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HTTP/2: fixed sendfile() aio handling. With sendfile() in threads ("aio threads; sendfile on;"), client connection can block on writing, waiting for sendfile() to complete. In HTTP/2 this might result in the request hang, since an attempt to continue processing in thread event handler will call request's write event handler, which is usually stopped by ngx_http_v2_send_chain(): it does nothing if there are no additional data and stream->queued is set. Further, HTTP/2 resets stream's c->write->ready to 0 if writing blocks, so just fixing ngx_http_v2_send_chain() is not enough. Can be reproduced with test suite on Linux with: TEST_NGINX_GLOBALS_HTTP="aio threads; sendfile on;" prove h2*.t The following tests currently fail: h2_keepalive.t, h2_priority.t, h2_proxy_max_temp_file_size.t, h2.t, h2_trailers.t. Similarly, sendfile() with AIO preloading on FreeBSD can block as well, with similar results. This is, however, harder to reproduce, especially on modern FreeBSD systems, since sendfile() usually does not return EBUSY. Fix is to modify ngx_http_v2_send_chain() so it actually tries to send data to the main connection when called, and to make sure that c->write->ready is set by the relevant event handlers.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 25 Nov 2021 22:02:10 +0300
parents 400711951595
children
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charset_map  koi8-r  windows-1251 {

    80  88 ; # euro

    95  95 ; # bullet

    9A  A0 ; # &nbsp;

    9E  B7 ; # &middot;

    A3  B8 ; # small yo
    A4  BA ; # small Ukrainian ye

    A6  B3 ; # small Ukrainian i
    A7  BF ; # small Ukrainian yi

    AD  B4 ; # small Ukrainian soft g
    AE  A2 ; # small Byelorussian short u

    B0  B0 ; # &deg;

    B3  A8 ; # capital YO
    B4  AA ; # capital Ukrainian YE

    B6  B2 ; # capital Ukrainian I
    B7  AF ; # capital Ukrainian YI

    B9  B9 ; # numero sign

    BD  A5 ; # capital Ukrainian soft G
    BE  A1 ; # capital Byelorussian short U

    BF  A9 ; # (C)

    C0  FE ; # small yu
    C1  E0 ; # small a
    C2  E1 ; # small b
    C3  F6 ; # small ts
    C4  E4 ; # small d
    C5  E5 ; # small ye
    C6  F4 ; # small f
    C7  E3 ; # small g
    C8  F5 ; # small kh
    C9  E8 ; # small i
    CA  E9 ; # small j
    CB  EA ; # small k
    CC  EB ; # small l
    CD  EC ; # small m
    CE  ED ; # small n
    CF  EE ; # small o

    D0  EF ; # small p
    D1  FF ; # small ya
    D2  F0 ; # small r
    D3  F1 ; # small s
    D4  F2 ; # small t
    D5  F3 ; # small u
    D6  E6 ; # small zh
    D7  E2 ; # small v
    D8  FC ; # small soft sign
    D9  FB ; # small y
    DA  E7 ; # small z
    DB  F8 ; # small sh
    DC  FD ; # small e
    DD  F9 ; # small shch
    DE  F7 ; # small ch
    DF  FA ; # small hard sign

    E0  DE ; # capital YU
    E1  C0 ; # capital A
    E2  C1 ; # capital B
    E3  D6 ; # capital TS
    E4  C4 ; # capital D
    E5  C5 ; # capital YE
    E6  D4 ; # capital F
    E7  C3 ; # capital G
    E8  D5 ; # capital KH
    E9  C8 ; # capital I
    EA  C9 ; # capital J
    EB  CA ; # capital K
    EC  CB ; # capital L
    ED  CC ; # capital M
    EE  CD ; # capital N
    EF  CE ; # capital O

    F0  CF ; # capital P
    F1  DF ; # capital YA
    F2  D0 ; # capital R
    F3  D1 ; # capital S
    F4  D2 ; # capital T
    F5  D3 ; # capital U
    F6  C6 ; # capital ZH
    F7  C2 ; # capital V
    F8  DC ; # capital soft sign
    F9  DB ; # capital Y
    FA  C7 ; # capital Z
    FB  D8 ; # capital SH
    FC  DD ; # capital E
    FD  D9 ; # capital SHCH
    FE  D7 ; # capital CH
    FF  DA ; # capital hard sign
}