skbuff: skb_over_panic: text:ffffffff8482be40 len:428 put:172 head:ffff888117e0e700 data:ffff888117e0e700 tail:0x1ac end:0x180 dev: ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:209! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 101 PID: 4195 Comm: dhcpcd Not tainted 6.14.0-rc6-syzkaller-00094-g434da42d7173 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:209 Code: b6 04 01 84 c0 74 04 3c 03 7e 21 8b 4b 70 41 56 45 89 e8 48 c7 c7 80 c7 f9 87 41 57 56 48 89 ee 52 4c 89 e2 e8 0a 9a 5e fb 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 a4 17 d9 fb 4c RSP: 0018:ffffc9000389f1d8 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff88810f3318c0 RCX: ffffffff815b0099 RDX: 0000000000000000 RSI: ffffffff815b640e RDI: 0000000000000005 RBP: ffffffff87f9db20 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000403 R11: 0000000000000001 R12: ffffffff8482be40 R13: 00000000000000ac R14: ffffffff87f9c740 R15: 0000000000000180 FS: 00007fd6e0e2b740(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc36609d98 CR3: 00000001156a0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic net/core/skbuff.c:214 [inline] skb_put+0x174/0x1b0 net/core/skbuff.c:2527 skb_put_zero include/linux/skbuff.h:2737 [inline] cdc_ncm_ndp16 drivers/net/usb/cdc_ncm.c:1136 [inline] cdc_ncm_fill_tx_frame+0x2930/0x38b0 drivers/net/usb/cdc_ncm.c:1311 cdc_ncm_tx_fixup+0xed/0x140 drivers/net/usb/cdc_ncm.c:1538 usbnet_start_xmit+0x162/0x2780 drivers/net/usb/usbnet.c:1379 __netdev_start_xmit include/linux/netdevice.h:5151 [inline] netdev_start_xmit include/linux/netdevice.h:5160 [inline] xmit_one net/core/dev.c:3800 [inline] dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3816 sch_direct_xmit+0x190/0x840 net/sched/sch_generic.c:343 __dev_xmit_skb net/core/dev.c:4039 [inline] __dev_queue_xmit+0x13d3/0x43e0 net/core/dev.c:4615 dev_queue_xmit include/linux/netdevice.h:3313 [inline] packet_xmit+0x246/0x360 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3132 [inline] packet_sendmsg+0x274c/0x56f0 net/packet/af_packet.c:3164 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:733 [inline] sock_write_iter+0x4fe/0x5b0 net/socket.c:1137 do_iter_readv_writev+0x5be/0x890 fs/read_write.c:820 vfs_writev+0x363/0xdd0 fs/read_write.c:1050 do_writev+0x297/0x340 fs/read_write.c:1096 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: 0033:0x7fd6e0ef9e03 Code: 89 c7 48 89 44 24 08 e8 6a f2 f9 ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 14 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6d 48 8b 15 f6 5f 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffc36609d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007ffc36619fe8 RCX: 00007fd6e0ef9e03 RDX: 0000000000000002 RSI: 00007ffc36609d50 RDI: 0000000000000005 RBP: 000055e1aa8369c7 R08: 0000000042424242 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000055e1dc389460 R14: 00007ffc36609de8 R15: 00007ffc36609d98 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:209 Code: b6 04 01 84 c0 74 04 3c 03 7e 21 8b 4b 70 41 56 45 89 e8 48 c7 c7 80 c7 f9 87 41 57 56 48 89 ee 52 4c 89 e2 e8 0a 9a 5e fb 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 a4 17 d9 fb 4c RSP: 0018:ffffc9000389f1d8 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff88810f3318c0 RCX: ffffffff815b0099 RDX: 0000000000000000 RSI: ffffffff815b640e RDI: 0000000000000005 RBP: ffffffff87f9db20 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000403 R11: 0000000000000001 R12: ffffffff8482be40 R13: 00000000000000ac R14: ffffffff87f9c740 R15: 0000000000000180 FS: 00007fd6e0e2b740(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc36609d98 CR3: 00000001156a0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400