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    SubjectRe: Linux 2.6.36
    On Thu, Oct 21, 2010 at 09:00:07AM +0900, Minchan Kim wrote:
    > On Thu, Oct 21, 2010 at 6:01 AM, Linus Torvalds
    > <torvalds@linux-foundation.org> wrote:

    [ . . . ]

    > I met "INFO: suspicious rcu_dereference_check() usage"
    > Maybe we need this patch http://lkml.org/lkml/2010/10/12/4

    Hello, Minchan,

    This commit is currently in -tip, and my guess is that Ingo will be
    sending it on to Linus during the merge window.

    In the meantime, I suggest that people run production 2.6.36 kernels
    with CONFIG_PROVE_RCU=n, which is the default. ;-)

    Thanx, Paul

    > ---
    >
    > <SNIP>
    >
    > Fast TSC calibration using PIT
    > Detected 2660.408 MHz processor.
    > Calibrating delay loop (skipped), value calculated using timer frequency.. 5320.
    > 81 BogoMIPS (lpj=10641632)
    > pid_max: default: 32768 minimum: 301
    > Security Framework initialized
    > SELinux: Disabled at boot.
    > Mount-cache hash table entries: 512
    > Initializing cgroup subsys ns
    > Initializing cgroup subsys cpuacct
    > Initializing cgroup subsys memory
    > Initializing cgroup subsys freezer
    > CPU: Physical Processor ID: 0
    > CPU: Processor Core ID: 0
    > using mwait in idle threads.
    > Performance Events: PEBS fmt0+, Core2 events, Intel PMU driver.
    > ... version: 2
    > ... bit width: 40
    > ... generic registers: 2
    > ... value mask: 000000ffffffffff
    > ... max period: 000000007fffffff
    > ... fixed-purpose events: 3
    > ... event mask: 0000000700000003
    > ACPI: Core revision 20100702
    > ftrace: converting mcount calls to 0f 1f 44 00 00
    > ftrace: allocating 21862 entries in 43 pages
    > Enabling APIC mode: Flat. Using 1 I/O APICs
    > ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
    > CPU0: Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz stepping 0a
    > lockdep: fixing up alternatives.
    >
    > ===================================================
    > [ INFO: suspicious rcu_dereference_check() usage. ]
    > ---------------------------------------------------
    > kernel/sched.c:618 invoked rcu_dereference_check() without protection!
    >
    > other info that might help us debug this:
    >
    >
    > rcu_scheduler_active = 1, debug_locks = 0
    > 3 locks held by kworker/0:0/4:
    > #0: (events){+.+.+.}, at: [<c015fc3e>] process_one_work+0x11e/0x470
    > #1: ((&c_idle.work)){+.+.+.}, at: [<c015fc3e>] process_one_work+0x11e/0x470
    > #2: (&rq->lock){-.....}, at: [<c066a042>] init_idle+0x29/0x111
    >
    > stack backtrace:
    > Pid: 4, comm: kworker/0:0 Not tainted 2.6.36 #44
    > Call Trace:
    > [<c066c9bd>] ? printk+0x1d/0x20
    > [<c017ad7a>] lockdep_rcu_dereference+0xaa/0xb0
    > [<c013ed8e>] set_task_rq+0x1ae/0x2d0
    > [<c066a0eb>] init_idle+0xd2/0x111
    > [<c066a4dd>] fork_idle+0xae/0xc1
    > [<c0668f48>] do_fork_idle+0x13/0x23
    > [<c015fcba>] process_one_work+0x19a/0x470
    > [<c015fc3e>] ? process_one_work+0x11e/0x470
    > [<c0668f35>] ? do_fork_idle+0x0/0x23
    > [<c0162069>] worker_thread+0x129/0x320
    > [<c0161f40>] ? worker_thread+0x0/0x320
    > [<c0165e1c>] kthread+0x7c/0x90
    > [<c0165da0>] ? kthread+0x0/0x90
    > [<c01034fa>] kernel_thread_helper+0x6/0x10
    > Booting Node 0, Processors #1
    > Initializing CPU#1
    > lockdep: fixing up alternatives.
    > #2
    > Initializing CPU#2
    > lockdep: fixing up alternatives.
    > #3 Ok.
    > Initializing CPU#3
    > Brought up 4 CPUs
    > Total of 4 processors activated (21280.57 BogoMIPS).
    > devtmpfs: initialized
    > regulator: core version 0.5
    > Time: 8:38:59 Date: 10/21/10
    > NET: Registered protocol family 16
    > EISA bus registered
    > ACPI: bus type pci registered
    > PCI: MMCONFIG for domain 0000 [bus 00-10] at [mem
    > 0xf8000000-0xf90fffff] (base 0xf8000000)
    > PCI: not using MMCONFIG
    > PCI: PCI BIOS revision 2.10 entry at 0xfdc00, last bus=17
    > PCI: Using configuration type 1 for base access
    > bio: create slab <bio-0> at 0
    > ACPI: EC: Look up EC in DSDT
    > ACPI: SSDT beb5efc5 001DD (v01 PmRef Cpu0Ist 00003000 INTL 20050228)
    > ACPI: Dynamic OEM Table Load:
    > ACPI: SSDT (null) 001DD (v01 PmRef Cpu0Ist 00003000 INTL 20050228)
    > ACPI: SSDT beb5f1a2 0016E (v01 PmRef Cpu1Ist 00003000 INTL 20050228)
    > ACPI: Dynamic OEM Table Load:
    > ACPI: SSDT (null) 0016E (v01 PmRef Cpu1Ist 00003000 INTL 20050228)
    > ACPI: SSDT beb5f310 0016E (v01 PmRef Cpu2Ist 00003000 INTL 20050228)
    > ACPI: Dynamic OEM Table Load:
    > ACPI: SSDT (null) 0016E (v01 PmRef Cpu2Ist 00003000 INTL 20050228)
    > ACPI: SSDT beb5f47e 0016E (v01 PmRef Cpu3Ist 00003000 INTL 20050228)
    > ACPI: Dynamic OEM Table Load:
    > ACPI: SSDT (null) 0016E (v01 PmRef Cpu3Ist 00003000 INTL 20050228)
    > ACPI: Interpreter enabled
    >
    > <SNIP>
    >
    > --
    >
    >
    >
    > --
    > Kind regards,
    > Minchan Kim


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