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From: Maynard J. <may...@us...> - 2011-09-16 22:40:52
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I am doing some validation of the latest valgrind code on some ppc64 systems.
One problem I've run into is that a number of memcheck/tests are failing because
the stderr output shows some line numbers that are off by 1-3 lines compared to
what's expected. I'm not seeing this on x86 -- just ppc64. For example,
memcheck/tests/addressable fails as follows:
----------------------------------
--- addressable.stderr.exp 2011-09-14 12:08:53.000000000 -0500
+++ addressable.stderr.out 2011-09-14 12:47:35.000000000 -0500
@@ -9,7 +9,7 @@
For counts of detected and suppressed errors, rerun with: -v
ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Unaddressable byte(s) found during client check request
- at 0x........: test2 (addressable.c:48)
+ at 0x........: test2 (addressable.c:51)
by 0x........: main (addressable.c:125)
Address 0x........ is not stack'd, malloc'd or (recently) free'd
----------------------------------
Notably, the same testcase runs fine in valgrind 3.6.1. And I see no changes to
the testcase or expected output between 3.6.1 and current SVN code. I see this
problem on both ppc64 systems I've tested on so far, one being a POWER7/SLES 11
SP1 and the other a POWER5/SLES 10 SP3. Does anyone have any idea what may have
changed in regards to debuginfo collection between 3.6.1 and present? I'll
continue to dig, but hoping someone can short-circuit the search by pointing me
in the right direction.
Thanks.
-Maynard
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From: Bart V. A. <bva...@ac...> - 2011-09-18 06:02:44
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On Sat, Sep 17, 2011 at 12:40 AM, Maynard Johnson <may...@us...> wrote: > I am doing some validation of the latest valgrind code on some ppc64 systems. > One problem I've run into is that a number of memcheck/tests are failing because > the stderr output shows some line numbers that are off by 1-3 lines compared to > what's expected. I'm not seeing this on x86 -- just ppc64. For example, > memcheck/tests/addressable fails as follows: > > ---------------------------------- > --- addressable.stderr.exp 2011-09-14 12:08:53.000000000 -0500 > +++ addressable.stderr.out 2011-09-14 12:47:35.000000000 -0500 > @@ -9,7 +9,7 @@ > For counts of detected and suppressed errors, rerun with: -v > ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) > Unaddressable byte(s) found during client check request > - at 0x........: test2 (addressable.c:48) > + at 0x........: test2 (addressable.c:51) > by 0x........: main (addressable.c:125) > Address 0x........ is not stack'd, malloc'd or (recently) free'd > > ---------------------------------- > > Notably, the same testcase runs fine in valgrind 3.6.1. And I see no changes to > the testcase or expected output between 3.6.1 and current SVN code. I see this > problem on both ppc64 systems I've tested on so far, one being a POWER7/SLES 11 > SP1 and the other a POWER5/SLES 10 SP3. Does anyone have any idea what may have > changed in regards to debuginfo collection between 3.6.1 and present? I'll > continue to dig, but hoping someone can short-circuit the search by pointing me > in the right direction. This might be caused by changes in the stack walking code. One way to find out which source code changes caused the above behavior changes is by bisecting the trunk. At least those changes are worth a closer look: * The CFI annotations introduced around October 6, 2010. * Various changes in coregrind/m_stacktrace.c. * Various changes in coregrind/m_debuginfo. Bart. |
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From: Philippe W. <phi...@sk...> - 2011-09-18 15:46:27
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> > Notably, the same testcase runs fine in valgrind 3.6.1. And I see no changes to > > the testcase or expected output between 3.6.1 and current SVN code. I see this > > problem on both ppc64 systems I've tested on so far, one being a POWER7/SLES 11 > > SP1 and the other a POWER5/SLES 10 SP3. Does anyone have any idea what may have > > changed in regards to debuginfo collection between 3.6.1 and present? I'll > > continue to dig, but hoping someone can short-circuit the search by pointing me > > in the right direction. > This might be caused by changes in the stack walking code. One way to > find out which source code changes caused the above behavior changes > is by bisecting the trunk. At least those changes are