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BUG: KCSAN: data-race in handle_irq_event / synchronize_irq

write to 0xffff88812bce5600 of 4 bytes by interrupt on cpu 1:
 irqd_clear kernel/irq/internals.h:225 [inline]
 handle_irq_event+0x10e/0x140 kernel/irq/handle.c:216
 handle_edge_irq+0x18e/0x5f0 kernel/irq/chip.c:819
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 handle_irq arch/x86/kernel/irq.c:230 [inline]
 __common_interrupt arch/x86/kernel/irq.c:249 [inline]
 common_interrupt+0x129/0x1e0 arch/x86/kernel/irq.c:239
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:572

read to 0xffff88812bce5600 of 4 bytes by task 9470 on cpu 0:
 irqd_irq_inprogress include/linux/irq.h:344 [inline]
 __synchronize_hardirq kernel/irq/manage.c:51 [inline]
 synchronize_irq+0xa6/0x2e0 kernel/irq/manage.c:132
 serial8250_do_shutdown+0xb8/0x400 drivers/tty/serial/8250/8250_port.c:2447
 serial8250_shutdown+0x37/0x40 drivers/tty/serial/8250/8250_port.c:2493
 uart_port_shutdown drivers/tty/serial/serial_core.c:1706 [inline]
 uart_shutdown+0x286/0x430 drivers/tty/serial/serial_core.c:299
 uart_hangup+0x9e/0x250 drivers/tty/serial/serial_core.c:1673
 __tty_hangup+0x57a/0x610 drivers/tty/tty_io.c:648
 tty_vhangup drivers/tty/tty_io.c:698 [inline]
 tty_ioctl+0x5a1/0xfd0 drivers/tty/tty_io.c:2597
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9470 Comm: syz-executor.5 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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