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Date: Sun, 23 Jun 2013 12:19:59 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: fengguang.wu@...el.com, linux-kernel@...r.kernel.org
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Steven Rostedt <rostedt@...dmis.org>
Subject: [tracing/rcu] WARNING: at kernel/lockdep.c:3537 check_flags()
Greetings,
I find the below dmesg in upstream and linux-next.
[ 2.456884] Testing tracer branch:
[ 2.458281] ------------[ cut here ]------------
[ 2.459813] WARNING: at /c/kernel-tests/src/tip/kernel/lockdep.c:3537 check_flags+0xb7/0x1b0()
[ 2.460000] Hardware name: Bochs
[ 2.460000] Pid: 3, comm: ksoftirqd/0 Not tainted 3.9.0-rc4-03252-g8b473e1 #58
[ 2.460000] Call Trace:
[ 2.460000] [<ffffffff81073cdf>] warn_slowpath_common+0xaf/0xd0
[ 2.460000] [<ffffffff81073dda>] warn_slowpath_null+0x1a/0x20
[ 2.460000] [<ffffffff810e14f7>] check_flags+0xb7/0x1b0
[ 2.460000] [<ffffffff810e2682>] lock_is_held+0x62/0xc0
[ 2.460000] [<ffffffff810c938c>] __might_sleep+0x3c/0x3b0
[ 2.460000] [<ffffffff81082404>] run_ksoftirqd+0xd4/0x130
[ 2.460000] [<ffffffff810bec5c>] smpboot_thread_fn+0x25c/0x2e0
[ 2.460000] [<ffffffff810bea00>] ? lg_global_unlock+0x40/0x40
[ 2.460000] [<ffffffff810b210b>] kthread+0xfb/0x110
[ 2.460000] [<ffffffff810b2010>] ? insert_kthread_work+0x120/0x120
[ 2.460000] [<ffffffff81825c7a>] ret_from_fork+0x7a/0xb0
[ 2.460000] [<ffffffff810b2010>] ? insert_kthread_work+0x120/0x120
[ 2.460000] ---[ end trace 3af7e87d98c6254d ]---
Bisecting for "__might_sleep" and the first bad commit is
commit 965a002b4f1a458c5dcb334ec29f48a0046faa25
Author: Paul E. McKenney <paul.mckenney@...aro.org>
Date: Sat Jun 18 09:55:39 2011 -0700
rcu: Make TINY_RCU also use softirq for RCU_BOOST=n
This patch #ifdefs TINY_RCU kthreads out of the kernel unless RCU_BOOST=y,
thus eliminating context-switch overhead if RCU priority boosting has
not been configured.
Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
But note that its parent commit 385680a9487d2f85382ad6d74e2a15837e47bfd9
is not really clean and has this dmesg instead:
[ 2.592748] Testing tracer wakeup_rt: PASSED
[ 2.936495] Testing tracer branch:
[ 2.940281] ------------[ cut here ]------------
[ 2.941194] WARNING: at /c/wfg/mm/kernel/lockdep.c:3363 check_flags.part.31+0xaf/0x1c0()
[ 2.942593] Hardware name: Bochs
[ 2.943199] Pid: 0, comm: swapper Not tainted 3.1.0-rc8-00019-g385680a #99
[ 2.944234] Call Trace:
[ 2.944234] <IRQ> [<ffffffff81050b9e>] warn_slowpath_common+0x9e/0xd0
[ 2.944234] [<ffffffff81050caa>] warn_slowpath_null+0x1a/0x20
[ 2.944234] [<ffffffff8109fddf>] check_flags.part.31+0xaf/0x1c0
[ 2.944234] [<ffffffff810a49a9>] lock_acquire+0x119/0x230
[ 2.944234] [<ffffffff810657c7>] run_timer_softirq+0x217/0x8a0
[ 2.944234] [<ffffffff81065751>] ? run_timer_softirq+0x1a1/0x8a0
[ 2.944234] [<ffffffff810655a0>] ? ftrace_raw_output_itimer_expire+0x160/0x160
[ 2.944234] [<ffffffff8105c190>] __do_softirq+0x1c0/0x5c0
[ 2.944234] [<ffffffff815b8f7a>] call_softirq+0x1a/0x30
[ 2.944234] [<ffffffff81006465>] do_softirq+0x165/0x290
[ 2.944234] [<ffffffff8105c967>] irq_exit+0xb7/0x130
[ 2.944234] [<ffffffff810237d7>] smp_apic_timer_interrupt+0x77/0xb0
[ 2.944234] [<ffffffff815b8971>] apic_timer_interrupt+0x71/0x80
[ 2.944234] <EOI> [<ffffffff810e1e75>] ? ftrace_likely_update+0xc5/0x230
[ 2.944234] [<ffffffff810a045d>] ? trace_hardirqs_off+0xd/0x10
[ 2.944234] [<ffffffff8102bdab>] ? native_safe_halt+0xb/0x10
[ 2.944234] [<ffffffff8100f893>] default_idle+0x7d3/0x810
[ 2.944234] [<ffffffff8100131c>] cpu_idle+0x14c/0x160
[ 2.944234] [<ffffffff815922f3>] rest_init+0xe7/0xf4
[ 2.944234] [<ffffffff8159220c>] ? csum_partial_copy_generic+0x16c/0x16c
[ 2.944234] [<ffffffff81c33f15>] start_kernel+0x4f4/0x4ff
[ 2.944234] [<ffffffff81c33000>] ? vsyscall_gtod_data+0xf80/0xf80
[ 2.944234] [<ffffffff81c33000>] ? vsyscall_gtod_data+0xf80/0xf80
[ 2.944234] [<ffffffff81c33169>] x86_64_start_reservations+0x166/0x16a
[ 2.944234] [<ffffffff81c333dd>] x86_64_start_kernel+0x270/0x27f
[ 2.944234] ---[ end trace 6d450e935ee1897c ]---
[ 2.944234] possible reason: unannotated irqs-on.
