XFS (loop5): Invalid superblock magic number
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WARNING: CPU: 1 PID: 21721 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: 21721 Comm: syz-executor.1 Not tainted 4.14.141 #37
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kobject: 'loop0' (ffff8880a8518e60): fill_kobj_path: path = '/devices/virtual/block/loop0'
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x197 lib/dump_stack.c:53
 panic+0x1f2/0x426 kernel/panic.c:182
 __warn.cold+0x2f/0x36 kernel/panic.c:546
 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:ffff8880a10d7920 EFLAGS: 00010216
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90006a13000
RDX: 000000000002d70a RSI: ffffffff8377de9d RDI: 0000000000000000
RBP: ffff8880a10d7948 R08: dffffc0000000000 R09: ffffffff88c8b718
R10: ffff8880a10d7a38 R11: ffff88805e6ce600 R12: ffffc90012b35000
kobject: 'loop2' (ffff8880a4a15720): kobject_uevent_env
R13: ffffc90012b35000 R14: ffff88808addd568 R15: ffff88808ea1c900
 vb2_vmalloc_detach_dmabuf+0x5e/0x90 drivers/media/v4l2-core/videobuf2-vmalloc.c:407
kobject: 'loop2' (ffff8880a4a15720): fill_kobj_path: path = '/devices/virtual/block/loop2'
 __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
kobject: 'loop3' (ffff8880a4a68660): kobject_uevent_env
 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
kobject: 'loop3' (ffff8880a4a68660): fill_kobj_path: path = '/devices/virtual/block/loop3'
 __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
 get_signal+0x18a8/0x1cd0 kernel/signal.c:2220
 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
 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: 0033:0x459879
RSP: 002b:00007f03c528ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000459879
RDX: 0000000020000840 RSI: 00000000c100565c RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f03c528b6d4
R13: 00000000004c49bf R14: 00000000004d8d28 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..