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Bug 236441 - [RHEL5 RT] BUG: time warp detected!
Summary: [RHEL5 RT] BUG: time warp detected!
Alias: None
Product: Red Hat Enterprise MRG
Classification: Red Hat
Component: realtime-kernel
Version: 1.0
Hardware: All
OS: Linux
Target Milestone: ---
: ---
Assignee: Thomas Gleixner
QA Contact:
URL: http://armstrong.rhts/cgi-bin/rhts/te...
Depends On:
TreeView+ depends on / blocked
Reported: 2007-04-14 01:25 UTC by Jeff Burke
Modified: 2014-07-25 04:57 UTC (History)
2 users (show)

Fixed In Version: -31
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2007-07-03 18:33:57 UTC
Target Upstream Version:

Attachments (Terms of Use)
/var/log/messages file (deleted)
2007-05-18 19:24 UTC, Jeff Burke
no flags Details

Description Jeff Burke 2007-04-14 01:25:48 UTC
Description of problem:
 On system while running the RHTS testsuite
/kernel/misc/autotest results in the following error: 
 BUG: time warp detected!
 prev > now, 1053bb44a957f108 > 1053bb44676070e6:
 = 1106739234 delta, on CPU#0

Version-Release number of selected component (if applicable):

How reproducible:
 50% of the time

Steps to Reproduce:
Here is a link to the kernel

Here is information on how to setup a local system to use the RHTS devel

You can down load the tests from here:

This test it written for the RHTS environment. So you can install the
RHTS devel package following the directions from here:
then install the test and do a make run.

Or if you do _not_ want to install the RHTS devel stuff comment out the
# Include a global make rules file
include /usr/share/rhts/lib/rhts-make.include
# Source the common test script helpers
. /usr/bin/

then do a make run.
Actual results:
<Apr/13 02:44 pm>BUG: time warp detected!
<Apr/13 02:44 pm>prev > now, 1053bb44a957f108 > 1053bb44676070e6:
<Apr/13 02:44 pm>= 1106739234 delta, on CPU#0
<Apr/13 02:44 pm> [<c04051b3>] dump_trace+0x63/0x1eb
<Apr/13 02:44 pm> [<c0405358>] show_trace_log_lvl+0x1d/0x3a
<Apr/13 02:44 pm> [<c0405987>] show_trace+0x12/0x14
<Apr/13 02:44 pm> [<c0405a1a>] dump_stack+0x16/0x18
<Apr/13 02:44 pm> [<c0432d73>] do_gettimeofday+0x159/0x18c
<Apr/13 02:44 pm> [<c042e093>] sys_gettimeofday+0x1d/0x58
<Apr/13 02:44 pm> [<c0404109>] syscall_call+0x7/0xb
<Apr/13 02:44 pm> [<b7ef97f2>] 0xb7ef97f2
<Apr/13 02:44 pm> =======================
<Apr/13 02:44 pm>---------------------------
<Apr/13 02:44 pm>| preempt count: 00000000 ]
<Apr/13 02:44 pm>| 0-level deep critical section nesting:
<Apr/13 02:44 pm>----------------------------------------

Expected results:
 Test should pass

Additional info:

Comment 1 Tim Burke 2007-05-18 15:42:12 UTC
Notes from internal con-call today:

- IBM Athlon based system, 500mb mem
- error when running a diversity of kernel stress tests - not exactly sure which
precise test induced it
- repeatable, every time on this one system
- QA took the system for a standard RHEL issue so we can't reproduce immediately.

Recommendation: Ask IBM if they are seeing this and if they have any ideas.

