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    SubjectRe: 2.6.19-rc1-mm1
    Hi,

    On 10/10/06, Andrew Morton <akpm@osdl.org> wrote:
    >
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.19-rc1/2.6.19-rc1-mm1/
    >

    Kernel 2.6.19-rc1-mm1 + Neil's avoid_lockdep_warning_in_md.patch
    (http://www.ussg.iu.edu/hypermail/linux/kernel/0610.1/0642.html)

    (I'll try to reproduce this without Neil's patch).

    echo shutdown > /sys/power/disk; echo disk > /sys/power/state

    =======================================================
    [ INFO: possible circular locking dependency detected ]
    2.6.19-rc1-mm1 #4
    -------------------------------------------------------
    bash/2404 is trying to acquire lock:
    ((cpu_chain).rwsem){..--}, at: [<c012e6a0>]
    blocking_notifier_call_chain+0x11/0x2d

    but task is already holding lock:
    (workqueue_mutex){--..}, at: [<c0313dea>] mutex_lock+0x1c/0x1f

    which lock already depends on the new lock.

    the existing dependency chain (in reverse order) is:

    -> #1 (workqueue_mutex){--..}:
    [<c013a4d0>] add_lock_to_list+0x5c/0x7a
    [<c013c5f5>] __lock_acquire+0x9f3/0xaef
    [<c013ca5b>] lock_acquire+0x71/0x91
    [<c0313baf>] __mutex_lock_slowpath+0xd2/0x2f1
    [<c0313dea>] mutex_lock+0x1c/0x1f
    [<c0131767>] workqueue_cpu_callback+0x109/0x1ff
    [<c012e30f>] notifier_call_chain+0x20/0x31
    [<c012e6ac>] blocking_notifier_call_chain+0x1d/0x2d
    [<c014126b>] _cpu_down+0x48/0x1ff
    [<c01415fc>] disable_nonboot_cpus+0x9b/0x12f
    [<c0146bd3>] prepare_processes+0xf/0x73
    [<c0146e78>] pm_suspend_disk+0xa/0x11c
    [<c01460d4>] enter_state+0x5a/0x185
    [<c0146285>] state_store+0x86/0x9c
    [<c01ad6dc>] subsys_attr_store+0x20/0x25
    [<c01ad7df>] sysfs_write_file+0xaa/0xd3
    [<c0177189>] vfs_write+0xcd/0x179
    [<c0177834>] sys_write+0x3b/0x71
    [<c0103241>] sysenter_past_esp+0x56/0x8d
    [<ffffffff>] 0xffffffff

    -> #0 ((cpu_chain).rwsem){..--}:
    [<c013bbce>] print_circular_bug_tail+0x30/0x64
    [<c013c52c>] __lock_acquire+0x92a/0xaef
    [<c013ca5b>] lock_acquire+0x71/0x91
    [<c0138202>] down_read+0x28/0x3c
    [<c012e6a0>] blocking_notifier_call_chain+0x11/0x2d
    [<c014138b>] _cpu_down+0x168/0x1ff
    [<c01415fc>] disable_nonboot_cpus+0x9b/0x12f
    [<c0146bd3>] prepare_processes+0xf/0x73
    [<c0146e78>] pm_suspend_disk+0xa/0x11c
    [<c01460d4>] enter_state+0x5a/0x185
    [<c0146285>] state_store+0x86/0x9c
    [<c01ad6dc>] subsys_attr_store+0x20/0x25
    [<c01ad7df>] sysfs_write_file+0xaa/0xd3
    [<c0177189>] vfs_write+0xcd/0x179
    [<c0177834>] sys_write+0x3b/0x71
    [<c0103241>] sysenter_past_esp+0x56/0x8d
    [<ffffffff>] 0xffffffff

    other info that might help us debug this:

    2 locks held by bash/2404:
    #0: (cpu_add_remove_lock){--..}, at: [<c0313dea>] mutex_lock+0x1c/0x1f
    #1: (workqueue_mutex){--..}, at: [<c0313dea>] mutex_lock+0x1c/0x1f

    stack backtrace:
    [<c01042e6>] dump_trace+0x64/0x1cd
    [<c0104461>] show_trace_log_lvl+0x12/0x25
    [<c0104a08>] show_trace+0xd/0x10
    [<c0104a4f>] dump_stack+0x19/0x1b
    [<c013bbf7>] print_circular_bug_tail+0x59/0x64
    [<c013c52c>] __lock_acquire+0x92a/0xaef
    [<c013ca5b>] lock_acquire+0x71/0x91
    [<c0138202>] down_read+0x28/0x3c
    [<c012e6a0>] blocking_notifier_call_chain+0x11/0x2d
    [<c014138b>] _cpu_down+0x168/0x1ff
    [<c01415fc>] disable_nonboot_cpus+0x9b/0x12f
    [<c0146bd3>] prepare_processes+0xf/0x73
    [<c0146e78>] pm_suspend_disk+0xa/0x11c
    [<c01460d4>] enter_state+0x5a/0x185
    [<c0146285>] state_store+0x86/0x9c
    [<c01ad6dc>] subsys_attr_store+0x20/0x25
    [<c01ad7df>] sysfs_write_file+0xaa/0xd3
    [<c0177189>] vfs_write+0xcd/0x179
    [<c0177834>] sys_write+0x3b/0x71
    [<c0103241>] sysenter_past_esp+0x56/0x8d
    DWARF2 unwinder stuck at sysenter_past_esp+0x56/0x8d
    Leftover inexact backtrace:
    =======================

    config & dmesg http://www.stardust.webpages.pl/files/tbf/euridica/2.6.19-rc1-mm1/

    Regards,
    Michal

    --
    Michal K. K. Piotrowski
    LTG - Linux Testers Group
    (http://www.stardust.webpages.pl/ltg/)
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