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    Subject2.6.23-rc6-mm1: IPC: sleeping function called ...
    I'm getting tons of this, and X fails to start

    CONFIG_SYSVIPC=y
    CONFIG_SYSVIPC_SYSCTL=y
    # CONFIG_PREEMPT_NONE is not set
    # CONFIG_PREEMPT_VOLUNTARY is not set
    CONFIG_PREEMPT=y
    CONFIG_PREEMPT_BKL=y
    CONFIG_DEBUG_PREEMPT=y

    BUG: sleeping function called from invalid context at kernel/rwsem.c:47
    in_atomic():1, irqs_disabled():0
    no locks held by X/5879.
    [<c012bcb1>] down_write+0x15/0x50
    [<c01b53af>] do_shmat+0x235/0x3a0
    [<c0106be2>] sys_ipc+0x146/0x263
    [<c0102892>] sysenter_past_esp+0xa7/0xb5
    [<c0102856>] sysenter_past_esp+0x6b/0xb5
    =======================
    BUG: scheduling while atomic: X/5879/0x00000005
    no locks held by X/5879.
    irq event stamp: 401318
    hardirqs last enabled at (401317): [<c02d96c8>] __mutex_unlock_slowpath+0xb4/0x170
    hardirqs last disabled at (401318): [<c010286f>] sysenter_past_esp+0x84/0xb5
    softirqs last enabled at (397628): [<c01051ce>] do_softirq+0xa6/0xf9
    softirqs last disabled at (397585): [<c01051ce>] do_softirq+0xa6/0xf9
    [<c02d86fe>] __sched_text_start+0x2de/0x384
    [<c0106bf7>] sys_ipc+0x15b/0x263
    [<c01029ae>] work_resched+0x5/0x31
    =======================
    note: X[5879] exited with preempt_count 7
    BUG: scheduling while atomic: X/5879/0x10000008
    no locks held by X/5879.
    [<c02d86fe>] __sched_text_start+0x2de/0x384
    [<c0114ad5>] __cond_resched+0x21/0x3b
    [<c02d8c21>] cond_resched+0x2a/0x31
    [<c014c877>] unmap_vmas+0x518/0x560
    [<c014f5d6>] exit_mmap+0x6f/0x104
    [<c0115d41>] mmput+0x3b/0xbe
    [<c011ae16>] do_exit+0x142/0x870
    [<c01114cb>] do_page_fault+0x0/0x675
    [<c011b569>] do_group_exit+0x25/0x6b
    [<c01114cb>] do_page_fault+0x0/0x675
    [<c01221c5>] get_signal_to_deliver+0x286/0x439
    [<c0120e00>] force_sig_info+0x80/0x8a
    [<c01114cb>] do_page_fault+0x0/0x675
    [<c0101e0e>] do_notify_resume+0x79/0x6bc
    [<c015025a>] vma_link+0x97/0xd5
    [<c015025a>] vma_link+0x97/0xd5
    [<c0111754>] do_page_fault+0x289/0x675
    [<c0102892>] sysenter_past_esp+0xa7/0xb5
    [<c01114cb>] do_page_fault+0x0/0x675
    [<c01029ed>] work_notifysig+0x13/0x1a

    ...

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