syzbot

==================================================================
BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

read-write to 0xffff888237c1b8d8 of 4 bytes by interrupt on cpu 0:
 hrtimer_interrupt+0x5d/0x850 kernel/time/hrtimer.c:2091
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
 memset_orig+0x75/0xb0 arch/x86/lib/memset_64.S:91
 get_timespec64+0x3c/0x100 kernel/time/time.c:870
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1380 [inline]
 __se_sys_clock_nanosleep+0x10b/0x260 kernel/time/posix-timers.c:1368
 __x64_sys_clock_nanosleep+0x55/0x70 kernel/time/posix-timers.c:1368
 x64_sys_call+0x146e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:231
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237c1b8d8 of 4 bytes by task 1460 on cpu 1:
 print_cpu+0x346/0x670 kernel/time/timer_list.c:131
 timer_list_show+0x107/0x170 kernel/time/timer_list.c:291
 seq_read_iter+0x636/0x940 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+0x465/0xbf0 io_uring/rw.c:952
 io_read+0x4a/0x190 io_uring/rw.c:1031
 __io_issue_sqe+0xfd/0x2d0 io_uring/io_uring.c:1399
 io_issue_sqe+0x206/0xba0 io_uring/io_uring.c:1422
 io_queue_sqe io_uring/io_uring.c:1653 [inline]
 io_submit_sqe io_uring/io_uring.c:1938 [inline]
 io_submit_sqes+0x7f0/0x1170 io_uring/io_uring.c:2061
 __do_sys_io_uring_enter io_uring/io_uring.c:2651 [inline]
 __se_sys_io_uring_enter+0x25c/0xfc0 io_uring/io_uring.c:2600
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:2600
 x64_sys_call+0x1e16/0x3020 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x002809e5 -> 0x002809e6

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 1460 Comm: syz.3.8638 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
==================================================================