------------[ cut here ]------------
a->in_addr.ss_family == 512
WARNING: ./include/linux/ceph/decode.h:238 at ceph_decode_banner_addr include/linux/ceph/decode.h:238 [inline], CPU#0: kworker/0:5/5696
WARNING: ./include/linux/ceph/decode.h:238 at read_partial_banner net/ceph/messenger_v1.c:632 [inline], CPU#0: kworker/0:5/5696
WARNING: ./include/linux/ceph/decode.h:238 at ceph_con_v1_try_read+0x54e2/0x6ca0 net/ceph/messenger_v1.c:1339, CPU#0: kworker/0:5/5696
Modules linked in:
CPU: 0 UID: 0 PID: 5696 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: ceph-msgr ceph_con_workfn
RIP: 0010:ceph_decode_banner_addr include/linux/ceph/decode.h:238 [inline]
RIP: 0010:read_partial_banner net/ceph/messenger_v1.c:632 [inline]
RIP: 0010:ceph_con_v1_try_read+0x54e2/0x6ca0 net/ceph/messenger_v1.c:1339
Code: 3c 02 00 0f 85 9c 03 00 00 48 c7 c0 40 8f 68 8d e9 c8 c7 ff ff 48 8b 7c 24 10 e8 e9 c5 f9 f6 e9 e0 af ff ff e8 0f 37 89 f6 90 <0f> 0b 90 e9 06 ee ff ff e8 01 37 89 f6 31 f6 bf 00 0c 00 00 e8 f5
RSP: 0018:ffffc90004857a08 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88801f7cc73c RCX: ffffffff8b812a75
RDX: ffff888031f74a80 RSI: ffffffff8b813c71 RDI: ffff888031f74a80
RBP: ffff88801f7cc75a R08: 0000000000000003 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88801f7cc418
R13: 0000000000000002 R14: 0000000000000091 R15: ffffed1003ef9887
FS:  0000000000000000(0000) GS:ffff888123bde000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f419abeb7c0 CR3: 000000007543b000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ceph_con_workfn+0x9a5/0x13e0 net/ceph/messenger.c:1577
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>