skbuff: skb_over_panic: text:ffffffff87b3fbaf len:40 put:40 head:ffff88806b03b800 data:ffff88806b03b8b0 tail:0xd8 end:0xc0 dev:ip6gretap0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 23976 Comm: syz-executor.3 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:109 Code: f8 4c 8b 4c 24 10 8b 4b 70 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 e0 bd 43 8a ff 74 24 10 ff 74 24 20 e8 62 d4 c4 ff <0f> 0b e8 f9 1b 7e f8 4c 8b 64 24 18 e8 ff d2 c0 f8 48 c7 c1 20 ca RSP: 0018:ffffc90000db0968 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff8880126dfa00 RCX: 0000000000000000 RDX: ffff888079409bc0 RSI: ffffffff815b6b65 RDI: fffff520001b611f RBP: ffffffff8a43ca60 R08: 0000000000000089 R09: 0000000000000000 R10: ffffffff815afd3e R11: 0000000000000000 R12: ffffffff87b3fbaf R13: 0000000000000028 R14: ffff8880584de000 R15: 00000000000000c0 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052e8cc CR3: 000000006f2d8000 CR4: 00000000001506e0 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.cold+0x24/0x24 net/core/skbuff.c:1876 ip6_mc_hdr.constprop.0+0x11f/0x5c0 net/ipv6/mcast.c:1573 mld_newpack+0x3d8/0x770 net/ipv6/mcast.c:1624 add_grhead+0x265/0x330 net/ipv6/mcast.c:1710 add_grec+0xe2c/0x1090 net/ipv6/mcast.c:1841 mld_send_cr net/ipv6/mcast.c:1967 [inline] mld_ifc_timer_expire+0x596/0xf10 net/ipv6/mcast.c:2474 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 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+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:PageTail include/linux/page-flags.h:193 [inline] RIP: 0010:PageCompound include/linux/page-flags.h:198 [inline] RIP: 0010:PageHuge+0xf6/0x170 mm/hugetlb.c:1551 Code: 0f 94 c4 e8 6c 20 c2 ff 44 89 e0 5b 5d 41 5c c3 e8 5f 20 c2 ff 48 8d 6b 08 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 41 4c 8b 63 08 31 ff 41 83 e4 01 44 89 e6 e8 b2 27 RSP: 0018:ffffc90001f67728 EFLAGS: 00000a02 RAX: dffffc0000000000 RBX: ffffea00013bf240 RCX: 0000000000000000 RDX: 1ffffd4000277e49 RSI: ffffffff81b0a9b1 RDI: 0000000000000003 RBP: ffffea00013bf248 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81b0a917 R11: 0000000000000000 R12: ffffea00013bf248 R13: 0000000000000000 R14: 0000000000000000 R15: dead000000000100 page_remove_file_rmap mm/rmap.c:1247 [inline] page_remove_rmap+0x594/0x1360 mm/rmap.c:1337 zap_pte_range mm/memory.c:1264 [inline] zap_pmd_range mm/memory.c:1368 [inline] zap_pud_range mm/memory.c:1397 [inline] zap_p4d_range mm/memory.c:1418 [inline] unmap_page_range+0xe30/0x2640 mm/memory.c:1439 unmap_single_vma+0x198/0x300 mm/memory.c:1484 unmap_vmas+0x168/0x2e0 mm/memory.c:1516 exit_mmap+0x2b1/0x5a0 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1083 mmput+0x53/0x60 kernel/fork.c:1104 exit_mm kernel/exit.c:501 [inline] do_exit+0xb6a/0x2ae0 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x427/0x20f0 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: Unable to access opcode bytes at RIP 0x45e1ef. RSP: 002b:00007fd176048c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 0000000000000068 RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff3e936d5f R14: 00007fd1760499c0 R15: 000000000119bf8c Modules linked in: ---[ end trace 6800e8fefaa6a7ac ]--- RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:109 Code: f8 4c 8b 4c 24 10 8b 4b 70 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 e0 bd 43 8a ff 74 24 10 ff 74 24 20 e8 62 d4 c4 ff <0f> 0b e8 f9 1b 7e f8 4c 8b 64 24 18 e8 ff d2 c0 f8 48 c7 c1 20 ca RSP: 0018:ffffc90000db0968 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff8880126dfa00 RCX: 0000000000000000 RDX: ffff888079409bc0 RSI: ffffffff815b6b65 RDI: fffff520001b611f RBP: ffffffff8a43ca60 R08: 0000000000000089 R09: 0000000000000000 R10: ffffffff815afd3e R11: 0000000000000000 R12: ffffffff87b3fbaf R13: 0000000000000028 R14: ffff8880584de000 R15: 00000000000000c0 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052e8cc CR3: 000000006f2d8000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400