skbuff: skb_over_panic: text:ffffffff83b2a0af len:76 put:20 head:ffff8881e8585c00 data:ffff8881e8585c40 tail:0x8c end:0x80 dev:ip6gretap0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 296 Comm: syz-fuzzer Not tainted 5.4.197-syzkaller-00012-g27e532874a0e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:skb_panic+0x14a/0x150 net/core/skbuff.c:105 Code: f1 ee 84 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 bf 62 c5 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: 0000:ffff8881f6f09b28 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff8881e6af4000 RCX: 3fa8db27dc9d5300 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffff8881e8585c00 R08: ffffffff814a983a R09: ffffed103edeaa08 R10: ffffed103edeaa08 R11: 1ffff1103edeaa07 R12: 000000000000008c R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881e8585c40 FS: 000000c000032090(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc14207cb8 CR3: 00000001decbb000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic net/core/skbuff.c:114 [inline] skb_put+0x148/0x1f0 net/core/skbuff.c:1877 add_grhead net/ipv6/mcast.c:1714 [inline] add_grec+0xe4f/0x1350 net/ipv6/mcast.c:1841 mld_send_cr net/ipv6/mcast.c:1967 [inline] mld_ifc_timer_expire+0x723/0xb30 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+0x5b0/0x6b0 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 RIP: 0033:0x46631d Code: 8b 44 24 20 b9 40 42 0f 00 f7 f1 48 89 04 24 b8 e8 03 00 00 f7 e2 48 89 44 24 08 48 89 e7 be 00 00 00 00 b8 23 00 00 00 0f 05 <48> 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc cc cc cc cc cc cc RSP: 002b:000000c000041f10 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000014 RCX: 000000000046631d RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c000041f10 RBP: 000000c000041f20 R08: 00000000000694eb R09: 00007fff04fd60b8 R10: 000000000004ab12 R11: 0000000000000202 R12: 000000c000041f10 R13: 000000c01158f400 R14: 000000c0000004e0 R15: 00007f6354004b82 Modules linked in: ---[ end trace 731499cad326d0eb ]--- RIP: 0010:skb_panic+0x14a/0x150 net/core/skbuff.c:105 Code: f1 ee 84 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 bf 62 c5 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: 0000:ffff8881f6f09b28 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff8881e6af4000 RCX: 3fa8db27dc9d5300 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffff8881e8585c00 R08: ffffffff814a983a R09: ffffed103edeaa08 R10: ffffed103edeaa08 R11: 1ffff1103edeaa07 R12: 000000000000008c R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881e8585c40 FS: 000000c000032090(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc14207cb8 CR3: 00000001decbb000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400