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Date: Mon, 4 Jun 2012 21:35:21 +0200 From: Witold Baryluk <baryluk@....if.uj.edu.pl> To: Steven Rostedt <srostedt@...hat.com> Cc: "H.J. Lu" <hjl.tools@...il.com>, "H. Peter Anvin" <hpa@...or.com>, Al Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, linux-kernel@...r.kernel.org Subject: Failure(?) when testing trace event on UP kernel boot (INFO: suspicious RCU usage, when testing event rcu_something... ) Hello, I just rebuild by kernel with SMP disabled (This is 32-bit kernel compiled with gcc-4.7 running on Pentium-M CPU), and this is what I got [ 0.000000] Linux version 3.4.0-t43-devel-up-10118-g233e562-dirty (baryluk@...dniczarny) (gcc version 4.7.0 (Debian 4.7.0-11) ) #2 Mon Jun 4 14:17:10 CEST 2012 ... [ 18.535883] Running tests on trace events: ... [ 21.104950] Testing event rcu_utilization: OK [ 21.106136] [ 21.106196] =============================== [ 21.106259] [ INFO: suspicious RCU usage. ] [ 21.106325] 3.4.0-t43-devel-up-10118-g233e562-dirty #2 Not tainted [ 21.106394] ------------------------------- [ 21.106460] /sctank2/Dane/linux/linux-2.6/torvalds-linux-2.6/include/trace/events/rcu.h:275 suspicious rcu_dereference_check() usage! [ 21.106577] [ 21.106577] other info that might help us debug this: [ 21.106577] [ 21.106714] [ 21.106714] RCU used illegally from idle CPU! [ 21.106714] rcu_scheduler_active = 1, debug_locks = 1 [ 21.106858] RCU used illegally from extended quiescent state! [ 21.106927] no locks held by swapper/0. [ 21.106988] [ 21.106988] stack backtrace: [ 21.107085] Pid: 0, comm: swapper Not tainted 3.4.0-t43-devel-up-10118-g233e562-dirty #2 [ 21.107189] Call Trace: [ 21.107247] Testing event rcu_dyntick: [ 21.107319] [<c109908b>] lockdep_rcu_suspicious+0xcb/0xf0 [ 21.107395] [<c10d59a8>] rcu_idle_enter_common+0x248/0x3d0 [ 21.107469] [<c10d5c18>] ? rcu_idle_enter+0x28/0x100 [ 21.107541] [<c10d5c5a>] rcu_idle_enter+0x6a/0x100 [ 21.107615] [<c101c70a>] cpu_idle+0x5a/0x90 [ 21.107686] [<c175a1fe>] rest_init+0x126/0x138 [ 21.107756] [<c175a0d8>] ? reciprocal_value+0x48/0x48 [ 21.107829] [<c1c4b9a5>] start_kernel+0x31e/0x324 [ 21.107900] [<c1c4b4bc>] ? repair_env_string+0x51/0x51 [ 21.107972] [<c1c4b2d8>] i386_start_kernel+0x9b/0xa2 [ 21.113001] OK [ 21.120950] Testing event rcu_prep_idle: OK [ 21.128954] Testing event rcu_callback: OK [ 21.136951] Testing event rcu_kfree_callback: OK [ 21.144968] Testing event rcu_batch_start: OK [ 21.152961] Testing event rcu_invoke_callback: OK [ 21.160960] Testing event rcu_invoke_kfree_callback: OK [ 21.168965] Testing event rcu_batch_end: OK [ 21.176957] Testing event rcu_torture_read: OK sredniczarny:/boot# egrep 'SMP|LOCK|RCU|TRACE' /boot/config-`uname -r` CONFIG_LOCKDEP_SUPPORT=y CONFIG_STACKTRACE_SUPPORT=y # CONFIG_RWSEM_GENERIC_SPINLOCK