[email protected] (Ludovic Courtès) skribis: > (gdb) bt > #0 0x00007f299fb330f1 in __GI___poll (fds=0x1dd58c0, nfds=1, timeout=-1) at > ../sysdeps/unix/sysv/linux/poll.c:29 > #1 0x00007f2994287577 in ssh_poll_ctx_dopoll () from > target:/gnu/store/wmpg67bn7i7pqc0p4xjp1npnqixk9znd-libssh-0.7.6/lib/libssh.so.4 > #2 0x00007f29942884d9 in ssh_handle_packets () from > target:/gnu/store/wmpg67bn7i7pqc0p4xjp1npnqixk9znd-libssh-0.7.6/lib/libssh.so.4 > #3 0x00007f29942885ad in ssh_handle_packets_termination () from > target:/gnu/store/wmpg67bn7i7pqc0p4xjp1npnqixk9znd-libssh-0.7.6/lib/libssh.so.4 > #4 0x00007f2994275080 in ssh_channel_get_exit_status () from > target:/gnu/store/wmpg67bn7i7pqc0p4xjp1npnqixk9znd-libssh-0.7.6/lib/libssh.so.4 > #5 0x00007f29946dd11a in guile_ssh_channel_get_exit_status () from > target:/gnu/store/i3nfl17wfx7sryq6w15r9wxl7ilmq4rb-guile-ssh-0.11.3/lib/libguile-ssh.so.11 > #6 0x00007f29a1765965 in vm_regular_engine (thread=0x1dd58c0, vp=0x1d4df30, > registers=0xffffffff, resume=-1615646479) at vm-engine.c:786 > #7 0x00007f29a1768fba in scm_call_n (proc=#<program 7f29a1be0030>, > argv=argv@entry=0x7ffc76b1ece8, nargs=nargs@entry=1) at vm.c:1257 > #8 0x00007f29a16ecff7 in scm_primitive_eval ( > exp=exp@entry=((@ (ice-9 control) %) (begin ((@@ (ice-9 command-line) > load/lang) > "/gnu/store/zz3b7j4iv6v143v7cqyr77k83zc5n3zw-guix-0.15.0-6.f9a8fce/bin/.guix-real") > (main (command-line)) (quit)))) at eval.c:662 > #9 0x00007f29a16ed053 in scm_eval ( > exp=((@ (ice-9 control) %) (begin ((@@ (ice-9 command-line) load/lang) > "/gnu/store/zz3b7j4iv6v143v7cqyr77k83zc5n3zw-guix-0.15.0-6.f9a8fce/bin/.guix-real") > (main (command-line)) (quit))), > module_or_state=module_or_state@entry="#<struct module>" = {...}) at > eval.c:696 > #10 0x00007f29a1738220 in scm_shell (argc=11, argv=0x1dd5280) at script.c:454 > > (gdb) frame 0 > #0 0x00007f299fb330f1 in __GI___poll (fds=0x1dd58c0, nfds=1, timeout=-1) at > ../sysdeps/unix/sysv/linux/poll.c:29 > 29 in ../sysdeps/unix/sysv/linux/poll.c > (gdb) p *fds > $1 = {fd = 14, events = 1, revents = 0} > (gdb) shell ls -l /proc/12605/fd > total 0 > lr-x------ 1 root root 64 Nov 2 11:20 0 -> 'pipe:[44413497]' > l-wx------ 1 root root 64 Nov 2 11:33 1 -> 'pipe:[44413496]' > lr-x------ 1 root root 64 Nov 2 11:33 10 -> 'pipe:[44459532]' > l-wx------ 1 root root 64 Nov 2 11:33 11 -> 'pipe:[44459532]' > lr-x------ 1 root root 64 Nov 2 11:33 12 -> 'pipe:[44429590]' > l-wx------ 1 root root 64 Nov 2 11:33 13 -> 'pipe:[44429590]' > lrwx------ 1 root root 64 Nov 2 11:33 14 -> 'socket:[44444783]' > lrwx------ 1 root root 64 Nov 2 11:33 15 -> 'socket:[44444784]' > l-wx------ 1 root root 64 Nov 2 11:33 16 -> > /var/guix/offload/141.80.167.140/0
When that happens, the guile process on the remote node that runs the ‘redirect’ code of ‘remote-daemon-channel’ is stuck in select(2) with infinite timeout. Note on berlin the build nodes are still running Guile 2.2.2, vulnerable to the ‘select’ bug <https://bugs.gnu.org/30365>, which we ‘redirect’ supposedly works around. Ludo’.
