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seconds] 17:14:49 drmeister [~drmeister@farnsworth.chem.temple.edu] has joined #sbcl 17:16:01 antoszka [~antoszka@unaffiliated/antoszka] has joined #sbcl 17:26:05 -!- drmeister [~drmeister@farnsworth.chem.temple.edu] has quit [Remote host closed the connection] 17:26:43 drmeister [~drmeister@farnsworth.chem.temple.edu] has joined #sbcl 17:31:21 -!- drmeister [~drmeister@farnsworth.chem.temple.edu] has quit [Ping timeout: 272 seconds] 17:44:29 stassats [~stassats@wikipedia/stassats] has joined #sbcl 17:49:13 Sagane [~Sagane@177.100-226-89.dsl.completel.net] has joined #sbcl 17:52:59 -!- Bike [~Glossina@gannon-wless-gw.resnet.wsu.edu] has quit [Ping timeout: 246 seconds] 18:23:55 -!- Munksgaard [~philip@shop3.diku.dk] has quit [Ping timeout: 272 seconds] 18:27:09 drmeister [~drmeister@farnsworth.chem.temple.edu] has joined #sbcl 18:29:50 scymtym_: it's a bit eleventh hour to ask this, but you don't happen to have an easy-drop-in test for the new restart behaviour (with :test)? 18:31:41 -!- drmeister [~drmeister@farnsworth.chem.temple.edu] has quit [Ping timeout: 245 seconds] 18:34:38 -!- jaimef [jaimef@dns.mauthesis.com] has quit [Excess Flood] 18:40:58 jaimef [jaimef@dns.mauthesis.com] has joined #sbcl 18:54:05 -!- attila_lendvai [~attila_le@unaffiliated/attila-lendvai/x-3126965] has quit [Read error: Connection reset by peer] 18:54:28 attila_lendvai [~attila_le@95.56.72.194] has joined #sbcl 18:54:28 -!- attila_lendvai [~attila_le@95.56.72.194] has quit [Changing host] 18:54:28 attila_lendvai [~attila_le@unaffiliated/attila-lendvai/x-3126965] has joined #sbcl 18:56:00 -!- chris_l [~quassel@p57A5CD0B.dip0.t-ipconnect.de] has quit [Remote host closed the connection] 19:04:16 Krystof: let me check 19:07:56 would the recipe in 19:07:58 lp 774410 19:07:58 https://bugs.launchpad.net/bugs/774410 19:07:59 work? 19:13:17 ehaliewicz [~user@50-0-51-11.dsl.static.sonic.net] has joined #sbcl 19:17:26 huh, yes 19:17:33 now I look like an idiot 19:17:43 serves me right for running around like a headless chicken :-/ 19:17:53 no, i should have included that in the patch 19:20:51 by the magic of git commit --amend, it will appear as if you included it in the patch :-) 19:21:16 sdemarre [~serge@91.180.105.157] has joined #sbcl 19:21:56 wait, you did 19:22:16 where did those tests come from? 19:22:34 I am so confused now 19:22:56 you managed to confuse me as well :) 19:23:43 the proper thing to do probably is giving credit to the original reporter for the test case 19:23:49 drmeister [~drmeister@farnsworth.chem.temple.edu] has joined #sbcl 19:28:04 Krystof: I think it'll be easier for me to write a mail filter than to figure out how to stop SF from emailing me about commits (because sbcl-commits isn't enough for admins, I suppose) 19:28:44 wait, behaviour has changed for yo? 19:28:48 "you", even 19:29:41 oh, you might want to look at https://sourceforge.net/auth/subscriptions/ 19:30:07 but I'd have to remember my password for that (: 19:30:18 ha 19:30:27 ok, freeze imminent 19:30:31 any last words? 19:44:40 -!- drmeister [~drmeister@farnsworth.chem.temple.edu] has quit [Remote host closed the connection] 19:45:16 drmeister [~drmeister@farnsworth.chem.temple.edu] has joined #sbcl 19:49:35 -!- drmeister [~drmeister@farnsworth.chem.temple.edu] has quit [Ping timeout: 245 seconds] 19:50:36 drmeister [~drmeister@farnsworth.chem.temple.edu] has joined #sbcl 20:01:41 -!