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BUG: KCSAN: data-race in iomap_dio_bio_actor / iomap_dio_bio_end_io

read to 0xffff8880aa8c4924 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
 is_atomic kernel/kcsan/core.c:174 [inline]
 should_watch kernel/kcsan/core.c:203 [inline]
 check_access kernel/kcsan/core.c:458 [inline]
 __tsan_read4+0x8e/0x100 kernel/kcsan/core.c:588
 __should_failslab+0xde/0x130 mm/failslab.c:33
 should_failslab+0x9/0x14 mm/slab_common.c:1810
 slab_pre_alloc_hook mm/slab.h:567 [inline]
 slab_alloc_node mm/slab.c:3227 [inline]
 kmem_cache_alloc_node+0x39/0x660 mm/slab.c:3575
 alloc_vmap_area+0x10a/0x15d0 mm/vmalloc.c:1087
 __get_vm_area_node+0x16f/0x280 mm/vmalloc.c:2095
 __vmalloc_node_range+0xe5/0x4c0 mm/vmalloc.c:2542
 __vmalloc_node mm/vmalloc.c:2607 [inline]
 __vmalloc_node_flags mm/vmalloc.c:2621 [inline]
 vzalloc+0x65/0x80 mm/vmalloc.c:2666
 n_tty_open+0x24/0x100 drivers/tty/n_tty.c:1914
 tty_ldisc_open.isra.0+0x6d/0xb0 drivers/tty/tty_ldisc.c:464
 tty_ldisc_setup+0x6d/0xb0 drivers/tty/tty_ldisc.c:782
 tty_init_dev drivers/tty/tty_io.c:1365 [inline]
 tty_init_dev+0x18d/0x300 drivers/tty/tty_io.c:1318
 ptmx_open drivers/tty/pty.c:845 [inline]
 ptmx_open+0x11a/0x2a0 drivers/tty/pty.c:811
 chrdev_open+0x150/0x380 fs/char_dev.c:414
 do_dentry_open+0x301/0x970 fs/open.c:797
 vfs_open+0x62/0x80 fs/open.c:914
 do_last fs/namei.c:3420 [inline]
 path_openat+0xf9f/0x3580 fs/namei.c:3537
 do_filp_open+0x11e/0x1b0 fs/namei.c:3567
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_openat fs/open.c:1124 [inline]
 __se_sys_openat fs/open.c:1118 [inline]
 __x64_sys_openat+0x62/0x80 fs/open.c:1118
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880aa8c4924 of 4 bytes by task 8446 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: 8446 Comm: syz-executor.1 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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