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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

write to 0xffff888237c197e0 of 8 bytes by interrupt on cpu 0:
 hrtimer_interrupt+0x1fb/0xaf0 kernel/time/hrtimer.c:1803
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x1c0 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x64/0x80 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 kcsan_setup_watchpoint+0x94/0x3f0 kernel/kcsan/core.c:437
 __should_failslab+0x71/0x90 mm/failslab.c:33
 should_failslab+0x5/0x20 mm/slab_common.c:1328
 slab_pre_alloc_hook mm/slab.h:494 [inline]
 slab_alloc mm/slab.c:3306 [inline]
 kmem_cache_alloc+0x4f/0x300 mm/slab.c:3507
 prepare_creds+0x2a/0x430 kernel/cred.c:260
 __sys_setgid+0x5e/0x1a0 kernel/sys.c:435
 __do_sys_setgid kernel/sys.c:461 [inline]
 __se_sys_setgid kernel/sys.c:459 [inline]
 __x64_sys_setgid+0x1a/0x20 kernel/sys.c:459
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237c197e0 of 8 bytes by task 13289 on cpu 1:
 print_cpu+0x32e/0x690 kernel/time/timer_list.c:133
 timer_list_show+0x114/0x180 kernel/time/timer_list.c:291
 traverse+0x150/0x3b0 fs/seq_file.c:111
 seq_lseek+0xab/0x160 fs/seq_file.c:323
 proc_reg_llseek+0xf4/0x160 fs/proc/inode.c:284
 vfs_llseek fs/read_write.c:300 [inline]
 ksys_lseek fs/read_write.c:313 [inline]
 __do_sys_lseek fs/read_write.c:324 [inline]
 __se_sys_lseek fs/read_write.c:322 [inline]
 __x64_sys_lseek+0xf0/0x150 fs/read_write.c:322
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000009adb1ca210 -> 0x0000009adb1e2391

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13289 Comm: syz-executor.2 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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