From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com,
tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
eric.dumazet@gmail.com,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 25/48] rcu: fix debugobjects rcu head init on stack in rcutree_plugin.h
Date: Tue, 4 May 2010 13:19:35 -0700 [thread overview]
Message-ID: <1273004398-19760-25-git-send-email-paulmck@linux.vnet.ibm.com> (raw)
In-Reply-To: <20100504201934.GA19234@linux.vnet.ibm.com>
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Testing resulted in the following debugobjects splat
[...]
ODEBUG: object is on stack, but not annotated
------------[ cut here ]------------
Badness at lib/debugobjects.c:294
NIP: c0000000002c76f0 LR: c0000000002c76ec CTR: c00000000041ecd8
REGS: c0000001de71b280 TRAP: 0700 Tainted: G W (2.6.34-rc3-autokern1)
MSR: 8000000000029032 <EE,ME,CE,IR,DR> CR: 24000424 XER: 0000000f
TASK = c0000001de7dca00[3695] 'arping' THREAD: c0000001de718000 CPU: 1
GPR00: c0000000002c76ec c0000001de71b500 c00000000096c048 0000000000000034
GPR04: 0000000000000001 c000000000063918 0000000000000000 0000000000000002
GPR08: 0000000000000003 0000000000000000 c000000000086f68 c0000001de7dca00
GPR12: 000000000000256d c0000000074e4200 0000000000000000 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 00000000201b8f60
GPR20: 00000000201b8f70 00000000201b8f48 0000000000000000 c0000000008766b8
GPR24: c0000001de71b800 0000000000000001 c0000000008ad400 c000000001247478
GPR28: c0000000e6abb8c0 c0000000e6abb8c0 c000000000904570 c000000001247470
NIP [c0000000002c76f0] .__debug_object_init+0x314/0x40c
LR [c0000000002c76ec] .__debug_object_init+0x310/0x40c
Call Trace:
[c0000001de71b500] [c0000000002c76ec] .__debug_object_init+0x310/0x40c (unreliable)
[c0000001de71b5d0] [c00000000007d990] .rcuhead_fixup_activate+0x40/0xdc
[c0000001de71b660] [c0000000002c6a7c] .debug_object_fixup+0x4c/0x74
[c0000001de71b6f0] [c0000000000c5e54] .__call_rcu+0x3c/0x1d4
[c0000001de71b790] [c0000000000c6050] .synchronize_rcu+0x4c/0x6c
[c0000001de71b870] [c0000000004be218] .synchronize_net+0x10/0x24
[c0000001de71b8e0] [c0000000005498c8] .packet_release+0x1d4/0x274
[c0000001de71b990] [c0000000004ac1f0] .sock_release+0x54/0x124
[c0000001de71ba20] [c0000000004ac9e4] .sock_close+0x34/0x4c
[c0000001de71baa0] [c00000000012469c] .__fput+0x174/0x264
[c0000001de71bb40] [c000000000120c54] .filp_close+0xb0/0xd8
[c0000001de71bbd0] [c000000000065e70] .put_files_struct+0x1a8/0x314
[c0000001de71bc70] [c000000000067e04] .do_exit+0x234/0x6f0
[c0000001de71bd30] [c000000000068354] .do_group_exit+0x94/0xc8
[c0000001de71bdc0] [c00000000006839c] .SyS_exit_group+0x14/0x28
[c0000001de71be30] [c000000000008554] syscall_exit+0x0/0x40
Instruction dump:
7f80b000 419e0030 2fa00000 e93e8140 380b0001 90090000 419e000c e87e8148
48000008 e87e8150 4bd9cb89 60000000 <0fe00000> 801c0010 2f800003 419e0024
The fix is to add init_rcu_head_on_stack() and destroy_rcu_head_on_stack()
to the TREE_PREEMPT_RCU implementation of synchronize_rcu().