worth a closer > look: > * The CFI annotations introduced around October 6, 2010. > * Various changes in coregrind/m_stacktrace.c. > * Various changes in coregrind/m_debuginfo. I looked on a ppc64 (PS3). The test also shows the line 51 instead of the expected line 48. Connecting with gdb to the Valgrind gdbserver, I see that gdb produces the same stack trace as the Valgrind stack unwinder. As Valgrind and gdb stack unwinder agrees, I imagine the difference is not caused by the Valgrind debug info reader (as otherwise the gdb stacktrace would not be impacted). So, a possible cause for the difference might be in the code generated byValgrind (e.g. for the client request and the maintenance of the simulated program counter) : if the code emitted for the client request does not store back the exact program counter to the VEX state before doing the client request, then both Valgrind and gdb unwinder will wrongly show another program counter. E.g. I do not know how the Valgrind optimiser is informed that a client request can e.g. read various registers and so that the state of these must be properly put back to the VEX state before doing the call ? Philippe |
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From: Julian S. <js...@ac...> - 2011-09-19 03:59:58
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> So, a possible cause for the difference might be in the code generated > byValgrind (e.g. for the client request and the maintenance of the > simulated program counter) : if the code emitted for the client request > does not store back the exact program counter to the VEX state before > doing the client request, then both Valgrind and gdb unwinder will wrongly > show another program counter. > E.g. I do not know how the Valgrind optimiser is informed that a client > request can e.g. read various registers and so that the state of these > must be properly put back to the VEX state before doing the call ? This was my first guess too. But the thing is, AFAIR vex makes all guest registers be up to date before doing a client request, because a client request terminates a superblock, and all guest registers are up to date at the end of a superblock -- at least in this case, when the dispatch-ppc64-linux.S dispatcher returns to m_scheduler in order to carry out the client request. So I am not sure what's going on here. J |
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From: Julian S. <js...@ac...> - 2011-09-19 03:55:23
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I've long noticed this on ppc64, but never chased it. There are a couple of things you could do: * first, figure out if the error is in gcc or valgrind. Use addr2line to map the code addresses shown by valgrind back to line numbers, independent of valgrind's mechanism for that, to see what you get. * see if it's to do with vex's IR level optimisations making slightly out of date guest register values appear in the unwinder. Do any of the following flags (independently, not in combination) change the results? --vex-iropt-precise-memory-exns=yes --vex-iropt-level=0 --vex-guest-max-insns=1 J On Saturday, September 17, 2011, Maynard Johnson wrote: > I am doing some validation of the latest valgrind code on some ppc64 > systems. One problem I've run into is that a number of memcheck/tests are > failing because the stderr output shows some line numbers that are off by > 1-3 lines compared to what's expected. I'm not seeing this on x86 -- just > ppc64. For example, memcheck/tests/addressable fails as follows: > > ---------------------------------- > --- addressable.stderr.exp 2011-09-14 12:08:53.000000000 -0500 > +++ addressable.stderr.out 2011-09-14 12:47:35.000000000 -0500 > @@ -9,7 +9,7 @@ > For counts of detected and suppressed errors, rerun with: -v > ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) > Unaddressable byte(s) found during client check request > - at 0x........: test2 (addressable.c:48) > + at 0x........: test2 (addressable.c:51) > by 0x........: main (addressable.c:125) > Address 0x........ is not stack'd, malloc'd or (recently) free'd > > ---------------------------------- > > Notably, the same testcase runs fine in valgrind 3.6.1. And I see no > changes to the testcase or expected output between 3.6.1 and current SVN > code. I see this problem on both ppc64 systems I've tested on so far, one > being a POWER7/SLES 11 SP1 and the other a POWER5/SLES 10 SP3. Does > anyone have any idea what may have changed in regards to debuginfo > collection between 3.6.1 and present? I'll continue to dig, but hoping > someone can short-circuit the search by pointing me in the right > direction. > > Thanks. > -Maynard > > > --------------------------------------------------------------------------- > --- BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA > http://p.sf.net/sfu/rim-devcon-copy2 > _______________________________________________ > Valgrind-developers mailing list > Val...@li... > https://lists.sourceforge.net/lists/listinfo/valgrind-developers |
