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SubjectBUG: unable to handle kernel paging request in hrtimer_interrupt
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Hello,

syzbot found the following crash on:

HEAD commit: 29f785ff Merge branch 'fixes' of git://git.kernel.org/pub/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10539ceaa00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e5c77f8090a3b96b
dashboard link: https://syzkaller.appspot.com/bug?extid=037e18398ba8c655a652
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16da8cc9a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+037e18398ba8c655a652@syzkaller.appspotmail.com

kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: ffff88807a92fb10
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0011) - permissions violation
PGD b401067 P4D b401067 PUD 80000000400001e3
Thread overran stack, or stack corrupted
Oops: 0011 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9205 Comm: syz-executor.0 Not tainted 5.2.0-rc5+ #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:0xffff88807a92fb10
Code: ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff ff ff 40 8c f0 89 80
88 ff ff 00 00 00 00 00 00 00 00 a0 a9 1d 8b ff ff ff ff <40> fb 92 7a 80
88 ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff
RSP: 0018:ffff8880ae909e10 EFLAGS: 00010006
RAX: ffff88807a92fb10 RBX: 0000000000000000 RCX: ffffffff816162e2
RDX: 0000000000010000 RSI: ffffffff81615cdf RDI: ffff88807a92fab8
RBP: ffff8880ae909f08 R08: ffff888092914180 R09: ffffed1015d26c70
R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: ffff8880ae926d80
R13: ffffffff8b1da9a0 R14: ffff88807a92fab8 R15: dffffc0000000000
FS: 0000555557401940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88807a92fb10 CR3: 000000009016a000 CR4: 00000000001406e0
Call Trace:
<IRQ>
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1066
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
</IRQ>
Modules linked in:
CR2: ffff88807a92fb10
---[ end trace f7934f1b1fe3f476 ]---
RIP: 0010:0xffff88807a92fb10
Code: ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff ff ff 40 8c f0 89 80
88 ff ff 00 00 00 00 00 00 00 00 a0 a9 1d 8b ff ff ff ff <40> fb 92 7a 80
88 ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff
RSP: 0018:ffff8880ae909e10 EFLAGS: 00010006
RAX: ffff88807a92fb10 RBX: 0000000000000000 RCX: ffffffff816162e2
RDX: 0000000000010000 RSI: ffffffff81615cdf RDI: ffff88807a92fab8
RBP: ffff8880ae909f08 R08: ffff888092914180 R09: ffffed1015d26c70
R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: ffff8880ae926d80
R13: ffffffff8b1da9a0 R14: ffff88807a92fab8 R15: dffffc0000000000
FS: 0000555557401940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88807a92fb10 CR3: 000000009016a000 CR4: 00000000001406e0


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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