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BUG: KCSAN: data-race in handle_edge_irq / kstat_irqs_usr

write to 0xffff88812b3ee288 of 4 bytes by interrupt on cpu 1:
 kstat_incr_irqs_this_cpu kernel/irq/internals.h:259 [inline]
 handle_edge_irq+0x121/0x5f0 kernel/irq/chip.c:797
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 handle_irq arch/x86/kernel/irq.c:230 [inline]
 __common_interrupt arch/x86/kernel/irq.c:249 [inline]
 common_interrupt+0x129/0x1e0 arch/x86/kernel/irq.c:239
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:572

read to 0xffff88812b3ee288 of 4 bytes by task 13254 on cpu 0:
 kstat_irqs kernel/irq/irqdesc.c:997 [inline]
 kstat_irqs_usr+0xbe/0x190 kernel/irq/irqdesc.c:1018
 show_all_irqs fs/proc/stat.c:101 [inline]
 show_stat+0xacd/0xd10 fs/proc/stat.c:194
 seq_read+0x2ee/0x900 fs/seq_file.c:208
 pde_read fs/proc/inode.c:306 [inline]
 proc_reg_read+0xde/0x1a0 fs/proc/inode.c:316
 do_loop_readv_writev fs/read_write.c:734 [inline]
 do_iter_read+0x3d2/0x4b0 fs/read_write.c:955
 vfs_readv fs/read_write.c:1073 [inline]
 do_preadv+0x13b/0x230 fs/read_write.c:1165
 __do_sys_preadv fs/read_write.c:1215 [inline]
 __se_sys_preadv fs/read_write.c:1210 [inline]
 __x64_sys_preadv+0x54/0x60 fs/read_write.c:1210
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13254 Comm: syz-executor.1 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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