syzbot

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BUG: KCSAN: data-race in __se_sys_ioctl / __tty_hangup

write to 0xffff88811a27cf08 of 8 bytes by task 36 on cpu 1:
 __tty_hangup+0x1ef/0x540 drivers/tty/tty_io.c:612
 do_tty_hangup+0x1e/0x30 drivers/tty/tty_io.c:663
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88811a27cf08 of 8 bytes by task 6598 on cpu 0:
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xa1/0x140 fs/ioctl.c:584
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:584
 x64_sys_call+0x1816/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffffffff858a1f90 -> 0xffffffff858a1e80

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 6598 Comm: syz.0.1047 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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