- stassats [~stassats@wikipedia/stassats] has quit [Ping timeout: 245 seconds] 20:27:44 jweiss [jweiss@nat/redhat/x-byrbgveshbgvcqtb] has joined #sbcl 20:31:08 -!- sdemarre [~serge@91.180.105.157] has quit [Ping timeout: 240 seconds] 20:35:50 -!- angavrilov [~angavrilo@217.71.227.190] has quit [Remote host closed the connection] 20:48:38 -!- attila_lendvai [~attila_le@unaffiliated/attila-lendvai/x-3126965] has quit [Quit: Leaving.] 20:51:29 So, the problem occurs even on simple 20:51:40 (disassemble (lambda (x) (list x))) 20:52:21 Weird. 20:52:25 (disassemble (lambda (x) (list x))) ; works 20:52:31 (disassemble (lambda (x) (list x x))) ; doesn't 20:52:53 Any idea what might be broken? 20:52:56 -!- drmeister [~drmeister@farnsworth.chem.temple.edu] has quit [Remote host closed the connection] 21:02:18 works both here 21:02:39 on 1.1.8 21:02:57 This is today's snapshot. 21:04:35 by the way what style is the lisp disassembly asembler lines ? at&t ? intel ? 21:05:19 did you compile it yourself ? 21:05:22 on your platform ? 21:05:47 from an old sbcl binary or the binary from sourceforge ? 21:06:26 Yes, I compile it myself. 21:06:42 well ok then 21:06:51 SBCL compiles itself twice, so it doesn't matter how it is built. 21:06:55 It shouldn't at least. 21:07:08 like i said on 1.1.8 it works...... 21:08:29 Fare [~fare@216.239.55.52] has joined #sbcl 21:16:01 ASau: is this NetBSD? 21:16:47 -!- prxq [~mommer@x2f6cdab.dyn.telefonica.de] has quit [Quit: Leaving] 21:17:01 what's the failure mode? 21:17:03 Krystof: NetBDS/i486. 21:17:19 -!- Sagane [~Sagane@177.100-226-89.dsl.completel.net] has quit [Read error: Connection reset by peer] 21:17:30 I have the following one-string file: 21:17:32 (disassemble (lambda (x) (list x x))) 21:17:41 With this command: 21:17:52 sbcl --no-userinit --load bug.lisp --quit 21:17:58 It doesn't terminate. 21:18:12 If I make it read 21:18:13 (disassemble (lambda (x) (list x))) 21:18:19 it does terminate, as expected. 21:19:00 I can simplify it to standalone commands: 21:19:02 sbcl --no-userinit --eval "(disassemble (lambda (x) (list x)))" --quit 21:19:05 sbcl --no-userinit --eval "(disassemble (lambda (x) (list x x)))" --quit 21:19:17 The first one terminates, the second one doesn't. 21:19:45 Do you have suggestions what to check? 21:20:04 Other than "everything", preferably. :) 21:20:15 -!- jweiss [jweiss@nat/redhat/x-byrbgveshbgvcqtb] has quit [Ping timeout: 272 seconds] 21:20:38 -!- danlentz [~danlentz@c-68-37-70-235.hsd1.nj.comcast.net] has quit [Remote host closed the connection] 21:25:17 scymtym [~user@ip-5-147-115-29.unitymediagroup.de] has joined #sbcl 21:27:32 Asau: probably logic around calculating disassembly annotations 21:27:53 does the non-terminating one print anything? 21:28:10 Krystof: i think i started seeing disassembly-related test failures a few days ago; see my memo for stassats maybe two days ago 21:28:18 maybe that's related somehow 21:28:26 -!- fikusz [~fikusz@catv-89-132-137-62.catv.broadband.hu] has quit [Ping timeout: 264 seconds] 21:28:43 Krystof: yes, it prints disassembly, and then gets stuck. 21:29:06 how much disassembly? What is the last line printed? 21:29:06 Do you need the output? 21:29:19 ASau: I'm trying to help you debug the problem 21:29:24 me looking at it probably won't help much 21:29:24 Last two lines: 21:29:24 ; 8A: 18 BYTE #X18 ; INVALID-ARG-COUNT-ERROR 21:29:24 ; 8B: 8F BYTE #X8F ; ECX 21:29:57 compare the last line printed in the not working one with the working one -- what comes afterwards? 