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dbautista
n00b
Joined: 11 Nov 2006
Posts: 17
Location: Las Palmas de G.C.
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 Posted: Wed Jan 31, 2024 1:11 pm Post subject: How to get the full trace in a Kernel panic on boot |
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I'm trying the RT sources sys-kernel/rt-sources-6.6.10_p19 and I have a painful Kernel panic while booting... but I only see the last trace lines and I can't figure out the root cause.
Is there a way to save the trace in a log or making the font smaller so I can see more lines?
This is what I can see:
| Code: | ret_from_fork_asm+0x1b/0x30
</TASK>
Modules linked in:
CR2: 00000000000000b8
---[ end trace 0000000000000000 ]---
RIP: 0010:nbcon_release+0x37/0xa0
Code: 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 48 c7 44 24 08 00 00 00 00 48
c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 <80> bb b8 00 00 00 00 48 89
1c 24 48 c7 44 24 20 00 00 00 00 c7 44
RSP: 0000:ffffc90000023d80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000001 RDI: ffffffff82c50ba0
RBP: 00000000000000ff R08: ffffffff82546810 R09: 0000000000000000
R10: ffff888101c75ec0 R11: ffffffffffc38000 R12: 00000000000000ff
R13: 0000000000000202 R14: 000000000000000f R15: ffffffff82c50ba0
FS: 0000000000000000(0000) GS:ffff88840f600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b8 CR3: 000000000242c001 CR4: 00000000000606f0
note: swapper/0[1] exited with irqs disabled
note: swapper/0[1] exited with preempt_count 1
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
Kernel Offset: disabled
---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 ]--- |
Thank you in advance! |
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sublogic
Apprentice
Joined: 21 Mar 2022
Posts: 222
Location: Pennsylvania, USA
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| Posted: Wed Jan 31, 2024 11:33 pm Post subject: Re: How to get the full trace in a Kernel panic on boot |
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| dbautista wrote: | | Code: | | Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 |
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It seems your /sbin/init died . The problem may be there rather than with the kernel. Still, that's bizarre.
Do you have or can you make an initramfs, and can you boot the failing kernel to a rescue shell without crashing ? If so, there is a way to get the full dmesg.
EDIT: If no initramfs, try booting with init=/bin/sh and hope you get a shell prompt, then do exec /sbin/init from the shell and see if you panic.
EDIT 2: Uh, I'm assuming you run openrc; if you're on sytemd, the /sbin/init is probably wrong.
But first, boot a working kernel and look under /sys/fs/pstore in case the dmesg is already there waiting for you. (Doesn't work on my machines, I have to do it the hard way.) |
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Hu
Moderator
Joined: 06 Mar 2007
Posts: 21639
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| Posted: Wed Jan 31, 2024 11:54 pm Post subject: |
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"Attempted to kill init" is somewhat normal for initramfs users when the initramfs is buggy (such as being a shell script that does not recover from errors properly).
OP: have prior kernels worked correctly on this system? Do prior kernels still work now, or does the system panic regardless of which kernel you boot? If you use a non-realtime kernel 6.6.x, does that succeed? |
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dbautista
n00b
Joined: 11 Nov 2006
Posts: 17
Location: Las Palmas de G.C.
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| Posted: Mon Feb 05, 2024 11:19 pm Post subject: |
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Hey! Sorry for the delay.
OpenRC, no initramfs.
Other kernels work: tested with kernel-6.6.13-gentoo and kernel-6.5.2-rt8.
Tried to boot with init=/bin/sh, no luck. Still the same error. No /sys/fs/pstore either. |
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dbautista
n00b
Joined: 11 Nov 2006
Posts: 17
Location: Las Palmas de G.C.
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| Posted: Wed Mar 06, 2024 6:42 pm Post subject: Solved! |
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After having the same kernel panics with sys-kernel/rt-sources-6.6.10_p19 and with sys-kernel/rt-sources-6.6.15_p22, it's finally SOLVED with sys-kernel/rt-sources-6.6.20_p25. No kernel panics!
It's sad that I still don't know how to get the full trace in a Kernel panic on boot, though... |
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