skbuff: skb_over_panic: text:ffffffff83b2b5c9 len:56 put:8 head:ffff8881e30cd800 data:ffff8881e30cd850 tail:0x88 end:0x80 dev:ip6gretap1 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 29330 Comm: syz-executor.3 Not tainted 5.4.197-syzkaller-00007-g19a66b6f3cd8 #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: 0018:ffff8881f6e09a90 EFLAGS: 00010286 RAX: 0000000000000088 RBX: ffff8881c3e46000 RCX: d45339ce35072a00 RDX: 0000000000000503 RSI: 0000000000000503 RDI: 0000000000000000 RBP: ffff8881e30cd800 R08: ffffffff814a983a R09: ffffed103edc1309 R10: ffffed103edc1309 R11: 1ffff1103edc1308 R12: 0000000000000088 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881e30cd850 FS: 00007fc227293700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020003000 CR3: 00000001e2513000 CR4: 00000000003406f0 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 mld_newpack+0x5b9/0x8f0 net/ipv6/mcast.c:1629 add_grhead net/ipv6/mcast.c:1710 [inline] add_grec+0xe2e/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: 0010:on_stack arch/x86/include/asm/stacktrace.h:46 [inline] RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:332 [inline] RIP: 0010:deref_stack_reg+0x70/0x170 arch/x86/kernel/unwind_orc.c:342 Code: 4c 8b 6b 08 48 8d 7b 10 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 ef e8 5d 00 48 8b 6b 10 48 89 d8 48 c1 e8 03 42 8a 04 20 <84> c0 0f 85 c8 00 00 00 83 3b 00 74 18 4d 39 fd 77 13 4c 39 fd 76 RSP: 0018:ffff8881c8eb7468 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: 1ffff110391d6e00 RBX: ffff8881c8eb7598 RCX: 0000000000000000 RDX: ffff8881c8eb75d8 RSI: ffff8881c8eb7f48 RDI: ffff8881c8eb75a8 RBP: ffff8881c8eb8000 R08: dffffc0000000000 R09: ffff8881c8eb75e8 R10: ffffed10391d6ebf R11: 1ffff110391d6ebd R12: dffffc0000000000 R13: ffff8881c8eb0000 R14: ffff8881c8eb75d8 R15: ffff8881c8eb7f48 unwind_next_frame+0x1653/0x1e00 arch/x86/kernel/unwind_orc.c:574 arch_stack_walk+0x114/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xce/0x170 kernel/stacktrace.c:123 save_stack+0x61/0x1e0 mm/page_owner.c:122 __set_page_owner+0x33/0x1f0 mm/page_owner.c:191 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x194/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x2ab/0x6f0 mm/page_alloc.c:4857 __alloc_pages include/linux/gfp.h:503 [inline] __alloc_pages_node include/linux/gfp.h:516 [inline] alloc_pages_node include/linux/gfp.h:530 [inline] shmem_alloc_page mm/shmem.c:1503 [inline] shmem_alloc_and_acct_page mm/shmem.c:1528 [inline] shmem_getpage_gfp+0xcb3/0x1f50 mm/shmem.c:1852 shmem_fault+0x248/0x6d0 mm/shmem.c:2081 __do_fault mm/memory.c:3250 [inline] do_read_fault mm/memory.c:3659 [inline] do_fault mm/memory.c:3788 [inline] handle_pte_fault mm/memory.c:4019 [inline] __handle_mm_fault mm/memory.c:4143 [inline] handle_mm_fault+0x276c/0x3b80 mm/memory.c:4180 faultin_page mm/gup.c:643 [inline] __get_user_pages+0xb1d/0x12a0 mm/gup.c:863 populate_vma_page_range mm/gup.c:1268 [inline] __mm_populate+0x31e/0x480 mm/gup.c:1316 mm_populate include/linux/mm.h:2485 [inline] vm_mmap_pgoff+0x1c2/0x1f0 mm/util.c:501 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc22811d209 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc227293168 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fc22822ff60 RCX: 00007fc22811d209 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007fc228177161 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5d03254f R14: 00007fc227293300 R15: 0000000000022000 Modules linked in: ---[ end trace fda463442a0177ac ]--- 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: 0018:ffff8881f6e09a90 EFLAGS: 00010286 RAX: 0000000000000088 RBX: ffff8881c3e46000 RCX: d45339ce35072a00 RDX: 0000000000000503 RSI: 0000000000000503 RDI: 0000000000000000 RBP: ffff8881e30cd800 R08: ffffffff814a983a R09: ffffed103edc1309 R10: ffffed103edc1309 R11: 1ffff1103edc1308 R12: 0000000000000088 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881e30cd850 FS: 00007fc227293700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020003000 CR3: 00000001e2513000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 4c 8b 6b 08 mov 0x8(%rbx),%r13 4: 48 8d 7b 10 lea 0x10(%rbx),%rdi 8: 48 89 f8 mov %rdi,%rax b: 48 c1 e8 03 shr $0x3,%rax f: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 14: 74 05 je 0x1b 16: e8 ef e8 5d 00 callq 0x5de90a 1b: 48 8b 6b 10 mov 0x10(%rbx),%rbp 1f: 48 89 d8 mov %rbx,%rax 22: 48 c1 e8 03 shr $0x3,%rax 26: 42 8a 04 20 mov (%rax,%r12,1),%al * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 0f 85 c8 00 00 00 jne 0xfa 32: 83 3b 00 cmpl $0x0,(%rbx) 35: 74 18 je 0x4f 37: 4d 39 fd cmp %r15,%r13 3a: 77 13 ja 0x4f 3c: 4c 39 fd cmp %r15,%rbp 3f: 76 .byte 0x76