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    SubjectRe: [BUG] Strange 1-second pauses during Resume-from-RAM
    On Sat, 1 December 2007 21:54:56 +0100, Ingo Molnar wrote:
    > * J??rn Engel <joern@logfs.org> wrote:
    > >
    > > stopped custom tracer.
    > > BUG: spinlock recursion on CPU#0, sh/953
    > > lock: c030f280, .magic: dead4ead, .owner: sh/953, .owner_cpu: 0
    > > Pid: 953, comm: sh Not tainted 2.6.24-rc3-ge1cca7e8-dirty #2
    > > [<c0103a04>] show_trace_log_lvl+0x35/0x54
    > > [<c010450a>] show_trace+0x2c/0x2e
    > > [<c0104e6d>] dump_stack+0x84/0x8a
    > > [<c01ded7c>] spin_bug+0xa7/0xae
    > > [<c01def14>] _raw_spin_lock+0x45/0xfa
    > > [<c02a02b1>] _spin_lock_irqsave+0x68/0x7a
    > > [<c01087e7>] pit_read+0x14/0x99
    > > [<c0130ee9>] get_monotonic_cycles+0xf/0x2d
    >
    > ah. You should mark pit_read() function as notrace. PIT clocksource is
    > rare. (add the 'notrace' word to the function prototype)

    Hardly a change at all. Apart from some offsets, this dump is
    identical.

    stopped custom tracer.
    BUG: spinlock recursion on CPU#0, sh/954
    lock: c030f280, .magic: dead4ead, .owner: sh/954, .owner_cpu: 0
    Pid: 954, comm: sh Not tainted 2.6.24-rc3-ge1cca7e8-dirty #3
    [<c0103a04>] show_trace_log_lvl+0x35/0x54
    [<c010450a>] show_trace+0x2c/0x2e
    [<c0104e6d>] dump_stack+0x84/0x8a
    [<c01ded7c>] spin_bug+0xa7/0xae
    [<c01def14>] _raw_spin_lock+0x45/0xfa
    [<c02a02b1>] _spin_lock_irqsave+0x68/0x7a
    [<c01087e2>] pit_read+0xf/0x91
    [<c0130ee1>] get_monotonic_cycles+0xf/0x2d
    [<c013c0e7>] now+0x2a/0x7c
    [<c013c333>] ____trace+0x4d/0x1e8
    [<c013dbeb>] __mcount+0x95/0xa6
    [<c010d354>] mcount+0x14/0x18
    [<c0135a3c>] lock_acquired+0xe/0x1d7
    [<c02a02b9>] _spin_lock_irqsave+0x70/0x7a
    [<c01087e2>] pit_read+0xf/0x91
    [<c0130789>] update_wall_time+0x23/0x692
    [<c012174e>] do_timer+0x24/0xb1
    [<c01331f6>] tick_periodic+0x49/0x84
    [<c0133253>] tick_handle_periodic+0x22/0x73
    [<c0106315>] timer_interrupt+0x4f/0x56
    [<c013e2bf>] handle_IRQ_event+0x24/0x4f
    [<c013f442>] handle_edge_irq+0xb8/0x125
    [<c01054ee>] do_IRQ+0x89/0xa3
    [<c01033df>] common_interrupt+0x23/0x28
    [<c010d354>] mcount+0x14/0x18
    [<c0120130>] sysctl_head_finish+0xc/0x33
    [<c0192d64>] proc_sys_write+0x96/0xa0
    [<c015d91c>] vfs_write+0xa6/0x14c
    [<c015df66>] sys_write+0x4c/0x70
    [<c0102a1f>] syscall_call+0x7/0xb
    =======================

    Jörn

    --
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