Comment 2 Jeff Burke 2007-05-18 16:04:20 UTC
********** System Information **********
Hostname                = ibm-alishan
Kernel Version          = 2.6.20-14.el5rt
Machine Hardware Name   = i686
Processor Type          = athlon
uname -a output         = Linux ibm-alishan 2.6.20-14.el5rt #1 SMP PREEMPT Fri
Apr 13 10:39:25 EDT 2007 i686 athlon i386 GNU/Linux
Swap Size               = 1023 MB
Mem Size                = 485 MB
Number of Processors    = 2
System Release          = Red Hat Enterprise Linux Server release 5 (Tikanga)
Command Line            = ro root=/dev/VolGroup00/LogVol00 console=ttyS0,115200
System NMI Interrupts   = NMI:          0          0 
********** LSPCI **********
00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev f3)
00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev f2)
00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
01:02.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit
Ethernet PCI Express (rev 21)
********** Modprob **********
alias eth0 tg3
alias scsi_hostadapter sata_nv
********** Module Information **********
Checking module information autofs4:
Checking module information hidp:
Bluetooth HIDP ver 1.1
Checking module information rfcomm:
Bluetooth RFCOMM ver 1.8
Checking module information l2cap:
Bluetooth L2CAP ver 2.8
Checking module information bluetooth:
Bluetooth Core ver 2.11
Checking module information sunrpc:
Checking module information ipv6:
IPv6 protocol stack for Linux
Checking module information cpufreq_ondemand:
'cpufreq_ondemand' - A dynamic cpufreq governor for Low Latency Frequency
Transition capable processors
Checking module information video:
ACPI Video Driver
Checking module information sbs:
Smart Battery System ACPI interface driver
Checking module information i2c_ec:
ACPI EC SMBus driver
Checking module information dock:
ACPI Dock Station Driver
Checking module information button:
ACPI Button Driver
Checking module information battery:
ACPI Battery Driver
Checking module information asus_acpi:
Asus Laptop ACPI Extras Driver
Checking module information backlight:
Backlight Lowlevel Control Abstraction
Checking module information ac:
ACPI AC Adapter Driver
Checking module information lp:
Checking module information floppy:
Checking module information pata_amd:
low-level driver for AMD PATA IDE
Checking module information sg:
SCSI generic (sg) driver
Checking module information cfi_cmdset_0002:
MTD chip driver for AMD/Fujitsu flash chips
Checking module information cfi_util:
Checking module information mtdpart:
Generic support for partitioning of MTD devices
Checking module information parport_pc:
PC-style parallel port driver
Checking module information parport:
Checking module information jedec_probe:
Probe code for JEDEC-compliant flash chips
Checking module information cfi_probe:
Probe code for CFI-compliant flash chips
Checking module information k8temp:
AMD K8 core temperature monitor
Checking module information gen_probe:
Helper routines for flash chip probe code
Checking module information hwmon:
hardware monitoring sysfs/class support
Checking module information ck804xrom:
MTD map driver for BIOS chips on the Nvidia ck804 southbridge
Checking module information tg3:
Broadcom Tigon3 ethernet driver
Checking module information ide_cd:
Checking module information mtdcore:
Core MTD registration and access routines
Checking module information pcspkr:
PC Speaker beeper driver
Checking module information i2c_nforce2:
nForce2/3/4/5xx SMBus driver
Checking module information chipreg:
Core routines for registering and invoking MTD chip drivers
Checking module information cdrom:
Checking module information i2c_core:
I2C-Bus main module
Checking module information serio_raw:
Raw serio driver
Checking module information dm_snapshot:
device-mapper snapshot target
Checking module information dm_zero:
device-mapper dummy target returning zeros
Checking module information dm_mirror:
device-mapper mirror target
Checking module information dm_mod:
device-mapper driver
Checking module information ata_generic:
low-level driver for generic ATA
Checking module information sata_nv:
low-level driver for NVIDIA nForce SATA controller
Checking module information libata:
Library module for ATA devices
Checking module information sd_mod:
SCSI disk (sd) driver
Checking module information scsi_mod:
SCSI core
Checking module information ext3:
Second Extended Filesystem with journaling extensions
Checking module information jbd:
Checking module information ehci_hcd:
10 Dec 2004 USB 2.0 'Enhanced' Host Controller (EHCI) Driver
Checking module information ohci_hcd:
2006 August 04 USB 1.1 'Open' Host Controller (OHCI) Driver
Checking module information uhci_hcd:
USB Universal Host Controller Interface driver

Comment 3 john stultz 2007-05-18 18:48:37 UTC
I know Ingo had a variant of the paranoid timekeeping check included for awhile.
Although I've not been convinced that it didn't throw false positives. 

Few questions: 
1) What type of IBM system is this?
2) Can it be reproduced w/ the current RHEL5-rt kernel?
3) Can you attach dmesg output on the box?

Comment 4 Jeff Burke 2007-05-18 19:23:35 UTC
Few questions: 
1) What type of IBM system is this?
    	IBM eServer x3105 -[434774Z]-
2) Can it be reproduced w/ the current RHEL5-rt kernel?
        System is currently in use by QE for RHEL3-U9 testing. I was hoping that
IBM could try and reproduce it on similar hardware. Once that hardware becomes
available again I will try it.
3) Can you attach dmesg output on the box?
        I don't have a dmesg output I have the /var/log/messages from that
failure. I will attach it to the BZ.

Comment 5 Jeff Burke 2007-05-18 19:24:09 UTC
Created attachment 155026 [details]
/var/log/messages file

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