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Tue, 21 Oct 2025 07:17:02 -0700 (PDT) Date: Tue, 21 Oct 2025 07:17:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68f795de.050a0220.346f24.001d.GAE@google.com> Subject: Re: [syzbot] [wireless?] KMSAN: uninit-value in cfg80211_classify8021d From: syzbot To: linux-kernel@vger.kernel.org, listout@listout.xyz, syzkaller-bugs@googlegroups.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 cfg80211_classify8021d mac80211_hwsim hwsim9 wlan1: entered allmulticast mode ===================================================== BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180 __ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304 ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538 __netdev_start_xmit include/linux/netdevice.h:5248 [inline] netdev_start_xmit include/linux/netdevice.h:5257 [inline] xmit_one net/core/dev.c:3845 [inline] dev_hard_start_xmit+0x22f/0xa30 net/core/dev.c:3861 __dev_queue_xmit+0x3c51/0x5e60 net/core/dev.c:4763 dev_queue_xmit include/linux/netdevice.h:3365 [inline] packet_xmit+0x8f/0x710 net/packet/af_packet.c:275 packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x333/0x3d0 net/socket.c:742 __sys_sendto+0x593/0x720 net/socket.c:2244 __do_sys_sendto net/socket.c:2251 [inline] __se_sys_sendto net/socket.c:2247 [inline] __x64_sys_sendto+0x130/0x200 net/socket.c:2247 x64_sys_call+0x3924/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 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:4969 [inline] slab_alloc_node mm/slub.c:5272 [inline] kmem_cache_alloc_node_noprof+0x989/0x16b0 mm/slub.c:5324 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_skb_with_frags+0xc5/0xa60 net/core/skbuff.c:6671 sock_alloc_send_pskb+0xacc/0xc60 net/core/sock.c:2965 packet_alloc_skb net/packet/af_packet.c:2926 [inline] packet_snd net/packet/af_packet.c:3019 [inline] packet_sendmsg+0x743d/0xa2a0 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x333/0x3d0 net/socket.c:742 __sys_sendto+0x593/0x720 net/socket.c:2244 __do_sys_sendto net/socket.c:2251 [inline] __se_sys_sendto net/socket.c:2247 [inline] __x64_sys_sendto+0x130/0x200 net/socket.c:2247 x64_sys_call+0x3924/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 6608 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ===================================================== Tested on: commit: 6548d364 Merge tag 'cgroup-for-6.18-rc2-fixes' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15830d2f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=bbd3e7f3c2e28265 dashboard link: https://syzkaller.appspot.com/bug?extid=878ddc3962f792e9af59 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=14e3fde2580000