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    SubjectRe: suspend-related lockdep warning
    Date
    On Monday, 3 of December 2007, Andrew Morton wrote:
    > On Sun, 2 Dec 2007 21:33:23 +0100 "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
    >
    > > On Saturday, 1 of December 2007, Pavel Machek wrote:
    > > > Hi!
    > > >
    > > > > 2.6.24-rc3-mm2 (which will be released if it boots on two more machines and
    > > > > if I stay awake) will say this during suspend-to-RAM on the Vaio:
    > > > >
    > > > > [ 91.876445] Syncing filesystems ... done.
    > > > > [ 92.382595] Freezing user space processes ... WARNING: at kernel/lockdep.c:2662 check_flags()
    > > > > [ 92.384000] Pid: 1925, comm: dbus-daemon Not tainted 2.6.24-rc3-mm2 #32
    > > > > [ 92.384177] [<c0104a74>] show_trace_log_lvl+0x12/0x25
    > > > > [ 92.384335] [<c01052ff>] show_trace+0xd/0x10
    > > > > [ 92.384469] [<c01059be>] dump_stack+0x55/0x5d
    > > > > [ 92.384605] [<c0136a29>] check_flags+0x7f/0x11a
    > > > > [ 92.384746] [<c0139cfb>] lock_acquire+0x3a/0x86
    > > > > [ 92.384886] [<c031f4de>] _spin_lock+0x26/0x53
    > > > > [ 92.385023] [<c0141d3b>] refrigerator+0x13/0xc8
    > > > > [ 92.385163] [<c01274c8>] get_signal_to_deliver+0x32/0x3fb
    > > > > [ 92.385326] [<c01030f4>] do_notify_resume+0x8c/0x699
    > > > > [ 92.385476] [<c0103c18>] work_notifysig+0x13/0x1b
    > > > > [ 92.385620] =======================
    > > > > [ 92.385719] irq event stamp: 309
    > > > > [ 92.385809] hardirqs last enabled at (309): [<c0103c79>] syscall_exit_work+0x11/0x26
    > > > > [ 92.386045] hardirqs last disabled at (308): [<c0103b42>] syscall_exit+0x14/0x25
    > > > > [ 92.386265] softirqs last enabled at (0): [<c011bea5>] copy_process+0x374/0x130e
    > > > > [ 92.386491] softirqs last disabled at (0): [<00000000>] 0x0
    > > > > [ 92.392457] (elapsed 0.00 seconds) done.
    > > > > [ 92.392581] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
    > > > > [ 92.392882] PM: Entering mem sleep
    > > > > [ 92.392974] Suspending console(s)
    > > > >
    > > > > this has been happening for quite some time and might even be happening in
    > > > > mainline.
    > > >
    > > > Is it complaining that we entered refrigerator with irqs disabled?
    > >
    > > Or that someone else called task_lock() with irqs disabled at one point ...
    > >
    > > Hm, perhaps it's related to kernel preemption. Andrew, I guess the kernel is
    > > preemptible?
    > >
    >
    > yup. http://userweb.kernel.org/~akpm/config-sony.txt

    Is this reproducible with kernel preemption off?


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