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From: Maynard J. <may...@us...> - 2011-09-19 13:51:15
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Julian Seward wrote: > > I've long noticed this on ppc64, but never chased it. There are a couple > of things you could do: > > * first, figure out if the error is in gcc or valgrind. Use addr2line > to map the code addresses shown by valgrind back to line numbers, > independent of valgrind's mechanism for that, to see what you get. The addresses and line numbers that valgrind reports do correspond with addr2line, so it seems the addresses themselves must be wrong. I also compared the compile commands for memcheck/tests/addressable between 3.6.1 and SVN and they look equivalent. I even copy/pasted the 3.6.1 compile line and used it in my svn devel tree, but that made no difference when running the testcase. > > * see if it's to do with vex's IR level optimisations making slightly > out of date guest register values appear in the unwinder. Do > any of the following flags (independently, not in combination) > change the results? > --vex-iropt-precise-memory-exns=yes > --vex-iropt-level=0 > --vex-guest-max-insns=1 None of these helped, so I'll get some detailed debugging output using --trace-flags. -Maynard > > J > > On Saturday, September 17, 2011, Maynard Johnson wrote: >> I am doing some validation of the latest valgrind code on some ppc64 >> systems. One problem I've run into is that a number of memcheck/tests are >> failing because the stderr output shows some line numbers that are off by >> 1-3 lines compared to what's expected. I'm not seeing this on x86 -- just >> ppc64. For example, memcheck/tests/addressable fails as follows: >> >> ---------------------------------- >> --- addressable.stderr.exp 2011-09-14 12:08:53.000000000 -0500 >> +++ addressable.stderr.out 2011-09-14 12:47:35.000000000 -0500 >> @@ -9,7 +9,7 @@ >> For counts of detected and suppressed errors, rerun with: -v >> ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) >> Unaddressable byte(s) found during client check request >> - at 0x........: test2 (addressable.c:48) >> + at 0x........: test2 (addressable.c:51) >> by 0x........: main (addressable.c:125) >> Address 0x........ is not stack'd, malloc'd or (recently) free'd >> >> ---------------------------------- >> >> Notably, the same testcase runs fine in valgrind 3.6.1. And I see no >> changes to the testcase or expected output between 3.6.1 and current SVN >> code. I see this problem on both ppc64 systems I've tested on so far, one >> being a POWER7/SLES 11 SP1 and the other a POWER5/SLES 10 SP3. Does >> anyone have any idea what may have changed in regards to debuginfo >> collection between 3.6.1 and present? I'll continue to dig, but hoping >> someone can short-circuit the search by pointing me in the right >> direction. >> >> Thanks. >> -Maynard >> >> >> --------------------------------------------------------------------------- >> --- BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA >> http://p.sf.net/sfu/rim-devcon-copy2 >> _______________________________________________ >> Valgrind-developers mailing list >> Val...@li... >> https://lists.sourceforge.net/lists/listinfo/valgrind-developers > |
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From: Julian S. <js...@ac...> - 2011-09-19 16:47:49
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> > * first, figure out if the error is in gcc or valgrind. Use addr2line > > to map the code addresses shown by valgrind back to line numbers, > > independent of valgrind's mechanism for that, to see what you get. > > The addresses and line numbers that valgrind reports do correspond with > addr2line, so it seems the addresses themselves must be wrong. Ok .. so V's address-to-line mapping is OK, at least. > > out of date guest register values appear in the unwinder. Do > > any of the following flags (independently, not in combination) > > change the results? > > --vex-iropt-precise-memory-exns=yes > > --vex-iropt-level=0 > > --vex-guest-max-insns=1 > > None of these helped, so I'll get some detailed debugging output using > --trace-flags. Strange that these don't make any difference. It would be useful to get the just-before-instruction-selection IR for the block containing the client request, to see if there's anything amiss there. Another question is: does the inaccuracy happen on the innermost frame, or also on non-innermost frames? If on the innermost frame then we can discount any wierdness caused by the stack unwinder, since the PC for the innermost frame is take directly from the guest PC (guest_CIA) unmodified. J |
