Re: Possible to redirect real init's message to netconsole?
Dear Ben,
On Wed, Feb 3, 2016 at 2:00 AM, Ben Hutchings <ben@decadent.org.uk> wrote:
> On Wed, 2016-02-03 at 01:50 +0900, Roger Shimizu wrote:
>> Dear initramfs-tools maintainer,
>>
>> By command "exec >/dev/kmsg 2>&1" in init, which was introduced by
>> commit 3acddc [0], kernel messages can all redirected to netconsole
>> with no problem.
>>
>> I want some bit more, that to redirect service start/stop messages
>> from sysvinit/systemd to netconsole as well.
>>
>> I already tried to replace ">${rootmnt}/dev/console" with
>> ">${rootmnt}/dev/kmsg" in the final block of "init" script, but with
>> no luck.
>> I'm now wondering whether it's possible under initramfs-tools.
>> Maybe the right way is to hack systemd/sysvinit?
>>
>> [0]: https://anonscm.debian.org/cgit/kernel/initramfs-tools.git/commit/?id=3acddcce9763192ffd169b32a511542adf1282f2
>
> run-init resets the standard error streams. You could try adding
> "-c /dev/kmsg" to the run-init command line.
Thanks for your feedback!
However, I add "-c /dev/kmsg", and the command looks like:
exec run-init -c /dev/kmsg ${drop_caps} ${rootmnt} ${init} "$@"
<${rootmnt}/dev/console >${rootmnt}/dev/console 2>&1
The result is kernel panic:
[ 8.064410] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000100
[ 8.064410]
[ 8.073562] CPU: 0 PID: 1 Comm: run-init Not tainted
3.16.0-4-kirkwood #1 Debian 3.16.7-ckt20-1+deb8u3
[ 8.082889] [<c00100c4>] (unwind_backtrace) from [<c000c45c>]
(show_stack+0x18/0x1c)
[ 8.090642] [<c000c45c>] (show_stack) from [<c03abda0>] (panic+0x80/0x1f8)
[ 8.097536] [<c03abda0>] (panic) from [<c001bcac>] (do_exit+0x470/0x884)
[ 8.104253] [<c001bcac>] (do_exit) from [<c001c0fc>] (do_group_exit+0x0/0xb4)
[ 8.111396] [<c001c0fc>] (do_group_exit) from [<c0009400>]
(ret_fast_syscall+0x0/0x34)
Cheers,
--
Roger Shimizu, GMT +9 Tokyo
PGP/GPG: 17B3ACB1
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