Bug 206527 - Kernel 5.6-rc1 w. CONFIG_VMAP_STACK=y + CONFIG_KASAN=y fails to boot on a PowerMac G4 3,6
Summary: Kernel 5.6-rc1 w. CONFIG_VMAP_STACK=y + CONFIG_KASAN=y fails to boot on a Pow...
Status: RESOLVED CODE_FIX
Alias: None
Product: Platform Specific/Hardware
Classification: Unclassified
Component: PPC-32 (show other bugs)
Hardware: PPC-32 Linux
: P1 normal
Assignee: platform_ppc-32
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-02-13 20:40 UTC by Erhard F.
Modified: 2020-02-26 15:33 UTC (History)
1 user (show)

See Also:
Kernel Version: 5.6.0-rc1
Subsystem:
Regression: No
Bisected commit-id:

Attachments
screenshot of stuck boot process (2.27 MB, image/jpeg)
2020-02-13 20:40 UTC, Erhard F. 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Erhard F. 2020-02-13 20:40:31 UTC 
Created attachment 287361 [details]
screenshot of stuck boot process

Happens on my G4 DP with kernel 5.6.0-rc1 and KASAN (outline) enabled + CONFIG_VMAP_STACK enabled. kernel is patched with Christophe's '[v2] powerpc/32s: Fix DSI and ISI exceptions for CONFIG_VMAP_STACK' (https://patchwork.ozlabs.org/patch/1237387/)

The kernel loads but booting gets stuck at a stage where the display is initialized but before kernel dmesg gets show (see screenshot).

The machine boots with either CONFIG_VMAP_STACK=y or CONFIG_KASAN=y enabled but not with both of them enabled together.
Comment 1 Christophe Leroy 2020-02-14 09:55:16 UTC 
Can you test v3, https://patchwork.ozlabs.org/patch/1237954/
Comment 2 Erhard F. 2020-02-14 13:06:41 UTC 
Excellent, with v3 KASAN (outline + inline) now work together with CONFIG_VMAP_STACK=y!
Comment 3 Erhard F. 2020-02-26 15:33:39 UTC 
Fix landed in 5.6-rc3, works now as expected. Thanks!
Note You need to log in before you can comment on or make changes to this bug.