syzbot

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BUG: KCSAN: data-race in clockevents_program_event / print_tickdevice

write to 0xffff888237d17758 of 8 bytes by interrupt on cpu 1:
 clockevents_program_event+0x3f/0x4e0 kernel/time/clockevents.c:313
 tick_program_event+0x79/0xc0 kernel/time/tick-oneshot.c:44
 hrtimer_interrupt+0x25e/0x460 kernel/time/hrtimer.c:1900
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1d0 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705
 skb_is_nonlinear include/linux/skbuff.h:2481 [inline]
 skb_tailroom include/linux/skbuff.h:2852 [inline]
 audit_log_n_string+0x4d/0x290 kernel/audit.c:2072
 audit_log_n_untrustedstring kernel/audit.c:2123 [inline]
 audit_log_untrustedstring+0xb6/0xd0 kernel/audit.c:2136
 dump_common_audit_data security/lsm_audit.c:420 [inline]
 common_lsm_audit+0x192/0x230 security/lsm_audit.c:451
 slow_avc_audit+0x104/0x140 security/selinux/avc.c:779
 avc_audit security/selinux/include/avc.h:127 [inline]
 avc_has_perm+0x128/0x150 security/selinux/avc.c:1198
 selinux_bpf+0xa3/0xc0 security/selinux/hooks.c:-1
 security_bpf+0x52/0x90 security/security.c:5640
 __sys_bpf+0x1bf/0x790 kernel/bpf/syscall.c:5812
 __do_sys_bpf kernel/bpf/syscall.c:5943 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5941 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:5941
 x64_sys_call+0x2478/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d17758 of 8 bytes by task 3002 on cpu 0:
 print_tickdevice+0x142/0x340 kernel/time/timer_list.c:208
 timer_list_show+0x6c/0x170 kernel/time/timer_list.c:300
 seq_read_iter+0x627/0x940 fs/seq_file.c:272
 proc_reg_read_iter+0x110/0x180 fs/proc/inode.c:299
 copy_splice_read+0x3c1/0x5f0 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+0xda/0x150 fs/splice.c:1227
 do_sendfile+0x380/0x650 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64 fs/read_write.c:1417 [inline]
 __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417
 x64_sys_call+0xb39/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x7fffffffffffffff -> 0x0000006d26fa87e8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3002 Comm: GPL Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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