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Date: Thu, 2 Aug 2012 09:26:05 -0400
From: Dave Jones <davej@redhat.com>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Peter Zijlstra <peterz@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>, tglx@linutronix.de,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: tasklist_lock lockdep warnings on 3.6
Message-ID: <20120802132605.GA27474@redhat.com>
Mail-Followup-To: Dave Jones <davej@redhat.com>,
	Sasha Levin <levinsasha928@gmail.com>, Ingo Molnar <mingo@elte.hu>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Morton <akpm@linux-foundation.org>, tglx@linutronix.de,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Mon, Jul 30, 2012 at 04:50:46PM +0200, Sasha Levin wrote:
 > ping?
 > 
 > I'm still seeing this on linux-next.

Likewise, except I'm seeing it in Linus' tree since shortly after this merge window
began. (https://lkml.org/lkml/2012/7/24/443).

I've spent all of this last week doing multiple attempts at bisecting this without success.
(It doesn't always show up, and even after running the test for over an hour before
marking a build 'good')

Anyone ?

	Dave



 
 > On Wed, Jul 25, 2012 at 8:42 AM, Sasha Levin <levinsasha928@gmail.com> wrote:
 > > Hi all,
 > >
 > > I've stumbled on the following while fuzzing with trinity inside a KVM tools guest on 3.6 kernel:
 > >
 > > [  250.495512] ======================================================
 > > [  250.496020] [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
 > > [  250.496020] 3.5.0-sasha-01646-g39c0dda #269 Tainted: G        W
 > > [  250.496020] ------------------------------------------------------
 > > [  250.496020] trinity-child15/6956 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
 > > [  250.496020]  (tasklist_lock){.+.+..}, at: [<ffffffff811089da>] posix_cpu_timer_del+0x2a/0x110
 > > [  250.496020]
 > > [  250.496020] and this task is already holding:
 > > [  250.496020]  (&(&new_timer->it_lock)->rlock){-.-...}, at: [<ffffffff81105a10>] exit_itimers+0x50/0x140
 > > [  250.496020] which would create a new lock dependency:
 > > [  250.496020]  (&(&new_timer->it_lock)->rlock){-.-...} -> (tasklist_lock){.+.+..}
 > > [  250.496020]
 > > [  250.496020] but this new dependency connects a HARDIRQ-irq-safe lock:
 > > [  250.496020]  (&(&new_timer->it_lock)->rlock){-.-...}
 > > ... which became HARDIRQ-irq-safe at:
 > > [  250.496020]   [<ffffffff81149e3c>] mark_irqflags+0x7c/0x190
 > > [  250.496020]   [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.496020]   [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.496020]   [<ffffffff83699e79>] _raw_spin_lock_irqsave+0x79/0xc0
 > > [  250.496020]   [<ffffffff81104ee2>] posix_timer_fn+0x32/0xd0
 > > [  250.496020]   [<ffffffff8110b25e>] __run_hrtimer+0x27e/0x4d0
 > > [  250.496020]   [<ffffffff8110c299>] hrtimer_interrupt+0x119/0x220
 > > [  250.496020]   [<ffffffff81090215>] smp_apic_timer_interrupt+0x85/0xa0
 > > [  250.496020]   [<ffffffff8369c4af>] apic_timer_interrupt+0x6f/0x80
 > > [  250.496020]   [<ffffffff8118ec1e>] rcu_lockdep_current_cpu_online+0x6e/0xa0
 > > [  250.496020]   [<ffffffff812a57be>] proc_sys_compare+0x7e/0x130
 > > [  250.496020]   [<ffffffff8124a09c>] __d_lookup+0x18c/0x2e0
 > > [  250.496020]   [<ffffffff8123d216>] lookup_fast+0x136/0x240
 > > [  250.496020]   [<ffffffff8123da1c>] link_path_walk+0x22c/0x8f0
 > > [  250.496020]   [<ffffffff8123e137>] path_lookupat+0x57/0x720
 > > [  250.496020]   [<ffffffff8123e82c>] do_path_lookup+0x2c/0xc0
 > > [  250.496020]   [<ffffffff8123ee14>] user_path_at_empty+0x64/0xa0
 > > [  250.496020]   [<ffffffff8123ee5c>] user_path_at+0xc/0x10
 > > [  250.496020]   [<ffffffff8122e6be>] sys_chdir+0x1e/0x70
 > > [  250.496020]   [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
 > > [  250.496020]
