skbuff: skb_under_panic: text:ffffffff8a2775a8 len:112 put:40 head:ffff888054d6a080 data:ffff888054d6a068 tail:0x58 end:0x180 dev:team0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:213!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 1330 Comm: kworker/u8:9 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound flush_to_ldisc
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213
Code: c7 20 90 6f 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 6e 67 f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a084a0 EFLAGS: 00010286
RAX: 0000000000000087 RBX: dffffc0000000000 RCX: c889edb7238df700
RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90000a081a7 R09: 1ffff92000141034
R10: dffffc0000000000 R11: fffff52000141035 R12: ffff88807d458b50
R13: ffff888054d6a080 R14: ffff888054d6a068 R15: 0000000000000058
FS: 0000000000000000(0000) GS:ffff888125f3a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000576b099c CR3: 000000005daa8000 CR4: 00000000003526f0
DR0: 0000000000000400 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
skb_under_panic net/core/skbuff.c:223 [inline]
skb_push+0xc3/0xe0 net/core/skbuff.c:2641
ip6gre_header+0xc8/0x790 net/ipv6/ip6_gre.c:1371
dev_hard_header include/linux/netdevice.h:3436 [inline]
neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618
neigh_output include/net/neighbour.h:556 [inline]
ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
NF_HOOK include/linux/netfilter.h:318 [inline]
ndisc_send_skb+0xbce/0x1510 net/ipv6/ndisc.c:512
addrconf_rs_timer+0x369/0x6a0 net/ipv6/addrconf.c:4037
call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404
handle_softirqs+0x27d/0x850 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 f4 e9 df 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900044df5c0 EFLAGS: 00000206
RAX: c889edb7238df700 RBX: 0000000000000000 RCX: c889edb7238df700
RDX: 000000001ec61200 RSI: ffffffff8d976eb6 RDI: ffffffff8bc07b60
RBP: ffffffff850f6531 R08: ffffffff850f6531 R09: ffffc9000ccd5380
R10: ffffc900044df760 R11: fffff5200089bef1 R12: 0000000000000000
R13: ffffc9000ccd5380 R14: 0000000000000001 R15: 0000000000000246
__mutex_lock_common kernel/locking/mutex.c:614 [inline]
__mutex_lock+0x187/0x1350 kernel/locking/mutex.c:776
class_mutex_constructor include/linux/mutex.h:253 [inline]
flush_echoes drivers/tty/n_tty.c:783 [inline]
__receive_buf drivers/tty/n_tty.c:1618 [inline]
n_tty_receive_buf_common+0xbc1/0x1300 drivers/tty/n_tty.c:1715
tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:37
receive_buf drivers/tty/tty_buffer.c:445 [inline]
flush_to_ldisc+0x24a/0x6e0 drivers/tty/tty_buffer.c:495
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213
Code: c7 20 90 6f 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 6e 67 f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a084a0 EFLAGS: 00010286
RAX: 0000000000000087 RBX: dffffc0000000000 RCX: c889edb7238df700
RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90000a081a7 R09: 1ffff92000141034
R10: dffffc0000000000 R11: fffff52000141035 R12: ffff88807d458b50
R13: ffff888054d6a080 R14: ffff888054d6a068 R15: 0000000000000058
FS: 0000000000000000(0000) GS:ffff888125f3a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000576b099c CR3: 000000000dd3a000 CR4: 00000000003526f0
DR0: 0000000000000400 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: 9c pushf
5: 8f 44 24 30 pop 0x30(%rsp)
9: f7 44 24 30 00 02 00 testl $0x200,0x30(%rsp)
10: 00
11: 0f 85 cd 00 00 00 jne 0xe4
17: f7 44 24 08 00 02 00 testl $0x200,0x8(%rsp)
1e: 00
1f: 74 01 je 0x22
21: fb sti
22: 65 48 8b 05 f4 e9 df mov %gs:0x10dfe9f4(%rip),%rax # 0x10dfea1e
29: 10
* 2a: 48 3b 44 24 58 cmp 0x58(%rsp),%rax <-- trapping instruction
2f: 0f 85 e5 00 00 00 jne 0x11a
35: 48 83 c4 60 add $0x60,%rsp
39: 5b pop %rbx
3a: 41 5c pop %r12
3c: 41 5d pop %r13
3e: 41 5e pop %r14