linux-kernel - [lkp] [rhashtable] f9f51b8070: INFO: suspicious RCU usage. ]

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Date:	Fri, 18 Dec 2015 09:39:22 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	0day robot <fengguang.wu@...el.com>
Subject: [lkp] [rhashtable] f9f51b8070: INFO: suspicious RCU usage. ]

FYI, we noticed the below changes on

https://github.com/0day-ci/linux Herbert-Xu/rhashtable-Fix-walker-list-corruption/20151216-164833
commit f9f51b8070be3e829100614a7372b219723b864f ("rhashtable: Fix walker list corruption")


[    8.933376] ===============================
[    8.933376] ===============================
[    8.934629] [ INFO: suspicious RCU usage. ]
[    8.934629] [ INFO: suspicious RCU usage. ]
[    8.935941] 4.4.0-rc3-00995-gf9f51b8 #2 Not tainted
[    8.935941] 4.4.0-rc3-00995-gf9f51b8 #2 Not tainted
[    8.937494] -------------------------------
[    8.937494] -------------------------------
[    8.938818] lib/rhashtable.c:504 suspicious rcu_dereference_protected() usage!
[    8.938818] lib/rhashtable.c:504 suspicious rcu_dereference_protected() usage!
[    8.941705] 
[    8.941705] other info that might help us debug this:
[    8.941705] 
[    8.941705] 
[    8.941705] other info that might help us debug this:
[    8.941705] 
[    8.944161] 
[    8.944161] rcu_scheduler_active = 1, debug_locks = 0
[    8.944161] 
[    8.944161] rcu_scheduler_active = 1, debug_locks = 0
[    8.946244] 1 lock held by swapper/0/1:
[    8.946244] 1 lock held by swapper/0/1:
[    8.947463]  #0: 
[    8.947463]  #0:  ( (&(&ht->lock)->rlock&(&ht->lock)->rlock){+.+...}){+.+...}, at: , at: [<ffffffff814b8900>] rhashtable_walk_init+0x70/0x150
[<ffffffff814b8900>] rhashtable_walk_init+0x70/0x150
[    8.950428] 
[    8.950428] stack backtrace:
[    8.950428] 
[    8.950428] stack backtrace:
[    8.951770] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.0-rc3-00995-gf9f51b8 #2
[    8.951770] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.0-rc3-00995-gf9f51b8 #2
[    8.954245] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    8.954245] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    8.956973]  0000000000000001
[    8.956973]  0000000000000001 ffff880078393d30 ffff880078393d30 ffffffff81493238 ffffffff81493238 ffff88007838c040 ffff88007838c040

[    8.959333]  ffff880078393d60
[    8.959333]  ffff880078393d60 ffffffff8112cb9f ffffffff8112cb9f ffff880078393da0 ffff880078393da0 ffffffff83e9d6c0 ffffffff83e9d6c0

[    8.961684]  ffffffff83e9d7f0
[    8.961684]  ffffffff83e9d7f0 ffff880061720e00 ffff880061720e00 ffff880078393d90 ffff880078393d90 ffffffff814b89c8 ffffffff814b89c8

[    8.964148] Call Trace:
[    8.964148] Call Trace:
[    8.964955]  [<ffffffff81493238>] dump_stack+0x7c/0xb4
[    8.964955]  [<ffffffff81493238>] dump_stack+0x7c/0xb4
[    8.966728]  [<ffffffff8112cb9f>] lockdep_rcu_suspicious+0x14f/0x1c0
[    8.966728]  [<ffffffff8112cb9f>] lockdep_rcu_suspicious+0x14f/0x1c0
[    8.968753]  [<ffffffff814b89c8>] rhashtable_walk_init+0x138/0x150
[    8.968753]  [<ffffffff814b89c8>] rhashtable_walk_init+0x138/0x150
[    8.970567]  [<ffffffff815021d8>] test_bucket_stats+0x22/0x17d
[    8.970567]  [<ffffffff815021d8>] test_bucket_stats+0x22/0x17d
[    8.972682]  [<ffffffff82dda0fa>] test_rhashtable+0xe0/0x12ac
[    8.972682]  [<ffffffff82dda0fa>] test_rhashtable+0xe0/0x12ac
[    8.974746]  [<ffffffff816157db>] ? get_random_bytes+0x2b/0x40
[    8.974746]  [<ffffffff816157db>] ? get_random_bytes+0x2b/0x40
[    8.976467]  [<ffffffff814b6c33>] ? bucket_table_alloc+0x173/0x280
[    8.976467]  [<ffffffff814b6c33>] ? bucket_table_alloc+0x173/0x280
[    8.978548]  [<ffffffff82ddb3d5>] test_rht_init+0x10f/0x523
[    8.978548]  [<ffffffff82ddb3d5>] test_rht_init+0x10f/0x523
[    8.980179]  [<ffffffff82ddb2c6>] ? test_rhashtable+0x12ac/0x12ac
[    8.980179]  [<ffffffff82ddb2c6>] ? test_rhashtable+0x12ac/0x12ac
[    8.982424]  [<ffffffff82d9f757>] do_one_initcall+0x16b/0x248
[    8.982424]  [<ffffffff82d9f757>] do_one_initcall+0x16b/0x248
[    8.984208]  [<ffffffff82d9f9f8>] kernel_init_freeable+0x1c4/0x2b8
[    8.984208]  [<ffffffff82d9f9f8>] kernel_init_freeable+0x1c4/0x2b8
[    8.986165]  [<ffffffff81ed5b60>] ? rest_init+0x200/0x200
[    8.986165]  [<ffffffff81ed5b60>] ? rest_init+0x200/0x200
[    8.987925]  [<ffffffff81ed5b71>] kernel_init+0x11/0x190
[    8.987925]  [<ffffffff81ed5b71>] kernel_init+0x11/0x190
[    8.989608]  [<ffffffff81ee406f>] ret_from_fork+0x3f/0x70
[    8.989608]  [<ffffffff81ee406f>] ret_from_fork+0x3f/0x70
[    8.991270]  [<ffffffff81ed5b60>] ? rest_init+0x200/0x200
[    8.991270]  [<ffffffff81ed5b60>] ? rest_init+0x200/0x200


Thanks,
Kernel Test Robot

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