 > > [  250.496020] to a HARDIRQ-irq-unsafe lock:
 > > [  250.496020]  (&(&p->alloc_lock)->rlock){+.+...}
 > > ... which became HARDIRQ-irq-unsafe at:
 > > [  250.496020] ...  [<ffffffff81149ec0>] mark_irqflags+0x100/0x190
 > > [  250.496020]   [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.496020]   [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.496020]   [<ffffffff83699dcb>] _raw_spin_lock+0x3b/0x70
 > > [  250.496020]   [<ffffffff81237ed1>] set_task_comm+0x31/0x1c0
 > > [  250.496020]   [<ffffffff8110665c>] kthreadd+0x2c/0x170
 > > [  250.496020]   [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
 > > [  250.496020]
 > > [  250.496020] other info that might help us debug this:
 > > [  250.496020]
 > > [  250.496020] Chain exists of:
 > >   &(&new_timer->it_lock)->rlock --> tasklist_lock --> &(&p->alloc_lock)->rlock
 > >
 > > [  250.496020]  Possible interrupt unsafe locking scenario:
 > > [  250.496020]
 > > [  250.496020]        CPU0                    CPU1
 > > [  250.496020]        ----                    ----
 > > [  250.496020]   lock(&(&p->alloc_lock)->rlock);
 > > [  250.496020]                                local_irq_disable();
 > > [  250.496020]                                lock(&(&new_timer->it_lock)->rlock);
 > > [  250.496020]                                lock(tasklist_lock);
 > > [  250.496020]   <Interrupt>
 > > [  250.496020]     lock(&(&new_timer->it_lock)->rlock);
 > > [  250.496020]
 > > [  250.496020]  *** DEADLOCK ***
 > > [  250.496020]
 > > [  250.496020] 1 lock held by trinity-child15/6956:
 > > [  250.496020]  #0:  (&(&new_timer->it_lock)->rlock){-.-...}, at: [<ffffffff81105a10>] exit_itimers+0x50/0x140
 > > [  250.496020]
 > > the dependencies between HARDIRQ-irq-safe lock and the holding lock:
 > > [  250.496020] -> (&(&new_timer->it_lock)->rlock){-.-...} ops: 6221 {
 > > [  250.496020]    IN-HARDIRQ-W at:
 > > [  250.496020]                     [<ffffffff81149e3c>] mark_irqflags+0x7c/0x190
 > > [  250.496020]                     [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.496020]                     [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.496020]                     [<ffffffff83699e79>] _raw_spin_lock_irqsave+0x79/0xc0
 > > [  250.496020]                     [<ffffffff81104ee2>] posix_timer_fn+0x32/0xd0
 > > [  250.496020]                     [<ffffffff8110b25e>] __run_hrtimer+0x27e/0x4d0
 > > [  250.496020]                     [<ffffffff8110c299>] hrtimer_interrupt+0x119/0x220
 > > [  250.496020]                     [<ffffffff81090215>] smp_apic_timer_interrupt+0x85/0xa0
 > > [  250.496020]                     [<ffffffff8369c4af>] apic_timer_interrupt+0x6f/0x80
 > > [  250.496020]                     [<ffffffff8118ec1e>] rcu_lockdep_current_cpu_online+0x6e/0xa0
 > > [  250.496020]                     [<ffffffff812a57be>] proc_sys_compare+0x7e/0x130
 > > [  250.496020]                     [<ffffffff8124a09c>] __d_lookup+0x18c/0x2e0
 > > [  250.496020]                     [<ffffffff8123d216>] lookup_fast+0x136/0x240
 > > [  250.496020]                     [<ffffffff8123da1c>] link_path_walk+0x22c/0x8f0
 > > [  250.496020]                     [<ffffffff8123e137>] path_lookupat+0x57/0x720
 > > [  250.496020]                     [<ffffffff8123e82c>] do_path_lookup+0x2c/0xc0
 > > [  250.496020]                     [<ffffffff8123ee14>] user_path_at_empty+0x64/0xa0
 > > [  250.496020]                     [<ffffffff8123ee5c>] user_path_at+0xc/0x10
 > > [  250.496020]                     [<ffffffff8122e6be>] sys_chdir+0x1e/0x70
 > > [  250.496020]                     [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
 > > [  250.496020]    IN-SOFTIRQ-W at:
 > > [  250.496020]                     [<ffffffff81149e67>] mark_irqflags+0xa7/0x190
