Re: [PATCH] qemui386-buster: Switch to linux-image intended for older PCs

[Henning Schild <henning.schild@siemens.com>]

Am Mon, 1 Apr 2019 16:56:12 +0200
schrieb "Maxim Yu. Osipov" <mosipov@ilbers.de>:

> linux-image with suffix 686-pae frequently experiences
> problems during boot:
> 
> [   30.458173] ------------[ cut here ]------------
> [   30.458649] kernel BUG at arch/x86/kernel/alternative.c:726!
> [   30.459483] invalid opcode: 0000 [#1] SMP PTI
> [   30.459960] CPU: 0 PID: 176 Comm: systemd-udevd Tainted:
> G           OE     4.19.0-4-686-pae #1 Debian 4.19.28-2
> [   30.460749] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.10.2-1 04/01/2014 [   30.461571] EIP: text_poke+0x1bc/0x250
> [   30.461932] Code: 0f b6 07 38 01 75 23 8b 55 e8 8d 47 01 8d 34 1f
> 83 c2 01 8d 76 00 39 f0 74 14 0f b6 18 0f b6 0a 83 c0 01 83 c2 01 38
> cb 74 ec <0f> 0b 66 90 8b 45 dc 50 9d 8d 74 26 00 8d 65 f4 89 f8 5b
> 5e 5f 5d [   30.463339] EAX: 000000f0 EBX: 00000001 ECX: f642be1b
> EDX: ffd30000 [   30.463828] ESI: d0060b90 EDI: f7c00350 EBP:
> f642be00 ESP: f642bddc [   30.464328] DS: 007b ES: 007b FS: 00d8 GS:
> 00e0 SS: 0068 EFLAGS: 00200007 [   30.464864] CR0: 80050033 CR2:
> f9a00000 CR3: 3642c000 CR4: 000006b0 [   30.465453] Call Trace:
> [   30.466264]  alternatives_smp_module_add+0x141/0x150
> [   30.466768]  module_finalize+0x137/0x160 [   30.467134]
> load_module+0x1a47/0x1e90 [   30.467472]  ?
> kernel_read_file+0x1e7/0x220 [   30.467844]
> sys_finit_module+0x89/0xe0 [   30.468217]
> do_fast_syscall_32+0x81/0x184 [   30.468573]
> entry_SYSENTER_32+0x6b/0xbe [   30.478343] EIP: 0xb7ef0d71
> [   30.487659] Code: f6 ff ff 55 89 e5 8b 55 08 8b 80 5c cd ff ff 85
> d2 74 02 89 02 5d c3 8b 04 24 c3 8b 1c 24 c3 90 90 51 52 55 89 e5 0f
> 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80
> 90 8d 76 [   30.507802] EAX: ffffffda EBX: 0000000f ECX: b7d00bdd
> EDX: 00000000 [   30.517900] ESI: 00fba390 EDI: 00fba140 EBP:
> 00000000 ESP: bfbf781c [   30.527949] DS: 007b ES: 007b FS: 0000 GS:
> 0033 SS: 007b EFLAGS: 00200292 [   30.538212] Modules linked in:
> bochs_drm ttm drm_kms_helper evdev drm pcspkr serio_raw sg parport_pc
> parport qemu_fw_cfg button example_module(OE) ip_tables x_tables
> autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb
> crypto_simd cryptd aes_i586 sr_mod cdrom sd_mod ata_generic ata_piix
> libata psmouse scsi_mod e1000 i2c_piix4 floppy [   30.571056]
> ---[ end trace c162d77644e01483 ]---

Is that reproducible? Which qemu version are you running that on? This
might be something to forward to qemu/kernel (more likely qemu) instead
of just ignoring that finding.
PAE together with spectre/meltdown mitigations smells ...

Henning

> Switch to other linux-image flavor (intended for older PCs),
> which behaves stable.
> 
> Signed-off-by: Maxim Yu. Osipov <mosipov@ilbers.de>
> ---
>  meta-isar/conf/multiconfig/qemui386-buster.conf | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/meta-isar/conf/multiconfig/qemui386-buster.conf
> b/meta-isar/conf/multiconfig/qemui386-buster.conf index
> 4216d85..6b5a18e 100644 ---
> a/meta-isar/conf/multiconfig/qemui386-buster.conf +++
> b/meta-isar/conf/multiconfig/qemui386-buster.conf @@ -5,7 +5,7 @@
> MACHINE ?= "qemui386" DISTRO ?= "debian-buster"
>  DISTRO_ARCH ?= "i386"
>  
> -KERNEL_NAME ?= "686-pae"
> +KERNEL_NAME ?= "686"
>  
>  IMAGE_TYPE ?= "wic-img"
>  WKS_FILE ?= "directdisk-isar"