Messages in this thread | | | Date | Wed, 20 Oct 2010 17:14:50 -0700 | From | "Paul E. McKenney" <> | Subject | Re: Linux 2.6.36 |
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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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