Description of problem:
Oct 10 00:12:39 gw kernel: BUG: soft lockup - CPU#1 stuck for 61s! [pluto:3398]
Oct 10 00:12:39 gw kernel: Modules linked in: authenc xfrm4_mode_tunnel deflate zlib_deflate ctr twofish twofish_common camellia serpent blowfish cbc xcbc crypto_null crypto_blkcipher xfrm4_tunnel tunnel4 esp4 aead ah4 aes_i586 aes_generic des_generic sha256_generic af_key w83627hf hwmon_vid hwmon ip6t_LOG ip6t_REJECT ip6table_mangle ip6table_filter ip6_tables nf_conntrack_ipv6 ipv6 ipt_recent ipt_LOG xt_limit xt_mac ipt_REJECT xt_owner xt_state xt_DSCP xt_tcpudp xt_MARK xt_CONNMARK ipt_MASQUERADE xt_policy iptable_mangle iptable_nat iptable_filter ip_tables x_tables nf_nat_tftp nf_nat_snmp_basic nf_nat_pptp nf_nat_proto_gre nf_nat_amanda nf_nat_irc nf_nat_h323 nf_nat_sip nf_nat_ftp nf_conntrack_tftp nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink nfnetlink nf_nat nf_conntrack_ipv4 nf_conntrack_netbios_ns ts_kmp nf_conntrack_amanda nf_conntrack_irc nf_conntrack_h323 nf_conntrack_sip nf_conntrack_ftp nf_conntrack dm_mirror dm_log dm_mod ppdev snd_intel8x0 snd_ac97_codec a
Oct 10 00:12:39 gw kernel: c97_bus parport_pc floppy parport snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm e1000 firewire_ohci firewire_core 8139cp crc_itu_t snd_timer snd 8139too mii soundcore serio_raw snd_page_alloc sr_mod pcspkr joydev cdrom i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support sg ata_generic pata_acpi ata_piix libata sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: scsi_wait_scan]
Oct 10 00:12:39 gw kernel:
Oct 10 00:12:39 gw kernel: Pid: 3398, comm: pluto Not tainted (2.6.26.5-45.fc9.i686 #1)
Oct 10 00:12:39 gw kernel: EIP: 0060:[<c0630d84>] EFLAGS: 00000202 CPU: 1
Oct 10 00:12:39 gw kernel: EIP is at _spin_lock+0x13/0x19
Oct 10 00:12:39 gw kernel: EAX: dc41d1ac EBX: dc41d1ac ECX: 00000054 EDX: 0000a7a8
Oct 10 00:12:39 gw kernel: ESI: dc68fa00 EDI: dc41d180 EBP: dfbf6cfc ESP: dfbf6cfc
Oct 10 00:12:39 gw kernel: DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Oct 10 00:12:39 gw kernel: CR0: 8005003b CR2: 08210b1c CR3: 1ee87000 CR4: 000006d0
Oct 10 00:12:39 gw kernel: DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
Oct 10 00:12:39 gw kernel: DR6: ffff0ff0 DR7: 00000400
Oct 10 00:12:39 gw kernel: [<c05f793f>] udp_queue_rcv_skb+0xd0/0x229
Oct 10 00:12:39 gw kernel: [<c05b8c49>] release_sock+0x3c/0x88
Oct 10 00:12:39 gw kernel: [<c05f8917>] udp_sendmsg+0x41e/0x4d2
Oct 10 00:12:39 gw kernel: [<c05fd250>] inet_sendmsg+0x3b/0x48
Oct 10 00:12:39 gw kernel: [<c05b7119>] sock_sendmsg+0xde/0xf9
Oct 10 00:12:39 gw kernel: [<c043964f>] ? autoremove_wake_function+0x0/0x33
Oct 10 00:12:39 gw kernel: [<c05b79ad>] sys_sendto+0xa4/0xc3
Oct 10 00:12:39 gw kernel: [<c04fb7eb>] ? copy_to_user+0x3b/0x10a
Oct 10 00:12:39 gw kernel: [<c05b80f4>] sys_socketcall+0xfb/0x187
Oct 10 00:12:39 gw kernel: [<c0404c32>] syscall_call+0x7/0xb
Oct 10 00:12:39 gw kernel: =======================


Version-Release number of selected component (if applicable):
kernel-2.6.26.5-45.fc9


How reproducible:


Steps to Reproduce:
1. Install lastest kernel 2.6.26.5-45.fc9 (latest Fedora 8 kernel 2.6.26.5 has also this bug).
2. Configure openswan.
3. You will get kernel crash with the above on the logs in several hours or days.
  
Actual results:
Kernel crashes on machines with openswan configured.

Expected results:
Kernel does not crash.

Additional info:
I am not sure, but it looks like the slower machines crashes more frequently.