Hello, syzbot found the following issue on: HEAD commit: 94305e83eccb Merge tag 'pmdomain-v6.15-rc3' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16c9c170580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a423536a47898618 dashboard link: https://syzkaller.appspot.com/bug?extid=3d9e2c65bdd43a254924 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/82a518437203/disk-94305e83.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e1b8b32ab132/vmlinux-94305e83.xz kernel image: https://storage.googleapis.com/syzbot-assets/1743502cacb0/bzImage-94305e83.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3d9e2c65bdd43a254924@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in ieee80211_get_8023_tunnel_proto net/wireless/util.c:543 [inline] BUG: KMSAN: uninit-value in ieee80211_amsdu_to_8023s+0x2226/0x2a40 net/wireless/util.c:897 ieee80211_get_8023_tunnel_proto net/wireless/util.c:543 [inline] ieee80211_amsdu_to_8023s+0x2226/0x2a40 net/wireless/util.c:897 __ieee80211_rx_h_amsdu+0x902/0x1400 net/mac80211/rx.c:3078 ieee80211_rx_h_amsdu net/mac80211/rx.c:3164 [inline] ieee80211_rx_handlers+0x5b21/0x12440 net/mac80211/rx.c:4146 ieee80211_invoke_rx_handlers net/mac80211/rx.c:4190 [inline] ieee80211_prepare_and_rx_handle+0x4c39/0x9ce0 net/mac80211/rx.c:5040 __ieee80211_rx_handle_packet net/mac80211/rx.c:5245 [inline] ieee80211_rx_list+0x5f20/0x6120 net/mac80211/rx.c:5416 ieee80211_rx_napi+0x84/0x400 net/mac80211/rx.c:5439 ieee80211_rx include/net/mac80211.h:5179 [inline] ieee80211_handle_queued_frames+0x14f/0x350 net/mac80211/main.c:441 ieee80211_tasklet_handler+0x25/0x30 net/mac80211/main.c:460 tasklet_action_common+0x362/0xd70 kernel/softirq.c:829 tasklet_action+0x2d/0x40 kernel/softirq.c:855 handle_softirqs+0x169/0x6e0 kernel/softirq.c:579 __do_softirq+0x14/0x1b kernel/softirq.c:613 do_softirq+0x99/0x100 kernel/softirq.c:480 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:407 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline] __dev_queue_xmit+0x2e5d/0x5e20 net/core/dev.c:4656 dev_queue_xmit include/linux/netdevice.h:3350 [inline] __netlink_deliver_tap_skb net/netlink/af_netlink.c:307 [inline] __netlink_deliver_tap+0x93b/0xdd0 net/netlink/af_netlink.c:325 netlink_deliver_tap net/netlink/af_netlink.c:338 [inline] __netlink_sendskb net/netlink/af_netlink.c:1256 [inline] netlink_sendskb+0x224/0x270 net/netlink/af_netlink.c:1265 netlink_unicast+0x746/0x1290 net/netlink/af_netlink.c:1354 nlmsg_unicast include/net/netlink.h:1162 [inline] netlink_ack+0xacc/0xf80 net/netlink/af_netlink.c:2496 netlink_rcv_skb+0x3f9/0x680 net/netlink/af_netlink.c:2540 genl_rcv+0x41/0x60 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0xed8/0x1290 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 __sys_sendto+0x590/0x710 net/socket.c:2180 __do_compat_sys_socketcall net/compat.c:-1 [inline] __se_compat_sys_socketcall net/compat.c:423 [inline] __ia32_compat_sys_socketcall+0xa89/0x1af0 net/compat.c:423 ia32_sys_call+0x41be/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:103 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Uninit was created at: slab_post_alloc_hook mm/slub.c:4153 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4248 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:577 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:668 __netdev_alloc_skb+0x124/0x6a0 net/core/skbuff.c:732 netdev_alloc_skb include/linux/skbuff.h:3413 [inline] dev_alloc_skb include/linux/skbuff.h:3426 [inline] __ieee80211_amsdu_copy net/wireless/util.c:757 [inline] ieee80211_amsdu_to_8023s+0xcfa/0x2a40 net/wireless/util.c:885 __ieee80211_rx_h_amsdu+0x902/0x1400 net/mac80211/rx.c:3078 ieee80211_rx_h_amsdu net/mac80211/rx.c:3164 [inline] ieee80211_rx_handlers+0x5b21/0x12440 net/mac80211/rx.c:4146 ieee80211_invoke_rx_handlers net/mac80211/rx.c:4190 [inline] ieee80211_prepare_and_rx_handle+0x4c39/0x9ce0 net/mac80211/rx.c:5040 __ieee80211_rx_handle_packet net/mac80211/rx.c:5245 [inline] ieee80211_rx_list+0x5f20/0x6120 net/mac80211/rx.c:5416 ieee80211_rx_napi+0x84/0x400 net/mac80211/rx.c:5439 ieee80211_rx include/net/mac80211.h:5179 [inline] ieee80211_handle_queued_frames+0x14f/0x350 net/mac80211/main.c:441 ieee80211_tasklet_handler+0x25/0x30 net/mac80211/main.c:460 tasklet_action_common+0x362/0xd70 kernel/softirq.c:829 tasklet_action+0x2d/0x40 kernel/softirq.c:855 handle_softirqs+0x169/0x6e0 kernel/softirq.c:579 __do_softirq+0x14/0x1b kernel/softirq.c:613 CPU: 1 UID: 0 PID: 20119 Comm: syz.6.1299 Tainted: G W 6.15.0-rc7-syzkaller-00099-g94305e83eccb #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ===================================================== --- 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
