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

read-write to 0xffff888237d1edd8 of 2 bytes by interrupt on cpu 1:
 hrtimer_interrupt+0x31f/0x7b0 kernel/time/hrtimer.c:1847
 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+0x31/0x80 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
 get_ctx kernel/kcsan/core.c:206 [inline]
 check_access kernel/kcsan/core.c:750 [inline]
 __tsan_read4+0xd1/0x180 kernel/kcsan/core.c:1024
 stack_trace_consume_entry+0x30/0xc0 kernel/stacktrace.c:86
 arch_stack_walk+0x13a/0x1a0 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0x60/0x90 kernel/stacktrace.c:122
 ref_tracker_free+0xa1/0x400 lib/ref_tracker.c:239
 __netns_tracker_free include/net/net_namespace.h:350 [inline]
 put_net_track include/net/net_namespace.h:365 [inline]
 __sk_destruct+0x285/0x440 net/core/sock.c:2199
 sk_destruct net/core/sock.c:2218 [inline]
 __sk_free+0x284/0x2d0 net/core/sock.c:2229
 sk_free+0x39/0x70 net/core/sock.c:2240
 deferred_put_nlk_sk+0x13c/0x160 net/netlink/af_netlink.c:748
 rcu_do_batch kernel/rcu/tree.c:2153 [inline]
 rcu_core+0x58e/0xbe0 kernel/rcu/tree.c:2417
 rcu_core_si+0xd/0x10 kernel/rcu/tree.c:2434
 __do_softirq+0xc4/0x279 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0x3b/0x90 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x6d/0x80 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
 context_to_sid+0x41/0x340 security/selinux/ss/sidtab.c:65
 sidtab_context_to_sid+0x38/0x5e0 security/selinux/ss/sidtab.c:274
 security_compute_sid+0xd11/0xed0 security/selinux/ss/services.c:1871
 security_transition_sid+0x58/0x70 security/selinux/ss/services.c:1901
 selinux_determine_inode_label+0x209/0x230 security/selinux/hooks.c:1787
 may_create+0x212/0x2f0 security/selinux/hooks.c:1821
 selinux_inode_create+0x22/0x30 security/selinux/hooks.c:3005
 security_inode_create+0x75/0xb0 security/security.c:1914
 may_o_create fs/namei.c:3311 [inline]
 lookup_open fs/namei.c:3440 [inline]
 open_last_lookups fs/namei.c:3546 [inline]
 path_openat+0xa1c/0x1d70 fs/namei.c:3776
 do_filp_open+0xf6/0x200 fs/namei.c:3809
 do_sys_openat2+0xab/0x110 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_openat fs/open.c:1471 [inline]
 __se_sys_openat fs/open.c:1466 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1466
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237d1edd8 of 2 bytes by task 3518 on cpu 0:
 print_cpu+0x36a/0x640 kernel/time/timer_list.c:136
 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:2014 [inline]
 copy_splice_read+0x26b/0x4b0 fs/splice.c:364
 vfs_splice_read fs/splice.c:993 [inline]
 splice_direct_to_actor+0x28c/0x690 fs/splice.c:1069
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3c4/0x980 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0e62 -> 0x0e64

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3518 Comm: syz-executor.4 Not tainted 6.6.0-syzkaller-15029-gbe3ca57cfb77 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
==================================================================