linux-kernel - Re: show_uevent() and general protection fault

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Date:	Fri, 13 Jul 2012 16:46:16 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Kay Sievers <kay.sievers@...y.org>, devel@...verdev.osuosl.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: show_uevent() and general protection fault

This is another kconfig, produced a bit different call trace, however
also related to sysfs_read_file().

[   14.619411] warning: process `trinity-child0' used the deprecated sysctl system call with 
[   32.792672] trinity-child0 (129): Using mlock ulimits for SHM_HUGETLB is deprecated
[   55.093218] BUG: unable to handle kernel paging request at 00007f4fa44392a0
[   55.093948] IP: [<ffffffff81456703>] strnlen+0x23/0x80
[   55.093948] PGD 0 
[   55.093948] Oops: 0000 [#1] 
[   55.093948] CPU 0 
[   55.093948] Pid: 145, comm: trinity-child0 Not tainted 3.5.0-rc1+ #4 Bochs Bochs
[   55.093948] RIP: 0010:[<ffffffff81456703>]  [<ffffffff81456703>] strnlen+0x23/0x80
[   55.093948] RSP: 0018:ffff88000ed65d38  EFLAGS: 00010206
[   55.093948] RAX: ffff88000ed65e38 RBX: ffff88000edb2000 RCX: 000000000000c0e4
[   55.093948] RDX: 00007f4fa44392a0 RSI: ffffffffffffffff RDI: 00007f4fa44392a0
[   55.093948] RBP: ffff88000ed65d38 R08: 000000000000ffff R09: 000000000000ffff
[   55.093948] R10: 0000000000000000 R11: ffff88000ed58560 R12: 00007f4fa44392a0
[   55.093948] R13: ffff88008edb1fff R14: 000000000000ffff R15: 0000000000000000
[   55.093948] FS:  00007ffb40b54700(0000) GS:ffffffff821b7000(0000) knlGS:0000000000000000
[   55.093948] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   55.093948] CR2: 00007f4fa44392a0 CR3: 000000000ed59000 CR4: 00000000000006b0
[   55.093948] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   55.093948] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   55.093948] Process trinity-child0 (pid: 145, threadinfo ffff88000ed64000, task ffff88000ed58000)
[   55.093948] Stack:
[   55.093948]  ffff88000ed65d78 ffffffff814587fc ffffffff821e9960 ffffffff82142ce5
[   55.093948]  ffff88008edb1fff ffff88000ed65e10 ffffffff82142ce5 ffff88000edb2000
[   55.093948]  ffff88000ed65df8 ffffffff81459763 ffff88000ed65da8 ffff88000ed58000
[   55.093948] Call Trace:
[   55.093948]  [<ffffffff814587fc>] string.isra.4+0x4c/0x120
[   55.093948]  [<ffffffff81459763>] vsnprintf+0x313/0x890
[   55.093948]  [<ffffffff810c0a3a>] ? param_attr_show+0x3a/0xb0
[   55.093948]  [<ffffffff8145a248>] sprintf+0x48/0x50
[   55.093948]  [<ffffffff810c0c41>] param_get_charp+0x21/0x30
[   55.093948]  [<ffffffff810c0a50>] param_attr_show+0x50/0xb0
[   55.093948]  [<ffffffff810c0778>] module_attr_show+0x28/0x40
[   55.093948]  [<ffffffff811d5300>] sysfs_read_file+0x120/0x280
[   55.093948]  [<ffffffff81163b4f>] vfs_read+0xff/0x210
[   55.093948]  [<ffffffff8116401d>] sys_read+0x5d/0xc0
[   55.093948]  [<ffffffff81bd2177>] system_call_fastpath+0x16/0x1b
[   55.093948] Code: 5d c3 66 0f 1f 44 00 00 55 48 83 05 b7 ea b2 01 01 48 85 f6 48 89 e5 74 58 48 8b 0d b0 ea b2 01 48 83 c1 01 48 89 0d a5 ea b2 01 <80> 3f 00 74 41 48 8b 05 a1 ea b2 01 48 8d 50 01 48 01 c6 48 89 
[   55.093948] RIP  [<ffffffff81456703>] strnlen+0x23/0x80
[   55.093948]  RSP <ffff88000ed65d38>
[   55.093948] CR2: 00007f4fa44392a0

Thanks,
Fengguang

View attachment "dmesg-kvm-bens-3448-2012-07-12-04-59-30" of type "text/plain" (124056 bytes)

View attachment "config-3.5.0-rc1+" of type "text/plain" (69912 bytes)