[exim] occasional segmentation faults in exim 4.50 on FreeBS…

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Autor: Chris Lightfoot
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A: exim-users
Assumpte: [exim] occasional segmentation faults in exim 4.50 on FreeBSD
We're seeing exim (4.50, compiled from ports on FreeBSD
5.21) occasionally crash with signal 11 during message
submission from a PHP script. I haven't been able to
reproduce the problem in controlled conditions (we have a
periodic script which sends mail to a bunch of recipients
which provokes it). The same problem occured with the
previous exim version.

I do have a stack trace from the crash, though. This was
obtained by adding a signal handler for SIGSEGV which
sleeps to give an opportunity to attach a debugger. This
one came from a process doing
    exim -Mc 1DDfbC-000Pc3-AY


I haven't had a chance to look at the code in any detail
yet, but it looks like the crash is occuring after exim
has negotiated TLS with a remote SMTP server.

Has anyone seen anything like this before?

#0  0x284f00cf in nanosleep () from /lib/libc.so.5
#1  0x284e420f in sleep () from /lib/libc.so.5
#2  0x080b8fb2 in crash_signal_handler ()
#3  <signal handler called>
#4  0x080a87f6 in string_vformat (buffer=0xbfbfe4f0 "Ñ\016", buflen=0, 
    format=0x80f4e96 "%s %s\r\n", ap=0x80efe85 "EHLO") at string.c:1113
#5  0x080a42c4 in smtp_write_command (outblock=0xbfbfe4f0, noflush=0, 
    format=0xf0 <Error reading address 0xf0: Bad address>) at smtp_out.c:315
#6  0x080cdad9 in smtp_deliver (addrlist=0x811f388, host=0x811f868, 
    host_af=240, port=25, 
    interface=0xf0 <Error reading address 0xf0: Bad address>, 
    tblock=0x811cca8, copy_host=0, message_defer=0xbfbfe5dc, suppress_tls=0)
    at smtp.c:1011
#7  0x080cff49 in smtp_transport_entry (tblock=0x811cca8, addrlist=0x811f388)
    at smtp.c:2456
#8  0x08063339 in do_remote_deliveries (fallback=0) at deliver.c:3754
#9  0x080661bb in deliver_message (id=0xbfbfed69 "1DDfbC-000Pc3-AY", forced=0, 
    give_up=0) at deliver.c:5779
#10 0x0806ef0e in main (argc=3, cargv=0xbfbfec78) at exim.c:3767
#11 0x08056de2 in _start ()


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