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From: Maynard J. <may...@us...> - 2011-09-26 22:32:58
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Bart Van Assche wrote: > On Sat, Sep 17, 2011 at 12:40 AM, Maynard Johnson <may...@us...> wrote: >> I am doing some validation of the latest valgrind code on some ppc64 systems. >> One problem I've run into is that a number of memcheck/tests are failing because >> the stderr output shows some line numbers that are off by 1-3 lines compared to >> what's expected. I'm not seeing this on x86 -- just ppc64. For example, >> memcheck/tests/addressable fails as follows: >> >> ---------------------------------- >> --- addressable.stderr.exp 2011-09-14 12:08:53.000000000 -0500 >> +++ addressable.stderr.out 2011-09-14 12:47:35.000000000 -0500 >> @@ -9,7 +9,7 @@ >> For counts of detected and suppressed errors, rerun with: -v >> ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) >> Unaddressable byte(s) found during client check request >> - at 0x........: test2 (addressable.c:48) >> + at 0x........: test2 (addressable.c:51) >> by 0x........: main (addressable.c:125) >> Address 0x........ is not stack'd, malloc'd or (recently) free'd >> >> ---------------------------------- >> >> Notably, the same testcase runs fine in valgrind 3.6.1. And I see no changes to >> the testcase or expected output between 3.6.1 and current SVN code. I see this >> problem on both ppc64 systems I've tested on so far, one being a POWER7/SLES 11 >> SP1 and the other a POWER5/SLES 10 SP3. Does anyone have any idea what may have >> changed in regards to debuginfo collection between 3.6.1 and present? I'll >> continue to dig, but hoping someone can short-circuit the search by pointing me >> in the right direction. > > This might be caused by changes in the stack walking code. One way to > find out which source code changes caused the above behavior changes > is by bisecting the trunk. At least those changes are worth a closer Bart, Getting back to this issue after being pulled away last week on another project. I bisected as you suggested and found that r11755 is the culprit (committed on May 15). Any thoughts? -Maynard > look: > * The CFI annotations introduced around October 6, 2010. > * Various changes in coregrind/m_stacktrace.c. > * Various changes in coregrind/m_debuginfo. > > Bart. |
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From: Bart V. A. <bva...@ac...> - 2011-09-27 06:11:55
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On Tue, Sep 27, 2011 at 12:32 AM, Maynard Johnson <may...@us...> wrote: > Bart Van Assche wrote: > > On Sat, Sep 17, 2011 at 12:40 AM, Maynard Johnson <may...@us...> wrote: > >> I am doing some validation of the latest valgrind code on some ppc64 systems. > >> One problem I've run into is that a number of memcheck/tests are failing because > >> the stderr output shows some line numbers that are off by 1-3 lines compared to > >> what's expected. I'm not seeing this on x86 -- just ppc64. For example, > >> memcheck/tests/addressable fails as follows: > >> > >> ---------------------------------- > >> --- addressable.stderr.exp 2011-09-14 12:08:53.000000000 -0500 > >> +++ addressable.stderr.out 2011-09-14 12:47:35.000000000 -0500 > >> @@ -9,7 +9,7 @@ > >> For counts of detected and suppressed errors, rerun with: -v > >> ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) > >> Unaddressable byte(s) found during client check request > >> - at 0x........: test2 (addressable.c:48) > >> + at 0x........: test2 (addressable.c:51) > >> by 0x........: main (addressable.c:125) > >> Address 0x........ is not stack'd, malloc'd or (recently) free'd > >> > >> ---------------------------------- > >> > >> Notably, the same testcase runs fine in valgrind 3.6.1. And I see no changes to > >> the testcase or expected output between 3.6.1 and current SVN code. I see this > >> problem on both ppc64 systems I've tested on so far, one being a POWER7/SLES 11 > >> SP1 and the other a POWER5/SLES 10 SP3. Does anyone