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From: "lberk at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels
Date: Fri, 11 Apr 2014 21:48:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=16836

            Bug ID: 16836
           Summary: CFI expression underflow occurs during unwinding on
                    some kernels
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: lberk at redhat dot com

Running stap -e 'probe kernel.function("__run_hrtimer") { log ("hit!");
print_backtrace(); log("done"); exit(); }' on 3.13.6-100.fc19.x86_64,
3.13.7-100.fc19.x86_64 and 3.13.7-200.fc20.x86_64 causes a WARNING: DWARF
expression stack underflow in CFI (full output below)

WARNING: DWARF expression stack underflow in CFI
hit!
 0xffffffff81091ff0 : __run_hrtimer+0x0/0x1d0 [kernel]
 0xffffffff81092877 : hrtimer_interrupt+0xf7/0x240 [kernel]
 0xffffffff81042dc7 : local_apic_timer_interrupt+0x37/0x60 [kernel]
 0xffffffff8169203f : smp_apic_timer_interrupt+0x3f/0x60 [kernel]
 0xffffffff816909dd : apic_timer_interrupt+0x6d/0x80 [kernel]
done
hit!
 0xffffffff81091ff0 : __run_hrtimer+0x0/0x1d0 [kernel]
 0xffffffff81092877 : hrtimer_interrupt+0xf7/0x240 [kernel]
 0xffffffff81042dc7 : local_apic_timer_interrupt+0x37/0x60 [kernel]
 0xffffffff8169203f : smp_apic_timer_interrupt+0x3f/0x60 [kernel]
 0xffffffff816909dd : apic_timer_interrupt+0x6d/0x80 [kernel]
done
Pass 5: run completed in 10usr/70sys/679real ms.

This reportedly runs without the warning on 3.15.0-rc0.git9.1.fc21.x86_64

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