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SubjectNew bug with 2.6.25-rt7
Hi,


I get the following traces time and again from 2.6.25-rt7. This did not
happen with -rt6.

BUG: scheduling with irqs disabled: IRQ-21/0x00000000/261
caller is rt_spin_lock_slowlock+0x1c7/0x2a0

[Frame pointers and stack unwinding enabled in .config]
Pid: 261, comm: IRQ-21 Tainted: G N 2.6.25.14-jen67-rt #1
Call Trace:
[<ffffffff8020e26c>] dump_trace+0x5ec/0x620
[<ffffffff8020e2f5>] show_trace+0x55/0x80
[<ffffffff804b69f8>] dump_stack+0x72/0x7b
[<ffffffff804b7d92>] schedule+0x102/0x110
[<ffffffff804b9047>] rt_spin_lock_slowlock+0x1c7/0x2a0
[<ffffffff804ba32d>] __rt_spin_lock+0x5d/0x60
[<ffffffff804ba339>] rt_spin_lock+0x9/0x10
[<ffffffff802c6ff2>] kmem_cache_free+0x42/0x80
[<ffffffff88165a89>] :uhci_hcd:uhci_free_urb_priv+0x79/0xd0
[<ffffffff88165b67>] :uhci_hcd:uhci_giveback_urb+0x87/0x240
[<ffffffff881661c5>] :uhci_hcd:uhci_scan_schedule+0x355/0xab0
[<ffffffff8816896a>] :uhci_hcd:uhci_irq+0x8a/0x190
[<ffffffff88136cda>] :usbcore:usb_hcd_irq+0x4a/0xa0
[<ffffffff8028db9d>] handle_IRQ_event+0x6d/0x130
[<ffffffff8028dfea>] thread_simple_irq+0x6a/0xd0
[<ffffffff8028e268>] do_irqd+0x218/0x380
[<ffffffff80258089>] kthread+0x49/0x90
[<ffffffff8020d698>] child_rip+0xa/0x12


CPU0 CPU1
0: 362 0 IO-APIC-edge timer
1: 2 0 IO-APIC-edge i8042
4: 5 0 IO-APIC-edge
6: 30 0 IO-APIC-edge floppy
7: 0 0 IO-APIC-edge parport0
8: 15570502 0 IO-APIC-edge rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 4 0 IO-APIC-edge i8042
14: 228042 0 IO-APIC-edge ata_piix
15: 0 0 IO-APIC-edge ata_piix
16: 940164 0 IO-APIC-fasteoi HDA Intel
18: 3 0 IO-APIC-fasteoi uhci_hcd:usb4, ohci1394
21: 297215 0 IO-APIC-fasteoi uhci_hcd:usb1, ehci_hcd:usb2
22: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
23: 0 0 IO-APIC-fasteoi uhci_hcd:usb5
4346: 950261 0 PCI-MSI-edge eth0
4347: 229217 0 PCI-MSI-edge ahci
NMI: 0 0 Non-maskable interrupts
LOC: 11474137 11575655 Local timer interrupts
RES: 371031 1059205 Rescheduling interrupts
CAL: 1070281 1087689 function call interrupts
TLB: 29799 22201 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
SPU: 0 0 Spurious interrupts
ERR: 0

# lsusb -t
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/8p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
|__ Port 1: Dev 2, If 0, Class=HID, Driver=usbhid, 1.5M
|__ Port 2: Dev 3, If 0, Class=HID, Driver=usbhid, 1.5M


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