Re: linux-next: runtime warnings after merge of the bpf-next tree

From: Alexei Starovoitov
Date: Wed Jan 31 2024 - 22:55:42 EST

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On Wed, Jan 31, 2024 at 7:23 PM Stephen Rothwell <sfr@xxxxxxxxx.orgau> wrote:
>
> Hi all,
>
> After merging the bpf-next tree, today's linux-next build (powerpc
> pseries_le_defconfig) produced these runtime warnings in my qemu boot
> tests:

le - little endian?

Do you see this on other architectures or powerpr_le only?

Daniel,

any ideas?

>
> ipip: IPv4 and MPLS over IPv4 tunneling driver
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c00000000209ba3c CTR: c00000000209b9a4
> REGS: c0000000049bf960 TRAP: 0700 Not tainted (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000482 XER: 00000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c00000000209ba3c c0000000049bfc00 c0000000015c9900 000000000000001b
> GPR04: c0000000012bc980 000000000000019a 000000000000019a 0000000000000133
> GPR08: c000000002969900 0000000000000001 c000000002969900 c000000002969900
> GPR12: c00000000209b9a4 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1060
> GPR28: 0000000000000000 0000000000000007 c0000000020c10a8 c000000002968f80
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c00000000209ba3c] cubictcp_register+0x98/0xc8
> Call Trace:
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> NET: Registered PF_INET6 protocol family
> .
> .
> .
> Running code patching self-tests ...
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c00000000204900c CTR: c000000002048fe0
> REGS: c0000000049bf970 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000482 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c00000000204900c c0000000049bfc10 c0000000015c9900 000000000000001a
> GPR04: c000000001218fb0 0000000000000002 c0000000049bfc02 0000000035b5793c
> GPR08: 0000000000000000 0000000000000001 0000000000000000 000000009e3fcb99
> GPR12: c000000002048fe0 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c000000002048fe0
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c00000000204900c] bpf_rstat_kfunc_init+0x2c/0x40
> Call Trace:
> [c0000000049bfc10] [c0000000020c10b0] 0xc0000000020c10b0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> registered taskstats version 1
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c000000002050fdc CTR: c000000002050fb8
> REGS: c0000000049bf970 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000482 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c000000002050fdc c0000000049bfc10 c0000000015c9900 000000000000001d
> GPR04: c000000001223600 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000024000242
> GPR12: c000000002050fb8 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c000000002050fb8
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c000000002050fdc] bpf_fs_kfuncs_init+0x24/0x38
> Call Trace:
> [c0000000049bfc10] [c0000000020c10b0] 0xc0000000020c10b0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c000000002050fa4 CTR: c000000002050f80
> REGS: c0000000049bf970 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000482 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c000000002050fa4 c0000000049bfc10 c0000000015c9900 000000000000001a
> GPR04: c0000000012235e8 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000024000242
> GPR12: c000000002050f80 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c000000002050f80
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c000000002050fa4] bpf_key_sig_kfuncs_init+0x24/0x38
> Call Trace:
> [c0000000049bfc10] [c0000000020c10b0] 0xc0000000020c10b0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c0000000020517dc CTR: c000000002051790
> REGS: c0000000049bf940 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000422 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c0000000020517dc c0000000049bfbe0 c0000000015c9900 000000000000001a
> GPR04: c000000001227670 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000024000282
> GPR12: c000000002051790 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c000000001227670
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c0000000020517dc] kfunc_init+0x4c/0x110
> Call Trace:
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c0000000003976c8 CTR: c00000000039769c
> REGS: c0000000049bf970 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000422 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c0000000003976c8 c0000000049bfc10 c0000000015c9900 0000000000000000
> GPR04: c000000001228d70 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000024000282
> GPR12: c00000000039769c c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c00000000039769c
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c0000000003976c8] init_subsystem+0x2c/0x40
> Call Trace:
> [c0000000049bfc10] [c0000000020c10b0] 0xc0000000020c10b0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c000000002051ed8 CTR: 0000000000000000
> REGS: c0000000049bf950 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000220 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c000000002051ed8 c0000000049bfbf0 c0000000015c9900 000000000000001a
> GPR04: c00000000122ad08 0000000000000001 c000000004810c00 c00000007fc92c30
