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Date: Sat, 25 May 2024 09:12:26 -0700 From: syzbot <syzbot+799fbb6d9e02a7a1d62b@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, eperezma@...hat.com, jasowang@...hat.com, kuba@...nel.org, linux-kernel@...r.kernel.org, mst@...hat.com, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, virtualization@...ts.linux.dev, xuanzhuo@...ux.alibaba.com Subject: [syzbot] [net?] [virt?] upstream test error: KMSAN: uninit-value in receive_buf Hello, syzbot found the following issue on: HEAD commit: 56fb6f92854f Merge tag 'drm-next-2024-05-25' of https://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=157a5462980000 kernel config: https://syzkaller.appspot.com/x/.config?x=1b6c22bca89a3565 dashboard link: https://syzkaller.appspot.com/bug?extid=799fbb6d9e02a7a1d62b 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/39a256e13faa/disk-56fb6f92.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d4ecc47a8198/vmlinux-56fb6f92.xz kernel image: https://storage.googleapis.com/syzbot-assets/0d37bfdfb0ca/bzImage-56fb6f92.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+799fbb6d9e02a7a1d62b@...kaller.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+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_shadow_origin_ptr+0x86/0xb0 mm/kmsan/shadow.c:116 get_shadow_origin_ptr mm/kmsan/instrumentation.c:36 [inline] __msan_metadata_ptr_for_load_4+0x24/0x40 mm/kmsan/instrumentation.c:91 stack_trace_consume_entry+0x16f/0x1e0 kernel/stacktrace.c:94 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:3946 [inline] slab_alloc_node mm/slub.c:4000 [inline] __do_kmalloc_node mm/slub.c:4120 [inline] __kmalloc_noprof+0x660/0xf30 mm/slub.c:4134 kmalloc_noprof include/linux/slab.h:664 [inline] tomoyo_realpath_from_path+0x104/0xaa0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x1ef/0xc50 security/tomoyo/file.c:771 tomoyo_file_open+0x271/0x360 security/tomoyo/tomoyo.c:334 security_file_open+0x9a/0xc60 security/security.c:2962 do_dentry_open+0x5b1/0x22b0 fs/open.c:942 vfs_open+0x49/0x60 fs/open.c:1089 do_open fs/namei.c:3650 [inline] path_openat+0x4ab0/0x5b70 fs/namei.c:3807 do_filp_open+0x20e/0x590 fs/namei.c:3834 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_sys_openat fs/open.c:1436 [inline] __se_sys_openat fs/open.c:1431 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1431 x64_sys_call+0x128b/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: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: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+0x18c0/0x3b90 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: 4772 Comm: ssh-keygen Not tainted 6.9.0-syzkaller-12277-g56fb6f92854f #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@...glegroups.com. 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
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