[BUG] WARNING in ceph_fill_trace

[Farhad Alemi]

Hello,

As part of the kernel research at ASU's SEFCOM
lab, we hit the crash below. Crash reports can be found here:

  https://github.com/farhad-alemi/public_bug_reports/tree/main/171-warning-in-ceph-fill-trace/

  WARNING: fs/ceph/inode.c:1632 at ceph_fill_trace+0x493/0x3a80
fs/ceph/inode.c:1632, CPU#1: kworker/1:5/11236
  Workqueue: ceph-msgr ceph_con_workfn
  RIP: 0010:ceph_fill_trace+0x493/0x3a80 fs/ceph/inode.c:1632
  Call Trace:
   ceph_fill_trace+0x493/0x3a80 fs/ceph/inode.c:1632
   handle_reply fs/ceph/mds_client.c:4050 [inline]
   mds_dispatch+0x4753/0x77d0 fs/ceph/mds_client.c:6384
   ceph_con_process_message+0x14f/0x530 net/ceph/messenger.c:1425
   ceph_con_v1_try_read+0x2f40/0x6f20 net/ceph/messenger_v1.c:1430
   ceph_con_workfn+0x1f5/0x1440 net/ceph/messenger.c:1577
   process_scheduled_works+0x881/0x1170 kernel/workqueue.c:3397
   worker_thread+0x988/0xde0 kernel/workqueue.c:3478

Our reproducer.c is available upon request.

Happy to test a patch if that would help.

Regards,