===================================================== BUG: KMSAN: uninit-value in native_apic_mem_write+0x72/0x90 arch/x86/include/asm/apic.h:105 native_apic_mem_write+0x72/0x90 arch/x86/include/asm/apic.h:105 apic_eoi arch/x86/include/asm/apic.h:398 [inline] ack_APIC_irq arch/x86/include/asm/apic.h:444 [inline] __sysvec_reschedule_ipi arch/x86/kernel/smp.c:227 [inline] sysvec_reschedule_ipi+0x35/0x120 arch/x86/kernel/smp.c:225 asm_sysvec_reschedule_ipi+0x1f/0x30 arch/x86/include/asm/idtentry.h:654 check_kcov_mode kernel/kcov.c:173 [inline] write_comp_data kernel/kcov.c:236 [inline] __sanitizer_cov_trace_const_cmp4+0x22/0x90 kernel/kcov.c:304 __skb_dst_copy include/net/dst.h:275 [inline] skb_dst_copy include/net/dst.h:283 [inline] __copy_skb_header+0x1c6/0xac0 net/core/skbuff.c:1192 __skb_clone+0xa2/0xa40 net/core/skbuff.c:1243 skb_clone+0x4a9/0x670 net/core/skbuff.c:1721 dev_queue_xmit_nit+0x523/0x1400 net/core/dev.c:2258 xmit_one net/core/dev.c:3579 [inline] dev_hard_start_xmit+0x21d/0xb50 net/core/dev.c:3599 sch_direct_xmit+0x5f0/0x1400 net/sched/sch_generic.c:342 __dev_xmit_skb net/core/dev.c:3810 [inline] __dev_queue_xmit+0x3c80/0x6290 net/core/dev.c:4215 dev_queue_xmit include/linux/netdevice.h:3035 [inline] neigh_hh_output include/net/neighbour.h:530 [inline] neigh_output include/net/neighbour.h:544 [inline] ip_finish_output2+0x18d0/0x1b30 net/ipv4/ip_output.c:228 __ip_finish_output+0x364/0x970 ip_finish_output+0xa6/0x540 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x2f7/0x6e0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x21b1/0x2610 net/ipv4/ip_output.c:532 ip_queue_xmit+0xd1/0xf0 net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x4b58/0x5e90 net/ipv4/tcp_output.c:1399 __tcp_send_ack+0x747/0x9e0 net/ipv4/tcp_output.c:3983 tcp_send_ack+0x6c/0x90 net/ipv4/tcp_output.c:3989 __tcp_ack_snd_check+0x843/0xf20 net/ipv4/tcp_input.c:5536 tcp_ack_snd_check net/ipv4/tcp_input.c:5582 [inline] tcp_rcv_established+0x1770/0x2fe0 net/ipv4/tcp_input.c:6020 tcp_v4_do_rcv+0x85b/0x13e0 net/ipv4/tcp_ipv4.c:1721 tcp_v4_rcv+0x4ebd/0x53d0 net/ipv4/tcp_ipv4.c:2142 ip_protocol_deliver_rcu+0x2fd/0x1660 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x37f/0x5d0 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:302 [inline] ip_local_deliver+0x316/0x5b0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:454 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:630 [inline] ip_sublist_rcv+0x1165/0x14a0 net/ipv4/ip_input.c:638 ip_list_rcv+0x8f2/0x950 net/ipv4/ip_input.c:673 __netif_receive_skb_list_ptype net/core/dev.c:5525 [inline] __netif_receive_skb_list_core+0xe1b/0x1200 net/core/dev.c:5573 __netif_receive_skb_list net/core/dev.c:5625 [inline] netif_receive_skb_list_internal+0x109a/0x17a0 net/core/dev.c:5716 gro_normal_list include/net/gro.h:433 [inline] napi_complete_done+0x530/0xd30 net/core/dev.c:6056 virtqueue_napi_complete drivers/net/virtio_net.c:405 [inline] virtnet_poll+0x18d8/0x2490 drivers/net/virtio_net.c:1685 __napi_poll+0x144/0xbb0 net/core/dev.c:6485 napi_poll net/core/dev.c:6552 [inline] net_rx_action+0xa41/0x1a90 net/core/dev.c:6663 __do_softirq+0x211/0x818 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x117/0x260 kernel/softirq.c:650 irq_exit_rcu+0x12/0x20 kernel/softirq.c:662 common_interrupt+0xb8/0xd0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:640 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x6f/0xb0 