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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

write to 0xffff888237d1b8a0 of 8 bytes by interrupt on cpu 1:
 hrtimer_interrupt+0x1ee/0x810 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1f0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705
 link_path_walk+0x47a/0xe30 fs/namei.c:2617
 path_parentat fs/namei.c:2851 [inline]
 __filename_parentat+0x1a4/0x450 fs/namei.c:2875
 filename_parentat fs/namei.c:2893 [inline]
 filename_unlinkat+0x99/0x410 fs/namei.c:5509
 __do_sys_unlink fs/namei.c:5575 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5572
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5572
 x64_sys_call+0x2eb6/0x3020 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d1b8a0 of 8 bytes by task 9582 on cpu 0:
 print_cpu+0x2ea/0x660 kernel/time/timer_list.c:131
 timer_list_show+0x107/0x170 kernel/time/timer_list.c:293
 seq_read_iter+0x31e/0x940 fs/seq_file.c:231
 proc_reg_read_iter+0x110/0x180 fs/proc/inode.c:299
 do_iter_readv_writev+0x4fd/0x5a0 fs/read_write.c:-1
 vfs_readv+0x1f4/0x6e0 fs/read_write.c:1020
 do_preadv fs/read_write.c:1134 [inline]
 __do_sys_preadv fs/read_write.c:1181 [inline]
 __se_sys_preadv fs/read_write.c:1176 [inline]
 __x64_sys_preadv+0xfd/0x1c0 fs/read_write.c:1176
 x64_sys_call+0x2915/0x3020 arch/x86/include/generated/asm/syscalls_64.h:296
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000012e58d07a89 -> 0x0000012e58dccb8b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9582 Comm: syz.0.8821 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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