i#5365 AArch64 tests: rseq tests failing on CentOS 9 #7790
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glibc 2.35+ (and 2.34+ for RHEL/CentOS and possibly other OSes that
backported the feature) make use of the rseq syscall which interferes
with DynamoRIO's rseq tests.
The rseq syscall in the rseq tests was always failing with errno set to
EINVAL because glibc had already registered its own rseq structure and
only one registration is allowed per thread.
We can fix this by explicitly turning off glibc's rseq registration by
for the effected tests by setting the environment variable:
GLIBC_TUNABLES=glibc.pthread.rseq=0
Also fix the CMakeLists.txt function set_properties() which was
erroneously adding the test prefix to the environment variable.
Issue: #5365
derekbruening
approved these changes
Jan 29, 2026
philramsey-arm
changed the title
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glibc 2.35+ (and 2.34+ for RHEL/CentOS and possibly other OSes that backported the feature) make use of the rseq syscall which interferes with DynamoRIO's rseq tests.
The rseq syscall in the rseq tests was always failing with errno set to EINVAL because glibc had already registered its own rseq structure and only one registration is allowed per thread.
We can fix this by explicitly turning off glibc's rseq registration for the effected tests by setting the environment variable: "GLIBC_TUNABLES=glibc.pthread.rseq=0".
Also fix the CMakeLists.txt function set_properties() which was erroneously adding the test prefix to the environment variable.
Issue: #5365
Co-authored-by: Jack Gallagher [email protected]