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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
 __preempt_count_add arch/x86/include/asm/preempt.h:79 [inline]
 rcu_read_lock_sched_notrace include/linux/rcupdate.h:881 [inline]
 find_stack lib/stackdepot.c:550 [inline]
 stack_depot_save_flags+0x168/0x6e0 lib/stackdepot.c:618
 stack_depot_save+0x12/0x20 lib/stackdepot.c:685
 __msan_poison_alloca+0x106/0x1b0 mm/kmsan/instrumentation.c:285
 arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline]
 arch_local_irq_save arch/x86/include/asm/irqflags.h:103 [inline]
 percpu_counter_add_batch+0x43/0x290 lib/percpu_counter.c:92
 percpu_counter_add include/linux/percpu_counter.h:71 [inline]
 add_mm_counter include/linux/mm.h:2601 [inline]
 add_mm_rss_vec mm/memory.c:479 [inline]
 zap_pte_range mm/memory.c:1666 [inline]
 zap_pmd_range mm/memory.c:1722 [inline]
 zap_pud_range mm/memory.c:1751 [inline]
 zap_p4d_range mm/memory.c:1772 [inline]
 unmap_page_range+0x650d/0x7f40 mm/memory.c:1793
 unmap_single_vma+0x380/0x490 mm/memory.c:1839
 unmap_vmas+0x34a/0x610 mm/memory.c:1883
 exit_mmap+0x281/0xe00 mm/mmap.c:3269
 __mmput+0x147/0x5d0 kernel/fork.c:1346
 mmput+0x8a/0xa0 kernel/fork.c:1368
 exec_mmap+0x815/0x9b0 fs/exec.c:1052
 begin_new_exec+0x1ac4/0x2bd0 fs/exec.c:1318
 load_elf_binary+0x141e/0x4e30 fs/binfmt_elf.c:996
 search_binary_handler fs/exec.c:1786 [inline]
 exec_binprm fs/exec.c:1828 [inline]
 bprm_execve+0xc57/0x21c0 fs/exec.c:1880
 do_execveat_common+0xceb/0xd70 fs/exec.c:1987
 do_execve fs/exec.c:2061 [inline]
 __do_sys_execve fs/exec.c:2137 [inline]
 __se_sys_execve fs/exec.c:2132 [inline]
 __x64_sys_execve+0xf4/0x130 fs/exec.c:2132
 x64_sys_call+0x1612/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:60
 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: 4794 Comm: dhcpcd-run-hook Not tainted 6.9.0-syzkaller-08284-gea5f6ad9ad96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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