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Date: Sun, 21 Apr 2013 15:43:04 +0800 From: Cong Wang <amwang@...hat.com> To: Patrick McHardy <kaber@...sh.net> Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net> Subject: A regression introduced by 802.1ad support patches Hi, Patrick, Your recent 802.1ad patches causes the following bug. After resetting HEAD to commit c296289 (Merge branch 'intel'), this bug is not reproducible any more. It is pretty easy to reproduce in my KVM guest, just boot the guest and then shut it down, the following traces will be shown. Although it is not 100% reproducible, it appears more than 80% times at least. I am glad to provide any other information if you need, and of course can test any fix if you want. [ 86.812073] kmemleak: Found object by alias at 0xffff88006ecc76f0 [ 86.816019] Pid: 739, comm: kworker/u:1 Not tainted 3.9.0-rc5+ #842 [ 86.816019] Call Trace: [ 86.816019] <IRQ> [<ffffffff81151c58>] find_and_get_object +0x8c/0xdf [ 86.816019] [<ffffffff8190e90d>] ? vlan_info_rcu_free+0x33/0x49 [ 86.816019] [<ffffffff81151cbe>] delete_object_full+0x13/0x2f [ 86.816019] [<ffffffff8194bbb6>] kmemleak_free+0x26/0x45 [ 86.816019] [<ffffffff8113e8c7>] slab_free_hook+0x1e/0x7b [ 86.816019] [<ffffffff81141c05>] kfree+0xce/0x14b [ 86.816019] [<ffffffff8190e90d>] vlan_info_rcu_free+0x33/0x49 [ 86.816019] [<ffffffff810d0b0b>] rcu_do_batch+0x261/0x4e7 [ 86.816019] [<ffffffff810a308f>] ? mark_held_locks+0x6d/0x95 [ 86.816019] [<ffffffff8190e8da>] ? __vlan_vid_del+0xa6/0xa6 [ 86.816019] [<ffffffff810d0e99>] __rcu_process_callbacks+0x108/0x133 [ 86.816019] [<ffffffff810d0f09>] rcu_process_callbacks+0x45/0x72 [ 86.816019] [<ffffffff81058163>] __do_softirq+0x133/0x2a3 [ 86.816019] [<ffffffff8105840c>] irq_exit+0x5d/0xa4 [ 86.816019] [<ffffffff81983751>] smp_apic_timer_interrupt+0x7c/0x8a [ 86.816019] [<ffffffff81982832>] apic_timer_interrupt+0x72/0x80 [ 86.816019] <EOI> [<ffffffff8102f3e0>] ? __flush_tlb_all+0x15/0x22 [ 86.816019] [<ffffffff8145b427>] ? clear_page_c+0x7/0x10 [ 86.816019] [<ffffffff81105203>] ? prep_new_page+0x133/0x17f [ 86.816019] [<ffffffff8110567e>] ? get_page_from_freelist +0x42f/0x523 [ 86.816019] [<ffffffff811056a6>] get_page_from_freelist+0x457/0x523 [ 86.816019] [<ffffffff810a37b9>] ? lock_is_held+0x56/0x60 [ 86.816019] [<ffffffff811058d6>] __alloc_pages_nodemask+0x164/0x700 [ 86.816019] [<ffffffff81029e91>] ? kvm_clock_read+0x34/0x3b [ 86.816019] [<ffffffff810852e9>] ? local_clock+0x14/0x4f [ 86.816019] [<ffffffff81029e91>] ? kvm_clock_read+0x34/0x3b [ 86.816019] [<ffffffff810852e9>] ? local_clock+0x14/0x4f [ 86.816019] [<ffffffff810e595b>] ? time_hardirqs_off+0x15/0x2a [ 86.816019] [<ffffffff8108530b>] ? local_clock+0x36/0x4f [ 