------------[ cut here ]------------
!iov_iter_count(&con->v2.in_iter)
WARNING: net/ceph/messenger_v2.c:3129 at populate_in_iter net/ceph/messenger_v2.c:3129 [inline], CPU#0: kworker/0:5/5704
WARNING: net/ceph/messenger_v2.c:3129 at ceph_con_v2_try_read+0x6634/0x6810 net/ceph/messenger_v2.c:3159, CPU#0: kworker/0:5/5704
Modules linked in:
CPU: 0 UID: 0 PID: 5704 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: ceph-msgr ceph_con_workfn
RIP: 0010:populate_in_iter net/ceph/messenger_v2.c:3129 [inline]
RIP: 0010:ceph_con_v2_try_read+0x6634/0x6810 net/ceph/messenger_v2.c:3159
Code: 8d 3d 60 8d cd 04 43 0f b6 04 3e 84 c0 48 8b 54 24 38 0f 85 85 00 00 00 8b 32 67 48 0f b9 3a e9 40 ff ff ff e8 cd f7 b0 f6 90 <0f> 0b 90 41 bd c3 ff ff ff e9 32 ff ff ff e8 b9 f7 b0 f6 90 0f 0b
RSP: 0018:ffffc9000602f500 EFLAGS: 00010293
RAX: ffffffff8b14abe3 RBX: 0000000000000000 RCX: ffff88805d5f5dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000602fad8 R08: 0000000000000000 R09: 0000000000000000
R10: ffff888035c40703 R11: ffffed1006b880e2 R12: fffff52000c05ef0
R13: 0000000000000000 R14: 0000000000000010 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881259f2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3dac3c0ff8 CR3: 000000005bed4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ceph_con_workfn+0x1f5/0x14a0 net/ceph/messenger.c:1575
 process_one_work+0xaaf/0x1480 kernel/workqueue.c:3379
 process_scheduled_works kernel/workqueue.c:3462 [inline]
 worker_thread+0xb05/0x10d0 kernel/workqueue.c:3543
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>