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BUG: KCSAN: data-race in random_recv_done / virtio_read

read to 0xffff88810184c6cc of 4 bytes by task 10779 on cpu 0:
 copy_data drivers/char/hw_random/virtio-rng.c:70 [inline]
 virtio_read+0xc2/0x430 drivers/char/hw_random/virtio-rng.c:92
 rng_get_data drivers/char/hw_random/core.c:191 [inline]
 rng_dev_read+0x1b4/0x630 drivers/char/hw_random/core.c:228
 do_iter_read+0x348/0x5d0 fs/read_write.c:805
 vfs_readv fs/read_write.c:923 [inline]
 do_preadv+0x159/0x230 fs/read_write.c:1015
 __do_sys_preadv fs/read_write.c:1065 [inline]
 __se_sys_preadv fs/read_write.c:1060 [inline]
 __x64_sys_preadv+0x54/0x60 fs/read_write.c:1060
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

write to 0xffff88810184c6cc of 4 bytes by interrupt on cpu 1:
 random_recv_done+0x58/0x80 drivers/char/hw_random/virtio-rng.c:45
 vring_interrupt+0x143/0x1c0 drivers/virtio/virtio_ring.c:2149
 __handle_irq_event_percpu+0x92/0x400 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x60/0xf0 kernel/irq/handle.c:210
 handle_edge_irq+0x17e/0x5a0 kernel/irq/chip.c:817
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0x60/0x100 arch/x86/kernel/irq.c:250
 common_interrupt+0x9a/0xc0 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x27/0x40
 i_user_ns include/linux/fs.h:1570 [inline]
 i_uid_into_mnt include/linux/fs.h:1609 [inline]
 acl_permission_check fs/namei.c:342 [inline]
 generic_permission+0x49/0x380 fs/namei.c:404
 do_inode_permission fs/namei.c:465 [inline]
 inode_permission+0x73/0x300 fs/namei.c:525
 may_lookup fs/namei.c:1727 [inline]
 link_path_walk+0x17d/0x7a0 fs/namei.c:2283
 path_parentat fs/namei.c:2540 [inline]
 filename_parentat+0x123/0x390 fs/namei.c:2563
 do_unlinkat+0x9d/0x510 fs/namei.c:4231
 __do_sys_unlink fs/namei.c:4308 [inline]
 __se_sys_unlink fs/namei.c:4306 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4306
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x00000000 -> 0x00000040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1444 Comm: udevd Not tainted 5.19.0-rc3-syzkaller-00048-gde5c208d533a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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