86.816019] [<ffffffff8108530b>] ? local_clock+0x36/0x4f [ 86.816019] [<ffffffff81139f94>] alloc_pages_current+0xfa/0x11b [ 86.816019] [<ffffffff811029b6>] __get_free_pages+0x16/0x44 [ 86.816019] [<ffffffff811029fa>] get_zeroed_page+0x16/0x18 [ 86.816019] [<ffffffff81121bd8>] __pud_alloc+0x20/0xa4 [ 86.816019] [<ffffffff81121c74>] pud_alloc+0x18/0x30 [ 86.816019] [<ffffffff81121df2>] handle_mm_fault+0x92/0x264 [ 86.816019] [<ffffffff81122375>] __get_user_pages+0x31d/0x4bb [ 86.816019] [<ffffffff81154759>] ? do_sync_read+0x6d/0xaa [ 86.816019] [<ffffffff811225ba>] get_user_pages+0x52/0x54 [ 86.816019] [<ffffffff81159614>] get_arg_page+0x5a/0xc4 [ 86.816019] [<ffffffff81084631>] ? __might_sleep+0xbe/0x19b [ 86.816019] [<ffffffff811597b1>] copy_strings+0x133/0x210 [ 86.816019] [<ffffffff8115a443>] copy_strings_kernel+0x53/0x61 [ 86.816019] [<ffffffff8115b145>] do_execve_common+0x1c1/0x338 [ 86.816019] [<ffffffff8115b2fc>] do_execve+0x40/0x42 [ 86.816019] [<ffffffff8106844d>] ____call_usermodehelper+0x100/0x11a [ 86.816019] [<ffffffff81068467>] ? ____call_usermodehelper +0x11a/0x11a [ 86.816019] [<ffffffff81068485>] call_helper+0x1e/0x20 [ 86.816019] [<ffffffff81981aec>] ret_from_fork+0x7c/0xb0 [ 86.816019] [<ffffffff81068467>] ? ____call_usermodehelper +0x11a/0x11a [ 86.816019] kmemleak: Object 0xffff88006ecc76d0 (size 256): [ 86.816019] kmemleak: comm "NetworkManager", pid 342, jiffies 4294896763 [ 86.816019] kmemleak: min_count = 1 [ 86.816019] kmemleak: count = 1 [ 86.816019] kmemleak: flags = 0x1 [ 86.816019] kmemleak: checksum = 0 [ 86.816019] kmemleak: backtrace: [ 86.816019] [<ffffffff8194bae0>] kmemleak_alloc+0x26/0x43 [ 86.816019] [<ffffffff8113e771>] slab_post_alloc_hook+0x28/0x2a [ 86.816019] [<ffffffff8114183d>] __kmalloc+0x114/0x145 [ 86.816019] [<ffffffff8190e9ea>] kzalloc.constprop.4+0xe/0x10 [ 86.816019] [<ffffffff8190f008>] vlan_vid_add+0x98/0x146 [ 86.816019] [<ffffffff8190f8d1>] vlan_device_event+0xbb/0x3c4 [ 86.816019] [<ffffffff8107896f>] notifier_call_chain+0x96/0xcd [ 86.816019] [<ffffffff81078d35>] raw_notifier_call_chain +0x14/0x16 [ 86.816019] [<ffffffff8176e68e>] call_netdevice_notifiers +0x4a/0x4f [ 86.816019] [<ffffffff81771aed>] __dev_notify_flags+0x37/0x5b [ 86.816019] [<ffffffff81771b59>] dev_change_flags+0x48/0x53 [ 86.816019] [<ffffffff8177e743>] do_setlink+0x29e/0x5d6 [ 86.816019] [<ffffffff8177f0d1>] rtnl_newlink+0x257/0x436 [ 86.816019] [<ffffffff8177d80f>] rtnetlink_rcv_msg+0x19c/0x1ab [ 86.816019] [<ffffffff817c5a1f>] netlink_rcv_skb+0x42/0x8d [ 86.816019] [<ffffffff8177d655>] rtnetlink_rcv+0x26/0x2d <..........More traces are snipped here...........> Thanks! -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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