have any idea what may have > >> changed in regards to debuginfo collection between 3.6.1 and present? I'll > >> continue to dig, but hoping someone can short-circuit the search by pointing me > >> in the right direction. > > > > This might be caused by changes in the stack walking code. One way to > > find out which source code changes caused the above behavior changes > > is by bisecting the trunk. At least those changes are worth a closer > > Getting back to this issue after being pulled away last week on another project. I bisected as you suggested and found that r11755 is the culprit (committed on May 15). Any thoughts? I've reviewed the changes in that patch but couldn't find anything obvious that would break stack walking. So IMHO the only way forward is to make sure that we understand completely why the stack traces are not as we expect. By the way, for some distros stack traces were already incorrect on x86_64 before r11755 (see also https://bugs.kde.org/show_bug.cgi?id=204441). Bart. |
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From: Julian S. <js...@ac...> - 2011-09-27 07:24:02
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> > Getting back to this issue after being pulled away last week on another > > project. I bisected as you suggested and found that r11755 is the > > culprit (committed on May 15). Any thoughts? > > I've reviewed the changes in that patch but couldn't find anything > obvious that would break stack walking. Yeah, I also looked at 11755 and came to the same conclusion as Bart. Are you 110% it was 11755 that caused the change? J |
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From: Maynard J. <may...@us...> - 2011-09-27 23:26:25
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Julian Seward wrote: > >>> Getting back to this issue after being pulled away last week on another >>> project. I bisected as you suggested and found that r11755 is the >>> culprit (committed on May 15). Any thoughts? >> >> I've reviewed the changes in that patch but couldn't find anything >> obvious that would break stack walking. > > Yeah, I also looked at 11755 and came to the same conclusion as Bart. > Are you 110% it was 11755 that caused the change? Well, maybe my bisecting method was flawed. The two sets of revision tags (one for vex and one for valgrind) is a bit confusing to me. There's probably a more clever way of doing a checkout than the way I did it. I tried using a data spec, but that didn't work. svn checked out the valgrind base from that date (evidenced by the rev #), but the vex part checked out was the most current rev #! So rather than beat my head against a wall, I just did sort of a brute force method. Here are the steps I performed: svn co -r2151 svn://svn.valgrind.org/vex/trunk VEX svn co -r11754 svn://svn.valgrind.org/valgrind/trunk valg_svn_r11754 rm -rf valg_svn_r11754/VEX cp -r VEX valg_svn_r11754/ svn co -r11755 svn://svn.valgrind.org/valgrind/trunk valg_svn_r11755 rm -rf valg_svn_r11755/VEX cp -r VEX valg_svn_r11755/ -Maynard > > J |
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From: Maynard J. <may...@us...> - 2011-09-29 21:20:13
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On 09/27/2011 6:26 PM, Maynard Johnson wrote: > Julian Seward wrote: >> >>>> Getting back to this issue after being pulled away last week on another >>>> project. I bisected as you suggested and found that r11755 is the >>>> culprit (committed on May 15). Any thoughts? >>> >>> I've reviewed the changes in that patch but couldn't find anything >>> obvious that would break stack walking. >> >> Yeah, I also looked at 11755 and came to the same conclusion as Bart. >> Are you 110% it was 11755 that caused the change? > Well, maybe my bisecting method was flawed. The two sets of revision tags (one for vex and one for valgrind) is a bit confusing to me. There's probably a more clever way of doing a checkout than the way I did it. I tried using a data spec, but that didn't work. svn checked out the valgrind base from that date (evidenced by the rev #), but the vex part checked out was the most current rev #! So rather than beat my head against a wall, I just did sort of a brute force method. Here are the steps I performed: > > svn co -r2151 svn://svn.valgrind.org/vex/trunk VEX > svn co -r11754 svn://svn.valgrind.org/valgrind/trunk valg_svn_r11754 > rm -rf valg_svn_r11754/VEX > cp -r VEX valg_svn_r11754/ > svn co -r11755 svn://svn.valgrind.org/valgrind/trunk valg_svn_r11755 > rm -rf valg_svn_r11755/VEX > cp -r VEX valg_svn_r11755/ Got distracted