is not set CONFIG_BROKEN_ON_SMP=y CONFIG_CLOCKSOURCE_WATCHDOG=y CONFIG_GENERIC_CLOCKEVENTS=y CONFIG_GENERIC_CLOCKEVENTS_BUILD=y CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST=y # RCU Subsystem CONFIG_TINY_RCU=y # CONFIG_PREEMPT_RCU is not set # CONFIG_TREE_RCU_TRACE is not set CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y CONFIG_TRACEPOINTS=y CONFIG_HAVE_ARCH_TRACEHOOK=y CONFIG_GENERIC_SMP_IDLE_THREAD=y CONFIG_BLOCK=y # CONFIG_INLINE_SPIN_TRYLOCK is not set # CONFIG_INLINE_SPIN_TRYLOCK_BH is not set # CONFIG_INLINE_SPIN_LOCK is not set # CONFIG_INLINE_SPIN_LOCK_BH is not set # CONFIG_INLINE_SPIN_LOCK_IRQ is not set # CONFIG_INLINE_SPIN_LOCK_IRQSAVE is not set CONFIG_UNINLINE_SPIN_UNLOCK=y # CONFIG_INLINE_SPIN_UNLOCK_BH is not set # CONFIG_INLINE_SPIN_UNLOCK_IRQ is not set # CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE is not set # CONFIG_INLINE_READ_TRYLOCK is not set # CONFIG_INLINE_READ_LOCK is not set # CONFIG_INLINE_READ_LOCK_BH is not set # CONFIG_INLINE_READ_LOCK_IRQ is not set # CONFIG_INLINE_READ_LOCK_IRQSAVE is not set # CONFIG_INLINE_READ_UNLOCK is not set # CONFIG_INLINE_READ_UNLOCK_BH is not set # CONFIG_INLINE_READ_UNLOCK_IRQ is not set # CONFIG_INLINE_READ_UNLOCK_IRQRESTORE is not set # CONFIG_INLINE_WRITE_TRYLOCK is not set # CONFIG_INLINE_WRITE_LOCK is not set # CONFIG_INLINE_WRITE_LOCK_BH is not set # CONFIG_INLINE_WRITE_LOCK_IRQ is not set # CONFIG_INLINE_WRITE_LOCK_IRQSAVE is not set # CONFIG_INLINE_WRITE_UNLOCK is not set # CONFIG_INLINE_WRITE_UNLOCK_BH is not set # CONFIG_INLINE_WRITE_UNLOCK_IRQ is not set # CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE is not set # CONFIG_SMP is not set # CONFIG_KVM_CLOCK is not set CONFIG_PARAVIRT_CLOCK=y CONFIG_HAVE_MEMBLOCK=y CONFIG_HAVE_MEMBLOCK_NODE_MAP=y CONFIG_ARCH_DISCARD_MEMBLOCK=y CONFIG_SPLIT_PTLOCK_CPUS=999999 CONFIG_PM_WAKELOCKS=y CONFIG_PM_WAKELOCKS_LIMIT=100 CONFIG_PM_WAKELOCKS_GC=y # CONFIG_X86_P4_CLOCKMOD is not set CONFIG_HAVE_TEXT_POKE_SMP=y CONFIG_NETFILTER_XT_TARGET_TRACE=m CONFIG_DM_DEBUG_BLOCK_STACK_TRACING=y CONFIG_TCM_IBLOCK=m # CONFIG_TRACE_SINK is not set # CONFIG_TELCLOCK is not set CONFIG_I8253_LOCK=y CONFIG_FILE_LOCKING=y CONFIG_PNFS_BLOCK=m CONFIG_LOCKD=y CONFIG_LOCKD_V4=y CONFIG_TRACE_IRQFLAGS_SUPPORT=y CONFIG_LOCKUP_DETECTOR=y CONFIG_HARDLOCKUP_DETECTOR=y CONFIG_BOOTPARAM_HARDLOCKUP_PANIC=y CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE=1 CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC=y CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=1 CONFIG_DEBUG_OBJECTS_RCU_HEAD=y CONFIG_DEBUG_SPINLOCK=y CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y CONFIG_PROVE_RCU=y CONFIG_PROVE_RCU_REPEATEDLY=y CONFIG_SPARSE_RCU_POINTER=y CONFIG_LOCKDEP=y CONFIG_LOCK_STAT=y CONFIG_DEBUG_LOCKDEP=y CONFIG_TRACE_IRQFLAGS=y