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JOURNAL.md
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JOURNAL.md
@ -3749,3 +3749,151 @@ problems with the boot.
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Now that we have a CI pipeline, let's try making the whole boot process
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Now that we have a CI pipeline, let's try making the whole boot process
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automatic, so I don't have to type anything. This basically requires setting the
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automatic, so I don't have to type anything. This basically requires setting the
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environment in U-Boot.
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environment in U-Boot.
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<<< NixOS Stage 1 >>>
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An error occurred in stage 1 of the boot process, which must mount the
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root filesystem on `/mnt-root' and then start stage 2. Press one
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of the following keys:
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i) to launch an interactive shell
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f) to start an interactive shell having pid 1 (needed if you want to
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start stage 2's init manually)
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[ 22.365260] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] An error occurred in stage 1 of the boot process, which must mount the
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r) to reboot immediately
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*) to ignore the error and continue
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[ 22.526780] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] root filesystem on `/mnt-root' and then start stage 2. Press one
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[ 22.611640] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] of the following keys:
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[ 22.697460] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] i) to launch an interactive shell
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[ 22.788100] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] f) to start an interactive shell having pid 1 (needed if you want to
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[ 22.874060] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] start stage 2's init manually)
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[ 22.957940] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] r) to reboot immediately
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[ 23.042520] stage-1-init: [Thu Jan 1 00:00:22 UTC 1970] *) to ignore the error and continue
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iStarting interactive shell...
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[ 32.314080] stage-1-init: [Thu Jan 1 00:00:32 UTC 1970] Starting interactive shell...
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~ # cat /proc/sys/kernel/random
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random/ randomize_va_space
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~ # cat /proc/sys/kernel/random/entropy_avail
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0
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Let's see what happens with strace.
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## 2024-09-02
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Interestingly, I managed to reach the login console and run some commands after
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fully booting NixOS. I just needed to disable nscd and enable a daemon to fill
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the entropy pull, which is depleted on boot.
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I'm not looking at the nscd binary, which works ok when running `nscd -V` but
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hangs the CPU when running `nscd --invalidate group`. I tried executing it under
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GDB and then ^C, but it doesn't respond.
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As always, we don't have JTAG support ready, so this is going to be an absolute
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pain to debug. I could bisect the code and try to guess at which point it must
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be failing. But each attempt will take around 30 minutes, so it is extremely
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expensive.
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It would be nice to reproduce this in the initrd shell, which loads much faster.
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# not strictly required, but you'll likely want the log anyway
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(gdb) set logging on
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# ask gdb to not stop every screen-full
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(gdb) set height 0
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(gdb) while 1
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> x/i $pc
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> stepi
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> end
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Interestingly, I can step up to the end of the program, but it seems to be
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failing:
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(gdb) r
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Starting program: /nix/store/nh1f85icnvlqs3dc8lv2ya0ylmljsfax-system-path/bin/nscd --invalidate group
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[Thread debugging using libthread_db enabled]
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Using host libthread_db library "/nix/store/47a03qi49pwlk3hxpfwx2vq671mlqn57-glibc-riscv64-unknown-linux-gnu-2.39-52/lib/libthread_db.so.1".
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Breakpoint 1, 0x0000002aaaaaf738 in main ()
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(gdb) while 1
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>x/i $pc
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>nexti
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>end
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=> 0x2aaaaaf738 <main+56>: jal 0x2aaaaaf160 <setlocale@plt>
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0x0000002aaaaaf73c in main ()
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=> 0x2aaaaaf73c <main+60>: auipc a0,0x19
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0x0000002aaaaaf740 in main ()
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=> 0x2aaaaaf740 <main+64>: ld a0,1580(a0)
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0x0000002aaaaaf744 in main ()
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=> 0x2aaaaaf744 <main+68>: jal 0x2aaaaaf690 <textdomain@plt>
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0x0000002aaaaaf748 in main ()
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=> 0x2aaaaaf748 <main+72>: li a5,0
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0x0000002aaaaaf74c in main ()
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=> 0x2aaaaaf74c <main+76>: addi a4,sp,8
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0x0000002aaaaaf750 in main ()
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=> 0x2aaaaaf750 <main+80>: li a3,0
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0x0000002aaaaaf754 in main ()
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=> 0x2aaaaaf754 <main+84>: mv a2,s1
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0x0000002aaaaaf758 in main ()
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=> 0x2aaaaaf758 <main+88>: mv a1,s0
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0x0000002aaaaaf75c in main ()
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=> 0x2aaaaaf75c <main+92>: auipc a0,0x19
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0x0000002aaaaaf760 in main ()
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=> 0x2aaaaaf760 <main+96>: addi a0,a0,-1852
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0x0000002aaaaaf764 in main ()
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=> 0x2aaaaaf764 <main+100>: jal 0x2aaaaaef30 <argp_parse@plt>
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[Inferior 1 (process 1962) exited with code 01]
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No registers.
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Using passwd instead hangs the CPU before reaching the main:
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[root@nixos-riscv:~]# gdb --args $(which nscd) --invalidate passwd
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GNU gdb (GDB) 14.2
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Copyright (C) 2023 Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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Type "show copying" and "show warranty" for details.
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This GDB was configured as "riscv64-unknown-linux-gnu".
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Type "show configuration" for configuration details.
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For bug reporting instructions, please see:
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<https://www.gnu.org/software/gdb/bugs/>.
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Find the GDB manual and other documentation resources online at:
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<http://www.gnu.org/software/gdb/documentation/>.
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For help, type "help".
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Type "apropos word" to search for commands related to "word"...
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Reading symbols from /run/current-system/sw/bin/nscd...
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(No debugging symbols found in /run/current-system/sw/bin/nscd)
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(gdb) b main
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Breakpoint 1 at 0x5738
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(gdb) b argp_parse
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Breakpoint 2 at 0x4f38
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(gdb) c
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The program is not being run.
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(gdb) r
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Starting program: /nix/store/nh1f85icnvlqs3dc8lv2ya0ylmljsfax-system-path/bin/nscd --invalidate passwd
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It's probably not deterministic.
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I have also disabled kaslr by adding nokaslr to the bootargs.
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Anyway, doesn't make much sense to debug this on userland and pay 30 minutes for
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each test. I'll wait until we have proper JTAG support or a similar way to dump
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the registers on a crash.
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# 2024-09-03
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Wrote a small tool `plictool` to dump the state of the PLIC:
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~ # plictool -c 2
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plic=0x40800000 nsources=1024 ncontexts=2
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src=1 pend=0 prio=1 ctx=1 thre=1
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src=2 pend=0 prio=1
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src=3 pend=0 prio=1
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src=4 pend=1 prio=1
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src=33 pend=0 prio=0 ctx=1 thre=1
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Interestingly, the auxiliar UART interrupts don't seem to be working very well.
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Also, is there another source 33 enabled?
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