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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

read-write to 0xffff888237c1f0d4 of 4 bytes by interrupt on cpu 0:
 hrtimer_interrupt+0x6f/0x7b0 kernel/time/hrtimer.c:1792
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x52/0x190 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x6a/0x80 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:705
 jbd2__journal_start+0x23b/0x3e0 fs/jbd2/transaction.c:529
 __ext4_journal_start_sb+0xd5/0x330 fs/ext4/ext4_jbd2.c:112
 __ext4_new_inode+0xdd4/0x2270 fs/ext4/ialloc.c:1078
 ext4_symlink+0x242/0x590 fs/ext4/namei.c:3396
 vfs_symlink+0xc2/0x1a0 fs/namei.c:4480
 do_symlinkat+0xe3/0x340 fs/namei.c:4506
 __do_sys_symlinkat fs/namei.c:4522 [inline]
 __se_sys_symlinkat fs/namei.c:4519 [inline]
 __x64_sys_symlinkat+0x62/0x70 fs/namei.c:4519
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237c1f0d4 of 4 bytes by task 7000 on cpu 1:
 print_cpu+0x348/0x640 kernel/time/timer_list.c:135
 timer_list_show+0x115/0x180 kernel/time/timer_list.c:291
 seq_read_iter+0x2bc/0x8f0 fs/seq_file.c:230
 proc_reg_read_iter+0x114/0x180 fs/proc/inode.c:302
 call_read_iter include/linux/fs.h:2079 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x268/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0009005b -> 0x0009005d

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7000 Comm: syz-executor.4 Not tainted 6.8.0-rc3-syzkaller-00136-g1f719a2f3fa6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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