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My server is running Linux kernel 2.6.18-194.el5PAE.

And find the following messages sometimes.

Any suggestion, what could be the reason?

Thanks a lot.


task java:8028 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
java          D 003A539D  2568  8028      1          8029  8027 (NOTLB)
   ecdf2c30 00000082 4715176d 003a539d f721e000 00000001 d3dc6ef0 0000000a 
   f5a0caa0 47165a50 003a539d 000142e3 00000000 f5a0cbac c3612f80 f5804e40 
   f721e180 f786dc80 00000000 00000000 d3dc6ef0 00000297 c3612fc4 ea071d74 
Call Trace:
[<c04364da>] prepare_to_wait_exclusive+0x27/0x49
[<c05b88d8>] lock_sock+0x67/0x96
[<c04363ff>] autoremove_wake_function+0x0/0x2d
[<c05f7118>] udp_sendmsg+0x71/0x52c
[<c05e7c00>] tcp_cong_avoid+0x15/0x25
[<c05e9c17>] tcp_ack+0x158a/0x16b5
[<c042da21>] lock_timer_base+0x15/0x2f
[<c042db95>] __mod_timer+0xda/0xe4
[<f8af783b>] udpv6_sendmsg+0x15b/0x822 [ipv6]
[<c04efcf1>] copy_to_user+0x31/0x48
[<c05bcfea>] memcpy_toiovec+0x27/0x4a
[<c05bd60e>] skb_copy_datagram_iovec+0x53/0x1ca
[<c061d24f>] _spin_lock_bh+0x8/0x18
[<c04363ff>] autoremove_wake_function+0x0/0x2d
[<c061d24f>] _spin_lock_bh+0x8/0x18
[<c05b87ec>] release_sock+0xc/0x91
[<c05e6839>] tcp_recvmsg+0x8f4/0x9fa
[<c05b82fb>] sock_common_recvmsg+0x2f/0x45
[<c05fcc98>] inet_sendmsg+0x35/0x3f
[<c05b6033>] sock_sendmsg+0xd3/0x11d
[<c061bad8>] schedule+0x9cc/0xa55
[<c04363ff>] autoremove_wake_function+0x0/0x2d
[<c04395d5>] futex_wake+0x3c/0xb0
[<c04efae5>] copy_from_user+0x31/0x5d
[<c05b735a>] sys_sendto+0x116/0x140
[<c061d24f>] _spin_lock_bh+0x8/0x18
[<c05b87ec>] release_sock+0xc/0x91
[<c05e4a5a>] tcp_ioctl+0xff/0x10a
[<c05e495b>] tcp_ioctl+0x0/0x10a
[<f8ae323f>] inet6_ioctl+0x87/0x8b [ipv6]
[<c05b648e>] sock_ioctl+0x191/0x1b3
[<c05b62fd>] sock_ioctl+0x0/0x1b3
[<c0484cc9>] do_ioctl+0x1c/0x5d
[<c05b7c7a>] sys_socketcall+0x106/0x19e
[<c0404f17>] syscall_call+0x7/0xb

=======================

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