===================================================== BUG: KMSAN: uninit-value in receive_mergeable drivers/net/virtio_net.c:1839 [inline] BUG: KMSAN: uninit-value in receive_buf+0x25e3/0x5fd0 drivers/net/virtio_net.c:1955 receive_mergeable drivers/net/virtio_net.c:1839 [inline] receive_buf+0x25e3/0x5fd0 drivers/net/virtio_net.c:1955 virtnet_receive drivers/net/virtio_net.c:2259 [inline] virtnet_poll+0xd1c/0x23c0 drivers/net/virtio_net.c:2362 __napi_poll+0xe7/0x980 net/core/dev.c:6721 napi_poll net/core/dev.c:6790 [inline] net_rx_action+0x82a/0x1850 net/core/dev.c:6906 handle_softirqs+0x1d8/0x810 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 smap_restore arch/x86/include/asm/smap.h:56 [inline] get_shadow_origin_ptr mm/kmsan/instrumentation.c:37 [inline] __msan_metadata_ptr_for_load_4+0x2c/0x40 mm/kmsan/instrumentation.c:91 stack_trace_consume_entry+0x4f/0x1e0 kernel/stacktrace.c:86 arch_stack_walk+0x1ca/0x2d0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xaa/0xe0 kernel/stacktrace.c:122 kmsan_save_stack_with_flags mm/kmsan/core.c:74 [inline] kmsan_internal_poison_memory+0x49/0x90 mm/kmsan/core.c:58 kmsan_slab_alloc+0xdf/0x160 mm/kmsan/hooks.c:68 slab_post_alloc_hook mm/slub.c:3877 [inline] kmem_cache_alloc_bulk+0xab4/0x1480 mm/slub.c:4709 mt_alloc_bulk lib/maple_tree.c:167 [inline] mas_alloc_nodes+0x784/0xf00 lib/maple_tree.c:1264 mas_node_count_gfp lib/maple_tree.c:1322 [inline] mas_preallocate+0x183c/0x2730 lib/maple_tree.c:5556 vma_iter_prealloc mm/internal.h:1254 [inline] __split_vma+0x685/0x11e0 mm/mmap.c:2354 split_vma mm/mmap.c:2413 [inline] vma_modify+0x37c/0x4c0 mm/mmap.c:2454 vma_modify_flags include/linux/mm.h:3305 [inline] mprotect_fixup+0x7d7/0x1190 mm/mprotect.c:635 do_mprotect_pkey+0x1159/0x1850 mm/mprotect.c:809 __do_sys_mprotect mm/mprotect.c:830 [inline] __se_sys_mprotect mm/mprotect.c:827 [inline] __x64_sys_mprotect+0x9b/0xf0 mm/mprotect.c:827 x64_sys_call+0x2e55/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:11 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264 alloc_pages+0x1bf/0x1e0 mm/mempolicy.c:2335 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:2110 [inline] try_fill_recv+0x3f0/0x2f50 drivers/net/virtio_net.c:2155 virtnet_open+0x1cc/0xb00 drivers/net/virtio_net.c:2434 __dev_open+0x546/0x6f0 net/core/dev.c:1472 __dev_change_flags+0x309/0x9a0 net/core/dev.c:8780 dev_change_flags+0x8e/0x1d0 net/core/dev.c:8852 devinet_ioctl+0x13ec/0x22c0 net/ipv4/devinet.c:1177 inet_ioctl+0x4bd/0x6d0 net/ipv4/af_inet.c:1001 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:904 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 PID: 4813 Comm: dhcpcd-run-hook Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 =====================================================