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Got it.
After changing personality (line 215), there is a comparison made between "un.machine" and "transitions[i].result_arch", with following values:
- un.machine == "ppcle"
- transitions[i].result_arch == "ppc"
This makes the code fail on line 227 which has been optimized (so showing as line 212).
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:3178
Description of problem: On a ppc64le system, trying to change the personality using "setarch ppc<*>" fails with "Unrecognized architecture", e.g.: # uname -m ppc64le # setarch ppc32 uname -m setarch: ppc32: Unrecognized architecture Using "linux32" works: # setarch linux32 uname -m ppcle Version-Release number of selected component (if applicable): util-linux-2.23.2-43.el7_4.2.ppc64le How reproducible: Always Additional info: Running under gdb, we can see the code is working as expected, until "uname(&un)" is reached (line 218), then some "rollback" occurs (error printed on line 212). # gdb --args /usr/bin/setarch ppc32 uname -m (gdb) break set_arch Breakpoint 1 at 0x10001ae8: file sys-utils/setarch.c, line 140. (gdb) run Starting program: /usr/bin/setarch ppc32 uname -m Breakpoint 1, 0x0000000010001ae8 in set_arch (pers=0x3ffffffff3ca "ppc32", options=0, list=0) at sys-utils/setarch.c:140 140 { (gdb) next 148 } transitions[] = { (gdb) 140 { (gdb) 148 } transitions[] = { (gdb) 140 { (gdb) 148 } transitions[] = { (gdb) 140 { (gdb) 148 } transitions[] = { (gdb) 201 if (list) { (gdb) 207 for(i = 0; transitions[i].perval >= 0; i++) (gdb) 208 if(!strcmp(pers, transitions[i].target_arch)) (gdb) 207 for(i = 0; transitions[i].perval >= 0; i++) (gdb) 208 if(!strcmp(pers, transitions[i].target_arch)) (gdb) 207 for(i = 0; transitions[i].perval >= 0; i++) (gdb) 208 if(!strcmp(pers, transitions[i].target_arch)) (gdb) 215 if (set_pers(pers_value) == -EINVAL) (gdb) 218 uname(&un); (gdb) 219 if(transitions[i].result_arch && (gdb) p un $1 = {sysname = "Linux", '\000' <repeats 59 times>, nodename = "ibm-p8-02-lp1.rhts.eng.bos.redhat.com", '\000' <repeats 27 times>, release = "3.10.0-693.21.1.el7.ppc64le", '\000' <repeats 37 times>, version = "#1 SMP Fri Feb 23 14:02:56 EST 2018", '\000' <repeats 29 times>, machine = "ppcle", '\000' <repeats 59 times>, domainname = "(none)", '\000' <repeats 58 times>} (gdb) next 220 strcmp(un.machine, transitions[i].result_arch)) (gdb) 219 if(transitions[i].result_arch && (gdb) 222 if(strcmp(transitions[i].result_arch, "i386") (gdb) 212 errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers); (gdb) setarch: ppc32: Unrecognized architecture [Inferior 1 (process 10531) exited with code 01]