yesterday, but when I returned to this issue today, I un-applied the r11755 patch from the valg_svn_r11755 directory, rebuilt, and ran the memcheck/tests/addressable testcase -- it passed! So I'm very confident that something in r11755 broke ppc64 line number resolution. Just for yucks, I recompiled 'adressable' as 32-bit. The difference between actual output for the 32-bit test and expected output was as follows: <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< --- addressable.stderr.exp 2011-09-26 17:15:47.000000000 -0500 +++ addressable.stderr.out 2011-09-29 13:37:18.000000000 -0500 @@ -19,16 +19,6 @@ Address 0x........ is not stack'd, malloc'd or (recently) free'd -Process terminating with default action of signal N (SIGSEGV or SIGBUS) - Bad memory (SIGSEGV or SIGBUS) at address 0x........ - at 0x........: test2 (addressable.c:51) - by 0x........: main (addressable.c:125) - If you believe this happened as a result of a stack - overflow in your program's main thread (unlikely but - possible), you can try to increase the size of the - main thread stack using the --main-stacksize= flag. - The main thread stack size used in this run was .... - HEAP SUMMARY: in use at exit: ... bytes in ... blocks total heap usage: ... allocs, ... frees, ... bytes allocated >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> So there was one missing expected error; but the other expected errors were present, with the correct line numbers. So the "incorrect source line numbers" problem I'm chasing seems to be restricted to ppc64. I'll continue to investigate as I have time. -Maynard > > -Maynard >> >> J |
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From: Maynard J. <may...@us...> - 2011-09-30 16:12:49
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Inadvertently dropped Bart from this conversation, so I'm re-adding him. See below . . . Maynard Johnson wrote: > On 09/27/2011 6:26 PM, Maynard Johnson wrote: >> Julian Seward wrote: >>> >>>>> Getting back to this issue after being pulled away last week on another >>>>> project. I bisected as you suggested and found that r11755 is the >>>>> culprit (committed on May 15). Any thoughts? >>>> >>>> I've reviewed the changes in that patch but couldn't find anything >>>> obvious that would break stack walking. >>> >>> Yeah, I also looked at 11755 and came to the same conclusion as Bart. >>> Are you 110% it was 11755 that caused the change? >> Well, maybe my bisecting method was flawed. The two sets of revision tags (one for vex and one for valgrind) is a bit confusing to me. There's probably a more clever way of doing a checkout than the way I did it. I tried using a data spec, but that didn't work. svn checked out the valgrind base from that date (evidenced by the rev #), but the vex part checked out was the most current rev #! So rather than beat my head against a wall, I just did sort of a brute force method. Here are the steps I performed: >> >> svn co -r2151 svn://svn.valgrind.org/vex/trunk VEX >> svn co -r11754 svn://svn.valgrind.org/valgrind/trunk valg_svn_r11754 >> rm -rf valg_svn_r11754/VEX >> cp -r VEX valg_svn_r11754/ >> svn co -r11755 svn://svn.valgrind.org/valgrind/trunk valg_svn_r11755 >> rm -rf valg_svn_r11755/VEX >> cp -r VEX valg_svn_r11755/ > > Got distracted yesterday, but when I returned to this issue today, I un-applied > the r11755 patch from the valg_svn_r11755 directory, rebuilt, and ran the > memcheck/tests/addressable testcase -- it passed! So I'm very confident that > something in r11755 broke ppc64 line number resolution. When I run the addressable testcase built in valg_svn_r11754 with the valgrind code of r11755, it passes (and vice versa). And since there aren't any special object files compiled into 'addressable', the only possibility for this result was a difference in header files included in addressable.c. The valgrind.h header file looked like the best candidate, so I swapped header files between the two valgrind source trees, rebuilt and retested. The test results were now switched around -- the r11754 tree now failed the addressable test and the r11755 tree passed it. *Bart*, I've been staring all morning at the changes to valgrind.h that occurred with r11755, and I can't see what's causing the problem. Can you help? Thanks! -Maynard [snip] > > -Maynard > > >> >> -Maynard >>> >>> J > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2dcopy1 > _______________________________________________ > Valgrind-developers mailing list > Val...@li... > https://lists.sourceforge.net/lists/listinfo/valgrind-developers > |