linux-kernel - Re: bpf selftest failed in 5.4.210 kernel

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Date:   Thu, 18 Aug 2022 07:24:03 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     RAJESH DASARI <raajeshdasari@...il.com>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        jean-philippe@...aro.org, df@...gle.com
Subject: Re: bpf selftest failed in 5.4.210 kernel

On Wed, Aug 17, 2022 at 09:22:00PM +0300, RAJESH DASARI wrote:
> Hi ,
> 
> We are running bpf selftests on 5.4.210 kernel version and we see that
> test case 11 of  test_align failed. Please find the below error.
> 
> selftests: bpf: test_align
> Test  11: pointer variable subtraction ... Failed to find match 16:
> R5_w=pkt(id=2,off=0,r=0,umin_value=2,umax_value=1082,var_off=(0x2;
> 0xfffffffc)
> # func#0 @0
> # 0: R1=ctx(id=0,off=0,imm=0) R10=fp0
> # 0: (61) r2 = *(u32 *)(r1 +76)
> # 1: R1=ctx(id=0,off=0,imm=0) R2_w=pkt(id=0,off=0,r=0,imm=0) R10=fp0
> # 1: (61) r3 = *(u32 *)(r1 +80)
> 
> For complete errors please see the attached file. The same test case
> execution was successful in the 5.4.209 version , could you please let
> me know any known issue with the recent changes in 5.4.210 and how to
> fix these errors.

Can you use 'git bisect' to find the offending commit?

thanks,

greg k-h