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Date:   Thu, 02 Nov 2017 09:23:58 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot 
        <bot+63583aefef5457348dcfa06b87d4fd1378b26b09@...kaller.appspotmail.com>,
        aaron.lu@...el.com, alsa-devel@...a-project.org,
        Michal Hocko <mhocko@...e.com>, Jan Kara <jack@...e.cz>,
        Minchan Kim <minchan@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, ying.huang@...el.com,
        syzkaller-bugs@...glegroups.com,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Takashi Iwai <tiwai@...e.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>, shli@...com,
        David Rientjes <rientjes@...gle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        zi.yan@...rutgers.edu, Matthew Wilcox <willy@...ux.intel.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [alsa-devel] BUG: soft lockup

On Wed, 01 Nov 2017 20:57:57 +0100,
Dmitry Vyukov wrote:
> 
> On Wed, Nov 1, 2017 at 10:54 PM, syzbot
> <bot+63583aefef5457348dcfa06b87d4fd1378b26b09@...kaller.appspotmail.com>
> wrote:
> > Hello,
> >
> > syzkaller hit the following crash on
> > 1d53d908b79d7870d89063062584eead4cf83448
> > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
> > compiler: gcc (GCC) 7.1.1 20170620
> > .config is attached
> > Raw console output is attached.
> > C reproducer is attached
> > syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> > for information about syzkaller reproducers
> >
> >
> > watchdog: BUG: soft lockup - CPU#3 stuck for 210s! [syzkaller355698:2995]
> > Modules linked in:
> > irq event stamp: 23090
> > hardirqs last  enabled at (23089): [<ffffffff8155d77c>]
> > __raw_spin_lock_init+0x1c/0x100 kernel/locking/spinlock_debug.c:23
> > hardirqs last disabled at (23090): [<ffffffff84d3eb58>]
> > apic_timer_interrupt+0x98/0xb0 arch/x86/entry/entry_64.S:577
> > softirqs last  enabled at (1838): [<ffffffff84d4496d>]
> > __do_softirq+0x74d/0xbd0 kernel/softirq.c:310
> > softirqs last disabled at (1825): [<ffffffff81415033>] invoke_softirq
> > kernel/softirq.c:364 [inline]
> > softirqs last disabled at (1825): [<ffffffff81415033>] irq_exit+0x1d3/0x210
> > kernel/softirq.c:405
> > CPU: 3 PID: 2995 Comm: syzkaller355698 Not tainted 4.13.0-rc7-next-20170901+
> > #13
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> > task: ffff88006b8fc580 task.stack: ffff880069df8000
> > RIP: 0010:clear_page_rep+0x7/0x10 arch/x86/lib/clear_page_64.S:19
> > RSP: 0000:ffff880069dff6f8 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff10
> > RAX: 0000000000000000 RBX: 0000000000000057 RCX: 0000000000000178
> > RDX: 0000000000000000 RSI: ffff88006b8fc580 RDI: ffff880064657440
> > RBP: ffff880069dff760 R08: 0000000000029190 R09: 0000000000000000
> > R10: ffffffffffffffe8 R11: 0000000000000000 R12: dffffc0000000000
> > R13: ffff88006b8fc580 R14: ffff88006b8fc580 R15: ffff88006b8fc580
> > FS:  0000000000f65880(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 0000000020c67ff1 CR3: 000000006741d000 CR4: 00000000000006e0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > Call Trace:
> >  __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline]
> >  do_huge_pmd_anonymous_page+0x59c/0x1ba0 mm/huge_memory.c:728
> >  create_huge_pmd mm/memory.c:3802 [inline]
> >  __handle_mm_fault+0x1827/0x39c0 mm/memory.c:4005
> >  handle_mm_fault+0x3bb/0x860 mm/memory.c:4071
> >  __do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1445
> >  do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520
