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BUG: KCSAN: data-race in iomap_dio_bio_actor / iomap_dio_bio_end_io

read to 0xffff8880b32805a4 of 4 bytes by interrupt on cpu 1:
 iomap_dio_bio_end_io+0x4c/0x2b0 fs/iomap/direct-io.c:149
 bio_endio+0x2fa/0x400 block/bio.c:1821
 req_bio_endio block/blk-core.c:245 [inline]
 blk_update_request+0x427/0x7b0 block/blk-core.c:1464
 scsi_end_request+0x6b/0x360 drivers/scsi/scsi_lib.c:576
 scsi_io_completion+0x11d/0xc80 drivers/scsi/scsi_lib.c:960
 scsi_finish_command+0x283/0x380 drivers/scsi/scsi.c:228
 scsi_softirq_done+0x259/0x280 drivers/scsi/scsi_lib.c:1476
 blk_done_softirq+0x1eb/0x250 block/blk-softirq.c:37
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 do_IRQ+0x81/0x130 arch/x86/kernel/irq.c:263
 ret_from_intr+0x0/0x21
 __sctp_v6_cmp_addr+0x6/0x2c0 net/sctp/ipv6.c:564
 sctp_v6_cmp_addr+0x28/0x90 net/sctp/ipv6.c:601
 sctp_bind_addr_state+0xc4/0x150 net/sctp/bind_addr.c:404
 sctp_copy_local_addr_list+0x13a/0x290 net/sctp/protocol.c:161
 sctp_copy_one_addr+0x68/0x150 net/sctp/bind_addr.c:457
 sctp_bind_addr_copy+0xb4/0x238 net/sctp/bind_addr.c:56
 sctp_assoc_set_bind_addr_from_ep+0xf2/0x110 net/sctp/associola.c:1579
 sctp_sf_do_unexpected_init net/sctp/sm_statefuns.c:1533 [inline]
 sctp_sf_do_unexpected_init.isra.0+0x4fb/0xa70 net/sctp/sm_statefuns.c:1441
 sctp_sf_do_5_2_1_siminit+0x3e/0x60 net/sctp/sm_statefuns.c:1670
 sctp_do_sm+0xc2/0x2f10 net/sctp/sm_sideeffect.c:1157
 sctp_assoc_bh_rcv+0x2d7/0x460 net/sctp/associola.c:1045
 sctp_inq_push+0x107/0x1a0 net/sctp/inqueue.c:80
 sctp_backlog_rcv+0x112/0x7d0 net/sctp/input.c:344
 sk_backlog_rcv include/net/sock.h:949 [inline]
 __release_sock+0x135/0x1e0 net/core/sock.c:2437
 release_sock+0x61/0x160 net/core/sock.c:2953
 sctp_wait_for_connect+0x21c/0x330 net/sctp/socket.c:9282
 __sctp_connect+0x5af/0x670 net/sctp/socket.c:1226
 sctp_connect net/sctp/socket.c:4895 [inline]
 sctp_inet_connect+0xd7/0x120 net/sctp/socket.c:4910
 __sys_connect_file+0xf4/0x100 net/socket.c:1844
 __sys_connect+0x121/0x150 net/socket.c:1861
 __do_sys_connect net/socket.c:1872 [inline]
 __se_sys_connect net/socket.c:1869 [inline]
 __x64_sys_connect+0x4c/0x60 net/socket.c:1869
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880b32805a4 of 4 bytes by task 17520 on cpu 0:
 iomap_dio_bio_actor+0x6dc/0x960 fs/iomap/direct-io.c:293
 iomap_dio_actor+0x87/0x3a0 fs/iomap/direct-io.c:382
 iomap_apply+0x20d/0x6a0 fs/iomap/apply.c:80
 iomap_dio_rw+0x67e/0x9a0 fs/iomap/direct-io.c:498
 ext4_dio_write_iter fs/ext4/file.c:438 [inline]
 ext4_file_write_iter+0xc38/0xd40 fs/ext4/file.c:545
 call_write_iter include/linux/fs.h:1902 [inline]
 new_sync_write+0x388/0x4a0 fs/read_write.c:483
 __vfs_write+0xb1/0xc0 fs/read_write.c:496
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0xd5/0x1b0 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x4c/0x60 fs/read_write.c:620
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17520 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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