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BUG: KCSAN: data-race in __perf_event_overflow / fasync_remove_entry

write to 0xffff8880a075fb00 of 8 bytes by task 8943 on cpu 0:
 fasync_remove_entry+0xb7/0x120 fs/fcntl.c:884
 fasync_helper+0xc9/0xd6 fs/fcntl.c:983
 perf_fasync+0x64/0x90 kernel/events/core.c:6187
 __fput+0x455/0x500 fs/file_table.c:277
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xba/0x120 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:165
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x38b/0x3b0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a075fb00 of 8 bytes by interrupt on cpu 1:
 __perf_event_overflow+0x116/0x200 kernel/events/core.c:8738
 perf_swevent_hrtimer+0x261/0x280 kernel/events/core.c:10120
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 get_current arch/x86/include/asm/current.h:15 [inline]
 write_comp_data+0x9/0x70 kernel/kcov.c:207
 mpihelp_submul_1+0x12f/0x180 lib/mpi/generic_mpih-mul3.c:43
 mpihelp_divrem+0x195/0xfa0 lib/mpi/mpih-div.c:209
 mpi_powm+0xad2/0x1290 lib/mpi/mpi-pow.c:205
 _compute_val crypto/dh.c:39 [inline]
 dh_compute_value+0x21e/0x330 crypto/dh.c:178
 crypto_kpp_generate_public_key include/crypto/kpp.h:315 [inline]
 __keyctl_dh_compute+0x6c5/0xe20 security/keys/dh.c:367
 keyctl_dh_compute+0x78/0xbb security/keys/dh.c:422
 __do_sys_keyctl security/keys/keyctl.c:1887 [inline]
 __se_sys_keyctl security/keys/keyctl.c:1783 [inline]
 __x64_sys_keyctl+0xf2/0x3c0 security/keys/keyctl.c:1783
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8948 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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