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SubjectRe: [2.6.18-rt7] BUG: time warp detected!
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Date
On Thu, 2006-10-26 at 07:20 +0000, Mike Galbraith wrote:
> $subject happened on my single P4/HT box sometime after resume from
> disk. Hohum activity: I had just read lkml and was retrieving latest
> glibc snapshot when I noticed the trace. I also noticed that the kernel
> decided to use pit instead of tsc.

Huh. Was the PIT selected before or after the resume from disk?

thanks
-john


> Linux version 2.6.18-rt7-smp (root@Homer) (gcc version 4.1.2 20060920 (prerelease) (SUSE Linux)) #184 SMP PREEMPT Sun Oct 22 05:57:53 Local time zone must be set
> BIOS-provided physical RAM map:
> BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
> BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
> BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
> BIOS-e820: 0000000000100000 - 000000003fff0000 (usable)
> BIOS-e820: 000000003fff0000 - 000000003fff3000 (ACPI NVS)
> BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data)
> BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
> 0MB HIGHMEM available.
> 1023MB LOWMEM available.
> found SMP MP-table at 000f5320
> On node 0 totalpages: 262128
> DMA zone: 4096 pages, LIFO batch:0
> Normal zone: 258032 pages, LIFO batch:31
> DMI 2.3 present.
> ACPI: RSDP (v000 IntelR ) @ 0x000f6cc0
> ACPI: RSDT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x3fff3000
> ACPI: FADT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x3fff3040
> ACPI: MADT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x3fff7200
> ACPI: DSDT (v001 INTELR AWRDACPI 0x00001000 MSFT 0x0100000e) @ 0x00000000
> ACPI: Local APIC address 0xfee00000
> ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
> Processor #0 15:2 APIC version 20
> ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
> Processor #1 15:2 APIC version 20
> ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
> ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
> ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
> IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
> ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
> ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
> ACPI: IRQ0 used by override.
> ACPI: IRQ2 used by override.
> ACPI: IRQ9 used by override.
> Enabling APIC mode: Flat. Using 1 I/O APICs
> Using ACPI (MADT) for SMP configuration information
> Allocating PCI resources starting at 50000000 (gap: 40000000:bec00000)
> Detected 2992.611 MHz processor.
> Real-Time Preemption Support (C) 2004-2006 Ingo Molnar
> Built 1 zonelists. Total pages: 262128
> Kernel command line: root=/dev/hdc3 vga=0x314 resume=/dev/hdc2 console=ttyS0,115200n8 console=tty profile=1
> kernel profiling enabled (shift: 1)
> mapped APIC to ffffd000 (fee00000)
> mapped IOAPIC to ffffc000 (fec00000)
> Enabling fast FPU save and restore... done.
> Enabling unmasked SIMD FPU exception support... done.
> Initializing CPU#0
> WARNING: experimental RCU implementation.
> Clock event device pit configured with caps set: 07
> CPU 0 irqstacks, hard=b15cd000 soft=b15c5000
> PID hash table entries: 4096 (order: 12, 16384 bytes)
> Console: colour dummy device 80x25
> Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
> Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> Memory: 1015040k/1048512k available (3773k kernel code, 33084k reserved, 1289k data, 240k init, 0k highmem)
> Checking if this processor honours the WP bit even in supervisor mode... Ok.
> Calibrating delay using timer specific routine.. 5986.97 BogoMIPS (lpj=2993488)
> Security Framework v1.0.0 initialized
> SELinux: Disabled at boot.
> Capability LSM initialized
> Mount-cache hash table entries: 512
> CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 00004400 00000000 00000000
> CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 00004400 00000000 00000000
> CPU: Trace cache: 12K uops, L1 D cache: 8K
> CPU: L2 cache: 512K
> CPU: Physical Processor ID: 0
> CPU: After all inits, caps: bfebfbff 00000000 00000000 00000080 00004400 00000000 00000000
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#0.
> CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
> CPU0: Thermal monitoring enabled
> Compat vDSO mapped to ffffe000.
> Checking 'hlt' instruction... OK.
> SMP alternatives: switching to UP code
> ACPI: Core revision 20060707
> CPU0: Intel(R) Pentium(R) 4 CPU 3.00GHz stepping 09
> SMP alternatives: switching to SMP code
> Booting processor 1/1 eip 3000
> CPU 1 irqstacks, hard=b15ce000 soft=b15c6000
> Initializing CPU#1
> Calibrating delay using timer specific routine.. 5984.19 BogoMIPS (lpj=2992096)
> CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 00004400 00000000 00000000
> CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 00004400 00000000 00000000
> CPU: Trace cache: 12K uops, L1 D cache: 8K
> CPU: L2 cache: 512K
> CPU: Physical Processor ID: 0
> CPU: After all inits, caps: bfebfbff 00000000 00000000 00000080 00004400 00000000 00000000
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#1.
> CPU1: Intel P4/Xeon Extended MCE MSRs (12) available
> CPU1: Thermal monitoring enabled
> CPU1: Intel(R) Pentium(R) 4 CPU 3.00GHz stepping 09
> Total of 2 processors activated (11971.16 BogoMIPS).
> ENABLING IO-APIC IRQs
> ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
> Clock event device pit new caps set: 01
> Clock event device lapic configured with caps set: 06
> checking TSC synchronization across 2 CPUs: passed.
> Clock event device pit new caps set: 01
> Clock event device lapic configured with caps set: 06
> Brought up 2 CPUs
> ...
> Starting balanced_irq
> Using IPI No-Shortcut mode
> Time: pit clocksource has been installed.
> ...
> BUG: time warp detected!
> prev > now, 101faf80ccb64133 > 101faf80ccb64132:
> = 1 delta, on CPU#0
> [<b10041fb>] show_trace_log_lvl+0x179/0x18f
> [<b10048bd>] show_trace+0x12/0x14
> [<b10049de>] dump_stack+0x19/0x1b
> [<b102c0cc>] do_gettimeofday+0x19e/0x1c7
> [<b12bacc5>] evdev_event+0xea/0x167
> [<b12b6f25>] input_event+0xc5/0x467
> [<b12b24f6>] hidinput_report_event+0x34/0x5e
> [<b12ad115>] hid_input_report+0x286/0x3a1
> [<b12ae791>] hid_irq_in+0x4b/0x118
> [<b1296800>] usb_hcd_giveback_urb+0x1a/0x4f
> [<b12a7077>] uhci_giveback_urb+0x80/0x171
> [<b12a77e0>] uhci_scan_schedule+0x57a/0x8cf
> [<b12a988b>] uhci_irq+0x6d/0x162
> [<b12973b6>] usb_hcd_irq+0x27/0x56
> [<b104f9d5>] handle_IRQ_event+0x5e/0xdb
> [<b104fef7>] thread_simple_irq+0x4b/0x85
> [<b10507d5>] do_irqd+0x2a9/0x314
> [<b1035f79>] kthread+0xe4/0xe8
> [<b1001005>] kernel_thread_helper+0x5/0xb
> DWARF2 unwinder stuck at kernel_thread_helper+0x5/0xb
> Leftover inexact backtrace:
> [<b10048bd>] show_trace+0x12/0x14
> [<b10049de>] dump_stack+0x19/0x1b
> [<b102c0cc>] do_gettimeofday+0x19e/0x1c7
> [<b12bacc5>] evdev_event+0xea/0x167
> [<b12b6f25>] input_event+0xc5/0x467
> [<b12b24f6>] hidinput_report_event+0x34/0x5e
> [<b12ad115>] hid_input_report+0x286/0x3a1
> [<b12ae791>] hid_irq_in+0x4b/0x118
> [<b1296800>] usb_hcd_giveback_urb+0x1a/0x4f
> [<b12a7077>] uhci_giveback_urb+0x80/0x171
> [<b12a77e0>] uhci_scan_schedule+0x57a/0x8cf
> [<b12a988b>] uhci_irq+0x6d/0x162
> [<b12973b6>] usb_hcd_irq+0x27/0x56
> [<b104f9d5>] handle_IRQ_event+0x5e/0xdb
> [<b104fef7>] thread_simple_irq+0x4b/0x85
> [<b10507d5>] do_irqd+0x2a9/0x314
> [<b1035f79>] kthread+0xe4/0xe8
> [<b1001005>] kernel_thread_helper+0x5/0xb
>
>

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