Confirming on Ubuntu 26.04, bluez 5.85-4ubuntu0.4, without any incoming
file push. `mpris-proxy` crash-looped about every 15 s, always at the
same instruction (NULL `player->obex` in `find_player_by_obex()`,
`mpris-proxy + 0x9682`). The trigger is any `org.bluez.obex.Transfer1`
`Status` change, so no file push or cover art is needed. Tested against
the 5.85 source with the patch from bluez PR #2631 (applies with
offsets, builds without warnings): stock binary segfaults within
seconds, patched build ran 60 s with no crash. Hardware-free reproducer:
bluez issue #2569.

Happy to test an SRU build.

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https://bugs.launchpad.net/bugs/2172906

Title:
  mpris-proxy segfault (NULL deref in find_player_by_obex) triggers
  apport crash dialog during Bluetooth OBEX file transfer on 26.04

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