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Date: Thu, 8 Aug 2013 18:45:19 +0800
From: Ding Tianhong <dingtianhong@...wei.com>
To: Jon Maloy <jon.maloy@...csson.com>,
Allan Stephens <allan.stephens@...driver.com>,
"David S. Miller" <davem@...emloft.net>,
Netdev <netdev@...r.kernel.org>,
<tipc-discussion@...ts.sourceforge.net>
Subject: [PATCH 2/2] tipc: avoid possible deadlock while remove disc_timeout()
We met lockdep warning when enable and disable the bearer for commands such as:
tipc-config -netid=1234 -addr=1.1.3 -be=eth:eth0
tipc-config -netid=1234 -addr=1.1.3 -bd=eth:eth0
[ 327.693472]
[ 327.693595] ======================================================
[ 327.693994] [ INFO: possible circular locking dependency detected ]
[ 327.694519] 3.11.0-rc3-wwd-default #4 Tainted: G O
[ 327.694882] -------------------------------------------------------
[ 327.695385] tipc-config/5825 is trying to acquire lock:
[ 327.695754] (((timer))#2){+.-...}, at: [<ffffffff8105be80>] del_timer_sync+0x0/0xd0
[ 327.696018]
[ 327.696018] but task is already holding lock:
[ 327.696018] (&(&b_ptr->lock)->rlock){+.-...}, at: [<ffffffffa02be58d>] bearer_disable+0xdd/0x120 [tipc]
[ 327.696018]
[ 327.696018] which lock already depends on the new lock.
[ 327.696018]
[ 327.696018]
[ 327.696018] the existing dependency chain (in reverse order) is:
[ 327.696018]
[ 327.696018] -> #1 (&(&b_ptr->lock)->rlock){+.-...}:
[ 327.696018] [<ffffffff810b3b4d>] validate_chain+0x6dd/0x870
[ 327.696018] [<ffffffff810b40bb>] __lock_acquire+0x3db/0x670
[ 327.696018] [<ffffffff810b4453>] lock_acquire+0x103/0x130
[ 327.696018] [<ffffffff814d65b1>] _raw_spin_lock_bh+0x41/0x80
[ 327.696018] [<ffffffffa02c5d48>] disc_timeout+0x18/0xd0 [tipc]
[ 327.696018] [<ffffffff8105b92a>] call_timer_fn+0xda/0x1e0
[ 327.696018] [<ffffffff8105bcd7>] run_timer_softirq+0x2a7/0x2d0
[ 327.696018] [<ffffffff8105379a>] __do_softirq+0x16a/0x2e0
[ 327.696018] [<ffffffff81053a35>] irq_exit+0xd5/0xe0
[ 327.696018] [<ffffffff81033005>] smp_apic_timer_interrupt+0x45/0x60
[ 327.696018] [<ffffffff814df4af>] apic_timer_interrupt+0x6f/0x80
[ 327.696018] [<ffffffff8100b70e>] arch_cpu_idle+0x1e/0x30
[ 327.696018] [<ffffffff810a039d>] cpu_idle_loop+0x1fd/0x280
[ 327.696018] [<ffffffff810a043e>] cpu_startup_entry+0x1e/0x20
[ 327.696018] [<ffffffff81031589>] start_secondary+0x89/0x90
[ 327.696018]
[ 327.696018] -> #0 (((timer))#2){+.-...}:
[ 327.696018] [<ffffffff810b33fe>] check_prev_add+0x43e/0x4b0
[ 327.696018] [<ffffffff810b3b4d>] validate_chain+0x6dd/0x870
[ 327.696018] [<ffffffff810b40bb>] __lock_acquire+0x3db/0x670
[ 327.696018] [<ffffffff810b4453>] lock_acquire+0x103/0x130
[ 327.696018] [<ffffffff8105bebd>] del_timer_sync+0x3d/0xd0
[ 327.696018] [<ffffffffa02c5855>] tipc_disc_delete+0x15/0x30 [tipc]
