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BUG: KCSAN: data-race in random_recv_done / virtio_read

read to 0xffff888101a97cec of 4 bytes by task 3687 on cpu 0:
 copy_data drivers/char/hw_random/virtio-rng.c:70 [inline]
 virtio_read+0xc3/0x3f0 drivers/char/hw_random/virtio-rng.c:92
 rng_get_data drivers/char/hw_random/core.c:197 [inline]
 rng_dev_read+0x1a7/0x5e0 drivers/char/hw_random/core.c:234
 vfs_read+0x19e/0x580 fs/read_write.c:468
 ksys_read+0xeb/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff888101a97cec of 4 bytes by interrupt on cpu 1:
 random_recv_done+0x62/0x90 drivers/char/hw_random/virtio-rng.c:45
 vring_interrupt+0x150/0x170 drivers/virtio/virtio_ring.c:2501
 __handle_irq_event_percpu+0x91/0x490 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210
 handle_edge_irq+0x167/0x590 kernel/irq/chip.c:819
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:250
 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
 arch_atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline]
 arch_atomic_long_read include/linux/atomic/atomic-long.h:29 [inline]
 atomic_long_read include/linux/atomic/atomic-instrumented.h:1310 [inline]
 find_watchpoint kernel/kcsan/core.c:131 [inline]
 check_access kernel/kcsan/core.c:737 [inline]
 __tsan_read4+0x2c/0x180 kernel/kcsan/core.c:1024
 rb_event_data kernel/trace/ring_buffer.c:270 [inline]
 ring_buffer_event_data+0x3f/0x90 kernel/trace/ring_buffer.c:284
 trace_event_buffer_reserve+0x177/0x1c0 kernel/trace/trace_events.c:520
 trace_event_raw_event_bpf_trace_printk+0x96/0x140 kernel/trace/./bpf_trace.h:11
 trace_bpf_trace_printk kernel/trace/./bpf_trace.h:11 [inline]
 ____bpf_trace_printk kernel/trace/bpf_trace.c:392 [inline]
 bpf_trace_printk+0x176/0x1d0 kernel/trace/bpf_trace.c:375
 ___bpf_prog_run+0x281/0x3050 kernel/bpf/core.c:1828
 __bpf_prog_run32+0x74/0xa0 kernel/bpf/core.c:2049
 bpf_dispatcher_nop_func include/linux/bpf.h:1168 [inline]
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run include/linux/filter.h:607 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2259 [inline]
 bpf_trace_run1+0x7b/0x110 kernel/trace/bpf_trace.c:2297
 __bpf_trace_rcu_utilization+0xd/0x10 include/trace/events/rcu.h:27
 __traceiter_rcu_utilization+0x46/0x70 include/trace/events/rcu.h:27
 trace_rcu_utilization include/trace/events/rcu.h:27 [inline]
 rcu_core+0xa2f/0xab0 kernel/rcu/tree.c:2349
 rcu_core_si+0xd/0x10 kernel/rcu/tree.c:2394
 __do_softirq+0xc1/0x265 kernel/softirq.c:571
 run_ksoftirqd+0x17/0x20 kernel/softirq.c:939
 smpboot_thread_fn+0x30a/0x4a0 kernel/smpboot.c:164
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x00000000 -> 0x00000040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 6.4.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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