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Date:   Wed, 13 Sep 2023 14:59:19 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Daniel Borkmann <daniel@iogearbox.net>,
        Alexei Starovoitov <ast@kernel.org>,
        Andrii Nakryiko <andrii@kernel.org>, bpf <bpf@vger.kernel.org>,
        Networking <netdev@vger.kernel.org>
Cc:     Yonghong Song <yonghong.song@linux.dev>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: Re: linux-next: boot warning from the bpf-next tree
Message-ID: <20230913145919.6060ae61@canb.auug.org.au>
In-Reply-To: <20230913133436.0eeec4cb@canb.auug.org.au>
References: <20230913133436.0eeec4cb@canb.auug.org.au>
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Hi all,

On Wed, 13 Sep 2023 13:34:36 +1000 Stephen Rothwell <sfr@canb.auug.org.au> =
wrote:
>
> Today's linux-next boot tests (powerpc pseries_le_defconfig) produced
> this warning:
>=20
>  ------------[ cut here ]------------
>  bpf_mem_cache[0]: unexpected object size 16, expect 96
>  WARNING: CPU: 0 PID: 1 at kernel/bpf/memalloc.c:500 bpf_mem_alloc_init+0=
x410/0x440
>  Modules linked in:
>  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc1-04964-g2e08ed1d459f =
#1
>  Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf0=
00004 of:SLOF,HEAD pSeries
>  NIP:  c0000000003c0890 LR: c0000000003c088c CTR: 0000000000000000
>  REGS: c000000004783890 TRAP: 0700   Not tainted  (6.6.0-rc1-04964-g2e08e=
d1d459f)
>  MSR:  8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 24000280  XER: 00=
000000
>  CFAR: c00000000014cfa0 IRQMASK: 0=20
>  GPR00: c0000000003c088c c000000004783b30 c000000001578c00 00000000000000=
36=20
>  GPR04: 0000000000000000 c000000002667e18 0000000000000001 00000000000000=
00=20
>  GPR08: c000000002667ce0 0000000000000001 0000000000000000 00000000440002=
80=20
>  GPR12: 0000000000000000 c000000002b00000 c000000000011188 00000000000000=
60=20
>  GPR16: c0000000011f9a30 c000000002920f68 c0000000021fac40 c0000000021fac=
40=20
>  GPR20: c000000002a3ed88 c000000002921560 c0000000014867f0 c00000000291cc=
d8=20
>  GPR24: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
10=20
>  GPR28: c0000000011f9a30 0000000000000000 000000000000000b c00000007fc9ac=
40=20
>  NIP [c0000000003c0890] bpf_mem_alloc_init+0x410/0x440
>  LR [c0000000003c088c] bpf_mem_alloc_init+0x40c/0x440
>  Call Trace:
>  [c000000004783b30] [c0000000003c088c] bpf_mem_alloc_init+0x40c/0x440 (un=
reliable)
>  [c000000004783c20] [c00000000203d0c0] bpf_global_ma_init+0x5c/0x9c
>  [c000000004783c50] [c000000000010bc0] do_one_initcall+0x80/0x300
>  [c000000004783d20] [c000000002004978] kernel_init_freeable+0x30c/0x3b4
>  [c000000004783df0] [c0000000000111b0] kernel_init+0x30/0x1a0
>  [c000000004783e50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0=
x1c
>  --- interrupt: 0 at 0x0
>  NIP:  0000000000000000 LR: 0000000000000000 CTR: 0000000000000000
>  REGS: c000000004783e80 TRAP: 0000   Not tainted  (6.6.0-rc1-04964-g2e08e=
d1d459f)
>  MSR:  0000000000000000 <>  CR: 00000000  XER: 00000000
>  CFAR: 0000000000000000 IRQMASK: 0=20
>  GPR00: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  GPR04: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  GPR08: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  GPR12: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  GPR16: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  GPR20: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  GPR24: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  GPR28: 0000000000000000 0000000000000000 0000000000000000 00000000000000=
00=20
>  NIP [0000000000000000] 0x0
>  LR [0000000000000000] 0x0
>  --- interrupt: 0
>  Code: 3b000000 4bfffcbc 78650020 3c62ffe7 39200001 3d420130 7cc607b4 7ba=
40020 386382f0 992a1e24 4bd8c631 60000000 <0fe00000> 4bffff40 ea410080 3860=
fff4=20
>  ---[ end trace 0000000000000000 ]---
>=20
> Presumably related to commit
>=20
>   41a5db8d8161 ("bpf: Add support for non-fix-size percpu mem allocation")
>=20
> (or other commist in that series) from the bpf-next tree.

Actually it looks like it is some interaction between that commit a
commits in the bpf tree.


--=20
Cheers,
Stephen Rothwell

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