21:30:38 Working example finishes with lines: 21:30:39 ; 48: 18 BYTE #X18 ; INVALID-ARG-COUNT-ERROR 21:30:39 ; 49: 8F BYTE #X8F ; ECX 21:30:46 scymtym: maybe, though disassembly on some platforms has been broken for a while; I think people keep on wanting me to turn off sb-sprof tests 21:30:57 hm, that's a surprise 21:31:04 It feeds line correctly and terminates. 21:31:46 Krystof: yes, I turn them off. 21:31:49 can you interrupt the hanging one? 21:31:55 and look at the backtrace? 21:31:58 Which way? 21:32:09 any way that gives you some indication of what it's doing 21:32:10 Run it within gdb and send SIGINT? 21:32:16 or just hit C-c 21:32:42 I mean, this is debugging 101: you need to find out what it's doing when it's spinning 21:32:47 maybe you have better ways of doing that 21:32:56 you could trace most of the functions in SB-DISASSEM 21:33:29 Yeah, I know. 21:33:33 (side note: in the UK we don't really have the concept of 101 apart from Orwell's Room 101.) 21:33:41 The problem is that SBCL is different. :) 21:34:21 Krystof, what's in your room 101 as a SBCL developer? 21:35:06 Krystof: I don't quite understand it. 21:35:23 I attach to the process from gdb, but all I can see is 21:35:33 #0 0xbbbfa637 in ___lwp_park50 () from /usr/libexec/ld.elf_so 21:35:33 #1 0xbbbf28c7 in _rtld_exclusive_enter () from /usr/libexec/ld.elf_so 21:35:33 #2 0x00000000 in ?? () 21:35:48 ASau: so if interrupting SBCL while it's spinning doesn't give you a debugger from which you can get a backtrace doing (trace "SB-DISASSEM") before running your buggy form might be helpful 21:35:57 ASau: no, a backtrace from the Lisp debugger 21:36:00 Ah. 21:36:07 No, I can only KILL it. 21:36:14 It doesn't respond to INT. 21:36:30 Not to ABRT either. 21:36:41 if I had to guess, what is happening is that the disassembler is somehow trying to annotate some disassembly as if it was a memory reference 21:36:54 but it isn't, and that memory reference triggers a memory fault 21:36:58 Alright, I've got it, trying trace. 21:37:02 and that memory fault for whatever reason isn't handled correctly 21:37:18 this is a complete guess and I'm not confident in it enough to prepare for a "psychic debugging" victory dance 21:37:25 particularly since it is substantially past my bedtime 21:38:24 Well... There's a lot of trace... 21:38:40 What should I look for? 21:38:48 Last forms? 21:39:20 yes 21:39:33 anything that has been called but not returned 21:39:44 4: SB-DISASSEM:PRINT-NOTES-AND-NEWLINE returned NIL 21:39:44 3: SB-DISASSEM:MAP-SEGMENT-INSTRUCTIONS returned NIL 21:39:44 2: SB-DISASSEM:DISASSEMBLE-SEGMENT returned NIL 21:39:44 1: SB-DISASSEM:DISASSEMBLE-SEGMENTS returned NIL 21:39:47 0: SB-DISASSEM:DISASSEMBLE-FUN returned NIL 21:39:58 um, but that is the end 21:40:17 has it also terminated nicely? 21:40:31 No. 21:40:50 It spins as usually. 21:41:52 well that is very neat 21:42:01 I think you might be into wizard territory there 21:42:20 Yeah, and I don't quite like it. 21:42:50 ok, so, the next thing to suggest is a bit involved and fiddly 21:42:58 I think what you need to do is 21:43:29 (1) start an sbcl repl (2) attach gdb to the running process, and let it continue (3) type (disassemble '(lambda (x) (list x x))) at the sbcl repl (4) observe what the gdb says 21:44:00 Alright, doing that. 21:46:24 SEGV. 21:46:38 yay, so I was probably partly right, maybe 21:46:42 Bike [~Glossina@wl-nat101.it.wsu.edu] has joined #sbcl 21:46:45 Backtrace is... well... 21:46:50 Informative. 