------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278, CPU#1: syz.1.5550/18155
Modules linked in:
CPU: 1 UID: 0 PID: 18155 Comm: syz.1.5550 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278
Code: 83 c4 f8 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 07 84 c0 0f 85 ee 01 00 00 44 89 65 00 49 83 c5 08 eb 13 e8 57 cd 1e 00 90 <0f> 0b 90 eb 05 e8 4c cd 1e 00 45 31 ed 4c 89 e8 48 83 c4 28 5b 41
RSP: 0018:ffffc90003b2e780 EFLAGS: 00010293
RAX: ffffffff81a1ac59 RBX: 00003fffffffffff RCX: ffff88805a531e40
RDX: 0000000000000000 RSI: 00003fffffffffff RDI: 0000000000000000
RBP: 0000000000000012 R08: 0000000000000e3d R09: 000000862c89aa99
R10: 000000862c89aa99 R11: 000046ebc200004d R12: 0000000000000012
R13: 0000000000000000 R14: ffffc90003b2e8c8 R15: 1ffffffff1c0aa96
FS:  00007fcf1288e6c0(0000) GS:ffff888125ddc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 000000007db04000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 copy_data kernel/printk/printk_ringbuffer.c:1857 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1966 [inline]
 _prb_read_valid+0x672/0xa90 kernel/printk/printk_ringbuffer.c:2143
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2215
 printk_get_next_message+0x15c/0x7b0 kernel/printk/printk.c:2978
 console_emit_next_record kernel/printk/printk.c:3065 [inline]
 console_flush_one_record kernel/printk/printk.c:3197 [inline]
 console_flush_all+0x4cc/0xb10 kernel/printk/printk.c:3271
 __console_flush_and_unlock kernel/printk/printk.c:3301 [inline]
 console_unlock+0xbb/0x190 kernel/printk/printk.c:3341
 vprintk_emit+0x4c5/0x590 kernel/printk/printk.c:2423
 _printk+0xcf/0x120 kernel/printk/printk.c:2448
 __ip6_tnl_rcv+0xfcf/0x1410 net/ipv6/ip6_tunnel.c:863
 ip6_tnl_rcv+0x7c/0xa0 net/ipv6/ip6_tunnel.c:903
 ip6erspan_rcv net/ipv6/ip6_gre.c:-1 [inline]
 gre_rcv+0xbb1/0x11e0 net/ipv6/ip6_gre.c:583
 ip6_protocol_deliver_rcu+0xe0b/0x15c0 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:489
 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318
 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
 ip6_mc_input+0x655/0xb70 net/ipv6/ip6_input.c:590
 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318
 __netif_receive_skb_one_core net/core/dev.c:6126 [inline]
 __netif_receive_skb+0xd3/0x380 net/core/dev.c:6239
 netif_receive_skb_internal net/core/dev.c:6325 [inline]
 netif_receive_skb+0x1cb/0x790 net/core/dev.c:6384
 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485
 tun_get_user+0x2b65/0x3e90 drivers/net/tun.c:1953
 tun_chr_write_iter+0x113/0x210 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf1198efc9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf1288e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcf11be5fa0 RCX: 00007fcf1198efc9
RDX: 000000000000fdef RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007fcf11a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf11be6038 R14: 00007fcf11be5fa0 R15: 00007fffef892d78
 </TASK>