New: segmentation fault in busybox/glibc due to CONFIG_STACK_OPTIMIZATION_386
https://bugs.busybox.net/show_bug.cgi?id=15491
Bug ID: 15491
Summary: segmentation fault in busybox/glibc due to
CONFIG_STACK_OPTIMIZATION_386
Product: buildroot
Version: 2023.02
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: Other
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]Target Milestone: ---
Hi,
i was facing the issue that busybox (ls appled) was generating a random segmentation fault in libc/ctime() (i386 platform, glibc 2.30). The actual problem was that CONFIG_STACK_OPTIMIZATION_386 was set by default, causing an 8 byte aligned stack, and glibc uses a movaps instruction on it (which requires 16 byte alignment).
Obviously i could solve this by disabling CONFIG_STACK_OPTIMIZATION_386, but it took me quite a while to find it out.
This really should be disabled by default. After some digging it seems that the ABI nowadays mandates 16 byte stack alignment even for i386 (see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38496).
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[Buildroot] [Bug 15491] segmentation fault in busybox/glibc due to CONFIG_STACK_OPTIMIZATION_386
https://bugs.busybox.net/show_bug.cgi?id=15491
Felix Schmidt <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Host| |Embedded Atom CE2752
Build| |Linux x86
Target| |i686-buildroot-linux-gnuSignature · 6 lines
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[Buildroot] [Bug 15491] segmentation fault in busybox/glibc due to CONFIG_STACK_OPTIMIZATION_386
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=15491
--- Comment #1 from Thomas Petazzoni <[email protected]> --- See also this patch and the discussion:
https://patchwork.ozlabs.org/project/buildroot/patch/[email protected]/
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[Buildroot] [Bug 15491] segmentation fault in busybox/glibc due to CONFIG_STACK_OPTIMIZATION_386
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=15491
Yann E. MORIN <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected] Status|NEW |RESOLVED Resolution|--- |MOVED
--- Comment #2 from Yann E. MORIN <[email protected]> --- Thank you for your report.
The issue tracker for the Buildroot project has been moved to the Gitlab.com issue tracker:
https://gitlab.com/buildroot.org/buildroot/-/issues
We are taking this opportunity to close old issues in this old tracker. If you believe your issue is still relevant, please open one in the new issue tracker.
Thank you!
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