On Mon, 29 Jun 2020 16:36:33 +0100 Jose M Calhariz <jose.calha...@tecnico.ulisboa.pt> wrote:
> On my main amanda installation I have a client that gives time out > when doing backups. I have researched and checked out the most common > problems. In the end I have found that: > > - "amcheck Config -c client" gives 30 seconds of timeout. I do not see that. I checked two clients, one AMD64, the other i386. > > - I do not have any clue on the logs at the client. > > - Running the command by hand on the client I get segmentation fault. > > /usr/lib/amanda/amandad -auth=ssh amdump > Segmentation fault I see that, on both machines. > > - Running the command inside gdb I see a NULL pointer. > > gdb /usr/lib/amanda/amandad > GNU gdb (Debian 8.2.1-2+b3) 8.2.1 I do not have symbols installed, so of course I can't examine the variables. I do see a segment fault: ... (gdb) run -auth=ssh amdump Starting program: /usr/lib/amanda/amandad -auth=ssh amdump [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00007ffff7f3a687 in stream_sendpkt () from /usr/lib/x86_64-linux-gnu/amanda/libamanda-3.5.1.so (gdb) ... I have no idea what is going on here, not having the source in front of me. But I wonder if this is because amanda is trying to use an SSH connection that isn't there? The first time, I SSHed in as root, did an su - to backup, then ran gdb. To test my hypothesis above, I went to my amanda server, su - to backup, then sshed to the client. This time I did not get a seg fault, and used Ctl-c to end the process: (gdb) run -auth=ssh amdump Starting program: /usr/lib/amanda/amandad -auth=ssh amdump [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". ^C Program received signal SIGINT, Interrupt. 0x00007ffff76a27e4 in __GI___poll (fds=0x55555559e3d0, nfds=2, timeout=30000) at ../sysdeps/unix/sysv/linux/poll.c:29 29 ../sysdeps/unix/sysv/linux/poll.c: No such file or directory. (gdb) This is with the bog standard Buster version of amanda: root@dzur:~# pre amanda amanda-client 1:3.5.1-2+b2 amd64 amanda-common 1:3.5.1-2+b2 amd64 root@dzur:~# -- Does anybody read signatures any more? https://charlescurley.com https://charlescurley.com/blog/
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