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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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