skbuff: skb_over_panic: text:ffffffff843b8b93 len:56 put:8 head:ffff888160c8d000 data:ffff888160c8d050 tail:0x88 end:0x80 dev:ip6gretap1 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.10.77-syzkaller-01258-g76698ea35fd3 #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 8c 4d 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:ffffc900000079d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff88816004c000 RCX: 2445b416163acb00 RDX: 0000000000000503 RSI: 0000000000000503 RDI: 0000000000000000 RBP: ffffc90000007a18 R08: ffffffff81545288 R09: ffffed103ee095d8 R10: ffffed103ee095d8 R11: 0000000000000000 R12: ffff888160c8d050 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc89cec388 CR3: 000000016e86f000 CR4: 00000000003526b0 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:native_irq_disable arch/x86/include/asm/irqflags.h:49 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:114 [inline] RIP: 0010:acpi_idle_do_entry+0xbb/0x1f0 drivers/acpi/processor_idle.c:558 Code: 89 de 48 83 e6 08 31 ff e8 d2 53 cf fc 48 83 e3 08 0f 85 ae 00 00 00 e9 0c 00 00 00 e8 fe 4e cf fc 0f 00 2d b7 02 b4 00 fb f4 e9 a1 00 00 00 49 83 c6 04 4c 89 f0 48 c1 e8 03 42 8a 04 38 84 RSP: 0018:ffffffff86407be8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff849da927 RDX: ffffffff8641b000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff86407c00 R08: ffffffff849da94e R09: fffffbfff0c83601 R10: fffffbfff0c83601 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888102ff3804 R14: ffff888105bc1064 R15: dffffc0000000000 acpi_idle_enter+0x32d/0x4f0 drivers/acpi/processor_idle.c:693 cpuidle_enter_state+0x5d1/0x1470 drivers/cpuidle/cpuidle.c:249 cpuidle_enter+0x5f/0xa0 drivers/cpuidle/cpuidle.c:364 call_cpuidle kernel/sched/idle.c:160 [inline] cpuidle_idle_call kernel/sched/idle.c:241 [inline] do_idle+0x420/0x5e0 kernel/sched/idle.c:302 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:398 rest_init+0xe6/0xf0 init/main.c:713 arch_call_rest_init+0xe/0x10 start_kernel+0x466/0x4d8 init/main.c:1052 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:526 x86_64_start_kernel+0x7a/0x7d arch/x86/kernel/head64.c:507 secondary_startup_64_no_verify+0xb0/0xbb Modules linked in: ---[ end trace 7b5859e1970f1870 ]--- 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 8c 4d 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:ffffc900000079d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff88816004c000 RCX: 2445b416163acb00 RDX: 0000000000000503 RSI: 0000000000000503 RDI: 0000000000000000 RBP: ffffc90000007a18 R08: ffffffff81545288 R09: ffffed103ee095d8 R10: ffffed103ee095d8 R11: 0000000000000000 R12: ffff888160c8d050 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc89cec388 CR3: 000000000640f000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 de mov %ebx,%esi 2: 48 83 e6 08 and $0x8,%rsi 6: 31 ff xor %edi,%edi 8: e8 d2 53 cf fc callq 0xfccf53df d: 48 83 e3 08 and $0x8,%rbx 11: 0f 85 ae 00 00 00 jne 0xc5 17: e9 0c 00 00 00 jmpq 0x28 1c: e8 fe 4e cf fc callq 0xfccf4f1f 21: 0f 00 2d b7 02 b4 00 verw 0xb402b7(%rip) # 0xb402df 28: fb sti 29: f4 hlt * 2a: fa cli <-- trapping instruction 2b: e9 a1 00 00 00 jmpq 0xd1 30: 49 83 c6 04 add $0x4,%r14 34: 4c 89 f0 mov %r14,%rax 37: 48 c1 e8 03 shr $0x3,%rax 3b: 42 8a 04 38 mov (%rax,%r15,1),%al 3f: 84 .byte 0x84