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BUG: KCSAN: data-race in __perf_event_overflow / __perf_event_set_bpf_prog

write to 0xffff88811ac6a2a8 of 8 bytes by task 23981 on cpu 0:
 perf_event_set_bpf_handler kernel/events/core.c:10711 [inline]
 __perf_event_set_bpf_prog+0x46b/0x4d0 kernel/events/core.c:11697
 _perf_ioctl kernel/events/core.c:6662 [inline]
 perf_ioctl+0x8e4/0x1590 kernel/events/core.c:6722
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583
 x64_sys_call+0x1563/0x3020 arch/x86/include/generated/asm/syscalls_64.h:17
 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 0xffff88811ac6a2a8 of 8 bytes by interrupt on cpu 1:
 __perf_event_overflow+0x230/0x940 kernel/events/core.c:10769
 perf_event_overflow kernel/events/core.c:10853 [inline]
 perf_swevent_hrtimer+0x28d/0x310 kernel/events/core.c:12273
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x1f8/0x510 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x257/0x810 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
 __sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:213
 chacha_permute+0x39a/0x510 lib/crypto/chacha-block-generic.c:24
 chacha_block_generic+0x47/0x310 lib/crypto/chacha-block-generic.c:83
 chacha20_block include/crypto/chacha.h:45 [inline]
 get_random_bytes_user+0xf7/0x2b0 drivers/char/random.c:458
 __do_sys_getrandom drivers/char/random.c:1406 [inline]
 __se_sys_getrandom drivers/char/random.c:1380 [inline]
 __x64_sys_getrandom+0xcf/0x1a0 drivers/char/random.c:1380
 x64_sys_call+0x2a28/0x3020 arch/x86/include/generated/asm/syscalls_64.h:319
 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: 0x0000000000000000 -> 0xffffc9000511d000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23978 Comm: syz.3.7094 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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