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+c5336dcd1b741349d27a@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== 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 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
