On 26.12.2017 09:41, Мороз Олег wrote: Hi Олег,
> Have made changes in > > /etc/security/limits.d/core_dump.conf > > then set path to save code dumps into /tmp > > vniiem@sim-ng-data /tmp % /sbin/sysctl -a -r kernel.core > kernel.core_pattern = /tmp/core.%e.%p.%t > kernel.core_pipe_limit = 0 > kernel.core_uses_pid = 0 > > Then relogin and reinstall proftpd, tried to login to ftp , but no > core.dump was generated > So, proftpd seems to trap the SIGSEGV (sig11) and performs a grace shutdown upon SIG11. I've found [1] giving some hints to debug crash problems. I've put debug binaries using --enable-devel=stacktrace on [2]. I've crashed the binaries using a SIGSEGV and found a stack trace in /var/log/proftpd/proftpd.log: 2017-12-27 21:51:07,528 amd64-sid proftpd[23112] amd64-sid: -----BEGIN STACK TRACE----- 2017-12-27 21:51:07,528 amd64-sid proftpd[23112] amd64-sid: [0] /lib/x86_64-linux-gnu/libc.so.6(__select+0x13) [0x7fd99e1c3cc3] 2017-12-27 21:51:07,529 amd64-sid proftpd[23112] amd64-sid: [1] /lib/x86_64-linux-gnu/libc.so.6(__select+0x13) [0x7fd99e1c3cc3] 2017-12-27 21:51:07,529 amd64-sid proftpd[23112] amd64-sid: [2] /usr/sbin/proftpd(+0x1a2d0) [0x5559bc50c2d0] 2017-12-27 21:51:07,529 amd64-sid proftpd[23112] amd64-sid: [3] /usr/sbin/proftpd(+0x1bf2f) [0x5559bc50df2f] 2017-12-27 21:51:07,529 amd64-sid proftpd[23112] amd64-sid: [4] /usr/sbin/proftpd(main+0x94b) [0x5559bc50ece3] 2017-12-27 21:51:07,529 amd64-sid proftpd[23112] amd64-sid: [5] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7fd99e0ff561] 2017-12-27 21:51:07,529 amd64-sid proftpd[23112] amd64-sid: [6] /usr/sbin/proftpd(_start+0x2a) [0x5559bc508daa] 2017-12-27 21:51:07,529 amd64-sid proftpd[23112] amd64-sid: -----END STACK TRACE----- Please install the binary, the stack trace should at least show us if the problematic code is in proftp or anywhere else. The addr2line directions in [1] did not help me, I always got "??:0". At least the stack trace should be a basis to issue a bug @upstream. Many thanks for help! Hilmar [1] http://www.proftpd.org/docs/howto/Compiling.html [2] https://freeshell.de/~hille42/proftpd/stacktrace/ -- #206401 http://counter.li.org
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