syzbot

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BUG: KCSAN: data-race in console_lock / printk_kthread_func

write to 0xffffffff85c34eb0 of 1 bytes by task 11851 on cpu 0:
 console_kthreads_block kernel/printk/printk.c:318 [inline]
 console_lock+0x65/0xd0 kernel/printk/printk.c:2713
 do_con_write+0x71/0x3590 drivers/tty/vt/vt.c:2908
 con_put_char+0x35/0x60 drivers/tty/vt/vt.c:3303
 tty_put_char+0x5f/0xa0 drivers/tty/tty_io.c:3143
 do_output_char+0x4b6/0x4d0 drivers/tty/n_tty.c:476
 process_output drivers/tty/n_tty.c:501 [inline]
 n_tty_write+0x865/0xb40 drivers/tty/n_tty.c:2309
 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
 call_write_iter include/linux/fs.h:2058 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0x71c/0x890 fs/read_write.c:591
 ksys_write+0xe8/0x1a0 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:653
 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 0xffffffff85c34eb0 of 1 bytes by task 1398 on cpu 1:
 printer_should_wake kernel/printk/printk.c:3731 [inline]
 printk_kthread_func+0x481/0xb60 kernel/printk/printk.c:3795
 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: 1398 Comm: pr/netcon0 Not tainted 5.19.0-rc2-syzkaller-00205-g462abc9de7a1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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