skbuff: skb_over_panic: text:ffffffff82c3fc69 len:184 put:172 head:ffff8881e1266800 data:ffff8881e1266800 tail:0xb8 end:0x80 dev:<NULL> ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 2206 Comm: udevd Not tainted 5.4.210-syzkaller-00006-gc80a5b2e7f63 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:skb_panic+0x14a/0x150 net/core/skbuff.c:105 Code: f4 2e 85 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 49 89 e9 31 c0 53 41 55 41 54 41 57 e8 c1 8d d0 00 48 83 c4 20 <0f> 0b 0f 1f 40 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 4d 89 RSP: 0018:ffff8881f6f09048 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff852ef500 RCX: 383a564d35436100 RDX: 0000000080000703 RSI: 0000000080000703 RDI: 0000000000000000 RBP: ffff8881e1266800 R08: ffffffff814e34d7 R09: 0000000000000003 R10: ffffed103ede117d R11: 1ffff1103ede117c R12: 00000000000000b8 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881e1266800 FS: 00007f1447894840(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffedeb6dfb8 CR3: 00000001dc9d2000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> skb_over_panic net/core/skbuff.c:114 [inline] skb_put+0x148/0x1f0 net/core/skbuff.c:1877 skb_put_zero include/linux/skbuff.h:2267 [inline] cdc_ncm_ndp drivers/net/usb/cdc_ncm.c:1106 [inline] cdc_ncm_fill_tx_frame+0xcd9/0x2ce0 drivers/net/usb/cdc_ncm.c:1213 cdc_ncm_tx_fixup+0x6c/0xb0 drivers/net/usb/cdc_ncm.c:1407 usbnet_start_xmit+0x109/0x18a0 drivers/net/usb/usbnet.c:1363 __netdev_start_xmit include/linux/netdevice.h:4519 [inline] netdev_start_xmit include/linux/netdevice.h:4533 [inline] xmit_one+0xfa/0x4a0 net/core/dev.c:3209 dev_hard_start_xmit+0xac/0x1b0 net/core/dev.c:3225 sch_direct_xmit+0x28c/0xa20 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x245/0x420 net/sched/sch_generic.c:409 qdisc_run include/net/pkt_sched.h:122 [inline] __dev_xmit_skb net/core/dev.c:3401 [inline] __dev_queue_xmit+0xd89/0x2a20 net/core/dev.c:3755 neigh_output include/net/neighbour.h:525 [inline] ip6_finish_output2+0xfb9/0x18d0 net/ipv6/ip6_output.c:144 NF_HOOK_COND include/linux/netfilter.h:297 [inline] ip6_output+0x1c1/0x420 net/ipv6/ip6_output.c:242 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] mld_sendpack+0x5e1/0xb00 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x864/0xc50 net/ipv6/mcast.c:2474 call_timer_fn+0x31/0x350 kernel/time/timer.c:1418 expire_timers+0x21e/0x400 kernel/time/timer.c:1463 __run_timers+0x5e0/0x700 kernel/time/timer.c:1787 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800 __do_softirq+0x23e/0x643 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:538 [inline] smp_apic_timer_interrupt+0x113/0x440 arch/x86/kernel/apic/apic.c:1150 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:831 </IRQ> RIP: 0010:putname+0x4b/0x150 fs/namei.c:255 Code: 89 fd 49 c1 ed 03 43 8a 44 25 00 84 c0 0f 85 ce 00 00 00 41 8b 1f bf 01 00 00 00 89 de e8 7d fe ca ff 85 db 0f 8e f3 00 00 00 <8d> 6b ff 43 8a 44 25 00 84 c0 0f 85 c5 00 00 00 41 89 2f bf 01 00 RSP: 0018:ffff8881dcbc7dc8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffffffff819a4400 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff8881ddb00fc0 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff8881dcbc7f10 R08: ffffffff819a44a3 R09: ffff8881dcbc7d60 R10: ffffed103b978fb0 R11: 1ffff1103b978fac R12: dffffc0000000000 R13: 1ffff1103be6b222 R14: ffff8881df359100 R15: ffff8881df359110 do_sys_open+0x63e/0x7e0 fs/open.c:1122 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f14479eb697 Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f RSP: 002b:00007ffcd049b8e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000055cc05e73860 RCX: 00007f14479eb697 RDX: 0000000000080000 RSI: 00007ffcd049b9f8 RDI: 00000000ffffff9c RBP: 00007ffcd049b9f8 R08: 000055cc04d8de6a R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000 R13: 000055cc05e73950 R14: 00007ffcd049b9f8 R15: 0000000000000002 Modules linked in: ---[ end trace 044dc00b2e9ac07d ]--- RIP: 0010:skb_panic+0x14a/0x150 net/core/skbuff.c:105 Code: f4 2e 85 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 49 89 e9 31 c0 53 41 55 41 54 41 57 e8 c1 8d d0 00 48 83 c4 20 <0f> 0b 0f 1f 40 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 4d 89 RSP: 0018:ffff8881f6f09048 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff852ef500 RCX: 383a564d35436100 RDX: 0000000080000703 RSI: 0000000080000703 RDI: 0000000000000000 RBP: ffff8881e1266800 R08: ffffffff814e34d7 R09: 0000000000000003 R10: ffffed103ede117d R11: 1ffff1103ede117c R12: 00000000000000b8 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881e1266800 FS: 00007f1447894840(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffedeb6dfb8 CR3: 00000001dc9d2000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 fd mov %edi,%ebp 2: 49 c1 ed 03 shr $0x3,%r13 6: 43 8a 44 25 00 mov 0x0(%r13,%r12,1),%al b: 84 c0 test %al,%al d: 0f 85 ce 00 00 00 jne 0xe1 13: 41 8b 1f mov (%r15),%ebx 16: bf 01 00 00 00 mov $0x1,%edi 1b: 89 de mov %ebx,%esi 1d: e8 7d fe ca ff callq 0xffcafe9f 22: 85 db test %ebx,%ebx 24: 0f 8e f3 00 00 00 jle 0x11d * 2a: 8d 6b ff lea -0x1(%rbx),%ebp <-- trapping instruction 2d: 43 8a 44 25 00 mov 0x0(%r13,%r12,1),%al 32: 84 c0 test %al,%al 34: 0f 85 c5 00 00 00 jne 0xff 3a: 41 89 2f mov %ebp,(%r15) 3d: bf .byte 0xbf 3e: 01 00 add %eax,(%rax)