------------[ cut here ]------------
1
WARNING: net/bridge/netfilter/nf_conntrack_bridge.c:356 at nf_ct_bridge_refrag net/bridge/netfilter/nf_conntrack_bridge.c:356 [inline], CPU#1: syz.0.41/6132
WARNING: net/bridge/netfilter/nf_conntrack_bridge.c:356 at nf_ct_bridge_post+0x43c/0x10e0 net/bridge/netfilter/nf_conntrack_bridge.c:407, CPU#1: syz.0.41/6132
Modules linked in:
CPU: 1 UID: 0 PID: 6132 Comm: syz.0.41 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:nf_ct_bridge_refrag net/bridge/netfilter/nf_conntrack_bridge.c:356 [inline]
RIP: 0010:nf_ct_bridge_post+0x43c/0x10e0 net/bridge/netfilter/nf_conntrack_bridge.c:407
Code: 49 8b 36 4c 89 ff 48 8b 54 24 08 48 8d 8c 24 40 01 00 00 49 c7 c0 70 07 85 8a e8 8f 26 e1 ff e9 79 09 00 00 e8 45 bb 40 f7 90 <0f> 0b 90 45 31 ff e9 6e 09 00 00 e8 34 bb 40 f7 eb 05 e8 2d bb 40
RSP: 0018:ffffc90003126ba0 EFLAGS: 00010293
RAX: ffffffff8a84f32b RBX: 1ffff92000624d88 RCX: ffff8880280a3d00
RDX: 0000000000000000 RSI: ffffffff8fd2fec0 RDI: 0000000000000081
RBP: ffffc90003126d80 R08: ffff8880280a3d00 R09: 0000000000000002
R10: 000000000000dd86 R11: 0000000000000000 R12: ffff888025993998
R13: dffffc0000000000 R14: ffffc90003126e40 R15: 0000000000000081
FS:  00007fce7a2fc6c0(0000) GS:ffff88812555a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fce792720c0 CR3: 0000000074c66000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
 nf_hook include/linux/netfilter.h:273 [inline]
 NF_HOOK+0x23e/0x3f0 include/linux/netfilter.h:316
 br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
 NF_HOOK+0x360/0x3f0 include/linux/netfilter.h:318
 __br_forward+0x397/0x540 net/bridge/br_forward.c:115
 deliver_clone net/bridge/br_forward.c:131 [inline]
 maybe_deliver net/bridge/br_forward.c:191 [inline]
 br_flood+0x6ee/0xb80 net/bridge/br_forward.c:238
 br_handle_frame_finish+0x14c2/0x1bb0 net/bridge/br_input.c:229
 nf_hook_bridge_pre net/bridge/br_input.c:313 [inline]
 br_handle_frame+0x80f/0x1510 net/bridge/br_input.c:442
 __netif_receive_skb_core+0x98f/0x31a0 net/core/dev.c:6063
 __netif_receive_skb_one_core net/core/dev.c:6174 [inline]
 __netif_receive_skb net/core/dev.c:6289 [inline]
 netif_receive_skb_internal net/core/dev.c:6375 [inline]
 netif_receive_skb+0x1fe/0xc50 net/core/dev.c:6434
 tun_rx_batched+0x1de/0x790 drivers/net/tun.c:1485
 tun_get_user+0x2a78/0x3dd0 drivers/net/tun.c:1953
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce7935cfce
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fce7a2fbfb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fce7a2fc6c0 RCX: 00007fce7935cfce
RDX: 000000000000004e RSI: 0000200000000500 RDI: 00000000000000c8
RBP: 00007fce79432c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fce79616128 R14: 00007fce79616090 R15: 00007fffea010c68
 </TASK>