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Date:   Wed, 13 Sep 2023 13:34:36 +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: linux-next: boot warning from the bpf-next tree
Message-ID: <20230913133436.0eeec4cb@canb.auug.org.au>
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Hi all,

Today's linux-next boot tests (powerpc pseries_le_defconfig) produced
this warning:

 ------------[ 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+0x4=
10/0x440
 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 0xf000=
004 of:SLOF,HEAD pSeries
 NIP:  c0000000003c0890 LR: c0000000003c088c CTR: 0000000000000000
 REGS: c000000004783890 TRAP: 0700   Not tainted  (6.6.0-rc1-04964-g2e08ed1=
d459f)
 MSR:  8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 24000280  XER: 0000=
0000
 CFAR: c00000000014cfa0 IRQMASK: 0=20
 GPR00: c0000000003c088c c000000004783b30 c000000001578c00 0000000000000036=
=20
 GPR04: 0000000000000000 c000000002667e18 0000000000000001 0000000000000000=
=20
 GPR08: c000000002667ce0 0000000000000001 0000000000000000 0000000044000280=
=20
 GPR12: 0000000000000000 c000000002b00000 c000000000011188 0000000000000060=
=20
 GPR16: c0000000011f9a30 c000000002920f68 c0000000021fac40 c0000000021fac40=
=20
 GPR20: c000000002a3ed88 c000000002921560 c0000000014867f0 c00000000291ccd8=
=20
 GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000010=
=20
 GPR28: c0000000011f9a30 0000000000000000 000000000000000b c00000007fc9ac40=
=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 (unre=
liable)
 [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+0x14/0x1c
 --- interrupt: 0 at 0x0
 NIP:  0000000000000000 LR: 0000000000000000 CTR: 0000000000000000
 REGS: c000000004783e80 TRAP: 0000   Not tainted  (6.6.0-rc1-04964-g2e08ed1=
d459f)
 MSR:  0000000000000000 <>  CR: 00000000  XER: 00000000
 CFAR: 0000000000000000 IRQMASK: 0=20
 GPR00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 GPR12: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 GPR28: 0000000000000000 0000000000000000 0000000000000000 0000000000000000=
=20
 NIP [0000000000000000] 0x0
 LR [0000000000000000] 0x0
 --- interrupt: 0
 Code: 3b000000 4bfffcbc 78650020 3c62ffe7 39200001 3d420130 7cc607b4 7ba40=
020 386382f0 992a1e24 4bd8c631 60000000 <0fe00000> 4bffff40 ea410080 3860ff=
f4=20
 ---[ end trace 0000000000000000 ]---

Presumably related to commit

  41a5db8d8161 ("bpf: Add support for non-fix-size percpu mem allocation")

(or other commist in that series) from the bpf-next tree.

--=20
Cheers,
Stephen Rothwell

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