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Date: Tue, 27 Oct 2015 09:37:20 -0400
From: Jan Schaumann <jschauma@netmeister.org>
To: users@httpd.apache.org
Message-ID: <20151027133720.GG323@netmeister.org>
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 <CALK=YjMojKn319YbAj=xVyQ-0Jh01n2KJ3+VeZaPHtAXJdpReQ@mail.gmail.com>
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 <CALK=YjMojKn319YbAj=xVyQ-0Jh01n2KJ3+VeZaPHtAXJdpReQ@mail.gmail.com>
User-Agent: Mutt/1.5.19 (2009-01-05)
Subject: Re: [users@httpd] apache 2.4 directory autoindex corrupted

Eric Covener <covener@gmail.com> wrote:
 
> Pretty odd, can you strace/truss and see what comes back for readdir/stat/???

I see just what it sounded like: httpd tries to mmap a much larger file
than it actually has:

  1878     27 httpd    CALL  __stat50(0x7f7ff7bb16f0,0x7f7fecbff780)
  1878     27 httpd    NAMI  "/usr/pkg/share/httpd/htdocs/tmp/f"
  1878     27 httpd    RET   __stat50 0
  1878     27 httpd    CALL  open(0x7f7ff7bb17e0,0,0)
  1878     27 httpd    NAMI  "/usr/pkg/share/httpd/htdocs/tmp/f"
  1878     27 httpd    RET   open 8
  1878     27 httpd    CALL  fcntl(8,1,0)
  1878     27 httpd    RET   fcntl 0
  1878     27 httpd    CALL  fcntl(8,2,1)
  1878     27 httpd    RET   fcntl 0
  1878     27 httpd    CALL  open(0x7f7fecbfc440,0,0x2e2e2e2e)
  1878     27 httpd    NAMI  "/usr/share/zoneinfo/GMT"
  1878     27 httpd    RET   open 9
  1878     27 httpd    CALL  read(9,0x7f7ff7bb8000,0x7c68)
  1878     27 httpd    GIO   fd 9 read 118 bytes
       "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\^A\0\0\0\^A\0\0\0\0\0\0\0\0\0\0\0\^A\0\0\0\^D\0\
        \0\0\0\0\0GMT\0\0\0TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\^A\0\0\0\^A\0\0\0\0\0\0\0\0\0\
        \0\0\^A\0\0\0\^D\0\0\0\0\0\0GMT\0\0\0\nGMT0\n"
  1878     27 httpd    RET   read 118/0x76
  1878     27 httpd    CALL  close(9)
  1878     27 httpd    RET   close 0
  1878     27 httpd    CALL  read(7,0x7f7ff7bb2048,0x1f40)
  1878     27 httpd    RET   read -1 errno 35 Resource temporarily unavailable
  1878     27 httpd    CALL  mmap(0,0x800,1,1,8,0,0)
  1878     27 httpd    RET   mmap 140187597938688/0x7f7ff7fa2000
  1878     27 httpd    CALL  writev(7,0x7f7fecbffa00,2)
  1878     27 httpd    GIO   fd 7 wrote 2251 bytes
       "HTTP/1.1 200 OK\r\nDate: Tue, 27 Oct 2015 13:23:43
GMT\r\nServer: Apache/2.4.16 (Unix)\r\n\
        Last-Modified: Tue, 27 Oct 2015 02:51:54 GMT\r\nETag:
\"800-5230d290fc802\"\r\nAccept-Rang\
        es: bytes\r\nContent-Length:
2048\r\n\r\nfoo\n\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
...


Ie httpd tries to mmap 2K:

  1878     27 httpd    CALL  mmap(0,0x800,1,1,8,0,0)


> Maybe httpd/APR is compiled against some weird non-ABI compatible
> system headers?

Hmmm.  This is apache-2.4.16 from NetBSD pkgsrc; I've tried both a
binary package provided by NetBSD as well as a locally compiled pkgsrc
version.

Next up: manually compiling vanilla httpd, I suppose. :-/

-Jan

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