------------[ cut here ]------------
WARNING: CPU: 1 PID: 8930 at drivers/dma-buf/dma-buf.c:1039 dma_buf_vunmap+0x18d/0x200 drivers/dma-buf/dma-buf.c:1039
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8930 Comm: syz-executor.1 Not tainted 4.14.171-syzkaller #0
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+0x142/0x197 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x2f/0x2f kernel/panic.c:547
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:dma_buf_vunmap+0x18d/0x200 drivers/dma-buf/dma-buf.c:1039
RSP: 0018:ffff888051ecfbb8 EFLAGS: 00010297
RAX: ffff8880a0d940c0 RBX: 0000000000000000 RCX: 1ffff11013cded22
RDX: 0000000000000000 RSI: ffffc9001335d000 RDI: 0000000000000000
RBP: ffff888051ecfbe0 R08: dffffc0000000000 R09: ffffffff89563418
R10: ffff888051ecfcd0 R11: ffff8880a0d940c0 R12: ffffc9001335d000
R13: ffffc9001335d000 R14: ffff8880917c35a8 R15: ffff888075edcf00
 vb2_vmalloc_detach_dmabuf+0x5e/0x90 drivers/media/v4l2-core/videobuf2-vmalloc.c:407
 __vb2_plane_dmabuf_put.isra.0+0x10d/0x2f0 drivers/media/v4l2-core/videobuf2-core.c:273
 __vb2_buf_dmabuf_put drivers/media/v4l2-core/videobuf2-core.c:289 [inline]
 __vb2_free_mem drivers/media/v4l2-core/videobuf2-core.c:411 [inline]
 __vb2_queue_free+0x60a/0x7d0 drivers/media/v4l2-core/videobuf2-core.c:454
 vb2_core_queue_release+0x64/0x80 drivers/media/v4l2-core/videobuf2-core.c:2043
 vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline]
 _vb2_fop_release+0x1cf/0x2a0 drivers/media/v4l2-core/videobuf2-v4l2.c:840
 vb2_fop_release+0x75/0xc0 drivers/media/v4l2-core/videobuf2-v4l2.c:854
 vivid_fop_release+0x180/0x3f0 drivers/media/platform/vivid/vivid-core.c:486
 v4l2_release+0xf9/0x190 drivers/media/v4l2-core/v4l2-dev.c:446
 __fput+0x275/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x114/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x415fc1
RSP: 002b:00007ffdf1962ff0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000415fc1
RDX: 0000001b2bf20000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000006e783fbb R09: 000000006e783fbf
R10: 00007ffdf19630d0 R11: 0000000000000293 R12: 000000000076bf20
R13: 0000000000770908 R14: 000000000002f6f4 R15: 000000000076bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..