Message-ID: <20110430173905.GA25641@tty.gr>
Date:	Sat, 30 Apr 2011 20:39:05 +0300
From:	Faidon Liambotis <paravoid@...ian.org>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>,
	seto.hidetoshi@...fujitsu.com,
	Hervé Commowick <hcommowick@...sec.fr>,
	Willy Tarreau <w@....eu>, Randy Dunlap <rdunlap@...otime.net>,
	Greg KH <greg@...ah.com>, Ben Hutchings <ben@...adent.org.uk>,
	Apollon Oikonomopoulos <apoikos@...il.com>
Subject: Re: 2.6.32.21 - uptime related crashes?

If I may add some, hopefully useful, information to the thread:

At work we have an HP c7000 blade enclosure. It's populated with 8 ProLiant
BL460c G1 (Xeon E5405, constant_tsc but not nonstop_tsc) and 4 ProLiant BL460c
G6 (Xeon E5504, constant_tsc + nonstop_tsc). All were booted at the same day
with Debian's 2.6.32-23~bpo50+1 kernel, i.e. upstream 2.6.32.21.

We too experienced problems with just the G6 blades at near 215 days 
uptime (on the 19th of April), all at the same time. From our 
investigation, it seems that their cpu_clocks jumped suddenly far in the 
future and then almost immediately rolled over due to wrapping around 
64-bits.

Although all of their (G6s) clocks wrapped around *at the same time*, only one
of them actually crashed at the time, with a second one crashing just a few
days later, on the 28th.

Three of them had the following on their logs:
Apr 18 20:56:07 hn-05 kernel: [17966378.581971] tap0: no IPv6 routers present
Apr 19 10:15:42 hn-05 kernel: [18446743935.365550] BUG: soft lockup - CPU#4 stuck for 17163091968s! [kvm:25913]
[...]
Apr 19 10:15:42 hn-05 kernel: [18446743935.447275]  [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b
Apr 19 10:18:32 hn-05 kernel: [   31.587025] bond0.13: received packet with own address as source address
(full oops at the end of this mail)

Note that the 17163091968s time stuck was *the same* (+/- 1s) in *all
three of them*.

What's also very strange, although we're not very sure if related, is
that when we took the first line of the above log entry and substracted
17966378.581971 from Apr 18 20:56:07, this resulted in a boot-time that
differed several hours from the actual boot time (the latter being
verified both with syslog and /proc/bstat's btime, which were both in
agreement). This was verified post-mortem too, with the date checked to
be correct.

IOW, we have some serious clock drift (calcuated it at runtime to
~0.1s/min) on these machines that hasn't been made apparent probably
since they all run NTP. Moreover, we also saw that drift on other
machines (1U, different vendor, different data center, E5520 CPUs) but
not with the G1 blades. Our investigation showed that the drift is there
constantly (it's not a one-time event) but we're not really sure if it's
related with the Apr 18th jump event.  Note that the drift is there even
if we boot with "clocksource=hpet" but disappears when booted with
"notsc". Also note that we've verified with 2.6.38 and the drift is
still there.