[ 2.944234] irq event stamp: 10085
[ 2.944234] hardirqs last enabled at (10084): [<ffffffff815b6892>] _raw_spin_unlock_irq+0x32/0x80
[ 2.944234] hardirqs last disabled at (10085): [<ffffffff810e1e37>] ftrace_likely_update+0x87/0x230
[ 2.944234] softirqs last enabled at (10076): [<ffffffff8105c8a7>] irq_enter+0x87/0x90
[ 2.944234] softirqs last disabled at (10077): [<ffffffff815b8f7a>] call_softirq+0x1a/0x30
[ 3.040274] PASSED
[ 3.041998] HugeTLB registered 2 MB page size, pre-allocated 0 pages
git bisect start v3.2 v3.1 --
git bisect bad 68d99b2c8efcb6ed3807a55569300c53b5f88be5 # 10:10 0- Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect good efb8d21b2c6db3497655cc6a033ae8a9883e4063 # 10:18 27+ Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
git bisect bad 8686a0e200419322654a75155e2e6f80346a1297 # 10:22 0- Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 33bc95513c801b1637b6fb925155fb794b5da4f0 # 10:27 27+ staging: brcm80211: remove 'default n' from Kconfig
git bisect good 4d8daa6b77d0697ea19b9c4f704be9b26d76fb36 # 10:34 27+ staging: brcm80211: cleaned up struct brcms_bss_cfg
git bisect good 982653009b883ef1529089e3e6f1ae2fee41cbe2 # 10:38 27+ Merge branch 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 47724df3375bf0cf652039ab6b7ded29fe877de6 # 10:43 27+ Merge branch 'tip/perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/core
git bisect bad 048b718029033af117870d3da47da12995be14a3 # 10:52 0- Merge branch 'rcu/next' of git://github.com/paulmckrcu/linux into core/rcu
git bisect bad e5177ec77d503636d0b609671c9d408b981add17 # 10:56 0- rcu: Not necessary to pass rcu_read_lock_held() to rcu_dereference_protected()
git bisect good 8008e129dc90ff4f7a56cb033d6bd042afe3ed52 # 11:00 27+ rcu: Drive configuration directly from SMP and PREEMPT
git bisect good e0f23060adfa3f27beaa7918eff70258b88471b6 # 11:04 27+ rcu: Update comments to reflect softirqs vs. kthreads
git bisect bad 965a002b4f1a458c5dcb334ec29f48a0046faa25 # 11:10 0- rcu: Make TINY_RCU also use softirq for RCU_BOOST=n
git bisect good 385680a9487d2f85382ad6d74e2a15837e47bfd9 # 11:20 27+ rcu: Add event-trace markers to TREE_RCU kthreads
git bisect good 385680a9487d2f85382ad6d74e2a15837e47bfd9 # 11:24 81+ rcu: Add event-trace markers to TREE_RCU kthreads
git bisect bad 1d995963014cc2a847f9e18d972a9e845b5c27cd # 11:24 0- Merge remote-tracking branch 'stable/master'
git bisect bad 9e895ace5d82df8929b16f58e9f515f6d54ab82d # 11:24 0- Linux 3.10-rc7
git bisect bad e1a86578747376f08985627c84df088a5d0d1e92 # 11:27 9- Add linux-next specific files for 20130621
Thanks,
Fengguang
View attachment "dmesg-kvm-athens-47639-20130622083515-3.9.0-rc4-03252-g8b473e1-58" of type "text/plain" (80922 bytes)
View attachment "bisect-8b473e1a916c6f379e041de0e7efb4422c65f650-x86_64-randconfig-x07-0621-__might_sleep-49307.log" of type "text/plain" (32608 bytes)
View attachment ".config-bisect" of type "text/plain" (46603 bytes)
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