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BUG: KCSAN: data-race in hrtimer_interrupt / print_tickdevice

write to 0xffff888237c179e0 of 8 bytes by interrupt on cpu 0:
 hrtimer_interrupt+0x6b/0x810 kernel/time/hrtimer.c:2194
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x32/0x80 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674

read to 0xffff888237c179e0 of 8 bytes by task 21505 on cpu 1:
 print_tickdevice+0x144/0x340 kernel/time/timer_list.c:200
 timer_list_show+0x6c/0x170 kernel/time/timer_list.c:292
 seq_read_iter+0x5f6/0x8f0 fs/seq_file.c:273
 proc_reg_read_iter+0x110/0x180 fs/proc/inode.c:299
 io_iter_do_read io_uring/rw.c:835 [inline]
 __io_read+0x44e/0xbd0 io_uring/rw.c:952
 io_read+0x4a/0x190 io_uring/rw.c:1031
 __io_issue_sqe+0xfd/0x2e0 io_uring/io_uring.c:1395
 io_issue_sqe+0x1e7/0xb80 io_uring/io_uring.c:1418
 io_queue_sqe io_uring/io_uring.c:1649 [inline]
 io_req_task_submit+0x46/0xa0 io_uring/io_uring.c:1058
 tctx_task_work_run+0x3a9/0x500 io_uring/tw.c:96
 tctx_task_work+0x3f/0x60 io_uring/tw.c:133
 task_work_run+0x130/0x1a0 kernel/task_work.c:233
 get_signal+0xdc1/0xf10 kernel/signal.c:2810
 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x15d/0x8c0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x23c/0x3c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000546b1c5d1d -> 0x000000546b1eac2e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 21505 Comm: syz.6.6911 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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