> GPR08: 0000000000000017 0000000000000001 0000000000000008 0000000024000222
> GPR12: 0000000000000034 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c00000000122ad08
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c000000002051ed8] cpumask_kfunc_init+0x98/0xf0
> Call Trace:
> [c0000000049bfbf0] [c000000002051e84] cpumask_kfunc_init+0x44/0xf0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> Loading compiled-in X.509 certificates
> .
> .
> .
> netconsole: network logging started
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c000000000f0099c CTR: c000000000f00970
> REGS: c0000000049bf970 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000282 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c000000000f0099c c0000000049bfc10 c0000000015c9900 000000000000001a
> GPR04: c0000000012b12c0 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000000000000
> GPR12: c000000000f00970 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c000000000f00970
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c000000000f0099c] init_subsystem+0x2c/0x40
> Call Trace:
> [c0000000049bfc10] [c0000000020c10b0] 0xc0000000020c10b0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c000000002094ab0 CTR: c000000002094a70
> REGS: c0000000049bf960 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000282 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c000000002094ab0 c0000000049bfc00 c0000000015c9900 0000000000000003
> GPR04: c0000000012b1260 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000000000000
> GPR12: c000000002094a70 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000012aef20 c0000000012b1260
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c000000002094ab0] bpf_kfunc_init+0x40/0x18c
> Call Trace:
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c000000002094ccc CTR: c000000002094ca0
> REGS: c0000000049bf970 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000282 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c000000002094ccc c0000000049bfc10 c0000000015c9900 0000000000000006
> GPR04: c0000000012b25e0 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000000000000
> GPR12: c000000002094ca0 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c000000002094ca0
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c000000002094ccc] xdp_metadata_init+0x2c/0x40
> Call Trace:
> [c0000000049bfc10] [c0000000020c10b0] 0xc0000000020c10b0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c000000002095890 CTR: c000000002095800
> REGS: c0000000049bf940 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000282 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c000000002095890 c0000000049bfbe0 c0000000015c9900 0000000000000003
> GPR04: c0000000012b5938 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000000000000
> GPR12: c000000002095800 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c0000000012b5938
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c000000002095890] bpf_prog_test_run_init+0x90/0xec
> Call Trace:
> [c0000000049bfbe0] [c000000002095848] bpf_prog_test_run_init+0x48/0xec (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> modprobe (54) used greatest stack depth: 28336 bytes left
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at kernel/bpf/btf.c:8131 register_btf_kfunc_id_set+0x68/0x74
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.8.0-rc2-03380-gd0c0d80c1162 #2
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP: c0000000003bfbfc LR: c00000000209bd0c CTR: c00000000209bce0
> REGS: c0000000049bf970 TRAP: 0700 Tainted: G W (6.8.0-rc2-03380-gd0c0d80c1162)
> MSR: 800000000282b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 24000242 XER: 20000000
> CFAR: c0000000003bfbb0 IRQMASK: 0
> GPR00: c00000000209bd0c c0000000049bfc10 c0000000015c9900 000000000000001b
> GPR04: c0000000012bcb28 0000000000000002 c0000000049bfc02 fffffffffffe0000
> GPR08: 0000000000000000 0000000000000001 0000000000000000 c00000000291fb90
> GPR12: c00000000209bce0 c000000002b60000 c0000000000110cc 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000014cd250
> GPR24: c000000002003e6c c000000001582c78 000000000000018b c0000000020c1068
> GPR28: 0000000000000000 0000000000000008 c0000000020c10b0 c00000000209bce0
> NIP [c0000000003bfbfc] register_btf_kfunc_id_set+0x68/0x74
> LR [c00000000209bd0c] bpf_tcp_ca_kfunc_init+0x2c/0x74
> Call Trace:
> [c0000000049bfc10] [c0000000020c10b0] 0xc0000000020c10b0 (unreliable)
> [c0000000049bfc30] [c000000000010d58] do_one_initcall+0x80/0x2f8
> [c0000000049bfd00] [c000000002005aec] kernel_init_freeable+0x32c/0x520
> [c0000000049bfde0] [c0000000000110f8] kernel_init+0x34/0x25c
> [c0000000049bfe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
> --- interrupt: 0 at 0x0
> Code: 60420000 3d22ffc6 39290708 7d291a14 89290270 7d290774 79230020 4bfff8c0 60420000 e9240000 7d290074 7929d182 <0b090000> 3860ffea 4e800020 3c4c0121
> ---[ end trace 0000000000000000 ]---
> Freeing unused kernel image (initmem) memory: 6464K
>
> Exposed (and maybe caused) by commit
>
> 6e7769e6419f ("bpf: treewide: Annotate BPF kfuncs in BTF")
>
> --
> Cheers,
> Stephen Rothwell

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