I've had my up to date CentOS 6.4 server crash at least five times with the same basic bug report in /var/crash/*/vmcore-dmesg.txt:<br />
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<2>kernel BUG at drivers/char/n_tty.c:1713!<br />
<4>invalid opcode: 0000 [<a href="http://bugs.centos.org/view.php?id=1">0000001</a>] SMP<br />
<4>last sysfs file: /sys/devices/virtual/net/bond0/operstate<br />
<4>CPU 7<br />
<4>Modules linked in: mpt2sas scsi_transport_sas raid_class mptctl mptbase ipmi_devintf dell_rbu bonding 8021q garp stp llc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 ext3 jbd power_meter sg shpchp tg3 dcdbas microcode iTCO_wdt iTCO_vendor_support ioatdma dca ext4 mbcache jbd2 usb_storage sr_mod cdrom sd_mod crc_t10dif ahci megaraid_sas wmi dm_mirror dm_region_hash dm_log dm_mod [last unloaded: speedstep_lib]<br />
<4><br />
<4>Pid: 22024, comm: ssh Not tainted 2.6.32-358.14.1.el6.x86_64 <a href="http://bugs.centos.org/view.php?id=1">0000001</a> Dell Inc. PowerEdge R620/0PXXHP<br />
<4>RIP: 0010:[<ffffffff81329ac7>] [<ffffffff81329ac7>] n_tty_read+0x987/0x990<br />
<4>RSP: 0018:ffff880f6a7b1d88 EFLAGS: 00010246<br />
<4>RAX: ffff880162833540 RBX: ffff88017335b080 RCX: ffff8810156260d8<br />
<4>RDX: ffff8810156261c0 RSI: ffff88017335b080 RDI: ffff881015626000<br />
<4>RBP: ffff880f6a7b1e98 R08: ffffffff81323fd0 R09: 0101010101010101<br />
<4>R10: 0000000000000000 R11: 0000000000000246 R12: ffff881015626000<br />
<4>R13: ffff88037af7b7f8 R14: ffff881015626268 R15: ffff88101562651c<br />
<4>FS: 00007f3c7cb697c0(0000) GS:ffff8800618e0000(0000) knlGS:0000000000000000<br />
<4>CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br />
<4>CR2: 00007f4caa65c000 CR3: 0000000e2fd96000 CR4: 00000000000407e0<br />
<4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br />
<4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400<br />
<4>Process ssh (pid: 22024, threadinfo ffff880f6a7b0000, task ffff880162833540)<br />
<4>Stack:<br />
<4> 0000000000000000 0000000000000000 ffff8810156261c8 ffff880162833540<br />
<4><d> ffff8810156261c0 ffff881015626490 0000000000000000 ffff880162833540<br />
<4><d> ffff8810156260d8 0000000000000000 ffff880162833540 0000000100000001<br />
<4>Call Trace:<br />
<4> [<ffffffff81063330>] ? default_wake_function+0x0/0x20<br />
<4> [<ffffffff81324076>] tty_read+0xa6/0xf0<br />
<4> [<ffffffff81181845>] vfs_read+0xb5/0x1a0<br />
<4> [<ffffffff81181981>] sys_read+0x51/0x90<br />
<4> [<ffffffff81510e9e>] ? do_device_not_available+0xe/0x10<br />
<4> [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b<br />
<4>Code: 48 83 6d 88 01 e9 ca f9 ff ff 48 c7 85 38 ff ff ff 00 fe ff ff e9 ba f9 ff ff 48 c7 c7 d4 6e 7d 81 e8 6e 3c 1e 00 e9 88 f7 ff ff <0f> 0b eb fe 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54<br />
<1>RIP [<ffffffff81329ac7>] n_tty_read+0x987/0x990<br />
<4> RSP <ffff880f6a7b1d88><br />
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Runtimes between failures run the gamut of 2 days to 30 days. System is a brand new Dell R620 that has gone through two motherboard replacements, network daughter card replacement, both processors replaced.<br />
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Of the systems running CentOS 6.4 that I have, none of them perform the same duties as this one, and none of them (even the other four R620s) have crashed at all. Dell management event log reports a "watchdog timeout". There is no other logging or error information logged that I can find.
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