================================================================== BUG: KCSAN: data-race in random_recv_done / virtio_read write to 0xffff888100bb06cc of 4 bytes by interrupt on cpu 1: random_recv_done+0x58/0x80 drivers/char/hw_random/virtio-rng.c:45 vring_interrupt+0x15d/0x180 drivers/virtio/virtio_ring.c:2165 __handle_irq_event_percpu+0x92/0x450 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x7b/0x110 kernel/irq/handle.c:210 handle_edge_irq+0x18e/0x5f0 kernel/irq/chip.c:820 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+0x1e/0x40 kcsan_setup_watchpoint+0x43d/0x460 kernel/kcsan/core.c:694 ebitmap_cmp+0x27/0x130 security/selinux/ss/ebitmap.c:35 mls_context_cmp security/selinux/ss/context.h:135 [inline] context_cmp security/selinux/ss/context.h:192 [inline] context_to_sid+0x2b1/0x350 security/selinux/ss/sidtab.c:67 sidtab_context_to_sid+0x37/0x740 security/selinux/ss/sidtab.c:273 security_compute_sid+0xc33/0xf20 security/selinux/ss/services.c:1904 security_transition_sid+0x5e/0x70 security/selinux/ss/services.c:1936 selinux_determine_inode_label security/selinux/hooks.c:1767 [inline] selinux_inode_init_security+0x326/0x590 security/selinux/hooks.c:2951 security_inode_init_security+0xe4/0x260 security/security.c:1081 shmem_mknod+0x97/0x170 mm/shmem.c:2818 shmem_create+0x2f/0x40 mm/shmem.c:2876 lookup_open fs/namei.c:3330 [inline] open_last_lookups fs/namei.c:3400 [inline] path_openat+0xc79/0x1f30 fs/namei.c:3606 do_filp_open+0x105/0x220 fs/namei.c:3636 do_sys_openat2+0xb5/0x2b0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0xef/0x110 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae write to 0xffff888100bb06cc of 4 bytes by task 29168 on cpu 0: request_entropy drivers/char/hw_random/virtio-rng.c:56 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1a0/0x450 drivers/char/hw_random/virtio-rng.c:92 rng_get_data drivers/char/hw_random/core.c:192 [inline] rng_dev_read+0x1b4/0x630 drivers/char/hw_random/core.c:229 vfs_read+0x1e6/0x750 fs/read_write.c:479 ksys_read+0xd9/0x190 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000040 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 29168 Comm: syz-executor.4 Not tainted 5.17.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================