** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Status: New => In Progress
** Changed in: ubuntu-z-systems
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1765083
Title:
Please cherrypick s390 unwind fix
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
In Progress
Bug description:
SRU Justification
Impact: On s390, an incorrect pointer being copied from the kernel to
userspace breaks stack unwinding.
Fix: One-line change from upstream. Only needed for 4.15+.
Test Case: The glibc testsuite contains test cases, which currently
fail with 4.15.
Regression Potential: Minimal as this is a small, obvious bug fix for
a single architecture.
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As pointed out in the glibc bug[1], there's a kernel bug preventing
unwinding due to an incorrect pointer being copied to userspace. A
1-line patch[2] has been committed to Linus's tree to fix this.
I investigated, and this only affects 4.15, so we only need this
applied to bionic.
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=22916
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8b09ca746a643ca452cd41a522046a96ee5a55fd
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