Bug#377857: further observations with exim4-daemon-light

[Chris Lightfoot]

The problem does not appear to exhibit with
exim4-daemon-light, at least not after the 31 minutes of
testing I did. However, it definitely *does* exhibit if
you start exim4-daemon-light with,

    LD_PRELOAD=/lib/libpthread.so.0 /usr/sbin/exim4 -bd -q30m

-- the stack trace suggests exactly the same problem,
though I don't have line numbers in this build:

#0  0x00000000 in ?? ()
#1  0x40023825 in __pthread_sighandler () from /lib/libpthread.so.0
#2  <signal handler called>
#3  0x4023f5d9 in __libc_sigaction () from /lib/libc.so.6
#4  0x40020828 in sigaction () from /lib/libpthread.so.0
#5  0x08082945 in os_non_restarting_signal ()
#6  0x0805b133 in daemon_go ()
#7  0x0806a598 in main ()

i.e., again consistent with there being some badness in
the interaction between -lpthread and the signal handling
code in exim.

-- 
Chris Lightfoot
mySociety