Interesting, pax-utils-v1.2.5 on Arch Linux 5.10.9-arch1-1: > pspax USER PID PAX MAPS ETYPE NAME CAPS ATTR [1] 3209832

Interesting, pax-utils-v1.2.5 on Arch Linux 5.10.9-arch1-1: > pspax USER PID PAX MAPS ETYPE NAME CAPS ATTR [1] 3209832 invalid system call (core dumped) pspax Stack trace of thread 3209832: #0 0x00007fbdb92d89ab __socket (libc.so.6 + 0x1019ab) #1 0x00007fbdb930dce0 open_socket (libc.so.6 + 0x136ce0) #2 0x00007fbdb930e1de __nscd_get_mapping (libc.so.6 + 0x1371de) #3 0x00007fbdb930e62f __nscd_get_map_ref (libc.so.6 + 0x13762f) #4 0x00007fbdb930ac47 nscd_getpw_r (libc.so.6 + 0x133c47) #5 0x00007fbdb930b0b6 __nscd_getpwuid_r (libc.so.6 + 0x1340b6) #6 0x00007fbdb92a3895 getpwuid_r@@GLIBC_2.2.5 (libc.so.6 + 0xcc895) #7 0x00007fbdb92a2eeb getpwuid (libc.so.6 + 0xcbeeb) #8 0x0000558995732566 n/a (pspax + 0x4566) #9 0x00007fbdb91ff152 __libc_start_main (libc.so.6 + 0x28152) #10 0x0000558995732e8e n/a (pspax + 0x4e8e) Dump of assembler code for function socket: 0x00007fb1d04139a0 <+0>: endbr64 0x00007fb1d04139a4 <+4>: mov $0x29,%eax 0x00007fb1d04139a9 <+9>: syscall => 0x00007fb1d04139ab <+11>: cmp $0xfffffffffffff001,%rax 0x00007fb1d04139b1 <+17>: jae 0x7fb1d04139b4 <socket+20> 0x00007fb1d04139b3 <+19>: ret 0x00007fb1d04139b4 <+20>: mov 0xc0495(%rip),%rcx # 0x7fb1d04d3e50 This can be a system library incompatibility though as don't have all system packages up-to-date. The code compiled from https://github.com/gentoo/pax-utils https://github.com/gentoo/pax-utils runs but displays just = under CAPS for every process. So I am not sure it is generally usable outside of Gentoo (yet).