 > > [  250.496020]                     [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.496020]                     [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.496020]                     [<ffffffff83699e79>] _raw_spin_lock_irqsave+0x79/0xc0
 > > [  250.496020]                     [<ffffffff81104ee2>] posix_timer_fn+0x32/0xd0
 > > [  250.496020]                     [<ffffffff8110b25e>] __run_hrtimer+0x27e/0x4d0
 > > [  250.496020]                     [<ffffffff8110c299>] hrtimer_interrupt+0x119/0x220
 > > [  250.561155]                     [<ffffffff81090215>] smp_apic_timer_interrupt+0x85/0xa0
 > > [  250.561155]                     [<ffffffff8369c4af>] apic_timer_interrupt+0x6f/0x80
 > > [  250.561155]                     [<ffffffff81190d27>] rcu_start_gp+0x467/0x500
 > > [  250.561155]                     [<ffffffff811932c3>] rcu_report_qs_rsp+0x223/0x290
 > > [  250.561155]                     [<ffffffff81193581>] rcu_report_qs_rnp+0x251/0x2b0
 > > [  250.561155]                     [<ffffffff8119543b>] rcu_check_quiescent_state+0x9b/0xc0
 > > [  250.561155]                     [<ffffffff811954e6>] __rcu_process_callbacks+0x86/0xe0
 > > [  250.561155]                     [<ffffffff81195618>] rcu_process_callbacks+0xd8/0x210
 > > [  250.561155]                     [<ffffffff810e1b95>] __do_softirq+0x1c5/0x450
 > > [  250.561155]                     [<ffffffff810e1f25>] run_ksoftirqd+0x105/0x250
 > > [  250.561155]                     [<ffffffff8110607d>] kthread+0xad/0xc0
 > > [  250.561155]                     [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
 > > [  250.561155]    INITIAL USE at:
 > > [  250.561155]                    [<ffffffff8114c0dc>] __lock_acquire+0x95c/0xb60
 > > [  250.561155]                    [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]                    [<ffffffff83699e79>] _raw_spin_lock_irqsave+0x79/0xc0
 > > [  250.561155]                    [<ffffffff81104bb7>] __lock_timer+0xa7/0x1a0
 > > [  250.561155]                    [<ffffffff81105662>] sys_timer_getoverrun+0x12/0x50
 > > [  250.561155]                    [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
 > > [  250.561155]  }
 > > [  250.561155]  ... key      at: [<ffffffff8536f7a0>] __key.29517+0x0/0x8
 > > [  250.561155]  ... acquired at:
 > > [  250.561155]    [<ffffffff8114886d>] check_usage+0x1bd/0x1e0
 > > [  250.561155]    [<ffffffff811488fa>] check_irq_usage+0x6a/0xe0
 > > [  250.561155]    [<ffffffff81148abb>] check_prev_add+0x14b/0x640
 > > [  250.561155]    [<ffffffff8114906a>] check_prevs_add+0xba/0x1a0
 > > [  250.561155]    [<ffffffff811497f0>] validate_chain.isra.22+0x6a0/0x7b0
 > > [  250.561155]    [<ffffffff8114c221>] __lock_acquire+0xaa1/0xb60
 > > [  250.561155]    [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]    [<ffffffff8369a25e>] _raw_read_lock+0x3e/0x80
 > > [  250.561155]    [<ffffffff811089da>] posix_cpu_timer_del+0x2a/0x110
 > > [  250.561155]    [<ffffffff81105a8d>] exit_itimers+0xcd/0x140
 > > [  250.561155]    [<ffffffff810deea8>] do_exit+0x1b8/0x580
 > > [  250.561155]    [<ffffffff810df33a>] do_group_exit+0x8a/0xc0
 > > [  250.561155]    [<ffffffff810df382>] sys_exit_group+0x12/0x20
 > > [  250.561155]    [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
 > > [  250.561155]
 > > [  250.561155]
 > > [  250.561155] the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock:
 > > [  250.561155]  -> (&(&p->alloc_lock)->rlock){+.+...} ops: 921205 {
 > > [  250.561155]     HARDIRQ-ON-W at:
 > > [  250.561155]                       [<ffffffff81149ec0>] mark_irqflags+0x100/0x190
 > > [  250.561155]                       [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.561155]                       [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]                       [<ffffffff83699dcb>] _raw_spin_lock+0x3b/0x70
