{task_move_to_node+264} 
Nov  9 14:25:22 euc126 kernel:        
<ffffffff8024521a>{openmosix_pre_usermode+154} 
<ffffffff8010f65e>{retint_careful+45} 
Nov  9 14:25:22 euc126 kernel:        
Nov  9 14:25:22 euc126 kernel: 
Nov  9 14:25:22 euc126 kernel: Code: 48 83 b8 88 02 00 00 00 74 05 31 c0 0f 00 
d0 f3 c3 66 66 66 
Nov  9 14:25:22 euc126 kernel: RIP <ffffffff8024a087>{arch_mig_send_pre+7} RSP 
<ffff810090600df0>
Nov  9 14:25:22 euc126 kernel: CR2: 0000000000000288


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