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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c2ee9f594da8 KVM: selftests: Fix build on on non-x86 archi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d2aa5f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=1673a5aaa7e19b23 dashboard link: https://syzkaller.appspot.com/bug?extid=0a884bc2d304ce4af70f compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12ee4c30580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16443640580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/df7d94abc0db/disk-c2ee9f59.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1945eac19921/vmlinux-c2ee9f59.xz kernel image: https://storage.googleapis.com/syzbot-assets/19b610273055/bzImage-c2ee9f59.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0a884bc2d304ce4af70f@syzkaller.appspotmail.com netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 ------------[ cut here ]------------ skb_assert_len WARNING: CPU: 0 PID: 5230 at include/linux/skbuff.h:2679 skb_assert_len include/linux/skbuff.h:2679 [inline] WARNING: CPU: 0 PID: 5230 at include/linux/skbuff.h:2679 __dev_queue_xmit+0x22cf/0x4350 net/core/dev.c:4345 Modules linked in: CPU: 0 UID: 0 PID: 5230 Comm: syz-executor319 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:skb_assert_len include/linux/skbuff.h:2679 [inline] RIP: 0010:__dev_queue_xmit+0x22cf/0x4350 net/core/dev.c:4345 Code: 27 31 9c f8 40 84 ed 75 25 e8 3d 2f 9c f8 c6 05 a6 22 15 07 01 90 48 c7 c6 40 dc 7a 8c 48 c7 c7 60 ab 7a 8c e8 f2 ad 5d f8 90 <0f> 0b 90 90 e8 18 2f 9c f8 0f b6 2d 80 22 15 07 31 ff 89 ee e8 e8 RSP: 0018:ffffc900034df188 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88807fcdba00 RCX: ffffffff814e38b9 RDX: ffff88801cb09e00 RSI: ffffffff814e38c6 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807fcdba10 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888074776000 FS: 000055555dc25380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 000000007444e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dev_queue_xmit include/linux/netdevice.h:3094 [inline] __netlink_deliver_tap_skb net/netlink/af_netlink.c:307 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:325 [inline] netlink_deliver_tap+0xa8a/0xcf0 net/netlink/af_netlink.c:338 __netlink_sendskb net/netlink/af_netlink.c:1275 [inline] netlink_sendskb net/netlink/af_netlink.c:1284 [inline] netlink_unicast+0x6b4/0x7f0 net/netlink/af_netlink.c:1372 nlmsg_unicast include/net/netlink.h:1158 [inline] genlmsg_unicast include/net/genetlink.h:549 [inline] genlmsg_reply include/net/genetlink.h:559 [inline] netdev_nl_queue_get_doit+0x37f/0x6a0 net/core/netdev-genl.c:405 genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2551 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2607 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2661 __sys_sendmsg+0x117/0x1f0 net/socket.c:2690 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f22f09cf9b9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc0ffdccf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f22f0a1d482 RCX: 00007f22f09cf9b9 RDX: 0000000000000810 RSI: 0000000020001640 RDI: 0000000000000004 RBP: 00007f22f0a1d460 R08: 0000555500000000 R09: 0000555500000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f22f0a1d3e5 R13: 0000000000000001 R14: 00007ffc0ffdcd40 R15: 0000000000000003 --- 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@googlegroups.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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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