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    SubjectRe: 2.6.21-rc7-mm1 BUG at kernel/sched-clock.c:175 init_sched_clock()
    Andrew Morton wrote:
    >> [ 2.953862] RIP: 0010:[<ffffffff803ae98b>] [<ffffffff803ae98b>] scsi_schedule_eh+0xa/0x57
    >> [ 3.058672] [<ffffffff803e1e01>] ata_port_schedule_eh+0x4c/0x50
    >> [ 3.064725] [<ffffffff803e1ea7>] ata_port_abort+0xa2/0xae
    >> [ 3.070248] [<ffffffff803e1ef9>] ata_port_freeze+0x46/0x57
    >> [ 3.075853] [<ffffffff803e4c39>] ahci_interrupt+0x300/0x47a
    >> [ 3.081552] [<ffffffff8020eb83>] handle_IRQ_event+0x27/0x57
    >> [ 3.087253] [<ffffffff8029a021>] handle_edge_irq+0xee/0x133
    >> [ 3.092960] [<ffffffff8025f4e1>] do_IRQ+0x6d/0xd5
    >> [ 3.097793] [<ffffffff80255071>] ret_from_intr+0x0/0xa
    >> [ 3.103059] [<ffffffff8024e88b>] mwait_idle+0x46/0x4b
    >> [ 3.108231] [<ffffffff802422f4>] cpu_idle+0x87/0xaa
    >> [ 3.113227] [<ffffffff8025c988>] rest_init+0x49/0x4b
    >> [ 3.118322] [<ffffffff805dca5d>] start_kernel+0x291/0x29c
    >> [ 3.123837] [<ffffffff805dc13a>] _sinittext+0x13a/0x141
    >>
    >
    > So we took an AHCI interrupt when ata_port.scsi_host was still NULL.
    >
    > It appears that ATA is presently requesting its IRQ before allocating all
    > the resources which are needed to handle an interrupt. Does this
    > (resource-leaky) patch fix things?

    No, that would break host probing. The port is in frozen (controller
    initialized and IRQs masked off) state, so it's not allowed to take
    interrupt. If interrupt triggers at this point, it's low level driver
    bug. Berck, how reliably can you reproduce this problem? Can you post
    the result of 'lspci -nn'?

    --
    tejun
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