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    SubjectRe: [ANNOUNCE] 2.6.33.1-rt11 - BUG?
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    On Thu, Apr 1, 2010 at 4:07 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
    > On Thu, 1 Apr 2010, Xianghua Xiao wrote:
    >
    > Can you please stop top posting ?
    >
    >> Here is the new dmesg output:
    >> BUG: sleeping function called from invalid context at kernel/rtmutex.c:684
    >> pcnt: 1 0 in_atomic(): 1, irqs_disabled(): 1, pid: 5770, name: insmod
    >> Call Trace:
    >> [ce935dc0] [c00096cc] show_stack+0x6c/0x1a4 (unreliable)
    >> [ce935df0] [c001f928] __might_sleep+0x104/0x108
    >> [ce935e00] [c03cb414] rt_spin_lock+0xa0/0xa4
    >> [ce935e10] [c00a4098] kmem_cache_alloc+0x50/0x17c
    >> [ce935e40] [c0073570] irq_to_desc_alloc_node+0x104/0x5ec
    >> [ce935e60] [c00064e0] irq_setup_virq+0x30/0xa8
    >> [ce935e80] [c000665c] irq_create_mapping+0x104/0x168
    >> [ce935ea0] [d1f69bc4] dma_init+0x118/0x1f0 [ipc]
    >> [ce935ee0] [d1f75018] ipc_init+0x18/0x140 [ipc]
    >> [ce935ef0] [c00038e0] do_one_initcall+0x54/0x210
    >> [ce935f20] [c005e424] sys_init_module+0x120/0x240
    >> [ce935f40] [c00139d4] ret_from_syscall+0x0/0x38
    >>
    >> I chased from ipc_init to irq_to_desc_alloc_node and found no
    >> interrupt-disabling.
    >>
    >> By looking at irq_to_desc_alloc_node (kernel/irq/handler.c) it has
    >> raw_spin_lock_irqsave(), with this raw spinlock irqsave I'm not sure
    >> if it causes trouble at kmem_cache_alloc after rt11 is applied, still
    >> checking on that.
    >
    > Can you please disabled CONFIG_SPARSE_IRQ ?
    >
    > Thanks,
    >
    >        tglx
    >
    After disabled CONFIG_SPARSE_IRQ the BUG output disappeared.
    Thanks a lot!
    Xianghua
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