From: Thomas Gleixner <tglx@linutronix.de>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Dmitry Vyukov <dvyukov@google.com>,
Kostya Serebryany <kcc@google.com>,
syzkaller <syzkaller@googlegroups.com>,
John Stultz <john.stultz@linaro.org>
Subject: Re: time: hang due to timer_create/timer_settime
Date: Fri, 21 Apr 2017 17:05:57 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1704211704510.1853@nanos> (raw)
In-Reply-To: <CAAeHK+x3bw0hCtwAJ4HxMVNhNdNyvMmh_L4V9pcGMvPLOuoH2Q@mail.gmail.com>
On Fri, 21 Apr 2017, Andrey Konovalov wrote:
> Hi,
>
> I've got the following error report while fuzzing the kernel with syzkaller.
>
> On commit 4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (4.11-rc7).
>
> A reproducer and .config are attached.
>
> The program hangs the kernel.
> lock_acquire+0x22d/0x560 kernel/locking/lockdep.c:3762
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0xc4/0x110 kernel/locking/spinlock.c:159
> alarmtimer_fired+0x169/0x7a0 kernel/time/alarmtimer.c:189
> __run_hrtimer kernel/time/hrtimer.c:1212 [inline]
> __hrtimer_run_queues+0x350/0xe50 kernel/time/hrtimer.c:1276
> hrtimer_interrupt+0x1ab/0x5c0 kernel/time/hrtimer.c:1310
> local_apic_timer_interrupt+0x6f/0xe0 arch/x86/kernel/apic/apic.c:937
> smp_apic_timer_interrupt+0x71/0xa0 arch/x86/kernel/apic/apic.c:961
> apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:487
Right. That lacks the protection which we have in the other posix
timers. I'll have a look.
Thanks,
tglx
next prev parent reply other threads:[~2017-04-21 19:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-21 13:18 Andrey Konovalov
2017-04-21 15:05 ` Thomas Gleixner [this message]
2017-04-21 16:21 ` Thomas Gleixner
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