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| fabbione | jbehey dude | 03:10 |
|---|---|---|
| fabbione | whops | 03:10 |
| fabbione | jbailey: dude... | 03:10 |
| jbailey | fabbione: yayaya | 03:10 |
| jbailey | Fine, don't remember who I am. | 03:10 |
| jbailey | See if my feelings are hurt... 8'{ *cRy* | 03:10 |
| fabbione | (gdb) run | 03:10 |
| fabbione | Starting program: /root/a.out | 03:10 |
| fabbione | we are set | 03:10 |
| fabbione | Program received signal SIGUSR1, User defined signal 1. | 03:10 |
| fabbione | 0xf7e9536c in nanosleep () from /lib/v9v/libc.so.6 | 03:10 |
| fabbione | (gdb) next | 03:10 |
| fabbione | Single stepping until exit from function nanosleep, | 03:10 |
| fabbione | which has no line number information. | 03:10 |
| fabbione | Program terminated with signal SIGILL, Illegal instruction. | 03:10 |
| fabbione | The program no longer exists. | 03:10 |
| fabbione | (gdb) That was all, folks | 03:10 |
| fabbione | this is bad.. | 03:10 |
| fabbione | i can't figure why we are getting a SIGILL | 03:10 |
| fabbione | and only on Niagara machine | 03:10 |
| jbailey | SIGILL is a kernel or processor trap. | 03:11 |
| fabbione | i am afraid the last gcc updates are generating wrong code | 03:11 |
| fabbione | because it's not triggered on non Niagara machines | 03:11 |
| jbailey | That or the kernel is dissallowing something it should allow. | 03:11 |
| fabbione | and usually that's a sign of badly generated code | 03:11 |
| fabbione | unlikely | 03:11 |
| jbailey | Depends on how the protection bits all work on Sparc. | 03:11 |
| fabbione | i have seen a lot the other way around | 03:11 |
| jbailey | Is there a test failure in either LTP or glibc's testsuite for it? | 03:12 |
| fabbione | i have a reduced case | 03:12 |
| fabbione | and i am trying to reduce it even more | 03:12 |
| jbailey | Even better. =) | 03:12 |
| fabbione | no idea about LTP or glibc | 03:12 |
| fabbione | jbailey: can you get access to fluorine? | 03:12 |
| jbailey | Well, you're looking at a glibc function yes? | 03:12 |
| fabbione | from cr3? | 03:12 |
| jbailey | I can, but don't have time for 4 to 6 hours. | 03:13 |
| fabbione | i want to show you the code | 03:13 |
| fabbione | feh ok | 03:13 |
| jbailey | Sorry, my morning is lined up with customer appointments. | 03:13 |
| jbailey | Does your reduced testsuite still call nanosleep? | 03:13 |
| jbailey | Or have you extracted that out? | 03:13 |
| fabbione | i am pretty sure the problem is either gcc or binutils | 03:20 |
| fabbione | declaring an int foo; makes the code explode | 03:20 |
| fabbione | removing that line = works | 03:20 |
| fabbione | and that so should not happen | 03:20 |
| fabbione | root@fluorine:~# gcc -Wall -g -O0 main.c | 03:21 |
| fabbione | root@fluorine:~# ./a.out | 03:21 |
| fabbione | root@fluorine:~# gcc -Wall -g -O0 main.c | 03:21 |
| fabbione | main.c: In function 'main': | 03:21 |
| fabbione | main.c:36: warning: unused variable 'i' | 03:21 |
| fabbione | root@fluorine:~# ./a.out | 03:21 |
| fabbione | Illegal instruction | 03:21 |
| fabbione | doko: ping? | 03:21 |
| jbailey | Right, so once you've got that, do a disassemble and a stepi to find the offending instruction. | 03:23 |
| fabbione | do you recall the gdb sintax to do that? | 03:25 |
| jbailey | 'dis' I think. | 03:27 |
| fabbione | no that's disable.. | 03:28 |
| jbailey | Hmm, lemme look it up after this call. | 03:28 |
| fabbione | sure thanks | 03:28 |
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| jbailey | fabbione: disass | 03:41 |
| jbailey | You didn't try, did you? =) | 03:41 |
| jbailey | So break before the sigill. | 03:42 |
| jbailey | step to find the offending C statement. | 03:43 |
| jbailey | Do the disass there | 03:43 |
| jbailey | then stepi to the sigill. | 03:43 |
| fabbione | jbailey: ok | 03:47 |
| fabbione | dis was claiming disable.. but i might have been at the wrong point | 03:48 |
| fabbione | hoooowwwowowowoowow | 04:13 |
| fabbione | this is a mess | 04:13 |
| doko | fabbione: pong | 04:22 |
| fabbione | doko: do you have access to fluorine? | 04:22 |
| doko | no | 04:23 |
| fabbione | the T1000 at the london DC from -support? | 04:23 |
| fabbione | i was told you had acccess | 04:23 |
| doko | ohh right, didn't use it yet | 04:30 |
| fabbione | doko: see your email about that niagara test case | 04:39 |
| fabbione | it's possible to reproduce it on fluorine | 04:39 |
| fabbione | there is a feisty chroot in /src/chroots/feisty | 04:39 |
| fabbione | and the sources are in ~/root | 04:39 |
| doko | fabbione: could you check with gcc-4.2? | 04:40 |
| doko | what are working gcc/binutils versions? | 04:40 |
| fabbione | doko: i have been staring at that code for 10 hours now.. i can't look at it anylonger | 04:41 |
| fabbione | doko: i did test the latest in feisty... and no.. i didn't check back yet | 04:41 |
| fabbione | i thought it was a coding error | 04:41 |
| fabbione | but i just arrived at toolchain not too long ago when removing the int i; | 04:41 |
| fabbione | (unused) | 04:41 |
| fabbione | because i was killing code to the minimum to reduce the test case | 04:42 |
| fabbione | the original parted_server is 2200 lines :) | 04:42 |
| fabbione | also.. flourine has 32 threads.. it takes nothing to build gcc with make -j :) | 04:42 |
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