 > > [  250.561155]                       [<ffffffff81237ed1>] set_task_comm+0x31/0x1c0
 > > [  250.561155]                       [<ffffffff8110665c>] kthreadd+0x2c/0x170
 > > [  250.561155]                       [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
 > > [  250.561155]     SOFTIRQ-ON-W at:
 > > [  250.561155]                       [<ffffffff81149ee3>] mark_irqflags+0x123/0x190
 > > [  250.561155]                       [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.561155]                       [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]                       [<ffffffff83699dcb>] _raw_spin_lock+0x3b/0x70
 > > [  250.561155]                       [<ffffffff81237ed1>] set_task_comm+0x31/0x1c0
 > > [  250.561155]                       [<ffffffff8110665c>] kthreadd+0x2c/0x170
 > > [  250.561155]                       [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
 > > [  250.561155]     INITIAL USE at:
 > > [  250.561155]                      [<ffffffff8114c0dc>] __lock_acquire+0x95c/0xb60
 > > [  250.561155]                      [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]                      [<ffffffff83699dcb>] _raw_spin_lock+0x3b/0x70
 > > [  250.561155]                      [<ffffffff81237ed1>] set_task_comm+0x31/0x1c0
 > > [  250.561155]                      [<ffffffff8110665c>] kthreadd+0x2c/0x170
 > > [  250.561155]                      [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
 > > [  250.561155]   }
 > > [  250.561155]   ... key      at: [<ffffffff8532b228>] __key.45219+0x0/0x8
 > > [  250.561155]   ... acquired at:
 > > [  250.561155]    [<ffffffff8114906a>] check_prevs_add+0xba/0x1a0
 > > [  250.561155]    [<ffffffff811497f0>] validate_chain.isra.22+0x6a0/0x7b0
 > > [  250.561155]    [<ffffffff8114c221>] __lock_acquire+0xaa1/0xb60
 > > [  250.561155]    [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]    [<ffffffff83699dcb>] _raw_spin_lock+0x3b/0x70
 > > [  250.561155]    [<ffffffff8189c7e5>] keyctl_session_to_parent+0x105/0x3f0
 > > [  250.561155]    [<ffffffff8189cc25>] sys_keyctl+0x155/0x1a0
 > > [  250.561155]    [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
 > > [  250.561155]
 > > [  250.561155] -> (tasklist_lock){.+.+..} ops: 81487 {
 > > [  250.561155]    HARDIRQ-ON-R at:
 > > [  250.561155]                     [<ffffffff81149e8c>] mark_irqflags+0xcc/0x190
 > > [  250.561155]                     [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.561155]                     [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]                     [<ffffffff8369a25e>] _raw_read_lock+0x3e/0x80
 > > [  250.561155]                     [<ffffffff810de1b8>] do_wait+0x178/0x3b0
 > > [  250.561155]                     [<ffffffff810df64b>] sys_wait4+0xbb/0xe0
 > > [  250.561155]                     [<ffffffff810f81b0>] wait_for_helper+0x80/0xa0
 > > [  250.561155]                     [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
 > > [  250.561155]    SOFTIRQ-ON-R at:
 > > [  250.561155]                     [<ffffffff81149ee3>] mark_irqflags+0x123/0x190
 > > [  250.561155]                     [<ffffffff8114c0b6>] __lock_acquire+0x936/0xb60
 > > [  250.561155]                     [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]                     [<ffffffff8369a25e>] _raw_read_lock+0x3e/0x80
 > > [  250.561155]                     [<ffffffff810de1b8>] do_wait+0x178/0x3b0
 > > [  250.561155]                     [<ffffffff810df64b>] sys_wait4+0xbb/0xe0
 > > [  250.561155]                     [<ffffffff810f81b0>] wait_for_helper+0x80/0xa0
 > > [  250.561155]                     [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
 > > [  250.561155]    INITIAL USE at:
 > > [  250.561155]                    [<ffffffff8114c0dc>] __lock_acquire+0x95c/0xb60
 > > [  250.561155]                    [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]                    [<ffffffff8369a859>] _raw_write_lock_irq+0x59/0x90
 > > [  250.561155]                    [<ffffffff810d686d>] copy_process+0xb0d/0x11a0
 > > [  250.561155]                    [<ffffffff810d7034>] do_fork+0x104/0x3d0
 > > [  250.561155]                    [<ffffffff81074451>] kernel_thread+0x71/0x80
 > > [  250.561155]                    [<ffffffff834f4bed>] rest_init+0x21/0x144
 > > [  250.561155]                    [<ffffffff850cbc24>] start_kernel+0x378/0x385
 > > [  250.561155]                    [<ffffffff850cb397>] x86_64_start_reservations+0x101/0x105
 > > [  250.561155]                    [<ffffffff850cb480>] x86_64_start_kernel+0xe5/0xf4
 > > [  250.561155]  }
 > > [  250.561155]  ... key      at: [<ffffffff8481e018>] tasklist_lock+0x18/0x80
 > > [  250.561155]  ... acquired at:
 > > [  250.561155]    [<ffffffff8114886d>] check_usage+0x1bd/0x1e0
 > > [  250.561155]    [<ffffffff811488fa>] check_irq_usage+0x6a/0xe0
 > > [  250.561155]    [<ffffffff81148abb>] check_prev_add+0x14b/0x640
 > > [  250.561155]    [<ffffffff8114906a>] check_prevs_add+0xba/0x1a0
 > > [  250.561155]    [<ffffffff811497f0>] validate_chain.isra.22+0x6a0/0x7b0
 > > [  250.561155]    [<ffffffff8114c221>] __lock_acquire+0xaa1/0xb60
 > > [  250.561155]    [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]    [<ffffffff8369a25e>] _raw_read_lock+0x3e/0x80
 > > [  250.561155]    [<ffffffff811089da>] posix_cpu_timer_del+0x2a/0x110
 > > [  250.561155]    [<ffffffff81105a8d>] exit_itimers+0xcd/0x140
 > > [  250.561155]    [<ffffffff810deea8>] do_exit+0x1b8/0x580
 > > [  250.561155]    [<ffffffff810df33a>] do_group_exit+0x8a/0xc0
 > > [  250.561155]    [<ffffffff810df382>] sys_exit_group+0x12/0x20
 > > [  250.561155]    [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
 > > [  250.561155]
 > > [  250.561155]
 > > [  250.561155] stack backtrace:
 > > [  250.561155] Pid: 6956, comm: trinity-child15 Tainted: G        W    3.5.0-sasha-01646-g39c0dda #269
 > > [  250.561155] Call Trace:
 > > [  250.561155]  [<ffffffff8114868a>] print_bad_irq_dependency+0x2ea/0x310
 > > [  250.561155]  [<ffffffff8114886d>] check_usage+0x1bd/0x1e0
 > > [  250.561155]  [<ffffffff8109cc55>] ? pvclock_clocksource_read+0x55/0xe0
 > > [  250.561155]  [<ffffffff811488fa>] check_irq_usage+0x6a/0xe0
 > > [  250.561155]  [<ffffffff81148abb>] check_prev_add+0x14b/0x640
 > > [  250.561155]  [<ffffffff8109cc55>] ? pvclock_clocksource_read+0x55/0xe0
 > > [  250.561155]  [<ffffffff8114906a>] check_prevs_add+0xba/0x1a0
 > > [  250.561155]  [<ffffffff81071a15>] ? sched_clock+0x15/0x20
 > > [  250.561155]  [<ffffffff811497f0>] validate_chain.isra.22+0x6a0/0x7b0
 > > [  250.561155]  [<ffffffff8114c221>] __lock_acquire+0xaa1/0xb60
 > > [  250.561155]  [<ffffffff8114c245>] ? __lock_acquire+0xac5/0xb60
 > > [  250.561155]  [<ffffffff8369a0ac>] ? _raw_spin_unlock_irqrestore+0x7c/0xa0
 > > [  250.561155]  [<ffffffff8114e75a>] lock_acquire+0x1ca/0x270
 > > [  250.561155]  [<ffffffff811089da>] ? posix_cpu_timer_del+0x2a/0x110
 > > [  250.561155]  [<ffffffff8114dfde>] ? __lock_acquired+0x2ce/0x360
 > > [  250.561155]  [<ffffffff81105a10>] ? exit_itimers+0x50/0x140
 > > [  250.561155]  [<ffffffff8369a25e>] _raw_read_lock+0x3e/0x80
 > > [  250.561155]  [<ffffffff811089da>] ? posix_cpu_timer_del+0x2a/0x110
 > > [  250.561155]  [<ffffffff811089da>] posix_cpu_timer_del+0x2a/0x110
 > > [  250.561155]  [<ffffffff81105a8d>] exit_itimers+0xcd/0x140
 > > [  250.561155]  [<ffffffff810deea8>] do_exit+0x1b8/0x580
 > > [  250.561155]  [<ffffffff810df33a>] do_group_exit+0x8a/0xc0
 > > [  250.561155]  [<ffffffff810df382>] sys_exit_group+0x12/0x20
 > > [  250.561155]  [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
---end quoted text---
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