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BUG: KCSAN: data-race in probe_sched_switch / tracing_stop_cmdline_record

read-write to 0xffffffff893e0120 of 4 bytes by task 5456 on cpu 1:
 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:947
 vfs_open+0x37/0x1e0 fs/open.c:1052
 do_open fs/namei.c:4700 [inline]
 path_openat+0x1b39/0x2000 fs/namei.c:4863
 do_file_open+0x16c/0x290 fs/namei.c:4892
 do_sys_openat2+0xa0/0x130 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1385
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff893e0120 of 4 bytes by task 5478 on cpu 0:
 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+0xc23/0xd10 kernel/sched/core.c:7231
 preempt_schedule_irq+0x2d/0x50 kernel/sched/core.c:7556
 raw_irqentry_exit_cond_resched+0x4b/0x60 kernel/entry/common.c:145
 irqentry_exit_to_kernel_mode_preempt+0x2b/0x40 include/linux/irq-entry-common.h:468
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x7d/0x610 kernel/entry/common.c:167
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:681
 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline]
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x1a/0x30 kernel/locking/spinlock.c:198
 __unix_dgram_recvmsg+0x3a4/0x860 net/unix/af_unix.c:2608
 unix_dgram_recvmsg+0x7e/0x90 net/unix/af_unix.c:2682
 sock_recvmsg_nosec+0xc2/0xf0 net/socket.c:1126
 ____sys_recvmsg+0x26f/0x280 net/socket.c:2902
 ___sys_recvmsg+0x11f/0x3a0 net/socket.c:2946
 do_recvmmsg+0x1e5/0x560 net/socket.c:3041
 __sys_recvmmsg net/socket.c:3115 [inline]
 __do_sys_recvmmsg net/socket.c:3138 [inline]
 __se_sys_recvmmsg net/socket.c:3131 [inline]
 __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3131
 x64_sys_call+0x80f/0x3020 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000007e6 -> 0x000007e5

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5478 Comm: syz.9.8700 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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