===================================================== BUG: KMSAN: uninit-value in receive_mergeable drivers/net/virtio_net.c:1847 [inline] BUG: KMSAN: uninit-value in receive_buf+0x2620/0x6070 drivers/net/virtio_net.c:1973 receive_mergeable drivers/net/virtio_net.c:1847 [inline] receive_buf+0x2620/0x6070 drivers/net/virtio_net.c:1973 virtnet_receive drivers/net/virtio_net.c:2277 [inline] virtnet_poll+0xd1c/0x23c0 drivers/net/virtio_net.c:2380 __napi_poll+0xe7/0x980 net/core/dev.c:6722 napi_poll net/core/dev.c:6791 [inline] net_rx_action+0x82a/0x1850 net/core/dev.c:6907 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 preempt_count arch/x86/include/asm/preempt.h:26 [inline] check_kcov_mode kernel/kcov.c:173 [inline] write_comp_data kernel/kcov.c:236 [inline] __sanitizer_cov_trace_const_cmp4+0x1c/0x90 kernel/kcov.c:304 on_stack+0x96/0x1b0 arch/x86/include/asm/stacktrace.h:58 update_stack_state+0xc1/0x270 arch/x86/kernel/unwind_frame.c:228 unwind_next_frame+0x19a/0x470 arch/x86/kernel/unwind_frame.c:315 arch_stack_walk+0x1ec/0x2d0 arch/x86/kernel/stacktrace.c:25 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 __msan_chain_origin+0xc3/0x150 mm/kmsan/instrumentation.c:251 tlb_update_vma_flags include/asm-generic/tlb.h:450 [inline] tlb_start_vma include/asm-generic/tlb.h:544 [inline] change_protection_range mm/mprotect.c:498 [inline] change_protection+0x55cd/0x5860 mm/mprotect.c:542 mprotect_fixup+0xd18/0x1200 mm/mprotect.c:655 do_mprotect_pkey+0x109c/0x1980 mm/mprotect.c:820 __do_sys_mprotect mm/mprotect.c:841 [inline] __se_sys_mprotect mm/mprotect.c:838 [inline] __x64_sys_mprotect+0x9b/0xf0 mm/mprotect.c:838 x64_sys_call+0x2e86/0x3b90 arch/x86/include/generated/asm/syscalls_64.h:11 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: __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4706 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265 alloc_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2336 skb_page_frag_refill+0x2bf/0x7c0 net/core/sock.c:2920 virtnet_rq_alloc+0x43/0xbb0 drivers/net/virtio_net.c:882 add_recvbuf_mergeable drivers/net/virtio_net.c:2128 [inline] try_fill_recv+0x3f0/0x2f50 drivers/net/virtio_net.c:2173 virtnet_open+0x1cc/0xb00 drivers/net/virtio_net.c:2452 __dev_open+0x546/0x6f0 net/core/dev.c:1472 __dev_change_flags+0x309/0x9a0 net/core/dev.c:8781 dev_change_flags+0x8e/0x1d0 net/core/dev.c:8853 devinet_ioctl+0x13ec/0x22c0 net/ipv4/devinet.c:1177 inet_ioctl+0x4bd/0x6d0 net/ipv4/af_inet.c:1003 sock_do_ioctl+0xb7/0x540 net/socket.c:1222 sock_ioctl+0x727/0xd70 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:893 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:893 x64_sys_call+0x18c0/0x3b90 arch/x86/include/generated/asm/syscalls_64.h:17 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 CPU: 0 PID: 4768 Comm: dhcpcd-run-hook Not tainted 6.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 =====================================================