21:47:06 #10 0x6001c9eb in ?? () 21:47:07 #11 0x6001c763 in ?? () 21:47:07 #12 0x0806141b in Ldone () at x86-assem.S:448 21:47:07 #13 0x60002975 in ?? () 21:47:10 Backtrace stopped: frame did not save the PC 21:47:21 haha 21:47:21 oh, no, that SEGV is probably normal 21:47:53 Alright, I can continue for some time. 21:48:15 on noez someone botched the sembler 21:48:17 we're interested in the first signal after the last correctly-printed disassembly lines 21:48:40 it took about 15 or so continues on this x86 build I have here 21:49:12 (the SEGVs are from the dirty page marker system in the garbage collector) 21:49:32 so it got gc'ed ? 21:50:10 Hm. 21:50:16 oO 21:50:35 It got through, printed prompt, and is able to evaluate forms. 21:50:42 excellent! Problem solved :-) 21:51:30 Yeah, but I don't like this solution. :) 21:51:35 so what ? 21:51:41 turned the gc off ? 21:52:02 dcooper8 [~dcooper8@c-98-250-10-50.hsd1.mi.comcast.net] has joined #sbcl 21:52:08 used (without-gcing .... ? 21:52:29 or what did you change ? 21:52:31 oleo: at this point, you are not helping 21:52:46 i was asking not helping! 21:52:59 what the problem was! 21:53:14 your asking is not helpful 21:53:27 Krystof: do you suspect signal handling? 21:53:45 I do. I think the next thing I would do is modify the runtime signal handlers to print their arguments 21:53:58 Uff! 21:54:02 yeah 21:54:04 sorry 21:54:05 That will take a while. 21:54:18 luckily, it's my bedtime, so by the time I wake up it'll all be done ;-) 21:54:23 Can you give me file names, if you remember them? 21:54:23 good luck 21:54:32 If not, alright... 21:54:48 Good night! 21:55:10 src/runtime/bsd-os.c 21:55:14 Thanks! 21:55:15 memory_fault_handler 21:56:26 More thanks! 21:58:19 something else has occurred to me: an alternative hypothesis 21:58:31 symptoms a bit like this could happen if something violates the ABI 21:58:43 for example, if something is not clearing a flag as it should, such as the direction flag 21:59:00 if you'd asked me I would have said that we fixed all of those things a long time ago, but maybe not 22:02:21 more good luck 22:02:44 -!- psilord [~pkeller@23-25-144-217-static.hfc.comcastbusiness.net] has quit [Quit: Leaving.] 22:12:27 drmeister [~drmeister@166.216.136.196] has joined #sbcl 22:30:44 ASau: if you can bisect, that might be helpful. 22:33:14 -!- drmeister [~drmeister@166.216.136.196] has quit [Read error: Connection reset by peer] 22:35:11 pkhuong: it takes really long, plus tests are broken for a very long time. 22:36:04 BTW, is this intended: 22:36:06 gencgc.c:2061:5: warning: passing argument 1 of 'looks_like_valid_lisp_pointer_p' makes integer from pointer without a cast 22:36:06 gc-internal.h:160:12: note: expected 'lispobj' but argument is of type 'lispobj *' 22:37:56 ASau: turn tests off. 22:38:06 ASau: most probably. 22:41:43 -!- dcooper8 [~dcooper8@c-98-250-10-50.hsd1.mi.comcast.net] has quit [Quit: dcooper8] 22:46:49 drmeister [~drmeister@pool-173-59-25-58.phlapa.fios.verizon.net] has joined #sbcl 22:52:40 psilord [~psilord@c-69-180-173-249.hsd1.mn.comcast.net] has joined #sbcl 23:18:25 -!- segv- [~mb@95-91-243-227-dynip.superkabel.de] has quit [Ping timeout: 272 seconds] 23:19:16 -!- drmeister [~drmeister@pool-173-59-25-58.phlapa.fios.verizon.net] has quit [Remote host closed the connection] 23:38:40 drmeister [~drmeister@pool-173-59-25-58.phlapa.fios.verizon.net] has joined #sbcl 23:47:11 -!- Bike [~Glossina@wl-nat101.it.wsu.edu] has quit [Ping timeout: 272 seconds] 23:47:38 Bike [~Glossina@69.166.47.101] has joined #sbcl 23:51:50 -!- Bike [~Glossina@69.166.47.101] has quit [Ping timeout: 240 seconds]