================================================================== BUG: KCSAN: data-race in detach_buf_split / virtqueue_add read to 0xffff888101a7d42c of 4 bytes by task 12451 on cpu 0: virtqueue_add_split drivers/virtio/virtio_ring.c:575 [inline] virtqueue_add+0x75a/0x20e0 drivers/virtio/virtio_ring.c:2133 virtqueue_add_inbuf+0x53/0x80 drivers/virtio/virtio_ring.c:2212 request_entropy drivers/char/hw_random/virtio-rng.c:61 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1c5/0x3f0 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 read-write to 0xffff888101a7d42c of 4 bytes by interrupt on cpu 1: detach_buf_split+0x316/0x570 drivers/virtio/virtio_ring.c:760 virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:835 [inline] virtqueue_get_buf_ctx+0x3c2/0x5b0 drivers/virtio/virtio_ring.c:2327 virtqueue_get_buf+0x1f/0x30 drivers/virtio/virtio_ring.c:2333 random_recv_done+0x4c/0x90 drivers/char/hw_random/virtio-rng.c:42 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+0x3d/0x90 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 value changed: 0x000000ff -> 0x000000fe Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3069 Comm: syz-fuzzer Not tainted 6.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ================================================================== ================================================================== BUG: KCSAN: data-race in detach_buf_split / virtqueue_add read to 0xffff888101a7d42c of 4 bytes by task 12769 on cpu 0: virtqueue_add_split drivers/virtio/virtio_ring.c:575 [inline] virtqueue_add+0x75a/0x20e0 drivers/virtio/virtio_ring.c:2133 virtqueue_add_inbuf+0x53/0x80 drivers/virtio/virtio_ring.c:2212 request_entropy drivers/char/hw_random/virtio-rng.c:61 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1c5/0x3f0 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 read-write to 0xffff888101a7d42c of 4 bytes by interrupt on cpu 1: detach_buf_split+0x316/0x570 drivers/virtio/virtio_ring.c:760 virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:835 [inline] virtqueue_get_buf_ctx+0x3c2/0x5b0 drivers/virtio/virtio_ring.c:2327 virtqueue_get_buf+0x1f/0x30 drivers/virtio/virtio_ring.c:2333 random_recv_done+0x4c/0x90 drivers/char/hw_random/virtio-rng.c:42 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 wait_consider_task+0x48/0x1670 kernel/exit.c:1391 do_wait_thread kernel/exit.c:1500 [inline] do_wait+0x183/0x650 kernel/exit.c:1617 kernel_wait4+0x15f/0x1c0 kernel/exit.c:1780 __do_sys_wait4 kernel/exit.c:1808 [inline] __se_sys_wait4 kernel/exit.c:1804 [inline] __x64_sys_wait4+0x94/0x120 kernel/exit.c:1804 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 value changed: 0x00000100 -> 0x000000ff Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3076 Comm: syz-executor.5 Not tainted 6.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ================================================================== ================================================================== BUG: KCSAN: data-race in detach_buf_split / virtqueue_add read to 0xffff888101a7d42c of 4 bytes by task 13062 on cpu 0: virtqueue_add_split drivers/virtio/virtio_ring.c:575 [inline] virtqueue_add+0x75a/0x20e0 drivers/virtio/virtio_ring.c:2133 virtqueue_add_inbuf+0x53/0x80 drivers/virtio/virtio_ring.c:2212 request_entropy drivers/char/hw_random/virtio-rng.c:61 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1c5/0x3f0 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 read-write to 0xffff888101a7d42c of 4 bytes by interrupt on cpu 1: detach_buf_split+0x316/0x570 drivers/virtio/virtio_ring.c:760 virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:835 [inline] virtqueue_get_buf_ctx+0x3c2/0x5b0 drivers/virtio/virtio_ring.c:2327 virtqueue_get_buf+0x1f/0x30 drivers/virtio/virtio_ring.c:2333 random_recv_done+0x4c/0x90 drivers/char/hw_random/virtio-rng.c:42 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 d_same_name fs/dcache.c:2263 [inline] __d_lookup+0x164/0x380 fs/dcache.c:2494 lookup_fast+0x4c/0x290 fs/namei.c:1648 walk_component fs/namei.c:1994 [inline] link_path_walk+0x3f4/0x7e0 fs/namei.c:2325 path_lookupat+0x72/0x2a0 fs/namei.c:2478 filename_lookup+0x126/0x300 fs/namei.c:2508 vfs_statx+0xa9/0x300 fs/stat.c:238 vfs_fstatat fs/stat.c:276 [inline] __do_sys_newfstatat fs/stat.c:446 [inline] __se_sys_newfstatat+0x8a/0x2a0 fs/stat.c:440 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:440 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 value changed: 0x00000102 -> 0x00000101 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2745 Comm: udevd Not tainted 6.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ================================================================== ================================================================== BUG: KCSAN: data-race in detach_buf_split / virtqueue_add read to 0xffff888101a7d448 of 4 bytes by task 13092 on cpu 0: virtqueue_add_split drivers/virtio/virtio_ring.c:553 [inline] virtqueue_add+0x4b3/0x20e0 drivers/virtio/virtio_ring.c:2133 virtqueue_add_inbuf+0x53/0x80 drivers/virtio/virtio_ring.c:2212 request_entropy drivers/char/hw_random/virtio-rng.c:61 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1c5/0x3f0 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 read-write to 0xffff888101a7d448 of 4 bytes by interrupt on cpu 1: detach_buf_split+0x2fc/0x570 drivers/virtio/virtio_ring.c:757 virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:835 [inline] virtqueue_get_buf_ctx+0x3c2/0x5b0 drivers/virtio/virtio_ring.c:2327 virtqueue_get_buf+0x1f/0x30 drivers/virtio/virtio_ring.c:2333 random_recv_done+0x4c/0x90 drivers/char/hw_random/virtio-rng.c:42 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 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x2f/0x40 kernel/locking/spinlock.c:202 process_one_work+0x3cd/0x750 kernel/workqueue.c:2381 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2555 kthread+0x1d7/0x210 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 value changed: 0x00000000 -> 0x00000002 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3093 Comm: kworker/u4:4 Not tainted 6.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Workqueue: events_unbound flush_to_ldisc ==================================================================