CONFIG_DEBUG_LOCKING_API_SELFTESTS=y CONFIG_STACKTRACE=y CONFIG_RCU_TORTURE_TEST=m CONFIG_RCU_TRACE=y CONFIG_BACKTRACE_SELF_TEST=y CONFIG_DEBUG_BLOCK_EXT_DEVT=y CONFIG_USER_STACKTRACE_SUPPORT=y CONFIG_NOP_TRACER=y CONFIG_HAVE_FUNCTION_TRACER=y CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y CONFIG_HAVE_DYNAMIC_FTRACE=y CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y CONFIG_HAVE_SYSCALL_TRACEPOINTS=y CONFIG_TRACER_MAX_TRACE=y CONFIG_CONTEXT_SWITCH_TRACER=y CONFIG_GENERIC_TRACER=y CONFIG_FTRACE=y CONFIG_FUNCTION_TRACER=y CONFIG_FUNCTION_GRAPH_TRACER=y CONFIG_IRQSOFF_TRACER=y CONFIG_SCHED_TRACER=y CONFIG_FTRACE_SYSCALLS=y CONFIG_STACK_TRACER=y CONFIG_BLK_DEV_IO_TRACE=y CONFIG_DYNAMIC_FTRACE=y CONFIG_FTRACE_MCOUNT_RECORD=y CONFIG_FTRACE_SELFTEST=y CONFIG_FTRACE_STARTUP_TEST=y CONFIG_EVENT_TRACE_TEST_SYSCALLS=y # CONFIG_MMIOTRACE is not set CONFIG_HAVE_MMIOTRACE_SUPPORT=y CONFIG_XOR_BLOCKS=m sredniczarny:/var/log# egrep 'EVENT' /boot/config-`uname -r` CONFIG_GENERIC_CLOCKEVENTS=y CONFIG_GENERIC_CLOCKEVENTS_BUILD=y CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST=y CONFIG_EVENTFD=y CONFIG_HAVE_PERF_EVENTS=y CONFIG_PERF_EVENTS=y CONFIG_VM_EVENT_COUNTERS=y CONFIG_OPROFILE_EVENT_MULTIPLEX=y CONFIG_HAVE_PERF_EVENTS_NMI=y # CONFIG_ACPI_PROC_EVENT is not set CONFIG_NF_CONNTRACK_EVENTS=y CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug" # CONFIG_PREVENT_FIRMWARE_BUILD is not set CONFIG_PROC_EVENTS=y CONFIG_DM_UEVENT=y CONFIG_IPMI_PANIC_EVENT=y CONFIG_EVENT_TRACING=y # CONFIG_EVENT_POWER_TRACING_DEPRECATED is not set CONFIG_KPROBE_EVENT=y CONFIG_UPROBE_EVENT=y CONFIG_PROBE_EVENTS=y CONFIG_EVENT_TRACE_TEST_SYSCALLS=y This failure doesn't show up on same kernel but with SMP Jun 3 21:09:35 sredniczarny kernel: [ 62.892021] Testing event rcu_utilization: OK Jun 3 21:09:35 sredniczarny kernel: [ 62.916021] Testing event rcu_grace_period: OK Jun 3 21:09:35 sredniczarny kernel: [ 62.940021] Testing event rcu_grace_period_init: OK Jun 3 21:09:35 sredniczarny kernel: [ 62.964021] Testing event rcu_preempt_task: OK Jun 3 21:09:35 sredniczarny kernel: [ 62.988021] Testing event rcu_unlock_preempted_task: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.012021] Testing event rcu_quiescent_state_report: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.036021] Testing event rcu_fqs: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.060021] Testing event rcu_dyntick: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.084021] Testing event rcu_prep_idle: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.108021] Testing event rcu_callback: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.132021] Testing event rcu_kfree_callback: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.156021] Testing event