Greeting, FYI, we noticed the following commit (built with gcc-9): commit: d7ada758319742a3b15264520df6a991e01cc294 ("signal: Add SA_IMMUTABLE to ensure forced siganls do not get changed") https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git exit-cleanups-for-v5.16 in testcase: kernel-selftests version: kernel-selftests-x86_64-c8c9111a-1_20210929 with following parameters: group: x86 test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url: https://www.kernel.org/doc/Documentation/kselftest.txt on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; TAP version 13 1..39 # selftests: x86: single_step_syscall_32 # [RUN] Set TF and check nop # [OK] Survived with TF set and 15 traps # [RUN] Set TF and check int80 # [OK] Survived with TF set and 14 traps # [RUN] Set TF and check a fast syscall # [OK] Survived with TF set and 45 traps # [RUN] Fast syscall with TF cleared # single_step_syscall_32: sigaction: Invalid argument # [OK] Nothing unexpected happened # [RUN] Set TF and check SYSENTER # Got SIGSEGV with RIP=f7f5e549, TF=256 not ok 1 selftests: x86: single_step_syscall_32 # exit=1 # selftests: x86: sigreturn_32 # sigreturn_32: sigaction: Invalid argument # [OK] set_thread_area refused 16-bit data # [OK] set_thread_area refused 16-bit data # [RUN] Valid sigreturn: 64-bit CS (33), 32-bit SS (2b, GDT) # [OK] all registers okay # [RUN] Valid sigreturn: 32-bit CS (23), 32-bit SS (2b, GDT) # [OK] all registers okay # [RUN] Valid sigreturn: 16-bit CS (37), 32-bit SS (2b, GDT) # [OK] all registers okay # [RUN] Valid sigreturn: 64-bit CS (33), 16-bit SS (3f) # [OK] all registers okay # [RUN] Valid sigreturn: 32-bit CS (23), 16-bit SS (3f) # [OK] all registers okay # [RUN] Valid sigreturn: 16-bit CS (37), 16-bit SS (3f) # [OK] all registers okay not ok 6 selftests: x86: sigreturn_32 # exit=1 # selftests: x86: sigaltstack_32 # sigaltstack_32: sigaction: Invalid argument # [RUN] Test an alternate signal stack of sufficient size. # Raise SIGALRM. It is expected to be delivered. # [OK] SIGALRM signal delivered. not ok 12 selftests: x86: sigaltstack_32 # exit=1 # selftests: x86: single_step_syscall_64 # [RUN] Set TF and check nop # [OK] Survived with TF set and 10 traps # [RUN] Set TF and check syscall-less opportunistic sysret # [OK] Survived with TF set and 12 traps # [RUN] Set TF and check int80 # [OK] Survived with TF set and 9 traps # [RUN] Set TF and check a fast syscall # [OK] Survived with TF set and 22 traps # [RUN] Fast syscall with TF cleared # single_step_syscall_64: sigaction: Invalid argument # [OK] Nothing unexpected happened # [RUN] Set TF and check SYSENTER # Got SIGSEGV with RIP=5bbf0549, TF=256 not ok 22 selftests: x86: single_step_syscall_64 # exit=1 # selftests: x86: sigreturn_64 # sigreturn_64: sigaction: Invalid argument # [OK] set_thread_area refused 16-bit data # [OK] set_thread_area refused 16-bit data # [RUN] Valid sigreturn: 64-bit CS (33), 32-bit SS (2b, GDT) # [OK] all registers okay # [RUN] Valid sigreturn: 32-bit CS (23), 32-bit SS (2b, GDT) # [NOTE] SP: 8badf00d5aadc0de -> 5aadc0de # [OK] all registers okay # [RUN] Valid sigreturn: 16-bit CS (37), 32-bit SS (2b, GDT) # [NOTE] SP: 8badf00d5aadc0de -> 5aadc0de # [OK] all registers okay # [RUN] Valid sigreturn: 64-bit CS (33), 16-bit SS (3f) # [OK] all registers okay # [RUN] Valid sigreturn: 32-bit CS (23), 16-bit SS (3f) # [NOTE] SP: 8badf00d5aadc0de -> 5aadc0de # [OK] all registers okay # [RUN] Valid sigreturn: 16-bit CS (37), 16-bit SS (3f) # [NOTE] SP: 8badf00d5aadc0de -> 5aadc0de # [OK] all registers okay # [RUN] Valid sigreturn: 32-bit CS (23), 32-bit SS (2b, GDT) # Corrupting SS on return to 64-bit mode # [NOTE] SP: 8badf00d5aadc0de -> 5aadc0de # [OK] all registers okay # [RUN] Valid sigreturn: 32-bit CS (23), 16-bit SS (3f) # Corrupting SS on return to 64-bit mode # [NOTE] SP: 8badf00d5aadc0de -> 5aadc0de # [OK] all registers okay not ok 27 selftests: x86: sigreturn_64 # exit=1 # selftests: x86: sigaltstack_64 # sigaltstack_64: sigaction: Invalid argument # [RUN] Test an alternate signal stack of sufficient size. # Raise SIGALRM. It is expected to be delivered. # [OK] SIGALRM signal delivered. not ok 33 selftests: x86: sigaltstack_64 # exit=1 To reproduce: # build kernel cd linux cp config-5.15.0-rc1-00022-gd7ada7583197 .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email # if come across any failure that blocks the test, # please remove ~/.lkp and /lkp dir to run from a clean state. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang