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Subject: Re: [apparmor_mmap_file] WARNING: bad unlock balance detected!
To:     Fengguang Wu <fengguang.wu@intel.com>,
        linux-security-module@vger.kernel.org
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Eric Paris <eparis@redhat.com>
References: <20171107013821.2b34a6i6uez37stu@wfg-t540p.sh.intel.com>
From:   John Johansen <john.johansen@canonical.com>
Organization: Canonical
Message-ID: <a2bd530e-b3a4-09b3-227b-b095cfd8a1ce@canonical.com>
Date:   Wed, 8 Nov 2017 07:54:53 -0800
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On 11/06/2017 05:38 PM, Fengguang Wu wrote:
> Hi,
> 
> Here is a warning in 4.14-rc8 -- it's not necessarily a new bug.
> 
sigh, yep its older than 4.14 but I have haven't finished bisecting it yet

thanks

> Please press Enter to activate this console.
> [�� 45.117766] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
> [�� 45.122174] 8021q: adding VLAN 0 to HW filter on device eth0
> [�� 45.247159] [�� 45.247451] =====================================
> [�� 45.248021] WARNING: bad unlock balance detected!
> [�� 45.248608] 4.14.0-rc8 #158 Not tainted
> [�� 45.249087] -------------------------------------
> [�� 45.249672] fw3/1183 is trying to release lock (rcu_preempt_state) at:
> [�� 45.250443] [<c10e4348>] rcu_read_unlock_special+0x5f8/0x620
> [�� 45.251136] but there are no more locks to release!
> [�� 45.251752] [�� 45.251752] other info that might help us debug this:
> [�� 45.252561] 1 lock held by fw3/1183:
> [�� 45.253019]� #0:� (rcu_read_lock){....}, at: [<c16e24c0>] aa_file_perm+0x0/0x460
> [�� 45.253925] [�� 45.253925] stack backtrace:
> [�� 45.254526] CPU: 0 PID: 1183 Comm: fw3 Not tainted 4.14.0-rc8 #158
> [�� 45.255275] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> [�� 45.256266] Call Trace:
> [�� 45.256628]� dump_stack+0x16/0x1c
> [�� 45.257082]� print_unlock_imbalance_bug+0xb9/0xd0
> [�� 45.257676]� ? rcu_read_unlock_special+0x5f8/0x620
> [�� 45.258259]� ? rcu_read_unlock_special+0x5f8/0x620
> [�� 45.258871]� lock_release+0x1cc/0x490
> [�� 45.259347]� ? rcu_read_unlock_special+0x5f8/0x620
> [�� 45.259969]� ? _raw_spin_unlock_irqrestore+0x86/0xd0
> [�� 45.260581]� rt_mutex_unlock+0x1e/0xb0
> [�� 45.261054]� rcu_read_unlock_special+0x5f8/0x620
> [�� 45.261643]� __rcu_read_unlock+0xa7/0xb0
> [�� 45.262152]� aa_file_perm+0x5a/0x460
> [�� 45.262633]� ? pvclock_clocksource_read+0xd5/0x230
> [�� 45.263203]� ? pvclock_clocksource_read+0xd5/0x230
> [�� 45.263797]� common_file_perm+0x81/0x240
> [�� 45.264308]� ? kvm_sched_clock_read+0x9/0x20
> [�� 45.264843]� common_mmap+0x93/0xd0
> [�� 45.265283]� ? apparmor_file_mprotect+0x30/0x30
> [�� 45.265867]� apparmor_mmap_file+0x12/0x20
> [�� 45.266388]� security_mmap_file+0xaf/0x170
> [�� 45.266903]� vm_mmap_pgoff+0x35/0x100
> [�� 45.267381]� ? __fget+0x1c3/0x1d0
> [�� 45.267831]� SyS_mmap_pgoff+0x16d/0x370
> [�� 45.268318]� do_int80_syscall_32+0x95/0x290
> [�� 45.268840]� entry_INT80_32+0x2f/0x2f
> [�� 45.269313] EIP: 0xb7f7c2d4
> [�� 45.269713] EFLAGS: 00000202 CPU: 0
> [�� 45.270169] EAX: ffffffda EBX: b7f63000 ECX: 000002ad EDX: 00000003
> [�� 45.270901] ESI: 00000012 EDI: 00000003 EBP: 00000004 ESP: bff29f24
> [�� 45.271637]� DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 007b
> [�� 45.351763] 8021q: adding VLAN 0 to HW filter on device eth0
> LKP: HOSTNAME vm-lkp-nhm-dp1-openwrt-ia32-6, MAC , kernel 4.14.0-rc8 158, serial console /dev/ttyS0
> [�� 47.390581] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
> 
> Thanks,
> Fengguang


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