rcu_batch_start: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.180021] Testing event rcu_invoke_callback: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.204021] Testing event rcu_invoke_kfree_callback: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.228021] Testing event rcu_batch_end: OK Jun 3 21:09:35 sredniczarny kernel: [ 63.252021] Testing event rcu_torture_read: OK Config diff: # diff -u0 /boot/config-3.4.0-t43-devel-up-10118-g233e562-dirty /boot/config-3.4.0-t43-devel-smp-10118-g233e562-dirty | egrep -v '^@' --- /boot/config-3.4.0-t43-devel-up-10118-g233e562-dirty 2012-06-04 14:35:08.000000000 +0200 +++ /boot/config-3.4.0-t43-devel-smp-10118-g233e562-dirty 2012-06-02 20:57:13.000000000 +0200 +CONFIG_HAVE_INTEL_TXT=y +CONFIG_X86_32_SMP=y +CONFIG_X86_HT=y +CONFIG_ARCH_CPU_PROBE_RELEASE=y -CONFIG_BROKEN_ON_SMP=y -CONFIG_LOCALVERSION="-t43-devel-up" +CONFIG_LOCALVERSION="-t43-devel-smp" +CONFIG_GENERIC_PENDING_IRQ=y +CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y -CONFIG_TINY_RCU=y +CONFIG_TREE_RCU=y -# CONFIG_TREE_RCU_TRACE is not set +CONFIG_RCU_FANOUT=32 +CONFIG_RCU_FANOUT_LEAF=16 +# CONFIG_RCU_FANOUT_EXACT is not set +# CONFIG_RCU_FAST_NO_HZ is not set +CONFIG_TREE_RCU_TRACE=y +CONFIG_USE_GENERIC_SMP_HELPERS=y +CONFIG_STOP_MACHINE=y -# CONFIG_SMP is not set +CONFIG_SMP=y +CONFIG_X86_MPPARSE=y +# CONFIG_X86_BIGSMP is not set -# CONFIG_XEN_PRIVILEGED_GUEST is not set +CONFIG_XEN_DOM0=y +CONFIG_XEN_PRIVILEGED_GUEST=y +CONFIG_XEN_PVHVM=y +CONFIG_PARAVIRT_SPINLOCKS=y -CONFIG_NR_CPUS=1 +CONFIG_NR_CPUS=2 +# CONFIG_SCHED_SMT is not set +# CONFIG_SCHED_MC is not set -# CONFIG_X86_UP_APIC is not set +CONFIG_X86_LOCAL_APIC=y +CONFIG_X86_IO_APIC=y +# CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS is not set +CONFIG_X86_MCE_INTEL=y +# CONFIG_X86_MCE_AMD is not set +CONFIG_X86_MCE_THRESHOLD=y +CONFIG_X86_THERMAL_VECTOR=y -CONFIG_NEED_PER_CPU_KM=y +CONFIG_HOTPLUG_CPU=y +CONFIG_PM_SLEEP_SMP=y +CONFIG_ACPI_HOTPLUG_CPU=y -# CONFIG_ARCH_SUPPORTS_MSI is not set +CONFIG_ARCH_SUPPORTS_MSI=y +CONFIG_PCI_MSI=y +# CONFIG_HT_IRQ is not set +CONFIG_RPS=y +CONFIG_RFS_ACCEL=y +CONFIG_XPS=y +CONFIG_XEN_BLKDEV_BACKEND=m +# CONFIG_MULTICORE_RAID456 is not set +CONFIG_XEN_NETDEV_BACKEND=m -# CONFIG_I2C_ELEKTOR is not set +CONFIG_XEN_BACKEND=y +CONFIG_XEN_PCIDEV_BACKEND=m +CONFIG_IOMMU_API=y +CONFIG_DMAR_TABLE=y +CONFIG_INTEL_IOMMU=y +CONFIG_INTEL_IOMMU_DEFAULT_ON=y +CONFIG_INTEL_IOMMU_FLOPPY_WA=y +CONFIG_RCU_CPU_STALL_TIMEOUT=60 +CONFIG_RCU_CPU_STALL_INFO=y +# CONFIG_DEBUG_PER_CPU_MAPS is not set +# CONFIG_CPU_NOTIFIER_ERROR_INJECT is not set +CONFIG_DEBUG_NMI_SELFTEST=y +# CONFIG_INTEL_TXT is not set +# CONFIG_CRYPTO_PCRYPT is not set +CONFIG_CPU_RMAP=y Regards, Witek -- Witold Baryluk -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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