===================================================== BUG: KMSAN: uninit-value in line6_midibuf_read+0x40b/0x1050 sound/usb/line6/midibuf.c:155 line6_midibuf_read+0x40b/0x1050 sound/usb/line6/midibuf.c:155 line6_data_received+0x4be/0x7e0 sound/usb/line6/driver.c:306 __usb_hcd_giveback_urb+0x572/0x840 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x157/0x720 drivers/usb/core/hcd.c:1734 dummy_timer+0xd3f/0x6aa0 drivers/usb/gadget/udc/dummy_hcd.c:1987 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x564/0xe40 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x3ab/0x1490 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0xa6/0x3a0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x40/0x90 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702 tcp_drop_reason net/ipv4/tcp_input.c:4896 [inline] tcp_rcv_established+0xc6a/0x2610 net/ipv4/tcp_input.c:6238 tcp_v4_do_rcv+0x7f3/0x11a0 net/ipv4/tcp_ipv4.c:1909 tcp_v4_rcv+0x51d0/0x5740 net/ipv4/tcp_ipv4.c:2344 ip_protocol_deliver_rcu+0x2a3/0x13d0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0x15f3/0x17f0 net/ipv4/ip_input.c:639 ip_list_rcv+0x9ef/0xa40 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5703 [inline] __netif_receive_skb_list_core+0x15c5/0x1670 net/core/dev.c:5751 __netif_receive_skb_list net/core/dev.c:5803 [inline] netif_receive_skb_list_internal+0x1085/0x1700 net/core/dev.c:5895 gro_normal_list include/net/gro.h:515 [inline] napi_complete_done+0x425/0x880 net/core/dev.c:6246 virtqueue_napi_complete drivers/net/virtio_net.c:694 [inline] virtnet_poll+0x5b9d/0x6a20 drivers/net/virtio_net.c:2826 __napi_poll+0xe7/0x980 net/core/dev.c:6771 napi_poll net/core/dev.c:6840 [inline] net_rx_action+0xa5a/0x19b0 net/core/dev.c:6962 handle_softirqs+0x1ce/0x800 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0x68/0x120 kernel/softirq.c:637 irq_exit_rcu+0x12/0x20 kernel/softirq.c:649 common_interrupt+0x94/0xa0 arch/x86/kernel/irq.c:278 asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:693 __msan_metadata_ptr_for_load_8+0x31/0x40 mm/kmsan/instrumentation.c:92 on_stack+0x3a/0x1b0 update_stack_state+0xc1/0x270 arch/x86/kernel/unwind_frame.c:228 __unwind_start+0x275/0x520 arch/x86/kernel/unwind_frame.c:407 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x105/0x2d0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xaa/0xe0 kernel/stacktrace.c:122 kmsan_save_stack_with_flags mm/kmsan/core.c:74 [inline] kmsan_internal_chain_origin+0x57/0xd0 mm/kmsan/core.c:183 kmsan_internal_memmove_metadata+0x17b/0x230 mm/kmsan/core.c:139 __msan_memcpy+0x108/0x1c0 mm/kmsan/instrumentation.c:199 sock_write_iter+0x38e/0x3d0 net/socket.c:1161 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb2f/0x1550 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 x64_sys_call+0x3490/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:3985 [inline] slab_alloc_node mm/slub.c:4028 [inline] __do_kmalloc_node mm/slub.c:4148 [inline] __kmalloc_noprof+0x661/0xf30 mm/slub.c:4161 kmalloc_noprof include/linux/slab.h:685 [inline] line6_midibuf_init+0x43/0x180 sound/usb/line6/midibuf.c:51 line6_init_midi+0x3e7/0x670 sound/usb/line6/midi.c:284 line6_init_cap_control+0x54e/0x770 sound/usb/line6/driver.c:704 line6_probe+0xeae/0x1120 sound/usb/line6/driver.c:797 pod_probe+0x79/0x90 sound/usb/line6/pod.c:522 usb_probe_interface+0xd6f/0x1350 drivers/usb/core/driver.c:399 really_probe+0x4db/0xd90 drivers/base/dd.c:656 __driver_probe_device+0x2ab/0x5d0 drivers/base/dd.c:798 driver_probe_device+0x72/0x890 drivers/base/dd.c:828 __device_attach_driver+0x568/0x9e0 drivers/base/dd.c:956 bus_for_each_drv+0x403/0x620 drivers/base/bus.c:457 __device_attach+0x3c1/0x650 drivers/base/dd.c:1028 device_initial_probe+0x32/0x40 drivers/base/dd.c:1077 bus_probe_device+0x3dc/0x5c0 drivers/base/bus.c:532 device_add+0x13aa/0x1ba0 drivers/base/core.c:3679 usb_set_configuration+0x31c9/0x38d0 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0x109/0x2a0 drivers/usb/core/generic.c:254 usb_probe_device+0x3a7/0x690 drivers/usb/core/driver.c:294 really_probe+0x4db/0xd90 drivers/base/dd.c:656 __driver_probe_device+0x2ab/0x5d0 drivers/base/dd.c:798 driver_probe_device+0x72/0x890 drivers/base/dd.c:828 __device_attach_driver+0x568/0x9e0 drivers/base/dd.c:956 bus_for_each_drv+0x403/0x620 drivers/base/bus.c:457 __device_attach+0x3c1/0x650 drivers/base/dd.c:1028 device_initial_probe+0x32/0x40 drivers/base/dd.c:1077 bus_probe_device+0x3dc/0x5c0 drivers/base/bus.c:532 device_add+0x13aa/0x1ba0 drivers/base/core.c:3679 usb_new_device+0x15f4/0x2470 drivers/usb/core/hub.c:2651 hub_port_connect drivers/usb/core/hub.c:5521 [inline] hub_port_connect_change drivers/usb/core/hub.c:5661 [inline] port_event drivers/usb/core/hub.c:5821 [inline] hub_event+0x4ff8/0x72d0 drivers/usb/core/hub.c:5903 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312 worker_thread+0xea5/0x1520 kernel/workqueue.c:3390 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 CPU: 1 PID: 5060 Comm: sshd Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 =====================================================