[rt-devel:linux-6.8.y-rt] [serial] 0a81ac5ba5: Kernel_panic-not_syncing:No_working_init_found

[rt-devel:linux-6.8.y-rt] [serial] 0a81ac5ba5: Kernel_panic-not_syncing:No_working_init_found

[kernel test robot]

Hello,

kernel test robot noticed "Kernel_panic-not_syncing:No_working_init_found" on:

commit: 0a81ac5ba5b985c0803c4f0d9272578fc7b1d361 ("serial: 8250: Switch to nbcon console")
https://git.kernel.org/cgit/linux/kernel/git/rt/linux-rt-devel.git linux-6.8.y-rt

in testcase: boot

compiler: clang-17
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)


we cannot connect the issue with the code, but by more runs, the issue still
shows on this commit and keeps clean on parent.

we also noticed the issue doesn't always happen on this commit, as below,
happens 15 times out of 20 runs.

dd0b9d75b0ea983e 0a81ac5ba5b985c0803c4f0d927
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :20          75%          15:20    dmesg.Kernel_panic-not_syncing:No_working_init_found
           :20          75%          15:20    dmesg.boot_failures




If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202402052207.a61afe51-lkp@intel.com


[  217.891235][    T1]     LKP_SERVER=internal-lkp-server
[  217.892392][    T1]     selinux=0
[  217.893299][    T1]     prompt_ramdisk=0
[  217.894242][    T1]     vga=normal
[  217.930082][    T1] Starting init: /bin/sh exists but couldn't execute it (error -8)
[  217.931991][    T1] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
[  217.933840][    T1] CPU: 0 PID: 1 Comm: swapper Tainted: G                TN 6.8.0-rc1-00059-g0a81ac5ba5b9 #1
[  217.935596][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[  217.936883][    T1] Call Trace:
[  217.937287][    T1]  <TASK>
[ 217.937698][ T1] dump_stack_lvl (kbuild/src/consumer/lib/dump_stack.c:?) 
[ 217.938293][ T1] panic (kbuild/src/consumer/kernel/panic.c:284) 
[ 217.938820][ T1] ? rest_init (kbuild/src/consumer/init/main.c:1433) 
[ 217.939385][ T1] kernel_init (main.c:?) 


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240205/202402052207.a61afe51-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [rt-devel:linux-6.8.y-rt] [serial] 0a81ac5ba5: Kernel_panic-not_syncing:No_working_init_found

[Sebastian Andrzej Siewior]

On 2024-02-05 22:23:16 [+0800], kernel test robot wrote:
> kernel test robot noticed "Kernel_panic-not_syncing:No_working_init_found" on:
…
> ---------------- ---------------------------
>        fail:runs  %reproduction    fail:runs
>            |             |             |
>            :20          75%          15:20    dmesg.Kernel_panic-not_syncing:No_working_init_found
>            :20          75%          15:20    dmesg.boot_failures
…
> [  217.931991][    T1] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.

Before that, there is:
| [  201.601164][  T219] request_module: modprobe binfmt-464c cannot be processed, kmod busy with 50 threads for more than 5 seconds now
| [  201.790029][    T1] Failed to execute /init (error -8)
| [  217.930082][    T1] Starting init: /bin/sh exists but couldn't execute it (error -8)

I *think* there is some kind of memory corruption and the init-ELF file
isn't recognized. I don't think this related to printk.
Did you see similar reports to this one? This is -rc1 based. I'm going
to release rc4 based something today with printk mostly unchanged. Will
be interesting to see if this comes back or not.

Sebastian