linux-kernel - kmemcheck: got WARNING when dynamicly adjust /proc/sys/kernel/kmemcheck to 0/1

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Date:	Fri, 9 May 2014 15:57:41 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Vegard Nossum <vegard.nossum@...cle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	David Rientjes <rientjes@...gle.com>,
	Vegard Nossum <vegard.nossum@...il.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Xishi Qiu <qiuxishi@...wei.com>
Subject: kmemcheck: got WARNING when dynamicly adjust /proc/sys/kernel/kmemcheck
 to 0/1

OS boot with kmemcheck=0, then set 1, do something, set 0, do something, set 1...
then I got the WARNING log. Does kmemcheck support dynamicly adjust?

Thanks,
Xishi Qiu

[   20.200305] igb: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
[   20.208652] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   20.216504] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   22.647385] auditd (3116): /proc/3116/oom_adj is deprecated, please use /proc/3116/oom_score_adj instead.
[   24.845214] BIOS EDD facility v0.16 2004-Jun-25, 1 devices found
[   30.434764] eth0: no IPv6 routers present
[  340.154608] NOHZ: local_softirq_pending 01
[  340.154639] WARNING: kmemcheck: Caught 64-bit read from uninitialized memory (ffff88083f43a550)
[  340.154644] c000000002000000000000000000000080ff5d0100c9ffff400ed34e0888ffff
[  340.154667]  u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
[  340.154687]                                  ^
[  340.154690]
[  340.154694] Pid: 3, comm: ksoftirqd/0 Tainted: G         C   3.4.24-qiuxishi.19-0.1-default+ #2 Huawei Technologies Co., Ltd. Tecal RH2285 V2-24S/BC11SRSC1
[  340.154702] RIP: 0010:[<ffffffff81217d72>]  [<ffffffff81217d72>] d_namespace_path+0x132/0x270
[  340.154714] RSP: 0018:ffff8808515a1c88  EFLAGS: 00010202
[  340.154718] RAX: ffff88083f43a540 RBX: ffff880852e718f3 RCX: 0000000000000001
[  340.154721] RDX: ffff8808515a1d28 RSI: 0000000000000000 RDI: ffff881053855a60
[  340.154725] RBP: ffff8808515a1ce8 R08: ffff8808515a1c50 R09: ffff880852e75800
[  340.154728] R10: 00000000000156f0 R11: 0000000000000000 R12: 0000000000000001
[  340.154731] R13: 0000000000000100 R14: ffff880852e71510 R15: ffff880852e71800
[  340.154736] FS:  0000000000000000(0000) GS:ffff88085f600000(0000) knlGS:0000000000000000
[  340.154740] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  340.154743] CR2: ffff880852e71570 CR3: 00000008513f2000 CR4: 00000000000407f0
[  340.154746] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  340.154750] DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[  340.154753]  [<ffffffff81217f35>] aa_path_name+0x85/0x180
[  340.154758]  [<ffffffff812187d6>] apparmor_bprm_set_creds+0x126/0x520
[  340.154763]  [<ffffffff811f60ae>] security_bprm_set_creds+0xe/0x10
[  340.154771]  [<ffffffff81170d65>] prepare_binprm+0xa5/0x100
[  340.154777]  [<ffffffff811716c2>] do_execve_common+0x232/0x430
[  340.154781]  [<ffffffff8117194a>] do_execve+0x3a/0x40
[  340.154785]  [<ffffffff8100abb9>] sys_execve+0x49/0x70
[  340.154793]  [<ffffffff814764bc>] stub_execve+0x6c/0xc0
[  340.154801]  [<ffffffffffffffff>] 0xffffffffffffffff
[  340.154813] WARNING: kmemcheck: Caught 64-bit read from uninitialized memory (ffff88083f43a570)
[  340.154817] 746f70000300000078a5433f0888fffff86d433f0888ffff746f700000730000
[  340.154839]  u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
[  340.154858]                                  ^
[  340.154861]
[  340.154864] Pid: 3, comm: ksoftirqd/0 Tainted: G         C   3.4.24-qiuxishi.19-0.1-default+ #2 Huawei Technologies Co., Ltd. Tecal RH2285 V2-24S/BC11SRSC1
[  340.154871] RIP: 0010:[<ffffffff811691f4>]  [<ffffffff811691f4>] rw_verify_area+0x24/0x100
[  340.154880] RSP: 0018:ffff8808515a1dc8  EFLAGS: 00010202
[  340.154883] RAX: ffff88083f43a540 RBX: 0000000000000080 RCX: 0000000000000080
[  340.154887] RDX: ffff8808515a1e30 RSI: ffff880852e71500 RDI: 0000000000000000
[  340.154890] RBP: ffff8808515a1de8 R08: ffff880852e73200 R09: ffff88085f004900
[  340.154894] R10: ffff880852e72600 R11: 0000000000000000 R12: ffff880852e71500
[  340.154897] R13: 0000000000000000 R14: ffff880852e73200 R15: 0000000000000001
[  340.154901] FS:  0000000000000000(0000) GS:ffff88085f600000(0000) knlGS:0000000000000000
[  340.154905] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  340.154908] CR2: ffff880852e71570 CR3: 00000008513f2000 CR4: 00000000000407f0
[  340.154911] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  340.154914] DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[  340.154917]  [<ffffffff811698f4>] vfs_read+0xa4/0x130
[  340.154922]  [<ffffffff81170ca4>] kernel_read+0x44/0x60
[  340.154926]  [<ffffffff81170d90>] prepare_binprm+0xd0/0x100
[  340.154931]  [<ffffffff811716c2>] do_execve_common+0x232/0x430
[  340.154935]  [<ffffffff8117194a>] do_execve+0x3a/0x40
[  340.154939]  [<ffffffff8100abb9>] sys_execve+0x49/0x70
[  340.154944]  [<ffffffff814764bc>] stub_execve+0x6c/0xc0
[  340.154950]  [<ffffffffffffffff>] 0xffffffffffffffff
[  340.154955] WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (ffff88083f43a540)
[  340.154959] c000000002000000000000000000000080ff5d0100c9ffff400ed34e0888ffff
[  340.154981]  u u u u u u u u u u u u u u u u i i i i i i i i u u u u u u u u
[  340.155000]  ^

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