> >  do_async_page_fault+0x72/0xc0 arch/x86/kernel/kvm.c:266
> >  async_page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1069
> > RIP: 0033:0x4012c8
> > RSP: 002b:00007ffc12d93e10 EFLAGS: 00010286
> > RAX: ffffffffffffffff RBX: ffffffffffffffff RCX: 0000000000439779
> > RDX: 0000000000000000 RSI: 000000002076e000 RDI: ffffffffffffffff
> > RBP: 00327265636e6575 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000286 R12: 7165732f7665642f
> > R13: 646e732f7665642f R14: 0030656c69662f2e R15: 0000000000000000
> > Code: 60 39 d1 fc e9 8d fd ff ff be 08 00 00 00 4c 89 ff e8 2e 39 d1 fc e9
> > 1c fd ff ff 90 90 90 90 90 90 90 90 90 b9 00 02 00 00 31 c0 <f3> 48 ab c3 0f
> > 1f 44 00 00 31 c0 b9 40 00 00 00 66 0f 1f 84 00
> > Kernel panic - not syncing: softlockup: hung tasks
> > CPU: 3 PID: 2995 Comm: syzkaller355698 Tainted: G             L
> > 4.13.0-rc7-next-20170901+ #13
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> > Call Trace:
> >  <IRQ>
> >  __dump_stack lib/dump_stack.c:16 [inline]
> >  dump_stack+0x194/0x257 lib/dump_stack.c:52
> >  panic+0x1e4/0x417 kernel/panic.c:181
> >  watchdog_timer_fn+0x401/0x410 kernel/watchdog.c:433
> >  __run_hrtimer kernel/time/hrtimer.c:1213 [inline]
> >  __hrtimer_run_queues+0x349/0xe10 kernel/time/hrtimer.c:1277
> >  hrtimer_interrupt+0x1d4/0x5f0 kernel/time/hrtimer.c:1311
> >  local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1021 [inline]
> >  smp_apic_timer_interrupt+0x156/0x710 arch/x86/kernel/apic/apic.c:1046
> >  apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
> >  </IRQ>
> > RIP: 0010:clear_page_rep+0x7/0x10 arch/x86/lib/clear_page_64.S:19
> > RSP: 0000:ffff880069dff6f8 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff10
> > RAX: 0000000000000000 RBX: 0000000000000057 RCX: 0000000000000178
> > RDX: 0000000000000000 RSI: ffff88006b8fc580 RDI: ffff880064657440
> > RBP: ffff880069dff760 R08: 0000000000029190 R09: 0000000000000000
> > R10: ffffffffffffffe8 R11: 0000000000000000 R12: dffffc0000000000
> > R13: ffff88006b8fc580 R14: ffff88006b8fc580 R15: ffff88006b8fc580
> >  __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline]
> >  do_huge_pmd_anonymous_page+0x59c/0x1ba0 mm/huge_memory.c:728
> >  create_huge_pmd mm/memory.c:3802 [inline]
> >  __handle_mm_fault+0x1827/0x39c0 mm/memory.c:4005
> >  handle_mm_fault+0x3bb/0x860 mm/memory.c:4071
> >  __do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1445
> >  do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520
> >  do_async_page_fault+0x72/0xc0 arch/x86/kernel/kvm.c:266
> >  async_page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1069
> > RIP: 0033:0x4012c8
> > RSP: 002b:00007ffc12d93e10 EFLAGS: 00010286
> > RAX: ffffffffffffffff RBX: ffffffffffffffff RCX: 0000000000439779
> > RDX: 0000000000000000 RSI: 000000002076e000 RDI: ffffffffffffffff
> > RBP: 00327265636e6575 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000286 R12: 7165732f7665642f
> > R13: 646e732f7665642f R14: 0030656c69662f2e R15: 0000000000000000
> > Dumping ftrace buffer:
> >    (ftrace buffer empty)
> > Kernel Offset: disabled
> > Rebooting in 86400 seconds..
> 
> 
> Looking at the reproducer it looks more sound-related, so +alsa maintainers.
> This reproducer on linux-next 36ef71cae353f88fd6e095e2aaa3e5953af1685d
> (Oct 20) as well.
> 
> INFO: rcu_sched detected stalls on CPUs/tasks:
> 3-...0: (1 GPs behind) idle=d3e/1/4611686018427387906
> softirq=4046/4046 fqs=31231