Regards,
Faidon

1: The full backtrace is:
Apr 18 20:56:07 hn-05 kernel: [17966378.581971] tap0: no IPv6 routers present
Apr 19 06:25:02 hn-05 kernel: imklog 3.18.6, log source = /proc/kmsg started.
Apr 19 10:15:42 hn-05 kernel: [18446743935.365550] BUG: soft lockup - CPU#4 stuck for 17163091968s! [kvm:25913]
Apr 19 10:15:42 hn-05 kernel: [18446743935.447056] Modules linked in: xt_pkttype ext2 tun kvm_intel kvm nf_conntrack_ipv6 ip6table_filter ip6_tables xt_tcpudp nf_conntrack_ipv4 nf_
defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables 8021q garp bridge stp bonding dm_round_robin dm_multipath scsi_dh ipmi_poweroff ipmi_devintf loop snd_pcm snd_ti
mer snd soundcore bnx2x psmouse snd_page_alloc serio_raw sd_mod crc_t10dif hpilo ipmi_si ipmi_msghandler container evdev crc32c pcspkr shpchp pci_hotplug libcrc32c power_meter mdio
 button processor ext3 jbd mbcache dm_mirror dm_region_hash dm_log dm_snapshot dm_mod usbhid hid cciss ehci_hcd uhci_hcd qla2xxx scsi_transport_fc usbcore nls_base tg3 libphy scsi_
tgt scsi_mod thermal fan thermal_sys [last unloaded: scsi_wait_scan]
Apr 19 10:15:42 hn-05 kernel: [18446743935.447111] CPU 4:
Apr 19 10:15:42 hn-05 kernel: [18446743935.447112] Modules linked in: xt_pkttype ext2 tun kvm_intel kvm nf_conntrack_ipv6 ip6table_filter ip6_tables xt_tcpudp nf_conntrack_ipv4 nf_
defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables 8021q garp bridge stp bonding dm_round_robin dm_multipath scsi_dh ipmi_poweroff ipmi_devintf loop snd_pcm snd_timer snd soundcore bnx2x psmouse snd_page_alloc serio_raw sd_mod crc_t10dif hpilo ipmi_si ipmi_msghandler container evdev crc32c pcspkr shpchp pci_hotplug libcrc32c power_meter mdio button processor ext3 jbd mbcache dm_mirror dm_region_hash dm_log dm_snapshot dm_mod usbhid hid cciss ehci_hcd uhci_hcd qla2xxx scsi_transport_fc usbcore nls_base tg3 libphy scsi_tgt scsi_mod thermal fan thermal_sys [last unloaded: scsi_wait_scan]
Apr 19 10:15:42 hn-05 kernel: [18446743935.447154] Pid: 25913, comm: kvm Not tainted 2.6.32-bpo.5-amd64 #1 ProLiant BL460c G6
Apr 19 10:15:42 hn-05 kernel: [18446743935.447157] RIP: 0010:[<ffffffffa02e209a>]  [<ffffffffa02e209a>] kvm_arch_vcpu_ioctl_run+0x785/0xa44 [kvm]
Apr 19 10:15:42 hn-05 kernel: [18446743935.447177] RSP: 0018:ffff88070065fd38  EFLAGS: 00000202
Apr 19 10:15:42 hn-05 kernel: [18446743935.447179] RAX: ffff88070065ffd8 RBX: ffff8804154ba860 RCX: ffff8804154ba860
Apr 19 10:15:42 hn-05 kernel: [18446743935.447182] RDX: ffff8804154ba8b9 RSI: ffff81004c818b10 RDI: ffff8100291a7d48
Apr 19 10:15:42 hn-05 kernel: [18446743935.447184] RBP: ffffffff8101166e R08: 0000000000000000 R09: 0000000000000000
Apr 19 10:15:42 hn-05 kernel: [18446743935.447187] R10: 00007f1b2a2af078 R11: ffffffff802f3405 R12: 0000000000000001
Apr 19 10:15:42 hn-05 kernel: [18446743935.447189] R13: 00000000154ba8b8 R14: ffff8804136ac000 R15: ffff8804154bbd48
Apr 19 10:15:42 hn-05 kernel: [18446743935.447192] FS:  0000000042cbb950(0000) GS:ffff88042e440000(0000) knlGS:0000000000000000
Apr 19 10:15:42 hn-05 kernel: [18446743935.447195] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
Apr 19 10:15:42 hn-05 kernel: [18446743935.447197] CR2: 0000000000000008 CR3: 0000000260c41000 CR4: 00000000000026e0
Apr 19 10:15:42 hn-05 kernel: [18446743935.447200] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Apr 19 10:15:42 hn-05 kernel: [18446743935.447202] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Apr 19 10:15:42 hn-05 kernel: [18446743935.447205] Call Trace:
Apr 19 10:15:42 hn-05 kernel: [18446743935.447215]  [<ffffffffa02e2004>] ? kvm_arch_vcpu_ioctl_run+0x6ef/0xa44 [kvm]
Apr 19 10:15:42 hn-05 kernel: [18446743935.447224]  [<ffffffff8100f79c>] ? __switch_to+0x285/0x297
Apr 19 10:15:42 hn-05 kernel: [18446743935.447231]  [<ffffffffa02d49d1>] ? kvm_vcpu_ioctl+0xf1/0x4e6 [kvm]
Apr 19 10:15:42 hn-05 kernel: [18446743935.447237]  [<ffffffff810240da>] ? lapic_next_event+0x18/0x1d
Apr 19 10:15:42 hn-05 kernel: [18446743935.447245]  [<ffffffff8106fb77>] ? tick_dev_program_event+0x2d/0x95
Apr 19 10:15:42 hn-05 kernel: [18446743935.447251]  [<ffffffff81047e29>] ? finish_task_switch+0x3a/0xaf
Apr 19 10:15:42 hn-05 kernel: [18446743935.447258]  [<ffffffff810f9f5a>] ? vfs_ioctl+0x21/0x6c
Apr 19 10:15:42 hn-05 kernel: [18446743935.447261]  [<ffffffff810fa4a8>] ? do_vfs_ioctl+0x48d/0x4cb
Apr 19 10:15:42 hn-05 kernel: [18446743935.447268]  [<ffffffff81063fcd>] ? sys_timer_settime+0x233/0x283
Apr 19 10:15:42 hn-05 kernel: [18446743935.447272]  [<ffffffff810fa537>] ? sys_ioctl+0x51/0x70
Apr 19 10:15:42 hn-05 kernel: [18446743935.447275]  [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b
Apr 19 10:18:32 hn-05 kernel: [   31.587025] bond0.13: received packet with own address as source address
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