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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

write to 0xffff888237c1ae20 of 8 bytes by interrupt on cpu 0:
 hrtimer_interrupt+0x1a9/0x4a0 kernel/time/hrtimer.c:1879
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 radix_tree_load_root lib/radix-tree.c:-1 [inline]
 idr_get_free+0x423/0x560 lib/radix-tree.c:1486
 idr_alloc_u32+0xcd/0x180 lib/idr.c:46
 idr_alloc_cyclic+0x87/0x140 lib/idr.c:125
 __kernfs_new_node+0xb7/0x380 fs/kernfs/dir.c:643
 kernfs_new_node+0xd7/0x150 fs/kernfs/dir.c:713
 __kernfs_create_file+0x49/0x180 fs/kernfs/file.c:1038
 sysfs_add_file_mode_ns+0x136/0x1c0 fs/sysfs/file.c:319
 create_files fs/sysfs/group.c:76 [inline]
 internal_create_group+0x467/0xa40 fs/sysfs/group.c:183
 internal_create_groups fs/sysfs/group.c:223 [inline]
 sysfs_create_groups+0x3c/0xe0 fs/sysfs/group.c:249
 setup_port drivers/infiniband/core/sysfs.c:1247 [inline]
 ib_setup_port_attrs+0x978/0x13c0 drivers/infiniband/core/sysfs.c:1433
 add_one_compat_dev+0x346/0x440 drivers/infiniband/core/device.c:968
 rdma_dev_init_net+0x18c/0x220 drivers/infiniband/core/device.c:1184
 ops_init+0x21e/0x2d0 net/core/net_namespace.c:138
 setup_net+0x14f/0x610 net/core/net_namespace.c:364
 copy_net_ns+0x5a3/0x740 net/core/net_namespace.c:518
 create_new_namespaces+0x228/0x430 kernel/nsproxy.c:110
 copy_namespaces+0x1ad/0x210 kernel/nsproxy.c:179
 copy_process+0xd23/0x1f60 kernel/fork.c:2432
 kernel_clone+0x168/0x5d0 kernel/fork.c:2844
 __do_sys_clone kernel/fork.c:2987 [inline]
 __se_sys_clone kernel/fork.c:2971 [inline]
 __x64_sys_clone+0xe9/0x120 kernel/fork.c:2971
 x64_sys_call+0x2dc9/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237c1ae20 of 8 bytes by task 18659 on cpu 1:
 print_cpu+0x307/0x680 kernel/time/timer_list.c:133
 timer_list_show+0x115/0x180 kernel/time/timer_list.c:295
 seq_read_iter+0x661/0x970 fs/seq_file.c:272
 proc_reg_read_iter+0x118/0x190 fs/proc/inode.c:299
 copy_splice_read+0x390/0x5d0 fs/splice.c:363
 do_splice_read fs/splice.c:979 [inline]
 splice_direct_to_actor+0x26c/0x680 fs/splice.c:1083
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0xd9/0x150 fs/splice.c:1227
 do_sendfile+0x40a/0x690 fs/read_write.c:1368
 __do_sys_sendfile64 fs/read_write.c:1429 [inline]
 __se_sys_sendfile64 fs/read_write.c:1415 [inline]
 __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415
 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000004ffab5c927 -> 0x0000004ffab68c77

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 18659 Comm: syz.4.5822 Not tainted 6.15.0-rc2-syzkaller-00048-gc62f4b82d571 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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