WARNING: CPU: 1 PID: 11813 at drivers/dma-buf/dma-buf.c:992 dma_buf_vunmap+0x1bb/0x220 drivers/dma-buf/dma-buf.c:992
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 11813 Comm: syz-executor0 Not tainted 4.20.0-rc4+ #353
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
kobject: 'loop4' (000000001917090b): kobject_uevent_env
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
kobject: 'loop4' (000000001917090b): fill_kobj_path: path = '/devices/virtual/block/loop4'
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:dma_buf_vunmap+0x1bb/0x220 drivers/dma-buf/dma-buf.c:992
Code: 00 00 00 00 e8 d6 20 1c fd 4c 89 f7 e8 2e 43 77 03 e8 c9 20 1c fd 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b5 20 1c fd <0f> 0b eb e3 e8 ac 20 1c fd 0f 0b e8 a5 20 1c fd 0f 0b e8 9e 20 1c
RSP: 0018:ffff88818189f350 EFLAGS: 00010216
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900061f0000
RDX: 000000000000039d RSI: ffffffff84636a4b RDI: 0000000000000000
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
RBP: ffff88818189f380 R08: ffff8881c212c5c0 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8881c212c5c0 R12: ffffc90001931000
R13: ffff8881d9b74d80 R14: ffff8881d9b74de8 R15: ffff8881c237e000
 vb2_vmalloc_detach_dmabuf+0x5a/0x80 drivers/media/common/videobuf2/videobuf2-vmalloc.c:406
kobject: 'loop1' (00000000b7dcd27c): kobject_uevent_env
 __vb2_plane_dmabuf_put.isra.5+0x122/0x310 drivers/media/common/videobuf2/videobuf2-core.c:275
 __vb2_buf_dmabuf_put drivers/media/common/videobuf2/videobuf2-core.c:291 [inline]
 __vb2_free_mem drivers/media/common/videobuf2/videobuf2-core.c:415 [inline]
 __vb2_queue_free+0x7f3/0xa30 drivers/media/common/videobuf2/videobuf2-core.c:458
 vb2_core_reqbufs+0x2da/0x1040 drivers/media/common/videobuf2/videobuf2-core.c:694
kobject: 'loop1' (00000000b7dcd27c): fill_kobj_path: path = '/devices/virtual/block/loop1'
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
 vb2_reqbufs+0xf0/0x120 drivers/media/common/videobuf2/videobuf2-v4l2.c:643
 v4l2_m2m_reqbufs+0x90/0x1d0 drivers/media/v4l2-core/v4l2-mem2mem.c:438
 v4l2_m2m_ioctl_reqbufs+0x6b/0x80 drivers/media/v4l2-core/v4l2-mem2mem.c:1009
 v4l_reqbufs+0xae/0xd0 drivers/media/v4l2-core/v4l2-ioctl.c:1884
kobject: 'loop2' (00000000af3cc9d1): kobject_uevent_env
 __video_do_ioctl+0x8b1/0x1050 drivers/media/v4l2-core/v4l2-ioctl.c:2853
kobject: 'loop2' (00000000af3cc9d1): fill_kobj_path: path = '/devices/virtual/block/loop2'
 video_usercopy+0x5c1/0x1760 drivers/media/v4l2-core/v4l2-ioctl.c:3035
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
 video_ioctl2+0x2c/0x33 drivers/media/v4l2-core/v4l2-ioctl.c:3079
 v4l2_ioctl+0x154/0x1b0 drivers/media/v4l2-core/v4l2-dev.c:364
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f772f724c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 00000000200001c0 RSI: 00000000c0145608 RDI: 0000000000000004
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f772f7256d4
R13: 00000000004c1cfa R14: 00000000004d32b0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..