skbuff: skb_over_panic: text:ffffffff843c4b63 len:56 put:8 head:ffff888112795000 data:ffff888112795050 tail:0x88 end:0x80 dev:ip6gretap0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 160 Comm: udevd Not tainted 5.10.102-syzkaller-00171-ge1b86e7f5cbb #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 0c a0 88 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: ffff88814dad2000 RCX: 1a97e4ec470d9a00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000160a18 R08: ffffffff81544d58 R09: ffffed103ee2a5d8 R10: ffffed103ee2a5d8 R11: 0000000000000000 R12: ffff888112795050 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007f3a87fb1840(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd41610c08 CR3: 000000010ca65000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> 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 </IRQ> __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_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] RIP: 0010:__call_rcu kernel/rcu/tree.c:2996 [inline] RIP: 0010:call_rcu+0xd47/0x1500 kernel/rcu/tree.c:3037 Code: 00 74 08 4c 89 ef e8 18 8e 4d 00 48 8b 05 c1 d3 ff 04 49 03 45 00 48 39 c3 7f 71 48 8b 44 24 50 48 89 44 24 78 ff 74 24 78 9d <49> bd 00 00 00 00 00 fc ff df 48 8b 5c 24 60 48 c7 84 24 a0 00 00 RSP: 0018:ffffc90000b97b00 EFLAGS: 00000246 RAX: 0000000000000246 RBX: 0000000000000370 RCX: 1ffff1103ee2ae39 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881f71571c8 RBP: ffffc90000b97cb8 R08: dffffc0000000000 R09: ffffed103ee2ae3a R10: ffffed103ee2ae3a R11: 0000000000000000 R12: ffff8881f7157100 R13: ffff8881f71571d8 R14: 1ffff1103ee2ae3b R15: ffff8881f71571c8 dentry_free+0xbc/0x150 fs/dcache.c:350 __dentry_kill+0x494/0x5c0 fs/dcache.c:593 dentry_kill fs/dcache.c:692 [inline] dput+0x303/0x600 fs/dcache.c:878 do_unlinkat+0x465/0x960 fs/namei.c:3974 __do_sys_unlink fs/namei.c:4018 [inline] __se_sys_unlink fs/namei.c:4016 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4016 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f3a8810a2d7 Code: f0 ff ff 73 01 c3 48 8b 0d 9e db 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 71 db 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007fff93cc2378 EFLAGS: 00000202 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3a8810a2d7 RDX: 0000000000000000 RSI: 000000008a57a640 RDI: 00005592b69340d8 RBP: 0000000000000000 R08: 000000008a5aee59 R09: 00007fff93cf90b8 R10: 000000000006dd4a R11: 0000000000000202 R12: 0000000000000bb8 R13: 00005592b6e70260 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace e5155b99316c5017 ]--- 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 0c a0 88 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: ffff88814dad2000 RCX: 1a97e4ec470d9a00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000160a18 R08: ffffffff81544d58 R09: ffffed103ee2a5d8 R10: ffffed103ee2a5d8 R11: 0000000000000000 R12: ffff888112795050 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007f3a87fb1840(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd41610c08 CR3: 000000010ca65000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 74 08 4c add %dh,0x4c(%rax,%rcx,1) 4: 89 ef mov %ebp,%edi 6: e8 18 8e 4d 00 callq 0x4d8e23 b: 48 8b 05 c1 d3 ff 04 mov 0x4ffd3c1(%rip),%rax # 0x4ffd3d3 12: 49 03 45 00 add 0x0(%r13),%rax 16: 48 39 c3 cmp %rax,%rbx 19: 7f 71 jg 0x8c 1b: 48 8b 44 24 50 mov 0x50(%rsp),%rax 20: 48 89 44 24 78 mov %rax,0x78(%rsp) 25: ff 74 24 78 pushq 0x78(%rsp) 29: 9d popfq * 2a: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 <-- trapping instruction 31: fc ff df 34: 48 8b 5c 24 60 mov 0x60(%rsp),%rbx 39: 48 rex.W 3a: c7 .byte 0xc7 3b: 84 24 a0 test %ah,(%rax,%riz,4)