Re: Compiling kernel-3.4.xxx with gcc-9.x. Need some help.

[Fawad Lateef <fawadlateef@xxxxxxxxx>]

Hi Greg,

On Tue, 30 Mar 2021 at 15:40, Greg KH <greg@xxxxxxxxx> wrote:

On Tue, Mar 30, 2021 at 03:23:10PM +0200, Fawad Lateef wrote:
> So can I still use kernel-3.4 compiled with gcc-5.5, and boot full
> user-space with gcc-9.1?

Yes, of course.

> I was expecting it to be possible but might not work due to
> incompatibility? As I know that when I tried to compile buildroot-2019
> (with latest version of openssl and others) it needs kernel headers
> and then I likely can't use 3.4 kernel.

buildroot might be different, as that is how you are building your whole
system, but there is no dependency on the kernel and userspace to use
the same version of the compiler.  Otherwise everyone would have to
rebuild the world for every time they updated their kernel, this isn't
the BSDs :)

I tried booting the userspace compiled with gcc-9.1 and kernel compiled with gcc-5.5. But seems like the kernel 3.4.111 is not compatible with user-space compiled with gcc-9.1.

During boot getting error: "FATAL: kernel too old." (from init I believe) and then kernel Panics. Log (part) below:

------

[   26.242878] registered taskstats version 1
[   26.247522] axp20_buck3: incomplete constraints, leaving on
[   26.253314] axp20_buck2: incomplete constraints, leaving on
[   26.259161] axp20_ldo4: incomplete constraints, leaving on
[   26.264877] axp20_ldo3: incomplete constraints, leaving on
[   26.270581] axp20_ldo2: incomplete constraints, leaving on
[   26.276299] axp20_ldo1: incomplete constraints, leaving on
[   26.282059] sunxi-rtc sunxi-rtc: setting system clock to 2010-01-01 00:00:00 UTC (1262304000)
[   26.291136] Freeing init memory: 160K
FATAL: kernel too old
[   26.308118] usb 3-1.1: New USB device found, idVendor=148f, idProduct=5572
[   26.315022] usb 3-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   26.322322] usb 3-1.1: Product: 802.11 n WLAN
[   26.326730] usb 3-1.1: Manufacturer: Ralink
[   26.330908] usb 3-1.1: SerialNumber: 1.0
[   26.335055] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00
[   26.335061]
[   26.344221] [<c0011285>] (unwind_backtrace+0x1/0x90) from [<c02bdc4f>] (panic+0x6f/0x15c)
[   26.352400] [<c02bdc4f>] (panic+0x6f/0x15c) from [<c0031fc7>] (do_exit+0x5ff/0x600)
[   26.360057] [<c0031fc7>] (do_exit+0x5ff/0x600) from [<c0032009>] (do_group_exit+0x25/0x78)
[   26.368318] [<c0032009>] (do_group_exit+0x25/0x78) from [<c0032069>] (__wake_up_parent+0x1/0x18)
[   26.377101] [<c0032069>] (__wake_up_parent+0x1/0x18) from [<c000ca81>] (ret_fast_syscall+0x1/0x44)
[   26.386064] CPU1: stopping
[   26.388781] [<c0011285>] (unwind_backtrace+0x1/0x90) from [<c0010707>] (handle_IPI+0x157/0x170)
[   26.397477] [<c0010707>] (handle_IPI+0x157/0x170) from [<c0008393>] (gic_handle_irq+0x3f/0x40)
[   26.406085] [<c0008393>] (gic_handle_irq+0x3f/0x40) from [<c000c65b>] (__irq_svc+0x3b/0x5c)
[   26.414427] Exception stack(0xef065f88 to 0xef065fd0)
[   26.419476] 5f80:                   ffffffed 00000001 1037d000 00000000 ef064000 c04d3c08
[   26.427648] 5fa0: ef064000 ef064000 c04a9a10 ef064018 00000000 00000000 3b9aca00 ef065fd0
[   26.435817] 5fc0: c000d469 c000d46a 60000033 ffffffff
[   26.440870] [<c000c65b>] (__irq_svc+0x3b/0x5c) from [<c000d46a>] (default_idle+0x1a/0x1c)
[   26.449048] [<c000d46a>] (default_idle+0x1a/0x1c) from [<c000d6c1>] (cpu_idle+0x91/0x98)
[   26.457135] [<c000d6c1>] (cpu_idle+0x91/0x98) from [<40480bd9>] (0x40480bd9)
[   26.464181] Rebooting in 10 seconds..
[   36.444472] Restarting Linux version 3.4.113 (flateef@flateef-XPS-13-9360) (gcc version 5.5.0 (Buildroot 2016.02-00152-g83a8d925e-dirty) ) #1 SMP Wed Mar 24 00:29:58 CET 2021
[   36.444482]

----------------------------------------------------- 

Can I do something to make them work together?

Thanks

Fawad Lateef

 

thanks,

greg k-h

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