gistfile1.txt

2017-11-15 01:01:21	gchristensen	*braces to ask a painful question* are there any known patches to add back support for the 2.6.32 kernel for glibc 2.26?
2017-11-15 01:02:05	gchristensen	I'm marooned on RHEL 6 and have been using Nix to provide more recent package sets, including a more recent glibc. they upgraded to 2.26 recently, which means I'm now stuck back in time for Nix too.
2017-11-15 01:22:56	azanella	gchristensen, nops, you will need to check which was assumed to be removed with minimum 3.2 and backported
2017-11-15 01:23:38	azanella	from Joseph message from '139ace95756a6' it assumes presence of getcpu (x86_64), recvmmsg (not always through its own syscall, sometimes only through socketcall), sendmmsg (likewise), /proc/$pid/task/$tid/comm, f_flags from statfs, prlimit64.
2017-11-15 01:24:16	azanella	also I added a lot of consolidation implementations that changed slight which syscall was used, it might not be supported on 2.6.32
2017-11-15 01:24:33	gchristensen	I understand
2017-11-15 01:25:02	azanella	it is a matter to adjust to enable 2.6.32 and check which is requires adjustments
2017-11-15 01:25:30	gchristensen	yeah, I'm pretty sure that'll be more than I can handle, especially if it was deemed worth dropping support officially
2017-11-15 01:26:06	gchristensen	just unfortunate for some minor use cases like mine, but I can appreciate how much burden old software like this places on projects
2017-11-15 01:26:50	gchristensen	thank you for the information, azanella 
2017-11-15 01:26:54	azanella	yw
2017-11-15 01:27:42	azanella	gchristensen, it thinks it is doable, although it would require some work and the work is mostly 'reverting' stuff
2017-11-15 01:28:45	gchristensen	ok, I'll keep that in mind
2017-11-15 01:29:06	gchristensen	I'm going to first try the angle of let's upgrade to a kernel from this decade 

Current syscall list, from http://vault.centos.org/6.9/os/Source/SPackages/kernel-2.6.32-696.el6.src.rpm :

``` ENTRY(sys_call_table) .long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */ .long sys_exit .long ptregs_fork .long sys_read .long sys_write .long sys_open /* 5 */ .long sys_close .long sys_waitpid .long sys_creat .long sys_link .long sys_unlink /* 10 */ .long ptregs_execve .long sys_chdir .long sys_time .long sys_mknod .long sys_chmod /* 15 */ .long sys_lchown16 .long sys_ni_syscall /* old break syscall holder */ .long sys_stat .long sys_lseek .long sys_getpid /* 20 */ .long sys_mount .long sys_oldumount .long sys_setuid16 .long sys_getuid16 .long sys_stime /* 25 */ .long sys_ptrace .long sys_alarm .long sys_fstat .long sys_pause .long sys_utime /* 30 */ .long sys_ni_syscall /* old stty syscall holder */ .long sys_ni_syscall /* old gtty syscall holder */ .long sys_access .long sys_nice .long sys_ni_syscall /* 35 - old ftime syscall holder */ .long sys_sync .long sys_kill .long sys_rename .long sys_mkdir .long sys_rmdir /* 40 */ .long sys_dup .long sys_pipe .long sys_times .long sys_ni_syscall /* old prof syscall holder */ .long sys_brk /* 45 */ .long sys_setgid16 .long sys_getgid16 .long sys_signal .long sys_geteuid16 .long sys_getegid16 /* 50 */ .long sys_acct .long sys_umount /* recycled never used phys() */ .long sys_ni_syscall /* old lock syscall holder */ .long sys_ioctl .long sys_fcntl /* 55 */ .long sys_ni_syscall /* old mpx syscall holder */ .long sys_setpgid .long sys_ni_syscall /* old ulimit syscall holder */ .long sys_olduname .long sys_umask /* 60 */ .long sys_chroot .long sys_ustat .long sys_dup2 .long sys_getppid .long sys_getpgrp /* 65 */ .long sys_setsid .long sys_sigaction .long sys_sgetmask .long sys_ssetmask .long sys_setreuid16 /* 70 */ .long sys_setregid16 .long sys_sigsuspend .long sys_sigpending .long sys_sethostname .long sys_setrlimit /* 75 */ .long sys_old_getrlimit .long sys_getrusage .long sys_gettimeofday .long sys_settimeofday .long sys_getgroups16 /* 80 */ .long sys_setgroups16 .long old_select .long sys_symlink .long sys_lstat .long sys_readlink /* 85 */ .long sys_uselib .long sys_swapon .long sys_reboot .long sys_old_readdir .long old_mmap /* 90 */ .long sys_munmap .long sys_truncate .long sys_ftruncate .long sys_fchmod .long sys_fchown16 /* 95 */ .long sys_getpriority .long sys_setpriority .long sys_ni_syscall /* old profil syscall holder */ .long sys_statfs .long sys_fstatfs /* 100 */ .long sys_ioperm .long sys_socketcall .long sys_syslog .long sys_setitimer .long sys_getitimer /* 105 */ .long sys_newstat .long sys_newlstat .long sys_newfstat .long sys_uname .long ptregs_iopl /* 110 */ .long sys_vhangup .long sys_ni_syscall /* old "idle" system call */ .long ptregs_vm86old .long sys_wait4 .long sys_swapoff /* 115 */ .long sys_sysinfo .long sys_ipc .long sys_fsync .long ptregs_sigreturn .long ptregs_clone /* 120 */ .long sys_setdomainname .long sys_newuname .long sys_modify_ldt .long sys_adjtimex .long sys_mprotect /* 125 */ .long sys_sigprocmask .long sys_ni_syscall /* old "create_module" */ .long sys_init_module .long sys_delete_module .long sys_ni_syscall /* 130: old "get_kernel_syms" */ .long sys_quotactl .long sys_getpgid .long sys_fchdir .long sys_bdflush .long sys_sysfs /* 135 */ .long sys_personality .long sys_ni_syscall /* reserved for afs_syscall */ .long sys_setfsuid16 .long sys_setfsgid16 .long sys_llseek /* 140 */ .long sys_getdents .long sys_select .long sys_flock .long sys_msync .long sys_readv /* 145 */ .long sys_writev .long sys_getsid .long sys_fdatasync .long sys_sysctl .long sys_mlock /* 150 */ .long sys_munlock .long sys_mlockall .long sys_munlockall .long sys_sched_setparam .long sys_sched_getparam /* 155 */ .long sys_sched_setscheduler .long sys_sched_getscheduler .long sys_sched_yield .long sys_sched_get_priority_max .long sys_sched_get_priority_min /* 160 */ .long sys_sched_rr_get_interval .long sys_nanosleep .long sys_mremap .long sys_setresuid16 .long sys_getresuid16 /* 165 */ .long ptregs_vm86 .long sys_ni_syscall /* Old sys_query_module */ .long sys_poll .long sys_nfsservctl .long sys_setresgid16 /* 170 */ .long sys_getresgid16 .long sys_prctl .long ptregs_rt_sigreturn .long sys_rt_sigaction .long sys_rt_sigprocmask /* 175 */ .long sys_rt_sigpending .long sys_rt_sigtimedwait .long sys_rt_sigqueueinfo .long sys_rt_sigsuspend .long sys_pread64 /* 180 */ .long sys_pwrite64 .long sys_chown16 .long sys_getcwd .long sys_capget .long sys_capset /* 185 */ .long ptregs_sigaltstack .long sys_sendfile .long sys_ni_syscall /* reserved for streams1 */ .long sys_ni_syscall /* reserved for streams2 */ .long ptregs_vfork /* 190 */ .long sys_getrlimit .long sys_mmap_pgoff .long sys_truncate64 .long sys_ftruncate64 .long sys_stat64 /* 195 */ .long sys_lstat64 .long sys_fstat64 .long sys_lchown .long sys_getuid .long sys_getgid /* 200 */ .long sys_geteuid .long sys_getegid .long sys_setreuid .long sys_setregid .long sys_getgroups /* 205 */ .long sys_setgroups .long sys_fchown .long sys_setresuid .long sys_getresuid .long sys_setresgid /* 210 */ .long sys_getresgid .long sys_chown .long sys_setuid .long sys_setgid .long sys_setfsuid /* 215 */ .long sys_setfsgid .long sys_pivot_root .long sys_mincore .long sys_madvise .long sys_getdents64 /* 