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WARNING: bad unlock balance in migration_cpu_stop

Status: public: reported C repro on 2019/04/11 00:00
Reported-by: syzbot+6f0dc342c4fbc8394767@syzkaller.appspotmail.com
First crash: 2109d, last: 2098d

Sample crash report:
=====================================
WARNING: bad unlock balance detected!
4.14.103+ #18 Not tainted
-------------------------------------
migration/1/16 is trying to release lock (&rq->lock) at:
[<ffffffffb856e29d>] migration_cpu_stop+0x2dd/0x430 kernel/sched/core.c:1036
but there are no more locks to release!

other info that might help us debug this:
1 lock held by migration/1/16:
 #0:  (&p->pi_lock){-.-.}, at: [<ffffffffb856e0a1>] migration_cpu_stop+0xe1/0x430 kernel/sched/core.c:1027

stack backtrace:
CPU: 1 PID: 16 Comm: migration/1 Not tainted 4.14.103+ #18
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x10e lib/dump_stack.c:53
 print_unlock_imbalance_bug kernel/locking/lockdep.c:3548 [inline]
 print_unlock_imbalance_bug.cold+0x110/0x11f kernel/locking/lockdep.c:3525

Crashes (617):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/02/25 08:23 android-4.14 6bdf39bb26fd 7a06e792 .config console log report syz C ci-android-414-kasan-gce-root
2019/02/19 19:12 android-4.14 4a739e3530cc 4df543c9 .config console log report syz C ci-android-414-kasan-gce-root
2019/02/15 03:03 android-4.14 bfc525947c56 76dd003f .config console log report syz C ci-android-414-kasan-gce-root
2019/02/25 12:20 android-4.14 6bdf39bb26fd a70141bf .config console log report syz ci-android-414-kasan-gce-root
2019/02/25 01:03 android-4.14 6bdf39bb26fd 7a06e792 .config console log report syz ci-android-414-kasan-gce-root
2019/02/24 15:01 android-4.14 6bdf39bb26fd 7a06e792 .config console log report syz ci-android-414-kasan-gce-root
2019/02/24 12:07 android-4.14 6bdf39bb26fd 7a06e792 .config console log report syz ci-android-414-kasan-gce-root
2019/02/24 09:56 android-4.14 6bdf39bb26fd 7a06e792 .config console log report syz ci-android-414-kasan-gce-root
2019/02/24 00:50 android-4.14 6bdf39bb26fd 7a06e792 .config console log report syz ci-android-414-kasan-gce-root
2019/02/23 14:15 android-4.14 6bdf39bb26fd 18107ce0 .config console log report syz ci-android-414-kasan-gce-root
2019/02/23 10:33 android-4.14 01709c953f89 18107ce0 .config console log report syz ci-android-414-kasan-gce-root
2019/02/22 09:40 android-4.14 01709c953f89 7ff74a98 .config console log report syz ci-android-414-kasan-gce-root
2019/02/21 23:46 android-4.14 01709c953f89 7ff74a98 .config console log report syz ci-android-414-kasan-gce-root
2019/02/21 15:09 android-4.14 01709c953f89 3133098b .config console log report syz ci-android-414-kasan-gce-root
2019/02/21 13:06 android-4.14 01709c953f89 3133098b .config console log report syz ci-android-414-kasan-gce-root
2019/02/20 05:25 android-4.14 af9864a5122f 4df543c9 .config console log report syz ci-android-414-kasan-gce-root
2019/02/19 06:43 android-4.14 4a739e3530cc 59f36113 .config console log report syz ci-android-414-kasan-gce-root
2019/02/18 19:55 android-4.14 4a739e3530cc 59f36113 .config console log report syz ci-android-414-kasan-gce-root
2019/02/18 07:27 android-4.14 4a739e3530cc 59f36113 .config console log report syz ci-android-414-kasan-gce-root
2019/02/18 04:50 android-4.14 4a739e3530cc 59f36113 .config console log report syz ci-android-414-kasan-gce-root
2019/02/17 22:56 android-4.14 4a739e3530cc 3e98cc30 .config console log report syz ci-android-414-kasan-gce-root
2019/02/17 21:29 android-4.14 4a739e3530cc 3e98cc30 .config console log report syz ci-android-414-kasan-gce-root
2019/02/17 18:59 android-4.14 4a739e3530cc 3e98cc30 .config console log report syz ci-android-414-kasan-gce-root
2019/02/17 10:41 android-4.14 4a739e3530cc f42dee6d .config console log report syz ci-android-414-kasan-gce-root
2019/02/17 03:07 android-4.14 4a739e3530cc f42dee6d .config console log report syz ci-android-414-kasan-gce-root
2019/02/17 00:02 android-4.14 4a739e3530cc f42dee6d .config console log report syz ci-android-414-kasan-gce-root
2019/02/15 09:06 android-4.14 6142833f8318 76dd003f .config console log report syz ci-android-414-kasan-gce-root
2019/02/15 04:45 android-4.14 bfc525947c56 76dd003f .config console log report syz ci-android-414-kasan-gce-root
2019/02/15 02:40 android-4.14 bfc525947c56 76dd003f .config console log report syz ci-android-414-kasan-gce-root
2019/02/14 22:55 android-4.14 bfc525947c56 76dd003f .config console log report syz ci-android-414-kasan-gce-root
2019/02/14 22:39 android-4.14 bfc525947c56 76dd003f .config console log report syz ci-android-414-kasan-gce-root
2019/02/14 20:44 android-4.14 bfc525947c56 76dd003f .config console log report syz ci-android-414-kasan-gce-root
2019/02/25 17:29 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 16:28 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 15:03 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 13:58 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 12:30 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 12:15 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 11:08 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 09:33 android-4.14 6bdf39bb26fd a70141bf .config console log report ci-android-414-kasan-gce-root
2019/02/25 06:49 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/25 05:01 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/25 03:18 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/25 00:11 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 22:15 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 20:34 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 16:46 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 13:07 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 11:11 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 08:40 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 08:28 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 07:00 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 05:50 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 04:46 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 03:06 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 02:56 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 01:53 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/24 00:19 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/23 23:02 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/23 21:05 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/23 19:56 android-4.14 6bdf39bb26fd 7a06e792 .config console log report ci-android-414-kasan-gce-root
2019/02/23 18:06 android-4.14 6bdf39bb26fd 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/23 16:47 android-4.14 6bdf39bb26fd 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/23 15:45 android-4.14 6bdf39bb26fd 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/23 13:40 android-4.14 6bdf39bb26fd 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/23 12:39 android-4.14 6bdf39bb26fd 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/23 11:36 android-4.14 6bdf39bb26fd 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/23 09:31 android-4.14 01709c953f89 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/23 08:25 android-4.14 01709c953f89 18107ce0 .config console log report ci-android-414-kasan-gce-root
2019/02/22 22:39 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/22 22:01 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/22 20:59 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/22 19:49 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/22 18:04 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/22 16:54 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/22 15:41 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/22 14:51 android-4.14 01709c953f89 6a5fcca4 .config console log report ci-android-414-kasan-gce-root
2019/02/14 17:58 android-4.14 bfc525947c56 76dd003f .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.