skbuff: skb_over_panic: text:ffffffff82b1fe93 len:184 put:172 head:ffff8881ec88a800 data:ffff8881ec88a800 tail:0xb8 end:0x80 dev: ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 365 Comm: udevd Not tainted 5.4.147-syzkaller-00036-geb4a5a5dbd5b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x14d/0x150 net/core/skbuff.c:105 Code: 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 49 89 e9 b8 00 00 00 00 53 41 55 41 54 41 57 e8 b3 a0 ed fd 48 83 c4 20 <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 4d 89 cd 4c 89 RSP: 0018:ffff8881f6f09460 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff851bda80 RCX: ffb4c10b33fdd800 RDX: 0000000080000703 RSI: 0000000080000703 RDI: 0000000000000000 RBP: ffff8881ec88a800 R08: ffffffff814b2a4c R09: ffffed103ede9608 R10: ffffed103ede9608 R11: 0000000000000000 R12: 00000000000000b8 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881ec88a800 FS: 00007f995d48d840(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005583924d9148 CR3: 00000001eee79000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic+0x25/0x30 net/core/skbuff.c:114 skb_put+0x1e0/0x1e0 net/core/skbuff.c:1877 skb_put_zero include/linux/skbuff.h:2251 [inline] cdc_ncm_ndp drivers/net/usb/cdc_ncm.c:1104 [inline] cdc_ncm_fill_tx_frame+0xcf3/0x2be0 drivers/net/usb/cdc_ncm.c:1211 cdc_ncm_tx_fixup+0x62/0xa0 drivers/net/usb/cdc_ncm.c:1405 usbnet_start_xmit+0x107/0x1a10 drivers/net/usb/usbnet.c:1363 __netdev_start_xmit include/linux/netdevice.h:4510 [inline] netdev_start_xmit include/linux/netdevice.h:4524 [inline] xmit_one+0xfa/0x470 net/core/dev.c:3203 dev_hard_start_xmit+0xac/0x1b0 net/core/dev.c:3219 sch_direct_xmit+0x212/0x8f0 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x1ea/0x3a0 net/sched/sch_generic.c:409 qdisc_run include/net/pkt_sched.h:121 [inline] __dev_xmit_skb net/core/dev.c:3395 [inline] __dev_queue_xmit+0xc07/0x2c30 net/core/dev.c:3748 neigh_output include/net/neighbour.h:519 [inline] ip6_finish_output2+0xf45/0x1810 net/ipv6/ip6_output.c:144 NF_HOOK_COND include/linux/netfilter.h:297 [inline] ip6_output+0x158/0x380 net/ipv6/ip6_output.c:242 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] mld_sendpack+0x540/0xa20 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x804/0xb30 net/ipv6/mcast.c:2474 call_timer_fn+0x30/0x330 kernel/time/timer.c:1418 expire_timers+0x21e/0x3f0 kernel/time/timer.c:1463 __run_timers+0x573/0x670 kernel/time/timer.c:1787 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800 __do_softirq+0x23e/0x615 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+0x113/0x420 arch/x86/kernel/apic/apic.c:1150 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:831 RIP: 0010:rol32 include/linux/bitops.h:90 [inline] RIP: 0010:jhash2 include/linux/jhash.h:138 [inline] RIP: 0010:hash_stack lib/stackdepot.c:156 [inline] RIP: 0010:stack_depot_save+0xe9/0x470 lib/stackdepot.c:237 Code: 02 74 0a 41 83 f8 03 75 4e 44 03 6e 08 03 7e 04 03 06 41 31 fd 89 f9 c1 c1 0e 41 29 cd 44 31 e8 44 89 e9 c1 c1 0b 29 c8 31 c7 <89> c1 c1 c1 19 29 cf 41 31 fd 89 f9 c1 c1 10 41 29 cd 44 31 e8 44 RSP: 0018:ffff8881d92af8a8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 000000009ec11d78 RBX: 0000000000000008 RCX: 00000000064cb54a RDX: 0000000000000800 RSI: ffff8881d92af92c RDI: 00000000809945be RBP: 000000005d92cb55 R08: 0000000000000001 R09: 0000000000000008 R10: ffffffff84600000 R11: 0000000000000000 R12: 0000000000001000 R13: 00000000a940c996 R14: ffff8881d92af8f0 R15: ffff8881d92af8f0 save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1f5/0x240 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1493 slab_free mm/slub.c:3073 [inline] kmem_cache_free+0xb8/0x5f0 mm/slub.c:3089 putname fs/namei.c:262 [inline] filename_lookup+0x471/0x630 fs/namei.c:2432 user_path_at include/linux/namei.h:49 [inline] vfs_statx+0xbf/0x1a0 fs/stat.c:187 vfs_fstatat include/linux/fs.h:3367 [inline] __do_sys_newfstatat fs/stat.c:368 [inline] __se_sys_newfstatat+0x60/0x6d0 fs/stat.c:362 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f995d5e41da Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 0b 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 69 fc 0c 00 f7 RSP: 002b:00007ffcb9317da8 EFLAGS: 00000206 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 00005583924c5d60 RCX: 00007f995d5e41da RDX: 00007ffcb9317db8 RSI: 00007ffcb9317e48 RDI: 00000000ffffff9c RBP: 00005583909df156 R08: 00005583909df156 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 0000000000000000 R13: 00005583924c5e50 R14: 00007ffcb9317e48 R15: 00005583909dea7c Modules linked in: ---[ end trace f4e248aafb5193d2 ]--- RIP: 0010:skb_panic+0x14d/0x150 net/core/skbuff.c:105 Code: 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 49 89 e9 b8 00 00 00 00 53 41 55 41 54 41 57 e8 b3 a0 ed fd 48 83 c4 20 <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 4d 89 cd 4c 89 RSP: 0018:ffff8881f6f09460 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff851bda80 RCX: ffb4c10b33fdd800 RDX: 0000000080000703 RSI: 0000000080000703 RDI: 0000000000000000 RBP: ffff8881ec88a800 R08: ffffffff814b2a4c R09: ffffed103ede9608 R10: ffffed103ede9608 R11: 0000000000000000 R12: 00000000000000b8 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881ec88a800 FS: 00007f995d48d840(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005583924d9148 CR3: 00000001eee79000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 02 74 0a 41 add 0x41(%rdx,%rcx,1),%dh 4: 83 f8 03 cmp $0x3,%eax 7: 75 4e jne 0x57 9: 44 03 6e 08 add 0x8(%rsi),%r13d d: 03 7e 04 add 0x4(%rsi),%edi 10: 03 06 add (%rsi),%eax 12: 41 31 fd xor %edi,%r13d 15: 89 f9 mov %edi,%ecx 17: c1 c1 0e rol $0xe,%ecx 1a: 41 29 cd sub %ecx,%r13d 1d: 44 31 e8 xor %r13d,%eax 20: 44 89 e9 mov %r13d,%ecx 23: c1 c1 0b rol $0xb,%ecx 26: 29 c8 sub %ecx,%eax 28: 31 c7 xor %eax,%edi * 2a: 89 c1 mov %eax,%ecx <-- trapping instruction 2c: c1 c1 19 rol $0x19,%ecx 2f: 29 cf sub %ecx,%edi 31: 41 31 fd xor %edi,%r13d 34: 89 f9 mov %edi,%ecx 36: c1 c1 10 rol $0x10,%ecx 39: 41 29 cd sub %ecx,%r13d 3c: 44 31 e8 xor %r13d,%eax 3f: 44 rex.R