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    SubjectRe: [git pull] scheduler fixes
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    From: Ingo Molnar <mingo@elte.hu>
    Date: Fri, 1 Aug 2008 11:01:00 +0200

    > I'm wondering, does this mean that Peter's:
    >
    > lockdep: change scheduler annotation
    >
    > is still not good enough yet?

    It doesn't work, the problem is this:

    [ 7819.764377] =============================================
    [ 7819.775495] [ INFO: possible recursive locking detected ]
    [ 7819.780969] 2.6.27-rc1-lockdep #12
    [ 7819.786256] ---------------------------------------------
    [ 7819.791548] cc1/29466 is trying to acquire lock:
    [ 7819.796685] (&rq->lock/1){.+..}, at: [<0000000000455548>] double_lock_balance+0x78/0x90
    [ 7819.806849]
    [ 7819.806859] but task is already holding lock:
    [ 7819.815871] (&rq->lock/1){.+..}, at: [<0000000000455538>] double_lock_balance+0x68/0x90
    [ 7819.825448]
    [ 7819.825456] other info that might help us debug this:
    [ 7819.834373] 1 lock held by cc1/29466:
    [ 7819.838709] #0: (&rq->lock/1){.+..}, at: [<0000000000455538>] double_lock_balance+0x68/0x90
    [ 7819.847818]
    [ 7819.847827] stack backtrace:
    [ 7819.855832] Call Trace:
    [ 7819.859696] [000000000047ecac] __lock_acquire+0xbdc/0xf98
    [ 7819.863669] [000000000047f7c4] lock_acquire+0x64/0x7c
    [ 7819.867613] [00000000006d67d4] _spin_lock_nested+0x1c/0x58
    [ 7819.871612] [0000000000455548] double_lock_balance+0x78/0x90
    [ 7819.875600] [00000000006d3afc] schedule+0x324/0x8d0
    [ 7819.879536] [00000000004c089c] pipe_wait+0x58/0x8c
    [ 7819.883462] [00000000004c0c94] pipe_write+0x3c4/0x480
    [ 7819.887597] [00000000004ba150] do_sync_write+0x80/0xd0
    [ 7819.891460] [00000000004ba92c] vfs_write+0x70/0x10c
    [ 7819.895264] [00000000004bad18] sys_write+0x2c/0x60
    [ 7819.899073] [0000000000406294] linux_sparc_syscall32+0x34/0x40


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