RDB3-v1.1-pfe-calltrace-when-CONFIG_FUNCTION_TRACER-enabled-based-on-bsp41

[hittzt]

Hi,

I noticed that, the S32G's SDK BSP41 has been released, and I tested some features recently.

But when I tested pfe with v6.6 kernel, I caught the following calltrace when the kernel config FUNCTION_TRACER enabled:

[ 8.043360] ------------[ cut here ]------------
[ 8.047582] Misaligned patch-site 0xffffffc0793f59f4
[ 8.052811] WARNING: CPU: 2 PID: 198 at ftrace_call_adjust+0x64/0x70
[ 8.052833] Modules linked in: sja1110(O)
[ 8.052851] CPU: 2 PID: 198 Comm: systemd-udevd Tainted: G O 6.6.25-rt29-g8c8864ffb5db #1
[ 8.052859] Hardware name: NXP S32G3 Reference Design Board (S32G-VNP-RDB3) (DT)
[ 8.052864] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 8.052871] pc : ftrace_call_adjust+0x64/0x70
[ 8.052878] lr : ftrace_call_adjust+0x64/0x70
[ 8.052884] sp : ffffffc081d9ba80
[ 8.052887] x29: ffffffc081d9ba80 x28: 00000000000000ad x27: 0000000000001000
[ 8.052898] x26: ffffff8800ffb240 x25: ffffffc079445f00 x24: ffffffc079443010
[ 8.052908] x23: ffffff8800ffb240 x22: 0000000000000000 x21: ffffffc0813b7898
[ 8.052920] x20: 0000000000000000 x19: ffffffc0793f59ec x18: ffffffc081debd58
[ 8.052930] x17: 0000000000000000 x16: ffffffc080bf7d88 x15: 0000007f9e1f7fff
[ 8.052940] x14: 0000000000000000 x13: ffffffc080d83580 x12: ffffffc081258718
[ 8.052950] x11: 0000000000000001 x10: 0000000000000920 x9 : ffffffc0800840b0
[ 8.052959] x8 : ffffff8803922480 x7 : 0000000000000004 x6 : 00000000000000d0
[ 8.052969] x5 : 00000000410fd030 x4 : 0000000000f0000f x3 : 0000000000000004
[ 8.052980] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff8803921b00
[ 8.052990] Call trace:
[ 8.052994] ftrace_call_adjust+0x64/0x70
[ 8.053001] ftrace_process_locs+0x22c/0x400
[ 8.053011] ftrace_module_init+0x44/0x70
[ 8.053018] load_module+0x1404/0x1c70
[ 8.053027] init_module_from_file+0x90/0xe0
[ 8.053035] __arm64_sys_finit_module+0x1c8/0x298
[ 8.053042] invoke_syscall+0x50/0x128
[ 8.053052] el0_svc_common.constprop.0+0xd0/0xf8
[ 8.053061] do_el0_svc+0x28/0x40
[ 8.053069] el0_svc+0x40/0xf8
[ 8.053079] el0t_64_sync_handler+0x13c/0x158
[ 8.053088] el0t_64_sync+0x190/0x198
[ 8.053096] ---[ end trace 0000000000000000 ]---
[ 8.224811] ------------[ cut here ]------------

The whole log is attached.

The reason seems that the pfe is an out of tree modue. I am working to find the root reason. 

Would you please help to confirm the issue and give a workaroud?

Thanks,

Zhantao

[chenyin_h]

Hi, @hittzt

Thanks for your reply.

I will always check the internal progress and update you the status.

If any further questions/requests from your side, would you mind creating new posts regarding to this issue? Since if the posts last too long, there may not be in time notice to remind me.

Sorry for your inconvenience.

BR
Chenyin

[chenyin_h]

Hi, @hittzt 

Thanks for the reply and sorry for the waiting.

The status is listed for your reference:

1. I have provided my test log to internal team, the colleague from internal teams also reproduced the issue

2. Internal team has put it to the issue list, with engineer assigned.

3. I usually checked the status in one-two days , but there seems no obvious progress.

From my experience, it may be processed in the next 1-2 BSP release.

Sorry for your inconvenience.

BR

Chenyin

[hittzt]

Hi @chenyin_h,

Thanks for your kindly reply.

Then I will update my local status for this issue.

Thanks,

Zhantao

[chenyin_h]

Thanks for your reminding. I have reproduced the issues when enabled the PFE.

Seems it is triggered when loading PFE driver, may I know if you had seen any similar prints when loading other kind of out-of-tree modules?

By the way, I did not see similar issue on BSP41 with kernel 5.15.x.

Best Regards

Chenyin

[hittzt]

Hi @chenyin_h,

Is there any update for this issue?

Thanks,

Zhantao

[hittzt]

Hi @chenyin_h ,

No, I did not see similar issue with other driver, like ipc-shm.

It seems the 6.6 kernel update codes related with the out of tree module.

But the root reason is still not clear.

Thanks,

Zhantao

[chenyin_h]

Hi， @hittzt 

Thanks for your findings.

Sorry that I have not reproduced the issue locally on a RDB3 with BSP41, the log is attached for your reference, if anything missed from the test settings, feel free to contact me.

Best Regards

Chenyin

[hittzt]

Hi @chenyin_h ,

Thanks for your reply.

The pfe is enabled in your project, right? Would you please check the the pfe driver probing log and share the whole dmesg?

Thanks,

Zhantao