WARNING: CPU: 0 PID: 4851 at drivers/staging/android/ion/ion-ioctl.c:63 ion_ioctl+0x1e5/0x210 drivers/staging/android/ion/ion-ioctl.c:63
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4851 Comm: syz-executor4 Not tainted 4.15.0-rc6-next-20180105+ #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x137/0x198 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x249/0x290 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079
RIP: 0010:ion_ioctl+0x1e5/0x210 drivers/staging/android/ion/ion-ioctl.c:63
RSP: 0018:ffff8801c9a0fd30 EFLAGS: 00010212
RAX: 0000000000010000 RBX: 0000000000000018 RCX: ffffffff83ab1ce5
RDX: 000000000000006f RSI: ffffc9000238d000 RDI: ffff8801c9a0fd70
RBP: ffff8801c9a0fdc0 R08: 5af90f921f76b28c R09: ffffed0039341fae
R10: 0000000000000003 R11: ffffed0039341fad R12: 1ffff10039341fa7
R13: 00000000c0184908 R14: ffff8801c9a0fd98 R15: 0000000020eb1000
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x190/0xfe0 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f9d7b863c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000020eb1000 RSI: 00000000c0184908 RDI: 0000000000000013
RBP: 00000000000003fa R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4010
R13: 00000000ffffffff R14: 00007f9d7b8646d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..