WARNING: CPU: 0 PID: 28673 at fs/ext4/page-io.c:206 ext4_add_complete_io fs/ext4/page-io.c:206 [inline]
WARNING: CPU: 0 PID: 28673 at fs/ext4/page-io.c:206 ext4_put_io_end_defer+0x438/0x590 fs/ext4/page-io.c:269
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 28673 Comm: syz-executor1 Not tainted 4.19.0-rc2-next-20180904+ #55
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+0x1c9/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:996
RIP: 0010:ext4_add_complete_io fs/ext4/page-io.c:206 [inline]
RIP: 0010:ext4_put_io_end_defer+0x438/0x590 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 5e 01 00 00 49 83 bf e0 02 00 00 00 0f 84 dc fd ff ff e8 58 6e 64 ff <0f> 0b e9 d0 fd ff ff e8 0c 8a a3 ff e9 85 fc ff ff 48 89 b5 20 ff
RSP: 0018:ffff8801db0070f0 EFLAGS: 00010006
RAX: ffff88019fa92040 RBX: ffff880162a475a0 RCX: ffffffff821864f7
RDX: 0000000000010000 RSI: ffffffff82186818 RDI: ffff8801cb4b49e0
RBP: ffff8801db0071e0 R08: ffff88019fa92040 R09: ffffed002c548eb9
R10: ffffed002c548eb9 R11: ffff880162a475cf R12: 1ffff1003b600e23
R13: ffff8801a35551f0 R14: ffff8801db0071b8 R15: ffff8801cb4b4700
 ext4_end_bio+0x243/0x6e0 fs/ext4/page-io.c:335
 bio_endio+0x5a6/0xab0 block/bio.c:1774
 req_bio_endio block/blk-core.c:277 [inline]
 blk_update_request+0x3ab/0xc40 block/blk-core.c:3101
 scsi_end_request+0xde/0x890 drivers/scsi/scsi_lib.c:673
 scsi_io_completion+0x26b/0x1ba0 drivers/scsi/scsi_lib.c:1093
 scsi_finish_command+0x54a/0x8f0 drivers/scsi/scsi.c:248
 scsi_softirq_done+0x3f6/0x4d0 drivers/scsi/scsi_lib.c:1737
 __blk_mq_complete_request block/blk-mq.c:583 [inline]
 blk_mq_complete_request+0x359/0x640 block/blk-mq.c:620
 scsi_mq_done+0xef/0x3e0 drivers/scsi/scsi_lib.c:2048
 virtscsi_complete_cmd+0x573/0x740 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+0x128/0x170 drivers/virtio/virtio_ring.c:950
 __handle_irq_event_percpu+0x1c8/0xa50 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+0x20f/0x870 kernel/irq/chip.c:791
 generic_handle_irq_desc include/linux/irqdesc.h:154 [inline]
 handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:78
 do_IRQ+0x80/0x1a0 arch/x86/kernel/irq.c:246
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:645
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:788 [inline]
RIP: 0010:kmem_cache_free+0xb3/0x280 mm/slab.c:3757
Code: 84 f1 00 00 00 41 f7 c5 00 02 00 00 0f 84 c2 00 00 00 e8 b0 27 c7 ff 48 83 3d d0 03 56 06 00 0f 84 bf 01 00 00 4c 89 ef 57 9d <0f> 1f 44 00 00 4c 8b 6d 08 0f 1f 44 00 00 65 8b 05 78 c6 45 7e 89
RSP: 0018:ffff8801921f6208 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
RAX: 0000000000000000 RBX: ffff88019425b240 RCX: 1ffff10033f52519
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff8801921f6228 R08: ffff88019fa92880 R09: 0000000000000006
R10: ffff88019fa92040 R11: 0000000000000000 R12: ffff8801d9ea70c0
R13: 0000000000000286 R14: ffffffff8358f70c R15: 0000000000000001
 bvec_free+0x8c/0xd0 block/bio.c:177
 bio_free+0xc1/0x150 block/bio.c:259
 bio_put+0x187/0x200 block/bio.c:561
 dio_bio_complete+0x5d5/0x890 fs/direct-io.c:562
 dio_await_completion fs/direct-io.c:580 [inline]
 do_blockdev_direct_IO+0x4132/0x9db0 fs/direct-io.c:1388
 __blockdev_direct_IO+0x9d/0xc6 fs/direct-io.c:1417
 ext4_direct_IO_read fs/ext4/inode.c:3832 [inline]
 ext4_direct_IO+0xf1e/0x2000 fs/ext4/inode.c:3864
 generic_file_read_iter+0x515/0x2f20 mm/filemap.c:2341
 ext4_file_read_iter+0x18b/0x3c0 fs/ext4/file.c:77
 call_read_iter include/linux/fs.h:1820 [inline]
 generic_file_splice_read+0x5a5/0x9a0 fs/splice.c:308
 do_splice_to+0x12e/0x190 fs/splice.c:881
 splice_direct_to_actor+0x270/0x8f0 fs/splice.c:953
 do_splice_direct+0x2d4/0x420 fs/splice.c:1062
 do_sendfile+0x62a/0xe20 fs/read_write.c:1440
 __do_sys_sendfile64 fs/read_write.c:1501 [inline]
 __se_sys_sendfile64 fs/read_write.c:1487 [inline]
 __x64_sys_sendfile64+0x1fd/0x250 fs/read_write.c:1487
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7a1ed38c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f7a1ed396d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d4788 R14: 00000000004c8d5e R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..