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/rcutree_plugin.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 0ae2339..5c599e8 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -557,11 +557,13 @@ void synchronize_rcu(void)
if (!rcu_scheduler_active)
return;
+ init_rcu_head_on_stack(&rcu.head);
init_completion(&rcu.completion);
/* Will wake me after RCU finished. */
call_rcu(&rcu.head, wakeme_after_rcu);
/* Wait for it. */
wait_for_completion(&rcu.completion);
+ destroy_rcu_head_on_stack(&rcu.head);
}
EXPORT_SYMBOL_GPL(synchronize_rcu);
--
1.7.0
next prev parent reply other threads:[~2010-05-04 20:24 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-04 20:19 [PATCH tip/core/rcu 0/48] v4 patches queued for 2.6.35 Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 01/48] rcu: optionally leave lockdep enabled after RCU lockdep splat Paul E. McKenney
2010-05-05 22:46 ` Mathieu Desnoyers
2010-05-05 23:05 ` Paul E. McKenney
2010-05-05 23:24 ` Mathieu Desnoyers
2010-05-05 23:36 ` Paul E. McKenney
2010-05-06 2:05 ` Mathieu Desnoyers
2010-05-06 23:09 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 02/48] rcu: substitute set_need_resched for sending resched IPIs Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 03/48] rcu: make dead code really dead Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 04/48] rcu: move some code from macro to function Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 05/48] rcu: ignore offline CPUs in last non-dyntick-idle CPU check Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 06/48] rcu: Fix bogus CONFIG_PROVE_LOCKING in comments to reflect reality Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 07/48] rcu: fix now-bogus rcu_scheduler_active comments Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 08/48] rcu: shrink rcutiny by making synchronize_rcu_bh() be inline Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 09/48] rcu: rename rcutiny rcu_ctrlblk to rcu_sched_ctrlblk Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 10/48] rcu: refactor RCU's context-switch handling Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 11/48] rcu: slim down rcutiny by removing rcu_scheduler_active and friends Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 12/48] rcu: enable CPU_STALL_VERBOSE by default Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 13/48] rcu: disable CPU stall warnings upon panic Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 14/48] rcu: print boot-time console messages if RCU configs out of ordinary Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 15/48] rcu: improve RCU CPU stall-warning messages Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 16/48] rcu: permit discontiguous cpu_possible_mask CPU numbering Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 17/48] rcu: v2: reduce the number of spurious RCU_SOFTIRQ invocations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 18/48] rcu: improve the RCU CPU-stall warning documentation Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 19/48] Debugobjects transition check Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 20/48] rcu head introduce rcu head init on stack Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 21/48] remove all rcu head initializations, except on_stack initializations Paul E. McKenney
2010-05-04 20:27 ` Matt Mackall
2010-05-04 20:36 ` Paul E. McKenney
2010-05-04 23:44 ` James Morris
2010-05-05 0:03 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 22/48] rcu head remove init Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 23/48] tree/tiny rcu: Add debug RCU head objects (v5) Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 24/48] rcu: make SRCU usable in modules Paul E. McKenney
2010-05-04 20:19 ` Paul E. McKenney [this message]
2010-05-04 20:19 ` [PATCH tip/core/rcu 26/48] rcu: RCU_FAST_NO_HZ must check RCU dyntick state Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 27/48] vfs: add fs.h to define struct file Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 28/48] net: Make accesses to ->br_port safe for sparse RCU Paul E. McKenney
2010-05-04 21:26 ` Stephen Hemminger
2010-05-04 21:41 ` Arnd Bergmann
2010-05-05 22:03 ` Paul E. McKenney
2010-05-06 14:09 ` Arnd Bergmann
2010-05-06 23:12 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 29/48] rcu: add an rcu_dereference_index_check() Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 30/48] mce: convert to rcu_dereference_index_check() Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 31/48] rcu: define __rcu address space modifier for sparse Paul E. McKenney
2010-05-04 20:58 ` Arnd Bergmann
2010-05-04 23:07 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 32/48] rculist: avoid __rcu annotations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 33/48] cgroups: " Paul E. McKenney
2010-05-04 20:48 ` Paul Menage
2010-05-05 0:04 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 34/48] credentials: rcu annotation Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 35/48] keys: __rcu annotations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 36/48] nfs: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 37/48] net: __rcu annotations for drivers Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 38/48] perf_event: __rcu annotations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 39/48] notifiers: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 40/48] radix-tree: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 41/48] idr: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 42/48] input: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 43/48] vhost: add " Paul E. McKenney
2010-05-04 21:39 ` Michael S. Tsirkin
2010-05-04 23:57 ` Paul E. McKenney
2010-05-04 23:59 ` Michael S. Tsirkin
2010-05-05 0:39 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 44/48] net/netfilter: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 45/48] kvm: add " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 46/48] kernel: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 47/48] net: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 48/48] kvm: more " Paul E. McKenney
2010-05-05 10:14 ` [PATCH tip/core/rcu 36/48] nfs: " David Howells
2010-05-05 12:44 ` Trond Myklebust
2010-05-05 21:01 ` Paul E. McKenney
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