On 2/12/25 14:41, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: febbc555cf0f Merge tag 'nfsd-6.14-1' of git://git.kernel.o.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=137a78e4580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=48f90cac5eea091a > dashboard link: https://syzkaller.appspot.com/bug?extid=1fcd957a82e3a1baa94d > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) > 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177a78e4580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16adc3f8580000 > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/f90f94285615/disk-febbc555.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/b8a8bb66806c/vmlinux-febbc555.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/c8af6c511559/bzImage-febbc555.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1fcd957a82e3a1baa...@syzkaller.appspotmail.com > > ===================================================== > BUG: KMSAN: uninit-value in string_nocheck lib/vsprintf.c:633 [inline] > BUG: KMSAN: uninit-value in string+0x3ec/0x5f0 lib/vsprintf.c:714 > string_nocheck lib/vsprintf.c:633 [inline] > string+0x3ec/0x5f0 lib/vsprintf.c:714 > vsnprintf+0xa5d/0x1960 lib/vsprintf.c:2843 > __request_module+0x252/0x9f0 kernel/module/kmod.c:149 > team_mode_get drivers/net/team/team_core.c:480 [inline] > team_change_mode drivers/net/team/team_core.c:607 [inline] > team_mode_option_set+0x437/0x970 drivers/net/team/team_core.c:1401 > team_option_set drivers/net/team/team_core.c:375 [inline] > team_nl_options_set_doit+0x1339/0x1f90 drivers/net/team/team_core.c:2661 > genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] > genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] > genl_rcv_msg+0x1214/0x12c0 net/netlink/genetlink.c:1210 > netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2543 > genl_rcv+0x40/0x60 net/netlink/genetlink.c:1219 > netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] > netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1348 > netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1892 > sock_sendmsg_nosec net/socket.c:718 [inline] > __sock_sendmsg+0x30f/0x380 net/socket.c:733 > ____sys_sendmsg+0x877/0xb60 net/socket.c:2573 > ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627 > __sys_sendmsg net/socket.c:2659 [inline] > __do_sys_sendmsg net/socket.c:2664 [inline] > __se_sys_sendmsg net/socket.c:2662 [inline] > __x64_sys_sendmsg+0x212/0x3c0 net/socket.c:2662 > x64_sys_call+0x2ed6/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:47 > 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: > slab_post_alloc_hook mm/slub.c:4121 [inline] > slab_alloc_node mm/slub.c:4164 [inline] > kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216 > kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587 > __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678 > alloc_skb include/linux/skbuff.h:1331 [inline] > netlink_alloc_large_skb+0x1b4/0x280 net/netlink/af_netlink.c:1196 > netlink_sendmsg+0xa96/0x11e0 net/netlink/af_netlink.c:1867 > sock_sendmsg_nosec net/socket.c:718 [inline] > __sock_sendmsg+0x30f/0x380 net/socket.c:733 > ____sys_sendmsg+0x877/0xb60 net/socket.c:2573 > ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627 > __sys_sendmsg net/socket.c:2659 [inline] > __do_sys_sendmsg net/socket.c:2664 [inline] > __se_sys_sendmsg net/socket.c:2662 [inline] > __x64_sys_sendmsg+0x212/0x3c0 net/socket.c:2662 > x64_sys_call+0x2ed6/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:47 > 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 UID: 0 PID: 5814 Comm: syz-executor989 Not tainted > 6.14.0-rc2-syzkaller-00034-gfebbc555cf0f #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 12/27/2024 > =====================================================
For the record in linux-modules, Eric Dumazet posted a fix for this issue at: https://lore.kernel.org/netdev/20250212134928.1541609-1-eduma...@google.com/ -- Petr
