Re: Kernel crash before login prompt

Hello Andrew,
We enabled all the 4cpu’s and attached is the log,
Just before the crash we are observing cpu = -65536 in sched_add, attached is the complete log for your reference.

-----In sched_add and td = 0xffff000041db6260, cpu=-65536, flags = 0x4

Regards
Faisal



Juniper Business Use Only

From: Sha Faisal <[email protected]>
Date: Thursday, 29 June 2023 at 21:15
To: [email protected] <[email protected]>
Cc: [email protected] <[email protected]>, Steve Kiernan <[email protected]>, Mahesh Vardhamanaiah <[email protected]>, Amit Verma <[email protected]>
Subject: Re: Kernel crash before login prompt
The SoC has 4 CPU’s, but we have restricted it to only one by disabling other 3.

So the cpu value should be 0, I can confirm, with a print, because we are not getting the function frame for the functions calling __mtx_lock_spin_flags

Regards
Faisal

From: [email protected] <[email protected]>
Date: Thursday, 29 June 2023 at 20:49
To: Sha Faisal <[email protected]>
Cc: [email protected] <[email protected]>, Steve Kiernan <[email protected]>, Mahesh Vardhamanaiah <[email protected]>, Amit Verma <[email protected]>
Subject: Re: Kernel crash before login prompt
[External Email. Be cautious of content]


On 2023-06-29 16:03, Sha Faisal wrote:
> Hello Andrew,
>
> The addr2line for the address points to,
>
> [sfaisal@svl-bsdx-02 /b/sfaisal/stable_main/src]$ addr2line -e
> ../obj/arm64/juniper/kernels/JNPR-ARM64-WIT/kernel/kernel.full -f
> 0xffff0000002244dc
>
> sched_add
>
> /b/sfaisal/stable_main/src/sys/kern/sched_ule.c:1309
>
> Sched_setcpu is the exact function which calls
> TDQ_LOCK(__mtx_lock_spin_flags) , and sched_setcpu is an inline called
> from sched_add()

What cpu is being passed in to sched_setcpu?

Andrew