skbuff: skb_over_panic: text:ffffffff83b5095f len:76 put:20 head:ffff8881b5d8c800 data:ffff8881b5d8c840 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: 320 Comm: syz-executor.1 Not tainted 5.4.210-syzkaller-00019-g035e4939365c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 RIP: 0010:skb_panic+0x14a/0x150 net/core/skbuff.c:105 Code: f2 0e 85 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 cf ea c6 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:ffff8881f6f09b28 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff8881bf68c000 RCX: 4a80a8906c9faf00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffff8881b5d8c800 R08: ffffffff814abe7a R09: ffffed103edeaa08 R10: ffffed103edeaa08 R11: 1ffff1103edeaa07 R12: 000000000000008c R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881b5d8c840 FS: 0000555556df4400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5dcbe323be CR3: 00000001c0b95000 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+0x783/0xc50 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:arch_stack_walk+0x1/0x140 arch/x86/kernel/stacktrace.c:17 Code: 84 00 00 00 00 00 0f 1f 00 be 01 00 00 00 48 c7 c7 80 c9 a8 85 e8 1f f4 64 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 68 49 89 cf 49 89 d4 RSP: 0018:ffff8881c04478a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11038088f00 RBX: 1ffff11038088f19 RCX: 0000000000000000 RDX: ffff8881f5e4af40 RSI: ffff8881c04478b8 RDI: ffffffff8150c140 RBP: 0000000000000001 R08: dffffc0000000000 R09: ffff8881c0447930 R10: 0000000000000006 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8881c0447930 R14: ffff8881c04478c8 R15: 0000000000000040 stack_trace_save+0xce/0x170 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd0/0x210 mm/slub.c:2842 vm_area_dup kernel/fork.c:358 [inline] dup_mmap+0x46c/0xb60 kernel/fork.c:545 dup_mm+0x8c/0x300 kernel/fork.c:1368 copy_mm+0xe8/0x180 kernel/fork.c:1424 copy_process+0x125e/0x31f0 kernel/fork.c:2041 _do_fork+0x142/0x7f0 kernel/fork.c:2391 __do_sys_clone kernel/fork.c:2549 [inline] __se_sys_clone kernel/fork.c:2530 [inline] __x64_sys_clone+0x213/0x260 kernel/fork.c:2530 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f5dcb1e62ab Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00 RSP: 002b:00007fffd69631f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5dcb1e62ab RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000555556df4400 R10: 0000555556df46d0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fffd69632d0 Modules linked in: ---[ end trace c3966db84b62d5a2 ]--- RIP: 0010:skb_panic+0x14a/0x150 net/core/skbuff.c:105 Code: f2 0e 85 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 cf ea c6 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:ffff8881f6f09b28 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff8881bf68c000 RCX: 4a80a8906c9faf00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffff8881b5d8c800 R08: ffffffff814abe7a R09: ffffed103edeaa08 R10: ffffed103edeaa08 R11: 1ffff1103edeaa07 R12: 000000000000008c R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881b5d8c840 FS: 0000555556df4400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5dcbe323be CR3: 00000001c0b95000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 84 00 test %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 0f 1f 00 nopl (%rax) 9: be 01 00 00 00 mov $0x1,%esi e: 48 c7 c7 80 c9 a8 85 mov $0xffffffff85a8c980,%rdi 15: e8 1f f4 64 00 callq 0x64f439 1a: c3 retq 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop 29: 55 push %rbp * 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction 2d: 41 57 push %r15 2f: 41 56 push %r14 31: 41 55 push %r13 33: 41 54 push %r12 35: 53 push %rbx 36: 48 83 ec 68 sub $0x68,%rsp 3a: 49 89 cf mov %rcx,%r15 3d: 49 89 d4 mov %rdx,%r12