[ 327.696018] [<ffffffffa02be59f>] bearer_disable+0xef/0x120 [tipc]
[ 327.696018] [<ffffffffa02be74f>] tipc_disable_bearer+0x2f/0x60 [tipc]
[ 327.696018] [<ffffffffa02bfb32>] tipc_cfg_do_cmd+0x2e2/0x550 [tipc]
[ 327.696018] [<ffffffffa02c8c79>] handle_cmd+0x49/0xe0 [tipc]
[ 327.696018] [<ffffffff8143e898>] genl_family_rcv_msg+0x268/0x340
[ 327.696018] [<ffffffff8143ed30>] genl_rcv_msg+0x70/0xd0
[ 327.696018] [<ffffffff8143d4c9>] netlink_rcv_skb+0x89/0xb0
[ 327.696018] [<ffffffff8143e617>] genl_rcv+0x27/0x40
[ 327.696018] [<ffffffff8143d21e>] netlink_unicast+0x15e/0x1b0
[ 327.696018] [<ffffffff8143ddcf>] netlink_sendmsg+0x22f/0x400
[ 327.696018] [<ffffffff813f7836>] __sock_sendmsg+0x66/0x80
[ 327.696018] [<ffffffff813f7957>] sock_aio_write+0x107/0x120
[ 327.696018] [<ffffffff8117f76d>] do_sync_write+0x7d/0xc0
[ 327.696018] [<ffffffff8117fc56>] vfs_write+0x186/0x190
[ 327.696018] [<ffffffff811803e0>] SyS_write+0x60/0xb0
[ 327.696018] [<ffffffff814de852>] system_call_fastpath+0x16/0x1b
[ 327.696018]
[ 327.696018] other info that might help us debug this:
[ 327.696018]
[ 327.696018] Possible unsafe locking scenario:
[ 327.696018]
[ 327.696018] CPU0 CPU1
[ 327.696018] ---- ----
[ 327.696018] lock(&(&b_ptr->lock)->rlock);
[ 327.696018] lock(((timer))#2);
[ 327.696018] lock(&(&b_ptr->lock)->rlock);
[ 327.696018] lock(((timer))#2);
[ 327.696018]
[ 327.696018] *** DEADLOCK ***
[ 327.696018]
[ 327.696018] 5 locks held by tipc-config/5825:
[ 327.696018] #0: (cb_lock){++++++}, at: [<ffffffff8143e608>] genl_rcv+0x18/0x40
[ 327.696018] #1: (genl_mutex){+.+.+.}, at: [<ffffffff8143ed66>] genl_rcv_msg+0xa6/0xd0
[ 327.696018] #2: (config_mutex){+.+.+.}, at: [<ffffffffa02bf889>] tipc_cfg_do_cmd+0x39/0x550 [tipc]
[ 327.696018] #3: (tipc_net_lock){++.-..}, at: [<ffffffffa02be738>] tipc_disable_bearer+0x18/0x60 [tipc]
[ 327.696018] #4: (&(&b_ptr->lock)->rlock){+.-...}, at: [<ffffffffa02be58d>] bearer_disable+0xdd/0x120 [tipc]
[ 327.696018]
[ 327.696018] stack backtrace:
[ 327.696018] CPU: 2 PID: 5825 Comm: tipc-config Tainted: G O 3.11.0-rc3-wwd-default #4
[ 327.696018] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[ 327.696018] 00000000ffffffff ffff880037fa77a8 ffffffff814d03dd 0000000000000000
[ 327.696018] ffff880037fa7808 ffff880037fa77e8 ffffffff810b1c4f 0000000037fa77e8
[ 327.696018] ffff880037fa7808 ffff880037e4db40 0000000000000000 ffff880037e4e318
[ 327.696018] Call Trace:
[ 327.696018] [<ffffffff814d03dd>] dump_stack+0x4d/0xa0
[ 327.696018] [<ffffffff810b1c4f>] print_circular_bug+0x10f/0x120
[ 327.696018] [<ffffffff810b33fe>] check_prev_add+0x43e/0x4b0
[ 327.696018] [<ffffffff810b3b4d>] validate_chain+0x6dd/0x870
[ 327.696018] [<ffffffff81087a28>] ? sched_clock_cpu+0xd8/0x110
[ 327.696018] [<ffffffff810b40bb>] __lock_acquire+0x3db/0x670
