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BUG: KCSAN: data-race in console_unlock / console_unlock

write to 0xffffffff8417c940 of 8 bytes by task 32677 on cpu 1:
 console_unlock+0x570/0xb30 kernel/printk/printk.c:2632
 vprintk_emit+0x125/0x3d0 kernel/printk/printk.c:2174
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2185
 vprintk+0x15a/0x170 kernel/printk/printk_safe.c:392
 printk+0x62/0x87 kernel/printk/printk.c:2216
 __update_ref_ctr+0x1fe/0x220 kernel/events/uprobes.c:393
 update_ref_ctr+0x36f/0x610 kernel/events/uprobes.c:428
 uprobe_write_opcode+0x34c/0x1050 kernel/events/uprobes.c:498
 set_swbp+0x26/0x30
 install_breakpoint+0x3f3/0x4d0 kernel/events/uprobes.c:914
 register_for_each_vma+0x6e7/0x890 kernel/events/uprobes.c:1070
 uprobe_apply+0x8b/0x260 kernel/events/uprobes.c:1230
 uprobe_perf_open kernel/trace/trace_uprobe.c:1316 [inline]
 trace_uprobe_register+0x2b6/0x410 kernel/trace/trace_uprobe.c:1468
 perf_trace_event_open kernel/trace/trace_event_perf.c:186 [inline]
 perf_trace_event_init+0xf8/0x790 kernel/trace/trace_event_perf.c:208
 perf_uprobe_init+0xf5/0x140 kernel/trace/trace_event_perf.c:336
 perf_uprobe_event_init+0xde/0x140 kernel/events/core.c:9875
 perf_try_init_event+0x21a/0x400 kernel/events/core.c:11192
 perf_init_event kernel/events/core.c:11256 [inline]
 perf_event_alloc+0xa60/0x1790 kernel/events/core.c:11547
 __do_sys_perf_event_open kernel/events/core.c:12037 [inline]
 __se_sys_perf_event_open+0x5c7/0x2740 kernel/events/core.c:11929
 __x64_sys_perf_event_open+0x63/0x70 kernel/events/core.c:11929
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff8417c940 of 8 bytes by task 32678 on cpu 0:
 console_unlock+0x9f5/0xb30 kernel/printk/printk.c:2667
 do_con_write+0x5d29/0x5d90 drivers/tty/vt/vt.c:270
 con_put_char+0x35/0x60 drivers/tty/vt/vt.c:3263
 tty_put_char+0x5f/0xa0 drivers/tty/tty_io.c:3173
 do_output_char+0x4ca/0x4f0 drivers/tty/n_tty.c:485
 process_output drivers/tty/n_tty.c:511 [inline]
 n_tty_write+0x7f8/0xaf0 drivers/tty/n_tty.c:2300
 do_tty_write drivers/tty/tty_io.c:1038 [inline]
 file_tty_write+0x409/0x660 drivers/tty/tty_io.c:1110
 tty_write+0x24/0x30 drivers/tty/tty_io.c:1131
 call_write_iter include/linux/fs.h:2114 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_writev fs/read_write.c:939 [inline]
 do_writev+0x1e0/0x400 fs/read_write.c:982
 __do_sys_writev fs/read_write.c:1055 [inline]
 __se_sys_writev fs/read_write.c:1052 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1052
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000000000000486b -> 0x000000000000486c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 32678 Comm: syz-executor.0 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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