Hello, I already reported kernel 2.6.23-rcX warning about irq X : nobody cared, and it seemed to have been fixed in 2.6.23-rc6... Unfortunately, just rebooting with my 2.6.23-rc7, I got it appearing again, though the previous boot was just fine, and I didn't change/recompile my kernel in between. So, what changed ? I've compiled two modules : qc-usb-messenger, and hsf-modem, to make sure all my hardware is fully supported. And now, I have : .... scsi 3:0:1:0: Direct-Access ATA ST3500641AS 3.AA PQ: 0 ANSI: 5 sd 3:0:1:0: [sdd] 976773168 512-byte hardware sectors (500108 MB) sd 3:0:1:0: [sdd] Write Protect is off sd 3:0:1:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sd 3:0:1:0: [sdd] 976773168 512-byte hardware sectors (500108 MB) sd 3:0:1:0: [sdd] Write Protect is off sd 3:0:1:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA irq 23: nobody cared (try booting with the "irqpoll" option) Call Trace: <IRQ> [<ffffffff8105d21b>] __report_bad_irq+0x30/0x72 [<ffffffff8105d46c>] note_interrupt+0x20f/0x253 [<ffffffff8105dd38>] handle_fasteoi_irq+0xa9/0xd1 [<ffffffff8100ec65>] do_IRQ+0xf1/0x160 [<ffffffff8100b25b>] mwait_idle+0x0/0x45 [<ffffffff8100c431>] ret_from_intr+0x0/0xa <EOI> [<ffffffff8100b29d>] mwait_idle+0x42/0x45 [<ffffffff8100b1f3>] cpu_idle+0xbd/0xe0 [<ffffffff8175ca8e>] start_kernel+0x2bb/0x2c7 [<ffffffff8175c140>] _sinittext+0x140/0x144 handlers: [<ffffffff81307485>] (ata_interrupt+0x0/0x1d3) Disabling IRQ #23 sdd:<3>ata4.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen ata4.01: cmd c8/00:08:00:00:00/00:00:00:00:00/f0 tag 0 cdb 0x0 data 4096 in res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) ata4: soft resetting port ata4.01: qc timeout (cmd 0x27) ata4.01: ata_hpa_resize 1: hpa sectors (0) is smaller than sectors (976773168) ata4.00: failed to IDENTIFY (I/O error, err_mask=0x40) ata4: failed to recover some devices, retrying in 5 secs ata4: soft resetting port ata4.01: qc timeout (cmd 0x27) .... Booting with irqpoll is Ok, and I have : 2 [14:55] rol@donald:~> cat /proc/interrupts CPU0 CPU1 0: 31263 0 IO-APIC-edge timer 1: 201 0 IO-APIC-edge i8042 4: 219 0 IO-APIC-edge serial 6: 5 0 IO-APIC-edge floppy 8: 1 0 IO-APIC-edge rtc 9: 0 0 IO-APIC-fasteoi acpi 12: 129 1124 IO-APIC-edge i8042 14: 7010 1235 IO-APIC-edge libata 15: 0 0 IO-APIC-edge libata 17: 0 0 IO-APIC-fasteoi uhci_hcd:usb3 18: 0 0 IO-APIC-fasteoi uhci_hcd:usb4 19: 4250 0 IO-APIC-fasteoi uhci_hcd:usb5, HDA Intel 20: 1251 44 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2 21: 422 640 IO-APIC-fasteoi pata_pdc2027x, firewire_ohci 23: 24023 0 IO-APIC-fasteoi libata, hsfpcibasic2 378: 93 108 PCI-MSI-edge eth0 379: 1 0 PCI-MSI-edge eth1 NMI: 0 0 LOC: 31000 30803 ERR: 0 Hell, IRQ 23 is shared between libata and my modem !!! OK, just reboot, and see what happens.... Cool, now it is booting fine, no more complaint, even without irqpoll, IRQ 23 still shared... Another one, and Ok again... So, this looks really random :( Anything I could do to try to collect usefull traces ? Paul - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html