[LBBS-171] io: Intermittent hangs when writing large amount of data

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This doesn't reproduce consistently but has been observed twice now in the past week, where when opening an email with large attachments using webmail, the IMAP module got locked up:

Thread 30 (Thread 0x7ffb757fa6c0 (LWP 4171309) "lbbs"):
#0  0x00007ffba59a880a in __GI_sendfile64 () at ../sysdeps/unix/syscall-template.S:120
#1  0x0000561b50f99c74 in bbs_sendfile (out_fd=92, in_fd=130, offset=0x7ffb757f37d0, count=5900767) at socket.c:2761
        res = 140717984815120
        written = 0
        localoffset = 0
        pfd = {fd = 92, events = 62, revents = 0}
        __func__ = "bbs_sendfile"
#2  0x00007ffb885b1a6a in send_message (imap=0x7ffb757f9810, fbr=0x7ffb980e5780, item=0x7ffb885fb902 "BODY[]", fp=0x7ffb757f3c58, size=0x7ffb757f3c50, fullname=0x7ffb757f3cc0 "/home/bbs/maildir/1/.REDACTED/cur/1785519021103793,S=5900767,U=817,M=2457:2,S", sendmask=0) at imap_server_fetch.c:599
        sendsize = 5900767
        offset = 524288
        __func__ = "send_message"
#3  0x00007ffb885b2330 in process_fetch_finalize (imap=0x7ffb757f9810, fetchreq=0x7ffb757f5fc0, seqno=2, fullname=0x7ffb757f3cc0 "/home/bbs/maildir/1/.REDACTED/cur/1785519021103793,S=5900767,U=817,M=2457:2,S", response=0x7ffb757f3ed0 "UID 817", responselen=8192, buf=0x7ffb757f5ee0, len=0x7ffb757f5edc) at imap_server_fetch.c:808
        fbr = 0x7ffb980e5780
        fp = 0x7ffb980f79e0
        size = 5900767
        res = 0
        mime = 0x0
        __func__ = "process_fetch_finalize"
#4  0x00007ffb885b3002 in process_fetch (imap=0x7ffb757f9810, usinguid=1, fetchreq=0x7ffb757f5fc0, sequences=0x7ffb757f77d1 "817", tagged=1) at imap_server_fetch.c:1023

This was with TLS. Related to this, when this happened, the IO thread seems to be stuck on poll so something somewhere isn't processing I/O when this happens.

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