Bug 506890 - Support SIGSTKFLT and SIGSYS on linux
Summary: Support SIGSTKFLT and SIGSYS on linux
Status: RESOLVED FIXED
Alias: None
Product: valgrind
Classification: Developer tools
Component: general (other bugs)
Version First Reported In: 3.25.0
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Julian Seward
URL:
Keywords:
Depends on:
Blocks: 506971
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Reported: 2025-07-10 21:33 UTC by Mark Wielaard
Modified: 2025-07-14 22:26 UTC (History)
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Description Mark Wielaard 2025-07-10 21:33:12 UTC 
The LTP kill11 testcase tries all signals.
SIGSTKFLT defaults to term and is easy to support just add something like the following to default_action in coregrind/m_signals.c

+#     if defined(VKI_SIGSTKFLT)
+      case VKI_SIGSTKFLT: /* term */
+#     endif

SIGSYS is already handled by freebsd and needs some tweaks to calculate_SKSS_from_SCSS and sync_signalhandler
Comment 1 Mark Wielaard 2025-07-11 21:40:22 UTC 
This is also why the LTP waitpid01 testcase fails.
Comment 2 Mark Wielaard 2025-07-14 22:26:44 UTC 
commit 969bccaaca7aab2614def013ac1f37de37fbce86
Author: Mark Wielaard <mark@klomp.org>
Date:   Tue Jul 15 00:00:44 2025 +0200

    Handle SIGSYS and SIGSTKFLT when defined
    
    Both signals were already partially handled. But calculate_SKSS_from_SCSS
    only handled SIGSYS on freebsd. default_action didn't handle SIGSTKFLT.
    And sync_signalhandler didn't expect to have to handle SIGSYS.
    
    This fixes LTP tests kill11 and waitpid01.
    
    https://bugs.kde.org/show_bug.cgi?id=506890