linux-kernel - Re: ima: BUG: spinlock bad magic

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Message-Id: <1473677916.3785.15.camel@linux.vnet.ibm.com>
Date:   Mon, 12 Sep 2016 06:58:36 -0400
From:   Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     dmitry.kasatkin@...il.com, james.l.morris@...cle.com,
        serge@...lyn.com, linux-ima-devel@...ts.sourceforge.net,
        linux-ima-user@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: ima: BUG: spinlock bad magic

Hi Dmitry,

On Fri, 2016-09-09 at 21:19 +0200, Dmitry Vyukov wrote:
> Hello,
> 
> While booting linux-next on 4affa544adb8077403893e62b9e327fcf87de6f7
> (Sep 8), I've got the following BUG:
> 
> BUG: spinlock bad magic on CPU#3, swapper/0/1
>  lock: template_list+0x0/0x60, .magic: 00000000, .owner: <none>/-1,
> .owner_cpu: 0
> CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.8.0-rc5-next-20160905+ #14
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
>  ffffffff886b6fe0 ffff88003ebf7d48 ffffffff82db81a9 ffffffff870b20c0
>  fffffbfff10d6dfc ffffffff8a6ac660 ffff88003ebee040 dffffc0000000000
>  ffffffff88ad2ca0 dffffc0000000000 ffff88003ebf7d80 ffffffff814a71fd
> Call Trace:
>  [<     inline     >] __dump_stack lib/dump_stack.c:15
>  [<ffffffff82db81a9>] dump_stack+0x12e/0x185 lib/dump_stack.c:51
>  [<ffffffff814a71fd>] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
>  [<     inline     >] spin_bug kernel/locking/spinlock_debug.c:75
>  [<     inline     >] debug_spin_lock_before kernel/locking/spinlock_debug.c:83
>  [<ffffffff814a75e4>] do_raw_spin_lock+0x224/0x2b0
> kernel/locking/spinlock_debug.c:135
>  [<     inline     >] __raw_spin_lock ./include/linux/spinlock_api_smp.h:145
>  [<ffffffff86e19a4b>] _raw_spin_lock+0x3b/0x50 kernel/locking/spinlock.c:151
>  [<     inline     >] spin_lock ./include/linux/spinlock.h:302
>  [<ffffffff896de48a>] ima_init_template_list+0x4c/0x10c
> security/integrity/ima/ima_template.c:218
>  [<ffffffff896ddb26>] init_ima+0xf/0x44 security/integrity/ima/ima_main.c:421
>  [<ffffffff81002310>] do_one_initcall+0xa0/0x2b0 init/main.c:782
>  [<     inline     >] do_initcall_level init/main.c:848
>  [<     inline     >] do_initcalls init/main.c:856
>  [<     inline     >] do_basic_setup init/main.c:874
>  [<ffffffff8963fd43>] kernel_init_freeable+0x476/0x52f init/main.c:1021
>  [<ffffffff86dff183>] kernel_init+0x13/0x160 init/main.c:947
>  [<ffffffff86e1ab4a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
> 
> Seems to be caused by:
> 
> commit 5d74ec48cc8fd2109001c36bada5bf69c046b487
> Author: Mimi Zohar <zohar@...ux.vnet.ibm.com>
> Date:   Sat Sep 3 15:20:40 2016 +1000
>     ima: store the builtin/custom template definitions in a list

Thank you for reporting this bug.  The fix will be included in the v4
post.

Mimi