XFS (loop1): Invalid superblock magic number
WARNING: CPU: 1 PID: 5594 at fs/ext4/page-io.c:206 ext4_add_complete_io fs/ext4/page-io.c:206 [inline]
WARNING: CPU: 1 PID: 5594 at fs/ext4/page-io.c:206 ext4_put_io_end_defer+0x43c/0x560 fs/ext4/page-io.c:269
Kernel panic - not syncing: panic_on_warn set ...

kobject: 'loop3' (00000000c8a60320): fill_kobj_path: path = '/devices/virtual/block/loop3'
CPU: 1 PID: 5594 Comm: syz-executor0 Not tainted 4.19.0-rc5-next-20180924+ #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 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
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:ext4_add_complete_io fs/ext4/page-io.c:206 [inline]
RIP: 0010:ext4_put_io_end_defer+0x43c/0x560 fs/ext4/page-io.c:269
Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 2a 01 00 00 49 83 bf e0 02 00 00 00 0f 84 d8 fd ff ff e8 94 ab 5c ff <0f> 0b e9 cc fd ff ff e8 58 2e a0 ff e9 81 fc ff ff 48 89 b5 30 ff
RSP: 0000:ffff8801dad070f8 EFLAGS: 00010006
RAX: ffff8801bee70240 RBX: ffff8801c50ff780 RCX: ffffffff8220ab07
RDX: 0000000000010000 RSI: ffffffff8220ae2c RDI: ffff8801c9ff6ea0
RBP: ffff8801dad071e8 R08: ffff8801bee70240 R09: ffffed0038a1fef5
R10: ffffed0038a1fef5 R11: ffff8801c50ff7af R12: 1ffff1003b5a0e24
R13: ffff8801c5340930 R14: ffff8801dad071c0 R15: ffff8801c9ff6bc0
 ext4_end_bio+0x243/0x6e0 fs/ext4/page-io.c:335
 bio_endio+0x5ca/0xb60 block/bio.c:1775
 req_bio_endio block/blk-core.c:277 [inline]
 blk_update_request+0x3b8/0xcb0 block/blk-core.c:3102
 scsi_end_request+0xde/0x860 drivers/scsi/scsi_lib.c:673
 scsi_io_completion+0x2ce/0x1ca0 drivers/scsi/scsi_lib.c:1093
 scsi_finish_command+0x579/0x970 drivers/scsi/scsi.c:248
 scsi_softirq_done+0x465/0x520 drivers/scsi/scsi_lib.c:1737
 __blk_mq_complete_request block/blk-mq.c:583 [inline]
 blk_mq_complete_request+0x3ba/0x680 block/blk-mq.c:620
 scsi_mq_done+0x108/0x460 drivers/scsi/scsi_lib.c:2048
 virtscsi_complete_cmd+0x6b6/0x920 drivers/scsi/virtio_scsi.c:207
 virtscsi_vq_done+0xcb/0x180 drivers/scsi/virtio_scsi.c:223
 virtscsi_req_done+0xa7/0xd0 drivers/scsi/virtio_scsi.c:238
 vring_interrupt+0x139/0x200 drivers/virtio/virtio_ring.c:950
 __handle_irq_event_percpu+0x1e1/0xaf0 kernel/irq/handle.c:149
 handle_irq_event_percpu+0xa0/0x1d0 kernel/irq/handle.c:189
 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
 handle_edge_irq+0x227/0x880 kernel/irq/chip.c:791
 generic_handle_irq_desc include/linux/irqdesc.h:154 [inline]
 handle_irq+0x252/0x3d8 arch/x86/kernel/irq_64.c:78
 do_IRQ+0x98/0x1c0 arch/x86/kernel/irq.c:246
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:582
 </IRQ>
RIP: 0033:0x45a0c7
Code: 44 00 00 b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9d 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd087aa2c8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffffdb
RAX: ffffffffffffffea RBX: 0000000000000000 RCX: 000000000045a0c7
RDX: 0000000000402e60 RSI: 0000000000000002 RDI: 00007ffd087aa370
RBP: 0000000000000237 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000206 R12: 00007ffd087ab3d0
R13: 0000000001456940 R14: 0000000000000000 R15: badc0ffeebadface
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..