Only on CentOS-5 and CentOS-6 (IMO OSes without longjmp probes) for 32-bit targets (x86_64-m32 and i686; not for x86_64) I get infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME^M infrun: inserting longjmp-resume breakpoint at 0x8c0d289e^M Warning:^M Cannot insert breakpoint 0.^M Cannot access memory at address 0x8c0d289e^M ^M infrun: stop_stepping^M [Switching to Thread 0xf75f1b70 (LWP 24297)]^M __libc_siglongjmp (env=0xf75f1454, val=1) at longjmp.c:30^M 30 {^M (gdb) FAIL: gdb.threads/multiple-step-overs.exp: next At about 1st to 6th run. It happens already on the first check-in of this testcase: 99619beac6252113fed212fdb9e1ab97bface423 It still happens on current FSF GDB trunk: fe1873d01904620c71a309249c0ae029e53ae0b6 See also: PR 17174