==================================================================
BUG: KCSAN: data-race in console_lock / printer_should_wake

write to 0xffffffff85bee448 of 1 bytes by task 7893 on cpu 0:
 console_kthreads_block kernel/printk/printk.c:321 [inline]
 console_lock+0x65/0xd0 kernel/printk/printk.c:2716
 con_flush_chars drivers/tty/vt/vt.c:3365 [inline]
 con_write+0x55/0x420 drivers/tty/vt/vt.c:3296
 process_output_block drivers/tty/n_tty.c:581 [inline]
 n_tty_write+0x7ea/0xb40 drivers/tty/n_tty.c:2297
 do_tty_write drivers/tty/tty_io.c:1024 [inline]
 file_tty_write+0x3f9/0x650 drivers/tty/tty_io.c:1095
 tty_write+0x24/0x30 drivers/tty/tty_io.c:1116
 do_iter_readv_writev+0x27b/0x300
 do_iter_write+0x16f/0x5c0 fs/read_write.c:868
 vfs_writev fs/read_write.c:941 [inline]
 do_writev+0x256/0x4b0 fs/read_write.c:984
 __do_sys_writev fs/read_write.c:1057 [inline]
 __se_sys_writev fs/read_write.c:1054 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1054
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffffffff85bee448 of 1 bytes by task 14 on cpu 1:
 printer_should_wake+0x3d/0x1c0 kernel/printk/printk.c:3734
 printk_kthread_func+0x3e5/0x940 kernel/printk/printk.c:3801
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14 Comm: pr/ttyS0 Not tainted 5.19.0-rc3-syzkaller-00027-g78ca55889a54-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================