Re: 6.1.48 regression at boot : WARNING: CPU: 0 PID: 0 at arch/x86/kernel/alternative.c:572 apply_returns+0x1e4/0x210

[Bagas Sanjaya]

On Sat, Aug 26, 2023 at 03:47:13PM +0200, Toralf Förster wrote:
> 
> I do get a
> 
> missing return thunk: 0xffffffff948a73fe-srso_untrain_ret+0x0/0x2: e9 7b 92
> 35 ff
> WARNING: CPU: 0 PID: 0 at arch/x86/kernel/alternative.c:572
> apply_returns+0x1e4/0x210
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper/0 Tainted: G                T  6.1.48 #38

Do you have any external modules?

> Hardware name: LENOVO 21J5002FGE/21J5002FGE, BIOS R23ET60W (1.30 )
> 09/14/2022
> RIP: 0010:apply_returns+0x1e4/0x210
> Code: 36 01 00 0f 85 f7 fe ff ff 49 89 d8 b9 05 00 00 00 4c 89 f2 48 89 de
> 48 c7 c7 e8 7e ff 93 c6 05 22 7d 36 01 01 e8 8c a9 09 00 <0f> 0b e9 cf fe ff
> ff c7 84 24 81 00 00 00 cc cc cc cc 42 c7 44 38
> RSP: 0000:ffffffff94203e00 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffffffff948a73fe RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffffffff9488601c R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff948866e8
> R13: cccccccccccccccc R14: ffffffff93c0067e R15: ffffffff94219118
> FS:  0000000000000000(0000) GS:ffff97dcdee00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff97d6f4c01000 CR3: 0000000234210000 CR4: 0000000000750ef0
> PKRU: 55555554
> Call Trace:
>  <TASK>
>  ? __warn+0x6f/0xc0
>  ? apply_returns+0x1e4/0x210
>  ? report_bug+0xdb/0x140
>  ? handle_bug+0x3c/0x70
>  ? exc_invalid_op+0x17/0x80
>  ? asm_exc_invalid_op+0x1a/0x20
>  ? retbleed_return_thunk+0x7e/0x7e
>  ? apply_returns+0x1e4/0x210
>  ? _raw_spin_unlock_irqrestore+0xd/0x30
>  alternative_instructions+0x68/0x1e1
>  arch_cpu_finalize_init+0x48/0x9a
>  start_kernel+0x789/0x877
>  secondary_startup_64_no_verify+0xd3/0xdb
>  </TASK>
> ---[ end trace 0000000000000000 ]---
> 
> here at a
> 
> Linux p14s 6.1.48 #38 SMP Sat Aug 26 15:41:04 CEST 2023 x86_64 AMD Ryzen 7
> PRO 6850U with Radeon Graphics AuthenticAMD GNU/Linux
> 
> Otherwise the kernel seems to work fine.

Can you confirm that v6.1.47 doesn't have this regression? Is it also
reproducible on latest mainline?

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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