> (detected by 2, t=125002 jiffies, g=2422, c=2421, q=5593)
> Sending NMI from CPU 2 to CPUs 3:
> NMI backtrace for cpu 3
> CPU: 3 PID: 3082 Comm: a.out Not tainted 4.14.0-rc5-next-20171018 #15
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> task: ffff880063ed4140 task.stack: ffff880063a98000
> RIP: 0010:snd_timer_user_interrupt+0x68/0x3f0 sound/core/timer.c:1220
> RSP: 0000:ffff88006cb87730 EFLAGS: 00000802
> RAX: 0000000000000000 RBX: ffff8800646727c0 RCX: 0000000000000000
> RDX: 1ffff1000c8ce4fd RSI: 0000000000000001 RDI: ffff8800646727e8
> RBP: ffff88006cb87768 R08: 0000000000000008 R09: 00000000000022df
> R10: ffff880063ed49d8 R11: ffff880063ed4140 R12: dffffc0000000000
> R13: ffff88006b842410 R14: ffff880064672808 R15: 0000000000000001
> FS:  0000000001def880(0000) GS:ffff88006cb80000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000203a2000 CR3: 000000006b29f006 CR4: 00000000001606e0
> Call Trace:
>  <IRQ>
>  snd_timer_interrupt+0xae5/0x1510 sound/core/timer.c:808
>  snd_hrtimer_callback+0x211/0x3b0 sound/core/hrtimer.c:64
>  __run_hrtimer kernel/time/hrtimer.c:1213 [inline]
>  __hrtimer_run_queues+0x38f/0x1000 kernel/time/hrtimer.c:1277
>  hrtimer_interrupt+0x1e2/0x650 kernel/time/hrtimer.c:1311
>  local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
>  smp_apic_timer_interrupt+0x153/0x6d0 arch/x86/kernel/apic/apic.c:1050
>  apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
>  </IRQ>
> RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49
> RSP: 0000:ffff880063a9f680 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff11
> RAX: 0000000000000000 RBX: 0000000000000034 RCX: 0000000000000040
> RDX: ffff880063ed4140 RSI: 0000160000000000 RDI: ffff88005bd78fc0
> RBP: ffff880063a9f6d0 R08: ffff880063ed4140 R09: 0000000000000000
> R10: ffffffffffffffe2 R11: 0000000000000000 R12: dffffc0000000000
> R13: ffffea00016f0000 R14: 0000000000000144 R15: 000000000000005e
>  __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline]
>  do_huge_pmd_anonymous_page+0x8ad/0x1e70 mm/huge_memory.c:728
>  create_huge_pmd mm/memory.c:3828 [inline]
>  __handle_mm_fault+0x261d/0x3eb0 mm/memory.c:4031
>  handle_mm_fault+0x395/0xa10 mm/memory.c:4097
>  __do_page_fault+0x63f/0xff0 arch/x86/mm/fault.c:1438
>  do_page_fault+0xee/0x880 arch/x86/mm/fault.c:1514
>  do_async_page_fault+0x37/0x80 arch/x86/kernel/kvm.c:273
>  async_page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1069
> RIP: 0033:0x427449
> RSP: 002b:00007ffd9a2f3568 EFLAGS: 00010202
> RAX: 00000000203a2000 RBX: 00000000004002c8 RCX: 0030656c69662f2e
> RDX: 0000000000000008 RSI: 000000000049813d RDI: 00000000203a2000
> RBP: 00007ffd9a2f3580 R08: ffffffffffffffff R09: 0000000000000000
> R10: 0000000000000032 R11: 0000000000000246 R12: 0000000000000000
> R13: 00000000004068d0 R14: 0000000000406960 R15: 0000000000000000
> Code: 00 00 48 8b 5b 40 4c 8d 73 48 4c 89 f7 e8 41 32 1b 01 48 8d 7b
> 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 <84>
> c0 74 08 3c 03 0f 8e ed 02 00 00 44 8b 63 28 31 ff 44 89 e6
> 
> 
> I've sampled cpu stacks before stall message and it seems sound
> interrupts happen too frequently:

Currently the least ALSA timer interrupt period is limited to 1ms.
Does it still too much?

Can the reproducer triggers it reliably?  If yes, could you forward
it, too (and config as well), so that I'll try to dig down more exact
code paths?


thanks,

Takashi

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