On 8/7/2014 11:14 AM, Steffen Kaiser wrote: > one idea: http://www.tldp.org/LDP/abs/html/exitcodes.html > > exit code 134 would be in bash's meaning (if this website is > correct all) some program died off signal 6. This would be Abort in > Linux. > > prepend your script with > > exec >> /tmp/trace 2>&1 set -vx > > that will dump anything visible into /tmp/trace > > - -- Steffen Kaiser
Thank you for your continued assistance, Steffen. You seem to be exactly correct with the Abort signal. I prepended the values you suggested to the pipe script and here's the relevant output: + /usr/lib/dovecot/deliver -d sa-train...@example.com -m Training.SPAM ^A^H5584 prefix=lda: ^A^F5584 io_add(0x1) called twice fd=7, callback=0x7f23489fb6f0 -> 0x7f23489aa530 ^A^D5584 Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x5e271) [0x7f23489e9271] -> /usr/lib/dovecot/libdovecot.so.0(+0x5e34e) [0x7f23489e934e] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f23489a4a9e] -> /usr/lib/dovecot/libdovecot.so.0(ioloop_iolist_add+0x83) [0x7f23489f9533] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handle_add+0x3b) [0x7f23489f9cbb] -> /usr/lib/dovecot/libdovecot.so.0(io_add+0x9b) [0x7f23489f89fb] -> /usr/lib/dovecot/libdovecot.so.0(master_service_io_listeners_add+0x69) [0x7f23489a9e49] -> /usr/lib/dovecot/libdovecot.so.0(master_service_init_finish+0xb0) [0x7f23489a9f90] -> /usr/lib/dovecot/deliver(main+0x1cb) [0x7f234939269b] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f23485e6ec5] -> /usr/lib/dovecot/deliver(+0x31de) [0x7f23493931de] /usr/local/bin/sa-learn-pipe.sh: line 52: 5584 Aborted (core dumped) /usr/lib/dovecot/deliver -d "sa-train...@example.com" -m "Training.$mode" + echo 'Exit status was 134' Does this tell us anything more? I don't see any indication that apparmor is at play, as there is no profile that should apply in this context (and there is nothing in the relevant log file): # service apparmor status apparmor module is loaded. 8 profiles are loaded. 8 profiles are in enforce mode. /sbin/dhclient /usr/bin/freshclam /usr/lib/NetworkManager/nm-dhcp-client.action /usr/lib/connman/scripts/dhclient-script /usr/sbin/clamd /usr/sbin/mysqld /usr/sbin/ntpd /usr/sbin/tcpdump 0 profiles are in complain mode. 4 processes have profiles defined. 4 processes are in enforce mode. /usr/bin/freshclam (2015) /usr/sbin/clamd (1897) /usr/sbin/mysqld (1239) /usr/sbin/ntpd (2472) 0 processes are in complain mode. 0 processes are unconfined but have a profile defined. I'll try to reproduce this on an identically-configured server. I wonder if it would be worth changing the version of Dovecot. But I hate to play whack-a-mole if a more systematic approach is to be had. Thanks again, -Ben