kernel/locking/spinlock.c:194 unlock_hrtimer_base kernel/time/hrtimer.c:1017 [inline] hrtimer_start_range_ns+0x1624/0x1860 kernel/time/hrtimer.c:1301 hrtimer_start_expires include/linux/hrtimer.h:432 [inline] hrtimer_sleeper_start_expires kernel/time/hrtimer.c:1965 [inline] do_nanosleep+0x14c/0x8d0 kernel/time/hrtimer.c:2041 hrtimer_nanosleep+0x3d7/0x690 kernel/time/hrtimer.c:2097 common_nsleep+0x16f/0x1a0 kernel/time/posix-timers.c:1236 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1276 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1254 [inline] __x64_sys_clock_nanosleep+0x6ab/0x760 kernel/time/posix-timers.c:1254 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 Uninit was created at: slab_post_alloc_hook+0x271/0xf70 mm/slab.h:766 slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x586/0xb40 mm/slub.c:3476 skb_clone+0x3ec/0x670 net/core/skbuff.c:1714 dev_queue_xmit_nit+0x523/0x1400 net/core/dev.c:2258 xmit_one net/core/dev.c:3579 [inline] dev_hard_start_xmit+0x21d/0xb50 net/core/dev.c:3599 sch_direct_xmit+0x5f0/0x1400 net/sched/sch_generic.c:342 __dev_xmit_skb net/core/dev.c:3810 [inline] __dev_queue_xmit+0x3c80/0x6290 net/core/dev.c:4215 dev_queue_xmit include/linux/netdevice.h:3035 [inline] neigh_hh_output include/net/neighbour.h:530 [inline] neigh_output include/net/neighbour.h:544 [inline] ip_finish_output2+0x18d0/0x1b30 net/ipv4/ip_output.c:228 __ip_finish_output+0x364/0x970 ip_finish_output+0xa6/0x540 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x2f7/0x6e0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x21b1/0x2610 net/ipv4/ip_output.c:532 ip_queue_xmit+0xd1/0xf0 net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x4b58/0x5e90 net/ipv4/tcp_output.c:1399 __tcp_send_ack+0x747/0x9e0 net/ipv4/tcp_output.c:3983 tcp_send_ack+0x6c/0x90 net/ipv4/tcp_output.c:3989 __tcp_ack_snd_check+0x843/0xf20 net/ipv4/tcp_input.c:5536 tcp_ack_snd_check net/ipv4/tcp_input.c:5582 [inline] tcp_rcv_established+0x1770/0x2fe0 net/ipv4/tcp_input.c:6020 tcp_v4_do_rcv+0x85b/0x13e0 net/ipv4/tcp_ipv4.c:1721 tcp_v4_rcv+0x4ebd/0x53d0 net/ipv4/tcp_ipv4.c:2142 ip_protocol_deliver_rcu+0x2fd/0x1660 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x37f/0x5d0 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:302 [inline] ip_local_deliver+0x316/0x5b0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:454 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:630 [inline] ip_sublist_rcv+0x1165/0x14a0 net/ipv4/ip_input.c:638 ip_list_rcv+0x8f2/0x950 net/ipv4/ip_input.c:673 __netif_receive_skb_list_ptype net/core/dev.c:5525 [inline] __netif_receive_skb_list_core+0xe1b/0x1200 net/core/dev.c:5573 __netif_receive_skb_list net/core/dev.c:5625 [inline] netif_receive_skb_list_internal+0x109a/0x17a0 net/core/dev.c:5716 gro_normal_list include/net/gro.h:433 [inline] napi_complete_done+0x530/0xd30 net/core/dev.c:6056 virtqueue_napi_complete drivers/net/virtio_net.c:405 [inline] virtnet_poll+0x18d8/0x2490 drivers/net/virtio_net.c:1685 __napi_poll+0x144/0xbb0 net/core/dev.c:6485 napi_poll net/core/dev.c:6552 [inline] net_rx_action+0xa41/0x1a90 net/core/dev.c:6663 __do_softirq+0x211/0x818 kernel/softirq.c:571 CPU: 0 PID: 5015 Comm: syz-executor.4 Not tainted 6.2.0-rc8-syzkaller-80998-g9c866a280876 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 =====================================================