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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
 kmsan_get_metadata+0x19e/0x1d0 mm/kmsan/shadow.c:151
 kmsan_get_shadow_origin_ptr+0x4d/0xb0 mm/kmsan/shadow.c:102
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:36 [inline]
 __msan_metadata_ptr_for_load_8+0x24/0x40 mm/kmsan/instrumentation.c:92
 unwind_get_return_address+0x76/0x140 arch/x86/kernel/unwind_frame.c:19
 arch_stack_walk+0x168/0x2d0 arch/x86/kernel/stacktrace.c:26
 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:3946 [inline]
 slab_alloc_node mm/slub.c:4002 [inline]
 kmem_cache_alloc_noprof+0x637/0xb20 mm/slub.c:4009
 getname_flags+0x102/0xa30 fs/namei.c:139
 getname+0x30/0x40 fs/namei.c:225
 do_sys_openat2+0xc3/0x2f0 fs/open.c:1410
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0x2a1/0x310 fs/open.c:1442
 x64_sys_call+0x120e/0x3b90 arch/x86/include/generated/asm/syscalls_64.h:258
 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+0x18bf/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: 4750 Comm: udevd Not tainted 6.10.0-syzkaller-01193-g408323581b72 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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