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BUG: KCSAN: data-race in n_tty_receive_char_special / n_tty_receive_char_special

write to 0xffffc90000bd5000 of 8 bytes by task 4548 on cpu 1:
 eraser drivers/tty/n_tty.c:1032 [inline]
 n_tty_receive_char_special+0xd91/0x3ac0 drivers/tty/n_tty.c:1313
 n_tty_receive_buf_standard drivers/tty/n_tty.c:1581 [inline]
 __receive_buf drivers/tty/n_tty.c:1643 [inline]
 n_tty_receive_buf_common+0x191c/0x1e20 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0x2b/0x40 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2315 [inline]
 tty_ioctl+0x968/0x1120 drivers/tty/tty_io.c:2721
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:1055
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffc90000bd5000 of 8 bytes by task 1761 on cpu 0:
 n_tty_receive_char_special+0x398d/0x3ac0 drivers/tty/n_tty.c:1373
 n_tty_receive_buf_standard drivers/tty/n_tty.c:1581 [inline]
 __receive_buf drivers/tty/n_tty.c:1643 [inline]
 n_tty_receive_buf_common+0x191c/0x1e20 drivers/tty/n_tty.c:1740
 n_tty_receive_buf2+0x2e/0x40 drivers/tty/n_tty.c:1775
 tty_ldisc_receive_buf+0x5b/0xf0 drivers/tty/tty_buffer.c:461
 tty_port_default_receive_buf+0x54/0x80 drivers/tty/tty_port.c:39
 receive_buf drivers/tty/tty_buffer.c:481 [inline]
 flush_to_ldisc+0x1c5/0x2c0 drivers/tty/tty_buffer.c:533
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

value changed: 0x0000000000000011 -> 0x0000000000000009

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1761 Comm: kworker/u4:5 Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
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