syzbot

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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

read-write to 0xffff888237d1b894 of 4 bytes by interrupt on cpu 1:
 hrtimer_interrupt+0x76/0x810 kernel/time/hrtimer.c:1889
 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
 pick_link+0x51e/0x8e0 fs/namei.c:2062
 step_into_slowpath+0x36a/0x4c0 fs/namei.c:2124
 step_into fs/namei.c:2149 [inline]
 walk_component fs/namei.c:2285 [inline]
 link_path_walk+0x974/0xe30 fs/namei.c:2653
 path_openat+0x1c6/0x2050 fs/namei.c:4832
 do_file_open+0x16c/0x290 fs/namei.c:4865
 do_sys_openat2+0x94/0x130 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1383
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 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 0xffff888237d1b894 of 4 bytes by task 26523 on cpu 0:
 print_cpu+0x338/0x660 kernel/time/timer_list.c:133
 timer_list_show+0x107/0x170 kernel/time/timer_list.c:293
 seq_read_iter+0x636/0x940 fs/seq_file.c:273
 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: 0x002f5d8c -> 0x002f5d8f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 26523 Comm: syz.5.5689 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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