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Wed, 11 Mar 2026 11:04:03 -0700 (PDT) Date: Wed, 11 Mar 2026 11:04:03 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b1ae93.050a0220.209d0e.0004.GAE@google.com> Subject: Re: [syzbot] [bridge?] KMSAN: uninit-value in netif_skb_features (4) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, yss2813483011xxl@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in netif_skb_features ===================================================== BUG: KMSAN: uninit-value in gso_features_check net/core/dev.c:3816 [inline] BUG: KMSAN: uninit-value in netif_skb_features+0x15fc/0x1a50 net/core/dev.c:3841 gso_features_check net/core/dev.c:3816 [inline] netif_skb_features+0x15fc/0x1a50 net/core/dev.c:3841 validate_xmit_skb+0xb6/0x2400 net/core/dev.c:4016 validate_xmit_skb_list+0xd4/0x320 net/core/dev.c:4078 sch_direct_xmit+0xd4/0xcf0 net/sched/sch_generic.c:332 __dev_xmit_skb net/core/dev.c:4192 [inline] __dev_queue_xmit+0x301d/0x5980 net/core/dev.c:4808 dev_queue_xmit include/linux/netdevice.h:3384 [inline] packet_xmit+0x8f/0x710 net/packet/af_packet.c:275 packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x91d9/0xa320 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xf37/0xfd0 net/socket.c:2592 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681 x64_sys_call+0x1e20/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4549 [inline] slab_alloc_node mm/slub.c:4869 [inline] kmem_cache_alloc_node_noprof+0x3cd/0x12d0 mm/slub.c:4921 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x855/0x1190 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_skb_with_frags+0xc5/0xa60 net/core/skbuff.c:6763 sock_alloc_send_pskb+0xacb/0xc60 net/core/sock.c:2995 packet_alloc_skb net/packet/af_packet.c:2926 [inline] packet_snd net/packet/af_packet.c:3019 [inline] packet_sendmsg+0x7477/0xa320 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xf37/0xfd0 net/socket.c:2592 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681 x64_sys_call+0x1e20/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 6599 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 ===================================================== Tested on: commit: 80234b5a Merge tag 'rproc-v7.0-fixes' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=109504d6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=242f02fcd3fbc8f3 dashboard link: https://syzkaller.appspot.com/bug?extid=1543a7d954d9c6d00407 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1241b75a580000