WARNING in switched_to_dl

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 605e2ec6 ANDROID: cpufreq: times: add /proc/uid_concurrent..
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=15cab28b400000
kernel config: https://syzkaller.appspot.com/x/.config?x=13f9a89fd206e10e
dashboard link: https://syzkaller.appspot.com/bug?extid=a308cdb8b371e3598cfa
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a308cd...@syzkaller.appspotmail.com

netlink: 16 bytes leftover after parsing attributes in process
`syz-executor3'.
netlink: 16 bytes leftover after parsing attributes in process
`syz-executor3'.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1699 at kernel/sched/deadline.c:344
setup_new_dl_entity kernel/sched/deadline.c:344 [inline]
WARNING: CPU: 1 PID: 1699 at kernel/sched/deadline.c:344
switched_to_dl+0x630/0x870 kernel/sched/deadline.c:1861
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 1699 Comm: syz-executor2 Not tainted 4.9.144+ #79
ffff8801cdabfb98 ffffffff81b43b89 ffffffff82a39060 00000000ffffffff
ffffffff82a4a900 0000000000000001 0000000000000009 ffff8801cdabfc58
ffffffff813f7575 0000000041b58ab3 ffffffff82e2e82b ffffffff813f73b6
Call Trace:
[<ffffffff81b43b89>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81b43b89>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff813f7575>] panic+0x1bf/0x39f kernel/panic.c:179
[<ffffffff813f77b2>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
[<ffffffff810dc0bc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
[<ffffffff811e6f20>] setup_new_dl_entity kernel/sched/deadline.c:344
[inline]
[<ffffffff811e6f20>] switched_to_dl+0x630/0x870
kernel/sched/deadline.c:1861
[<ffffffff8116bfe1>] check_class_changed kernel/sched/core.c:959 [inline]
[<ffffffff8116bfe1>] __sched_setscheduler+0x8f1/0x2c30
kernel/sched/core.c:4396
[<ffffffff8117b27c>] sched_setattr kernel/sched/core.c:4449 [inline]
[<ffffffff8117b27c>] SYSC_sched_setattr kernel/sched/core.c:4623 [inline]
[<ffffffff8117b27c>] SyS_sched_setattr+0x24c/0x3c0 kernel/sched/core.c:4602
[<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
[<ffffffff82818cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.