[ 327.696018] [<ffffffff810b4453>] lock_acquire+0x103/0x130
[ 327.696018] [<ffffffff8105be80>] ? try_to_del_timer_sync+0x70/0x70
[ 327.696018] [<ffffffff8105bebd>] del_timer_sync+0x3d/0xd0
[ 327.696018] [<ffffffff8105be80>] ? try_to_del_timer_sync+0x70/0x70
[ 327.696018] [<ffffffffa02c5855>] tipc_disc_delete+0x15/0x30 [tipc]
[ 327.696018] [<ffffffffa02be59f>] bearer_disable+0xef/0x120 [tipc]
[ 327.696018] [<ffffffffa02be74f>] tipc_disable_bearer+0x2f/0x60 [tipc]
[ 327.696018] [<ffffffffa02bfb32>] tipc_cfg_do_cmd+0x2e2/0x550 [tipc]
[ 327.696018] [<ffffffff81218783>] ? security_capable+0x13/0x20
[ 327.696018] [<ffffffffa02c8c79>] handle_cmd+0x49/0xe0 [tipc]
[ 327.696018] [<ffffffff8143e898>] genl_family_rcv_msg+0x268/0x340
[ 327.696018] [<ffffffff8143ed30>] genl_rcv_msg+0x70/0xd0
[ 327.696018] [<ffffffff8143ecc0>] ? genl_lock+0x20/0x20
[ 327.696018] [<ffffffff8143d4c9>] netlink_rcv_skb+0x89/0xb0
[ 327.696018] [<ffffffff8143e608>] ? genl_rcv+0x18/0x40
[ 327.696018] [<ffffffff8143e617>] genl_rcv+0x27/0x40
[ 327.696018] [<ffffffff8143d21e>] netlink_unicast+0x15e/0x1b0
[ 327.696018] [<ffffffff81289d7c>] ? memcpy_fromiovec+0x6c/0x90
[ 327.696018] [<ffffffff8143ddcf>] netlink_sendmsg+0x22f/0x400
[ 327.696018] [<ffffffff813f7836>] __sock_sendmsg+0x66/0x80
[ 327.696018] [<ffffffff813f7957>] sock_aio_write+0x107/0x120
[ 327.696018] [<ffffffff813fe29c>] ? release_sock+0x8c/0xa0
[ 327.696018] [<ffffffff8117f76d>] do_sync_write+0x7d/0xc0
[ 327.696018] [<ffffffff8117fa24>] ? rw_verify_area+0x54/0x100
[ 327.696018] [<ffffffff8117fc56>] vfs_write+0x186/0x190
[ 327.696018] [<ffffffff811803e0>] SyS_write+0x60/0xb0
[ 327.696018] [<ffffffff814de852>] system_call_fastpath+0x16/0x1b
Signed-off-by: Wang Weidong <wangweidong1@...wei.com>
Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
---
net/tipc/bearer.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 7687211..9dc8c84 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -461,22 +461,22 @@ static void bearer_disable(struct tipc_bearer *b_ptr)
struct tipc_link *l_ptr;
struct tipc_link *temp_l_ptr;
struct list_head list;
+ struct tipc_link_req *temp_req;
pr_info("Disabling bearer <%s>\n", b_ptr->name);
spin_lock_bh(&b_ptr->lock);
b_ptr->blocked = 1;
b_ptr->media->disable_bearer(b_ptr);
list_replace_init(&b_ptr->links, &list);
+ temp_req = b_ptr->link_req;
spin_unlock_bh(&b_ptr->lock);
list_for_each_entry_safe(l_ptr, temp_l_ptr, &list, link_list) {
tipc_link_delete(l_ptr);
}
- spin_lock_bh(&b_ptr->lock);
- if (b_ptr->link_req)
- tipc_disc_delete(b_ptr->link_req);
- spin_unlock_bh(&b_ptr->lock);
+ if (temp_req)
+ tipc_disc_delete(temp_req);
memset(b_ptr, 0, sizeof(struct tipc_bearer));
}
--
1.8.2.1
--
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