skbuff: skb_over_panic: text:ffffffff843c4b63 len:56 put:8 head:ffff88810d87bc00 data:ffff88810d87bc50 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: 25220 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 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:ffffc900000079d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff8881404aa000 RCX: afca29822154c800 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000007a18 R08: ffffffff81544d58 R09: ffffed103ee0a5d8 R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff88810d87bc50 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000555557074400(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cf20000 CR3: 0000000119b7c000 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:common_nsleep+0x4e/0xb0 kernel/time/posix-timers.c:1225 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 d5 4a 47 00 4c 8b 2b 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 b8 4a 47 00 4d 69 e5 00 ca 9a 3b 4c 03 23 48 bb RSP: 0018:ffffc900058bfe08 EFLAGS: 00000246 RAX: 1ffff92000b17fd1 RBX: ffffc900058bfe88 RCX: ffff888151cb3b40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900058bfe30 R08: ffffffff815f7fcc R09: fffff52000b17fba R10: fffff52000b17fba R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline] __se_sys_clock_nanosleep+0x308/0x390 kernel/time/posix-timers.c:1245 __x64_sys_clock_nanosleep+0x9b/0xb0 kernel/time/posix-timers.c:1245 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fa7042cbd1a Code: 83 ff 03 74 3b 48 83 ec 28 b8 fa ff ff ff 83 ff 02 49 89 ca 0f 44 f8 64 8b 04 25 18 00 00 00 85 c0 75 2d b8 e6 00 00 00 0f 05 <89> c2 f7 da 3d 00 f0 ff ff b8 00 00 00 00 0f 47 c2 48 83 c4 28 c3 RSP: 002b:00007fff5fd27830 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 0000000000000f39 RCX: 00007fa7042cbd1a RDX: 00007fff5fd27870 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fff5fd278fc R08: 00007fff5fd6b080 R09: 00007fff5fd6b0b8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032 R13: 000000000012a0ca R14: 0000000000000009 R15: 00007fff5fd27960 Modules linked in: ---[ end trace 39c164c3a6238383 ]--- 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:ffffc900000079d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff8881404aa000 RCX: afca29822154c800 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000007a18 R08: ffffffff81544d58 R09: ffffed103ee0a5d8 R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff88810d87bc50 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000555557074400(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cf20000 CR3: 0000000119b7c000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 48 89 add %cl,-0x77(%rax) 3: d8 48 c1 fmuls -0x3f(%rax) 6: e8 03 42 80 3c callq 0x3c80420e b: 20 00 and %al,(%rax) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 d5 4a 47 00 callq 0x474aec 17: 4c 8b 2b mov (%rbx),%r13 1a: 48 83 c3 08 add $0x8,%rbx 1e: 48 89 d8 mov %rbx,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) * 2a: 74 08 je 0x34 <-- trapping instruction 2c: 48 89 df mov %rbx,%rdi 2f: e8 b8 4a 47 00 callq 0x474aec 34: 4d 69 e5 00 ca 9a 3b imul $0x3b9aca00,%r13,%r12 3b: 4c 03 23 add (%rbx),%r12 3e: 48 rex.W 3f: bb .byte 0xbb