[syzbot] [net?] [virt?] upstream boot error: KMSAN: uninit-value in receive_buf

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 8f6a15f095a6 Merge tag 'cocci-for-6.10' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1526be58980000
kernel config: https://syzkaller.appspot.com/x/.config?x=d66c5ffb962c9d5b
dashboard link: https://syzkaller.appspot.com/bug?extid=c5336dcd1b741349d27a
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b89e8eae93a7/disk-8f6a15f0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b4e90ba9ba00/vmlinux-8f6a15f0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/534e2e1e43eb/bzImage-8f6a15f0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c5336d...@syzkaller.appspotmail.com

=====================================================
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
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
acpi_safe_halt+0x25/0x30 drivers/acpi/processor_idle.c:112
acpi_idle_do_entry+0x22/0x40 drivers/acpi/processor_idle.c:573
acpi_idle_enter+0xa1/0xc0 drivers/acpi/processor_idle.c:707
cpuidle_enter_state+0xcb/0x250 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x7f/0xf0 drivers/cpuidle/cpuidle.c:388
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x551/0x750 kernel/sched/idle.c:332
cpu_startup_entry+0x65/0x80 kernel/sched/idle.c:430
rest_init+0x1e8/0x260 init/main.c:747
start_kernel+0x92c/0xa70 init/main.c:1103
x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x98/0xa0 arch/x86/kernel/head64.c:488
common_startup_64+0x12c/0x137

Uninit was created at:
__alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4683
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: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:907 [inline]
__se_sys_ioctl+0x261/0x450 fs/ioctl.c:893
__x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:893
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: 0 Comm: swapper/0 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================


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