skbuff: skb_over_panic: text:ffffffff843627c3 len:56 put:8 head:ffff8881135cd800 data:ffff8881135cd850 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: 24962 Comm: syz-executor.2 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 ac c1 8e 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: ffff888110ada000 RCX: a0084aca1aa85d00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000007a18 R08: ffffffff81544c88 R09: ffffed103ee0a5d8 R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff8881135cd850 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007f1c64506700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3b5c45d090 CR3: 000000010dbbf000 CR4: 00000000003506b0 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:security_file_permission+0x40/0xc0 security/security.c:1422 Code: 47 ff 48 8b 1d d1 95 af 03 48 85 db 74 66 49 bd 00 00 00 00 00 fc ff df 66 90 4c 8d 63 18 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 e7 e8 46 98 81 ff 4c 89 ff 44 89 f6 41 ff 14 24 41 89 RSP: 0018:ffffc9000741f6b8 EFLAGS: 00000246 RAX: 1ffffffff0ba9ea2 RBX: ffffffff85d4f4f8 RCX: 0000000000040000 RDX: ffffc90000cf9000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9000741f6e0 R08: ffffffff81ae37ac R09: ffffffff81bbd62e R10: 0000000000000002 R11: ffff88810e1b0000 R12: ffffffff85d4f510 R13: dffffc0000000000 R14: 0000000000000002 R15: ffff888119218c00 rw_verify_area+0x1d1/0x370 fs/read_write.c:400 do_iter_write+0xed/0x660 fs/read_write.c:861 vfs_iter_write+0x7c/0xa0 fs/read_write.c:907 iter_file_splice_write+0x7fb/0xf70 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0xfe/0x130 fs/splice.c:933 splice_direct_to_actor+0x4f4/0xbc0 fs/splice.c:888 do_splice_direct+0x28b/0x3e0 fs/splice.c:976 do_sendfile+0x914/0x1390 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0x163/0x220 fs/read_write.c:1304 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f1c65390049 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:00007f1c64506168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f1c654a2f60 RCX: 00007f1c65390049 RDX: 0000000020000080 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 00007f1c653ea08d R08: 0000000000000000 R09: 0000000000000000 R10: 000000001000ffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe75260baf R14: 00007f1c64506300 R15: 0000000000022000 Modules linked in: ---[ end trace f1ef4e58f2b02017 ]--- 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 ac c1 8e 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: ffff888110ada000 RCX: a0084aca1aa85d00 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000007a18 R08: ffffffff81544c88 R09: ffffed103ee0a5d8 R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff8881135cd850 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007f1c64506700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3b5c45d090 CR3: 000000010dbbf000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 47 ff 48 8b rex.RXB decl -0x75(%r8) 4: 1d d1 95 af 03 sbb $0x3af95d1,%eax 9: 48 85 db test %rbx,%rbx c: 74 66 je 0x74 e: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 15: fc ff df 18: 66 90 xchg %ax,%ax 1a: 4c 8d 63 18 lea 0x18(%rbx),%r12 1e: 4c 89 e0 mov %r12,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) * 2a: 74 08 je 0x34 <-- trapping instruction 2c: 4c 89 e7 mov %r12,%rdi 2f: e8 46 98 81 ff callq 0xff81987a 34: 4c 89 ff mov %r15,%rdi 37: 44 89 f6 mov %r14d,%esi 3a: 41 ff 14 24 callq *(%r12) 3e: 41 rex.B 3f: 89 .byte 0x89