220 */ .long sys_fcntl64 .long sys_ni_syscall /* reserved for TUX */ .long sys_ni_syscall .long sys_gettid .long sys_readahead /* 225 */ .long sys_setxattr .long sys_lsetxattr .long sys_fsetxattr .long sys_getxattr .long sys_lgetxattr /* 230 */ .long sys_fgetxattr .long sys_listxattr .long sys_llistxattr .long sys_flistxattr .long sys_removexattr /* 235 */ .long sys_lremovexattr .long sys_fremovexattr .long sys_tkill .long sys_sendfile64 .long sys_futex /* 240 */ .long sys_sched_setaffinity .long sys_sched_getaffinity .long sys_set_thread_area .long sys_get_thread_area .long sys_io_setup /* 245 */ .long sys_io_destroy .long sys_io_getevents .long sys_io_submit .long sys_io_cancel .long sys_fadvise64 /* 250 */ .long sys_ni_syscall .long sys_exit_group .long sys_lookup_dcookie .long sys_epoll_create .long sys_epoll_ctl /* 255 */ .long sys_epoll_wait .long sys_remap_file_pages .long sys_set_tid_address .long sys_timer_create .long sys_timer_settime /* 260 */ .long sys_timer_gettime .long sys_timer_getoverrun .long sys_timer_delete .long sys_clock_settime .long sys_clock_gettime /* 265 */ .long sys_clock_getres .long sys_clock_nanosleep .long sys_statfs64 .long sys_fstatfs64 .long sys_tgkill /* 270 */ .long sys_utimes .long sys_fadvise64_64 .long sys_ni_syscall /* sys_vserver */ .long sys_mbind .long sys_get_mempolicy .long sys_set_mempolicy .long sys_mq_open .long sys_mq_unlink .long sys_mq_timedsend .long sys_mq_timedreceive /* 280 */ .long sys_mq_notify .long sys_mq_getsetattr .long sys_kexec_load .long sys_waitid .long sys_ni_syscall /* 285 */ /* available */ .long sys_add_key .long sys_request_key .long sys_keyctl .long sys_ioprio_set .long sys_ioprio_get /* 290 */ .long sys_inotify_init .long sys_inotify_add_watch .long sys_inotify_rm_watch .long sys_migrate_pages .long sys_openat /* 295 */ .long sys_mkdirat .long sys_mknodat .long sys_fchownat .long sys_futimesat .long sys_fstatat64 /* 300 */ .long sys_unlinkat .long sys_renameat .long sys_linkat .long sys_symlinkat .long sys_readlinkat /* 305 */ .long sys_fchmodat .long sys_faccessat .long sys_pselect6 .long sys_ppoll .long sys_unshare /* 310 */ .long sys_set_robust_list .long sys_get_robust_list .long sys_splice .long sys_sync_file_range .long sys_tee /* 315 */ .long sys_vmsplice .long sys_move_pages .long sys_getcpu .long sys_epoll_pwait .long sys_utimensat /* 320 */ .long sys_signalfd .long sys_timerfd_create .long sys_eventfd .long sys_fallocate .long sys_timerfd_settime /* 325 */ .long sys_timerfd_gettime .long sys_signalfd4 .long sys_eventfd2 .long sys_epoll_create1 .long sys_dup3 /* 330 */ .long sys_pipe2 .long sys_inotify_init1 .long sys_preadv .long sys_pwritev .long sys_rt_tgsigqueueinfo /* 335 */ .long sys_perf_event_open .long sys_recvmmsg .long sys_ni_syscall /* sys_fanotify_init */ .long sys_ni_syscall /* sys_fanotify_mark */ .long sys_ni_syscall /* sys_prlimit64 340 */ .long sys_ni_syscall /* sys_name_to_handle_at */ .long sys_ni_syscall /* sys_open_by_handle_at */ .long sys_clock_adjtime .long sys_syncfs .long sys_sendmmsg /* 345 */ .long sys_setns .long sys_process_vm_readv .long sys_process_vm_writev ```

• getcpu, *mmsg, fflags in statfs
• prlimit64 is also mentioned in the sources
• verify /proc/$pid/task/$tid/comm on a running instance
• understand

  also I added a lot of consolidation implementations that changed slight which syscall was used, it might not be supported on 2.6.32

• find a reasonable way to disable the check. We would probably prefer to still get a readable error on truly unsupported kernels. (try asking glibc upstream first?)