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Groups > linux.kernel > #1569860
| From | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: mm: deadlock between get_online_cpus/pcpu_alloc |
| Date | 2017-01-30 17:00 +0100 |
| Message-ID | <t5mx4-5LI-17@gated-at.bofh.it> (permalink) |
| References | <t4X5D-752-1@gated-at.bofh.it> <t51LZ-1yV-31@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Sun, Jan 29, 2017 at 6:22 PM, Vlastimil Babka <vbabka@suse.cz> wrote:
> On 29.1.2017 13:44, Dmitry Vyukov wrote:
>> Hello,
>>
>> I've got the following deadlock report while running syzkaller fuzzer
>> on f37208bc3c9c2f811460ef264909dfbc7f605a60:
>>
>> [ INFO: possible circular locking dependency detected ]
>> 4.10.0-rc5-next-20170125 #1 Not tainted
>> -------------------------------------------------------
>> syz-executor3/14255 is trying to acquire lock:
>> (cpu_hotplug.dep_map){++++++}, at: [<ffffffff814271c7>]
>> get_online_cpus+0x37/0x90 kernel/cpu.c:239
>>
>> but task is already holding lock:
>> (pcpu_alloc_mutex){+.+.+.}, at: [<ffffffff81937fee>]
>> pcpu_alloc+0xbfe/0x1290 mm/percpu.c:897
>>
>> which lock already depends on the new lock.
>
> I suspect the dependency comes from recent changes in drain_all_pages(). They
> were later redone (for other reasons, but nice to have another validation) in
> the mmots patch [1], which AFAICS is not yet in mmotm and thus linux-next. Could
> you try if it helps?
It happened only once on linux-next, so I can't verify the fix. But I
will watch out for other occurrences.
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mm: deadlock between get_online_cpus/pcpu_alloc Dmitry Vyukov <dvyukov@google.com> - 2017-01-29 13:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Vlastimil Babka <vbabka@suse.cz> - 2017-01-29 18:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Dmitry Vyukov <dvyukov@google.com> - 2017-01-30 17:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Dmitry Vyukov <dvyukov@google.com> - 2017-02-06 20:20 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-06 23:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 09:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Vlastimil Babka <vbabka@suse.cz> - 2017-02-07 10:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 10:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 11:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 11:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 12:20 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 10:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Vlastimil Babka <vbabka@suse.cz> - 2017-02-07 11:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 11:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 11:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 11:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 12:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 12:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Vlastimil Babka <vbabka@suse.cz> - 2017-02-07 13:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 13:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 13:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Vlastimil Babka <vbabka@suse.cz> - 2017-02-07 13:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 13:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Vlastimil Babka <vbabka@suse.cz> - 2017-02-07 15:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 15:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 15:20 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 16:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 17:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 17:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-07 18:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-07 23:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-08 08:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-08 13:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-08 13:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-08 13:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-08 15:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Peter Zijlstra <peterz@infradead.org> - 2017-02-08 18:00 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-08 15:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-08 16:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-08 17:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-08 19:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-09 04:20 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-09 12:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-09 15:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-09 16:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-09 16:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-09 17:20 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-09 18:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-09 18:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-09 20:20 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-10 19:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-08 18:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Christoph Lameter <cl@linux.com> - 2017-02-08 16:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Tejun Heo <tj@kernel.org> - 2017-02-07 18:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 21:40 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Mel Gorman <mgorman@techsingularity.net> - 2017-02-07 14:10 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 14:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-02-07 12:30 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Michal Hocko <mhocko@kernel.org> - 2017-02-07 09:50 +0100
Re: mm: deadlock between get_online_cpus/pcpu_alloc Thomas Gleixner <tglx@linutronix.de> - 2017-02-07 23:40 +0100
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