Re: Perf: RIP: 0010:__schedule on qemu-x86_64

[Naresh Kamboju]

HI Joel,

On Thu, 25 May 2023 at 20:51, Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> wrote:
>
> Hello Naresh,
>
> On Wed, May 24, 2023 at 5:02 AM Naresh Kamboju
> <naresh.kamboju@xxxxxxxxxx> wrote:
> >
> > Following kernel crash noticed while running perf testing on qemu-x86_64
> > with stable-rc 6.3.4-rc2 + kselftest merge configs.
> >
> > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
> >
> > logs:
> > =====
> > INFO: Performing perf record test...
> >
> > Parse sched tracepoints fields: Ok
> >  16: syscalls:sys_enter_openat event fields     :
> > --- start ---
> > test child forked, pid 255
> > <4>[  152.221288] int3: 0000 [#1] PREEMPT SMP PTI
> > <4>[  152.221564] CPU: 0 PID: 255 Comm: perf Not tainted 6.3.4-rc2 #1
> > <4>[  152.221607] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009),
> > BIOS 1.14.0-2 04/01/2014
> > <4>[  152.221733] RIP: 0010:__schedule+0x29e/0xaa0

<trim>

> I wonder if this is a deadlock related to runqueue lock since another
> CPU call stack are similarly in schedule.
>
> I tried to run gdb on your vmlinux but it does not have symbols, would
> it be possible for you to provide a copy of vmlinux with symbols?

DEBUG_INFO not enabled on this build.

>
> Were you able to narrow down the commit/release using git bisect to
> see when it started happening?

I will bisect this problem and get back to you.

>
> Thank you,
>
>  - Joel

- Naresh