syzbot

==================================================================
BUG: KCSAN: data-race in vcs_poll_data_get / vcs_poll_data_get

write to 0xffff888124e74dc8 of 8 bytes by task 26279 on cpu 1:
 vcs_poll_data_get+0x15e/0x170 drivers/tty/vt/vc_screen.c:163
 vcs_poll+0x20/0xe0 drivers/tty/vt/vc_screen.c:714
 vfs_poll include/linux/poll.h:84 [inline]
 do_pollfd fs/select.c:873 [inline]
 do_poll fs/select.c:921 [inline]
 do_sys_poll+0x644/0xc10 fs/select.c:1016
 __do_sys_ppoll fs/select.c:1122 [inline]
 __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1102
 __x64_sys_ppoll+0x67/0x80 fs/select.c:1102
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff888124e74dc8 of 8 bytes by task 26278 on cpu 0:
 vcs_poll_data_get+0x1f/0x170 drivers/tty/vt/vc_screen.c:128
 vcs_poll+0x20/0xe0 drivers/tty/vt/vc_screen.c:714
 vfs_poll include/linux/poll.h:84 [inline]
 do_pollfd fs/select.c:873 [inline]
 do_poll fs/select.c:921 [inline]
 do_sys_poll+0x644/0xc10 fs/select.c:1016
 __do_sys_ppoll fs/select.c:1122 [inline]
 __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1102
 __x64_sys_ppoll+0x67/0x80 fs/select.c:1102
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x0000000000000000 -> 0xffff88815b4bdf00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26278 Comm: syz-executor.1 Not tainted 6.8.0-syzkaller-11743-ga4145ce1e7bc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
==================================================================