skbuff: skb_over_panic: text:ffffffff843b7b13 len:56 put:8 head:ffff8881173de400 data:ffff8881173de450 tail:0x88 end:0x80 dev:ip6gretap1 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5636 Comm: syz-executor.5 Not tainted 5.10.76-syzkaller-01178-g4944ec82ebb9 #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:106 Code: 87 85 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 3c 5d 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc900001609d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff888156bd2000 RCX: 7a011a94de612f00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000160a18 R08: ffffffff81545288 R09: ffffed103ee295d8 R10: ffffed103ee295d8 R11: 0000000000000000 R12: ffff8881173de450 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00005555562b4400(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd1b877fd8 CR3: 0000000153199000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic+0x2c/0x30 net/core/skbuff.c:115 skb_put+0x205/0x210 net/core/skbuff.c:1877 mld_newpack+0x653/0x9c0 net/ipv6/mcast.c:1626 add_grhead net/ipv6/mcast.c:1707 [inline] add_grec+0xf40/0x1370 net/ipv6/mcast.c:1838 mld_send_cr net/ipv6/mcast.c:1964 [inline] mld_ifc_timer_expire+0x781/0xc50 net/ipv6/mcast.c:2471 call_timer_fn+0x35/0x280 kernel/time/timer.c:1420 expire_timers+0x21f/0x3b0 kernel/time/timer.c:1465 __run_timers+0x548/0x680 kernel/time/timer.c:1756 run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1769 __do_softirq+0x27e/0x598 kernel/softirq.c:305 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:402 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:432 irq_exit_rcu+0x9/0x10 kernel/softirq.c:444 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1095 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:do_ipv6_getsockopt net/ipv6/ipv6_sockglue.c:1122 [inline] RIP: 0010:ipv6_getsockopt+0x2b11/0x3710 net/ipv6/ipv6_sockglue.c:1477 Code: 4c 89 f7 e8 11 4f 6f fd e9 65 d6 ff ff 44 89 e9 80 e1 07 fe c1 38 c1 0f 8c d0 d6 ff ff 4c 89 ef e8 14 4f 6f fd e9 c3 d6 ff ff <48> 8d 8c 24 70 04 00 00 80 e1 07 80 c1 03 38 c1 0f 8c 5b d7 ff ff RSP: 0018:ffffc90001edf440 EFLAGS: 00000202 RAX: dffffc0000000004 RBX: ffff888115578d88 RCX: 1ffff920003dbf16 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000000 RBP: ffffc90001edfaf0 R08: ffffffff843751a2 R09: ffffffff84375154 R10: 0000000000000002 R11: ffff8881127ba780 R12: fffff520003dbe94 R13: 1ffff11022aaf14a R14: ffff888115578a52 R15: 00007ffd1b8791e0 tcp_getsockopt+0x294/0x2ab0 net/ipv4/tcp.c:3898 sock_common_getsockopt+0x99/0xb0 net/core/sock.c:3246 __sys_getsockopt+0x27e/0x480 net/socket.c:2163 __do_sys_getsockopt net/socket.c:2178 [inline] __se_sys_getsockopt net/socket.c:2175 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2175 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fe4e8f5b10a Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd1b8791b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00007fe4e8f5b10a RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 00007ffd1b8791e0 R08: 00007ffd1b8791dc R09: ffffffffffff0000 R10: 00007ffd1b8791e0 R11: 0000000000000246 R12: 0000000000000032 R13: 0000000000000003 R14: 00007ffd1b8791dc R15: 00007fe4e903ab60 Modules linked in: ---[ end trace d701d78404b8f286 ]--- RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 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 3c 5d 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc900001609d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff888156bd2000 RCX: 7a011a94de612f00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000160a18 R08: ffffffff81545288 R09: ffffed103ee295d8 R10: ffffed103ee295d8 R11: 0000000000000000 R12: ffff8881173de450 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00005555562b4400(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd1b877fd8 CR3: 0000000153199000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 4c 89 f7 mov %r14,%rdi 3: e8 11 4f 6f fd callq 0xfd6f4f19 8: e9 65 d6 ff ff jmpq 0xffffd672 d: 44 89 e9 mov %r13d,%ecx 10: 80 e1 07 and $0x7,%cl 13: fe c1 inc %cl 15: 38 c1 cmp %al,%cl 17: 0f 8c d0 d6 ff ff jl 0xffffd6ed 1d: 4c 89 ef mov %r13,%rdi 20: e8 14 4f 6f fd callq 0xfd6f4f39 25: e9 c3 d6 ff ff jmpq 0xffffd6ed * 2a: 48 8d 8c 24 70 04 00 lea 0x470(%rsp),%rcx <-- trapping instruction 31: 00 32: 80 e1 07 and $0x7,%cl 35: 80 c1 03 add $0x3,%cl 38: 38 c1 cmp %al,%cl 3a: 0f 8c 5b d7 ff ff jl 0xffffd79b