================================================================== BUG: KCSAN: data-race in detach_buf_split / virtqueue_add read to 0xffff888101b8fd2c of 4 bytes by task 16316 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+0x19f/0x5c0 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 0xffff888101b8fd2c 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:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247 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_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x3d/0x50 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline] __wake_up_common_lock kernel/sched/wait.c:140 [inline] __wake_up_sync_key+0x8f/0xc0 kernel/sched/wait.c:208 __unix_dgram_recvmsg+0x3c3/0x870 net/unix/af_unix.c:2380 unix_dgram_recvmsg+0x7b/0x90 net/unix/af_unix.c:2450 sock_recvmsg_nosec+0x4c/0x80 net/socket.c:1020 ____sys_recvmsg+0x2db/0x310 net/socket.c:2711 ___sys_recvmsg net/socket.c:2755 [inline] do_recvmmsg+0x2eb/0x720 net/socket.c:2849 __sys_recvmmsg net/socket.c:2928 [inline] __do_sys_recvmmsg net/socket.c:2951 [inline] __se_sys_recvmmsg net/socket.c:2944 [inline] __x64_sys_recvmmsg+0xe2/0x160 net/socket.c:2944 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: 16330 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller-07208-gc6b0271053e7 #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 0xffff888101b8fd48 of 4 bytes by task 16328 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+0x19f/0x5c0 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 0xffff888101b8fd48 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:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 preempt_count arch/x86/include/asm/preempt.h:27 [inline] check_kcov_mode kernel/kcov.c:173 [inline] write_comp_data kernel/kcov.c:236 [inline] __sanitizer_cov_trace_const_cmp4+0x17/0x90 kernel/kcov.c:304 __ext4_journal_get_write_access+0x217/0x450 fs/ext4/ext4_jbd2.c:248 ext4_reserve_inode_write+0x14e/0x200 fs/ext4/inode.c:5711 __ext4_mark_inode_dirty+0x8e/0x440 fs/ext4/inode.c:5885 ext4_mkdir+0x344/0x740 fs/ext4/namei.c:3025 vfs_mkdir+0x1ac/0x2b0 fs/namei.c:4117 do_mkdirat+0xf9/0x260 fs/namei.c:4140 __do_sys_mkdirat fs/namei.c:4155 [inline] __se_sys_mkdirat fs/namei.c:4153 [inline] __x64_sys_mkdirat+0x50/0x60 fs/namei.c:4153 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: 0x00000001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3064 Comm: syz-executor.1 Not tainted 6.4.0-syzkaller-07208-gc6b0271053e7 #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 0xffff888101b8fd2c of 4 bytes by task 17079 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+0x19f/0x5c0 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 0xffff888101b8fd2c 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:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247 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 spin_unlock_irq include/linux/spinlock.h:400 [inline] filemap_remove_folio+0x74/0x210 mm/filemap.c:261 truncate_inode_folio+0x19f/0x1e0 mm/truncate.c:196 shmem_undo_range+0x259/0xb80 mm/shmem.c:950 shmem_truncate_range mm/shmem.c:1049 [inline] shmem_evict_inode+0x130/0x4d0 mm/shmem.c:1164 evict+0x1aa/0x410 fs/inode.c:665 iput_final fs/inode.c:1789 [inline] iput+0x42c/0x5b0 fs/inode.c:1815 dentry_unlink_inode+0x22a/0x240 fs/dcache.c:401 __dentry_kill+0x2db/0x4a0 fs/dcache.c:607 dentry_kill+0x8d/0x1e0 dput+0x118/0x1f0 fs/dcache.c:913 __fput+0x475/0x600 fs/file_table.c:386 ____fput+0x15/0x20 fs/file_table.c:406 task_work_run+0x135/0x1a0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00000105 -> 0x00000104 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16896 Comm: syz-executor.5 Not tainted 6.4.0-syzkaller-07208-gc6b0271053e7 #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 0xffff888101b8fd48 of 4 bytes by task 17949 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+0x19f/0x5c0 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 0xffff888101b8fd48 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:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 __sanitizer_cov_trace_cmp4+0x8/0x90 kernel/kcov.c:278 files_lookup_fd_raw include/linux/fdtable.h:87 [inline] __fget_light fs/file.c:1017 [inline] __fdget_raw+0x6e/0xf0 fs/file.c:1036 fdget_raw include/linux/file.h:68 [inline] path_init+0x44f/0x930 fs/namei.c:2413 path_lookupat+0x27/0x2a0 fs/namei.c:2469 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: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2746 Comm: udevd Not tainted 6.4.0-syzkaller-07208-gc6b0271053e7 #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 0xffff888101b8fd2c of 4 bytes by task 19754 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+0x19f/0x5c0 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 0xffff888101b8fd2c 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:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 __check_object_size+0x5/0x520 mm/usercopy.c:214 check_object_size include/linux/thread_info.h:215 [inline] check_copy_size include/linux/thread_info.h:251 [inline] copy_from_iter include/linux/uio.h:201 [inline] copy_from_iter_full include/linux/uio.h:209 [inline] memcpy_from_msg include/linux/skbuff.h:3999 [inline] netlink_sendmsg+0x52e/0x770 net/netlink/af_netlink.c:1899 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg net/socket.c:748 [inline] ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2494 ___sys_sendmsg net/socket.c:2548 [inline] __sys_sendmsg+0x1e9/0x270 net/socket.c:2577 __do_sys_sendmsg net/socket.c:2586 [inline] __se_sys_sendmsg net/socket.c:2584 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2584 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: 0x0000010b -> 0x0000010a Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2746 Comm: udevd Not tainted 6.4.0-syzkaller-07208-gc6b0271053e7 #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 0xffff888101b8fd48 of 4 bytes by task 21004 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+0x19f/0x5c0 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 0xffff888101b8fd48 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:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 __tsan_read1+0x12/0x180 kernel/kcsan/core.c:1022 link_path_walk+0x74/0x7e0 fs/namei.c:2252 path_parentat fs/namei.c:2526 [inline] __filename_parentat+0x13b/0x3c0 fs/namei.c:2550 filename_parentat fs/namei.c:2568 [inline] do_renameat2+0x24e/0xa20 fs/namei.c:4926 __do_sys_rename fs/namei.c:5056 [inline] __se_sys_rename fs/namei.c:5054 [inline] __x64_sys_rename+0x5c/0x70 fs/namei.c:5054 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: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 32381 Comm: udevd Not tainted 6.4.0-syzkaller-07208-gc6b0271053e7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ==================================================================