skbuff: skb_over_panic: text:000000008eac7df8 len:76 put:20 head:00000000826688fe data:000000002d732043 tail:0xcc end:0xc0 dev:sit2 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:108! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1893 Comm: syz-fuzzer Tainted: G W 5.4.10-syzkaller-00217-gf5f770e495ba #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:104 Code: 56 84 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 cc 5c 56 fe 48 83 c4 20 <0f> 0b 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 RSP: 0000:ffff8881dbb09ae8 EFLAGS: 00010286 RAX: 0000000000000083 RBX: ffff8881c9826000 RCX: 46dde6854f942f00 RDX: 0000000000000502 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881dbb09b30 R08: ffffffff812cb190 R09: ffffed103b765dc0 R10: ffffed103b765dc0 R11: 0000000000000000 R12: ffff888148c3a880 R13: 00000000000000cc R14: 00000000000000c0 R15: dffffc0000000000 FS: 000000c4202b8490(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5d73d1db8 CR3: 00000001d3559004 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: skb_over_panic+0x2c/0x30 net/core/skbuff.c:113 skb_put+0x205/0x210 net/core/skbuff.c:1866 add_grhead net/ipv6/mcast.c:1717 [inline] add_grec+0xeef/0x12a0 net/ipv6/mcast.c:1844 mld_send_cr net/ipv6/mcast.c:1970 [inline] mld_ifc_timer_expire+0x781/0xc00 net/ipv6/mcast.c:2477 call_timer_fn+0x189/0x390 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0x926/0xb40 kernel/time/timer.c:1773 run_timer_softirq+0x1d/0x40 kernel/time/timer.c:1786 __do_softirq+0x235/0x57e kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x173/0x180 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x2e2/0x4c0 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0033:0x41d474 Code: 0f 83 51 01 00 00 48 85 ff 0f 84 40 01 00 00 41 83 fa 03 0f 83 2b 01 00 00 45 8d 42 01 44 0f b6 0b 49 89 ca 44 89 c1 41 d3 e9 <48> 83 ff 08 74 0b 41 0f ba e1 04 0f 83 db 00 00 00 41 0f ba e1 00 RSP: 002b:000000c420149e90 EFLAGS: 00000203 ORIG_RAX: ffffffffffffff13 RAX: 000000c420000000 RBX: 000000c41f8a07d3 RCX: 0000000000000002 RDX: 000000c443230000 RSI: 000000c42ebf0580 RDI: 0000000000000010 RBP: 000000c420149f28 R08: 0000000000000002 R09: 0000000000000037 R10: 0000000000000040 R11: 000000c42ebf0180 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000100 Modules linked in: ---[ end trace 15c33a7e6e4acd0e ]--- RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:104 Code: 56 84 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 cc 5c 56 fe 48 83 c4 20 <0f> 0b 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 RSP: 0000:ffff8881dbb09ae8 EFLAGS: 00010286 RAX: 0000000000000083 RBX: ffff8881c9826000 RCX: 46dde6854f942f00 RDX: 0000000000000502 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881dbb09b30 R08: ffffffff812cb190 R09: ffffed103b765dc0 R10: ffffed103b765dc0 R11: 0000000000000000 R12: ffff888148c3a880 R13: 00000000000000cc R14: 00000000000000c0 R15: dffffc0000000000 FS: 000000c4202b8490(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5d73d1db8 CR3: 00000001d3559004 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600