* Re: Get Different Result for the same core file with different versions of gdb. [not found] <CAKU4AWpCgnZyOjMWW5XMYKQvMosRFX1r1OadJ42AoXW7cNnw8A@mail.gmail.com> @ 2021-02-02 2:15 ` Andy Fan 2021-02-02 15:30 ` Simon Marchi 0 siblings, 1 reply; 4+ messages in thread From: Andy Fan @ 2021-02-02 2:15 UTC (permalink / raw) To: gdb On Mon, Feb 1, 2021 at 11:57 AM Andy Fan <zhihui.fan1213@gmail.com> wrote: > Hi: > > You can pay attention to $2 and $3.They check the same addr in the same > core file. > I'm sure I am debugging the same file in the same machine. > > GDB 7.6: > > (gdb) up 3 > #3 ResetPlanCache () at plancache.c:1922 > 1922 plancache.c: No such file or directory. > (gdb) p ((AllocSet)plansource->query_context)->freelist > $1 = {0x0, *0x5bdd3b8*, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0} > (gdb) p *((AllocSet)plansource->query_context)->freelist[1] > *$2 = {size = 10649824, aset = 0xa283c0 <AllocSetFree>}* > (gdb) p plansource->query_context->name > *$3 = 0xbfd929 "unnamed prepared statement"* > (gdb) x /10c plansource->query_context->name > 0xbfd929: 117 'u' 110 'n' 110 'n' 97 'a' 109 'm' 101 'e' 100 'd' 32 ' ' > 0xbfd931: 112 'p' 114 'r' > (gdb) quit > > > GDB 9.2: > (gdb) up 3 > #3 ResetPlanCache () at plancache.c:1922 > 1922 plancache.c: No such file or directory. > (gdb) p ((AllocSet)plansource->query_context)->freelist > $1 = {0x0, *0x5bdd3b8*, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0} > (gdb) p *((AllocSet)plansource->query_context)->freelist[1] > *$2 = {size = 16, aset = 0x0}* > (gdb) p plansource->query_context->name > *$3 = 0xbfd929 ""* > (gdb) x /10c plansource->query_context->name > 0xbfd929: 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 > '\000' > 0xbfd931: 0 '\000' 0 '\000' > > > Any ideas? Thanks! > > -- > Best Regards > Andy Fan > Will it have something with compiler? The compiler I used to build the software (which generated the core file) is LLVM 6.0.0. -- Best Regards Andy Fan (https://www.aliyun.com/) ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Get Different Result for the same core file with different versions of gdb. 2021-02-02 2:15 ` Get Different Result for the same core file with different versions of gdb Andy Fan @ 2021-02-02 15:30 ` Simon Marchi 2021-02-03 2:56 ` Andy Fan 0 siblings, 1 reply; 4+ messages in thread From: Simon Marchi @ 2021-02-02 15:30 UTC (permalink / raw) To: Andy Fan, gdb On 2021-02-01 9:15 p.m., Andy Fan via Gdb wrote: > On Mon, Feb 1, 2021 at 11:57 AM Andy Fan <zhihui.fan1213@gmail.com> wrote: > >> Hi: >> >> You can pay attention to $2 and $3.They check the same addr in the same >> core file. >> I'm sure I am debugging the same file in the same machine. >> >> GDB 7.6: >> >> (gdb) up 3 >> #3 ResetPlanCache () at plancache.c:1922 >> 1922 plancache.c: No such file or directory. >> (gdb) p ((AllocSet)plansource->query_context)->freelist >> $1 = {0x0, *0x5bdd3b8*, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0} >> (gdb) p *((AllocSet)plansource->query_context)->freelist[1] >> *$2 = {size = 10649824, aset = 0xa283c0 <AllocSetFree>}* >> (gdb) p plansource->query_context->name >> *$3 = 0xbfd929 "unnamed prepared statement"* >> (gdb) x /10c plansource->query_context->name >> 0xbfd929: 117 'u' 110 'n' 110 'n' 97 'a' 109 'm' 101 'e' 100 'd' 32 ' ' >> 0xbfd931: 112 'p' 114 'r' >> (gdb) quit >> >> >> GDB 9.2: >> (gdb) up 3 >> #3 ResetPlanCache () at plancache.c:1922 >> 1922 plancache.c: No such file or directory. >> (gdb) p ((AllocSet)plansource->query_context)->freelist >> $1 = {0x0, *0x5bdd3b8*, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0} >> (gdb) p *((AllocSet)plansource->query_context)->freelist[1] >> *$2 = {size = 16, aset = 0x0}* >> (gdb) p plansource->query_context->name >> *$3 = 0xbfd929 ""* >> (gdb) x /10c plansource->query_context->name >> 0xbfd929: 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 >> '\000' >> 0xbfd931: 0 '\000' 0 '\000' >> >> >> Any ideas? Thanks! >> >> -- >> Best Regards >> Andy Fan >> > > Will it have something with compiler? The compiler I used > to build the software (which generated the core file) is LLVM 6.0.0. At first glance, it sounds like a bug. Can you provide a reproducer? Simon ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Get Different Result for the same core file with different versions of gdb. 2021-02-02 15:30 ` Simon Marchi @ 2021-02-03 2:56 ` Andy Fan 2021-02-03 15:29 ` Simon Marchi 0 siblings, 1 reply; 4+ messages in thread From: Andy Fan @ 2021-02-03 2:56 UTC (permalink / raw) To: Simon Marchi; +Cc: gdb On Tue, Feb 2, 2021 at 11:31 PM Simon Marchi <simon.marchi@polymtl.ca> wrote: > > > On 2021-02-01 9:15 p.m., Andy Fan via Gdb wrote: > > On Mon, Feb 1, 2021 at 11:57 AM Andy Fan <zhihui.fan1213@gmail.com> > wrote: > > > >> Hi: > >> > >> You can pay attention to $2 and $3.They check the same addr in the same > >> core file. > >> I'm sure I am debugging the same file in the same machine. > >> > >> GDB 7.6: > >> > >> (gdb) up 3 > >> #3 ResetPlanCache () at plancache.c:1922 > >> 1922 plancache.c: No such file or directory. > >> (gdb) p ((AllocSet)plansource->query_context)->freelist > >> $1 = {0x0, *0x5bdd3b8*, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0} > >> (gdb) p *((AllocSet)plansource->query_context)->freelist[1] > >> *$2 = {size = 10649824, aset = 0xa283c0 <AllocSetFree>}* > >> (gdb) p plansource->query_context->name > >> *$3 = 0xbfd929 "unnamed prepared statement"* > >> (gdb) x /10c plansource->query_context->name > >> 0xbfd929: 117 'u' 110 'n' 110 'n' 97 'a' 109 'm' 101 'e' 100 'd' 32 ' ' > >> 0xbfd931: 112 'p' 114 'r' > >> (gdb) quit > >> > >> > >> GDB 9.2: > >> (gdb) up 3 > >> #3 ResetPlanCache () at plancache.c:1922 > >> 1922 plancache.c: No such file or directory. > >> (gdb) p ((AllocSet)plansource->query_context)->freelist > >> $1 = {0x0, *0x5bdd3b8*, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0} > >> (gdb) p *((AllocSet)plansource->query_context)->freelist[1] > >> *$2 = {size = 16, aset = 0x0}* > >> (gdb) p plansource->query_context->name > >> *$3 = 0xbfd929 ""* > >> (gdb) x /10c plansource->query_context->name > >> 0xbfd929: 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 '\000' 0 > '\000' 0 > >> '\000' > >> 0xbfd931: 0 '\000' 0 '\000' > >> > >> > >> Any ideas? Thanks! > >> > >> -- > >> Best Regards > >> Andy Fan > >> > > > > Will it have something with compiler? The compiler I used > > to build the software (which generated the core file) is LLVM 6.0.0. > > At first glance, it sounds like a bug. Can you provide a reproducer? > > Simon > Hi Simon: Thanks for your reply! Actually I am debugging postgresql bug, however I can't reproduce the core at last, so the simple answer for your question is no, I can't provide the reproducer. I'm sorry about that. But if you want any further analysis on the current core file, I can try my best. -- Best Regards Andy Fan (https://www.aliyun.com/) ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Get Different Result for the same core file with different versions of gdb. 2021-02-03 2:56 ` Andy Fan @ 2021-02-03 15:29 ` Simon Marchi 0 siblings, 0 replies; 4+ messages in thread From: Simon Marchi @ 2021-02-03 15:29 UTC (permalink / raw) To: Andy Fan; +Cc: gdb > Hi Simon: > Thanks for your reply! Actually I am debugging postgresql bug, however > I can't reproduce the core at last, so the simple answer for your question is > no, I can't provide the reproducer. I'm sorry about that. But if you want any > further analysis on the current core file, I can try my best. I don't know core file handling well enough to provide you with precise instructions to guide you. If I had that it front of me, I would probably check which address GDB is trying to read (if it's the same in both cases). I would inspect the LOAD program headers of the core file, see what's the content at that address. If I find that GDB indeed is not reading the right content, I would try to bridge the gap between where LOAD program headers from the core file are processed and where memory is read in GDB, to try to find where the chain is broken. The relevant code for that is probably in gdb/corelow.c. Simon ^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-02-02 2:15 ` Get Different Result for the same core file with different versions of gdb Andy Fan
2021-02-02 15:30 ` Simon Marchi
2021-02-03 2:56 ` Andy Fan
2021-02-03 15:29 ` Simon Marchi
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