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BUG: KCSAN: data-race in probe_sched_switch / tracing_stop_cmdline_record

read-write to 0xffffffff895d81a0 of 4 bytes by task 32403 on cpu 0:
 tracing_stop_sched_switch kernel/trace/trace_sched_switch.c:120 [inline]
 tracing_stop_cmdline_record+0x28/0xc0 kernel/trace/trace_sched_switch.c:140
 __ftrace_event_enable_disable+0x323/0x4b0 kernel/trace/trace_events.c:821
 ftrace_event_enable_disable kernel/trace/trace_events.c:907 [inline]
 ftrace_clear_events kernel/trace/trace_events.c:1030 [inline]
 ftrace_event_set_open+0xe6/0x200 kernel/trace/trace_events.c:2803
 do_dentry_open+0x49f/0xa60 fs/open.c:996
 vfs_open+0x37/0x1e0 fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0xc01/0x10d0 fs/namei.c:5000
 do_file_open+0x16c/0x290 fs/namei.c:5029
 do_sys_openat2+0xa0/0x130 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1434
 x64_sys_call+0x1f72/0x2550 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff895d81a0 of 4 bytes by task 2981 on cpu 1:
 probe_sched_switch+0x46/0xa0 kernel/trace/trace_sched_switch.c:32
 __do_trace_sched_switch include/trace/events/sched.h:220 [inline]
 trace_sched_switch include/trace/events/sched.h:220 [inline]
 __schedule+0xc31/0xd20 kernel/sched/core.c:7236
 preempt_schedule_notrace+0x31/0x50 kernel/sched/core.c:7511
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 class_preempt_notrace_destructor include/linux/preempt.h:501 [inline]
 trace_event_raw_event_sys_exit+0xe4/0xf0 include/trace/events/syscalls.h:44
 __do_trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 trace_syscall_exit+0xba/0x110 kernel/entry/syscall-common.c:18
 syscall_exit_work include/linux/entry-common.h:262 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:297 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:334 [inline]
 do_syscall_64+0x31c/0x360 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000090c -> 0x0000090b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2981 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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