Created attachment 280667 [details]
dmesg with stack traces

Running a btrfs receive using btrfs-progs v4.19.1 on linux kernel 4.19.16 seems to have deadlocked the btrfs receive process. Full command is /usr/local/bin/btrfs receive /mirror/, and it's and ssh invocation of a send with just the subvolume being sent i.e. no other options. The filesystem itself doesn't seem to be hung, i.e. can still ls and read files on it, just the receive and a handful of kernel threads are hung. The /proc/stack for the btrfs receive is:

[<0>] btrfs_async_run_delayed_refs+0x115/0x140 [btrfs]
[<0>] __btrfs_end_transaction+0x1d1/0x2d0 [btrfs]
[<0>] btrfs_setattr+0x4ea/0x590 [btrfs]
[<0>] notify_change+0x2f4/0x430
[<0>] do_truncate+0x5e/0x90
[<0>] vfs_truncate+0x195/0x1d0
[<0>] do_sys_truncate+0x59/0xa0
[<0>] do_syscall_64+0x55/0x100
[<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9