* [Qemu-devel] qemu on centos @ 2011-12-23 12:44 Reed Kotler 2011-12-23 13:25 ` [Qemu-devel] [target-mips] " Andreas Färber 0 siblings, 1 reply; 3+ messages in thread From: Reed Kotler @ 2011-12-23 12:44 UTC (permalink / raw) To: qemu-devel We have been seeing various problems running qemu for MIPS target on Centos 5. We are running linux user mode programs. Qemu segfaults. We recently tried upgrading to Centos 6 and the problem there is much worse, making it basically unusable. The same programs have no problem when running on Ubuntu. Is this a known problem? Any ideas? TIA. Reed ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [target-mips] qemu on centos 2011-12-23 12:44 [Qemu-devel] qemu on centos Reed Kotler @ 2011-12-23 13:25 ` Andreas Färber 0 siblings, 0 replies; 3+ messages in thread From: Andreas Färber @ 2011-12-23 13:25 UTC (permalink / raw) To: Reed Kotler; +Cc: Richard Sandiford, Khansa Butt, qemu-devel, Richard Henderson Hi, Am 23.12.2011 13:44, schrieb Reed Kotler: > We have been seeing various problems running qemu for MIPS target on > Centos 5. > We are running linux user mode programs. > > Qemu segfaults. > > We recently tried upgrading to Centos 6 and the problem there is much > worse, making it basically unusable. > > The same programs have no problem when running on Ubuntu. They likely are using different QEMU versions, and distros may have different patches applied on top. Please provide some more info on what version, what ABI (which executable), what -cpu parameter (if any), etc. you are using. Does a gdb backtrace indicate any QEMU function or is it from translated code? For n64 there were some patches in need of testing, review and fixing. [cc'ing Khansa] For n32 there's signal handling missing. (openSUSE for one ignores the build warning and provides it non the less.) No known issues specific to o32 that I'm aware of, but the two Richards had patches for some instructions. Shouldn't lead to segfaults though. Regards, Andreas -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <4EF4B3C0.8030204@mips.com>]
* Re: [Qemu-devel] Fwd: Re: [target-mips] qemu on centos [not found] <4EF4B3C0.8030204@mips.com> @ 2011-12-23 18:05 ` Brendan Kirby 2011-12-23 22:57 ` Stefan Weil 0 siblings, 1 reply; 3+ messages in thread From: Brendan Kirby @ 2011-12-23 18:05 UTC (permalink / raw) To: Reed Kotler, afaerber, qemu-devel, khansa, rth, rdsandiford; +Cc: ahatanaka [-- Attachment #1: Type: text/plain, Size: 2309 bytes --] Attached are three MIPS binaries that I have seen segfault intermittently on CentOS 6 machines. Just run them with no arguments several times. Brendan On Fri, 2011-12-23 at 09:00 -0800, Reed Kotler wrote: > > Please work with this guy. > > If possible, submit some test cases to them of some code that causes > segfaults on Centos 6, even if intermittent. > > Reed > > -------- Original Message -------- > Subject: > Re: [Qemu-devel] [target-mips] qemu > on centos > Date: > Fri, 23 Dec 2011 14:25:57 +0100 > From: > Andreas Färber <afaerber@suse.de> > Organization: > SUSE LINUX Products GmbH > To: > Reed Kotler <rkotler@mips.com> > CC: > <qemu-devel@nongnu.org>, Khansa > Butt <khansa@kics.edu.pk>, Richard > Henderson <rth@twiddle.net>, > Richard Sandiford > <rdsandiford@googlemail.com> > > > Hi, > > Am 23.12.2011 13:44, schrieb Reed Kotler: > > We have been seeing various problems running qemu for MIPS target on > > Centos 5. > > We are running linux user mode programs. > > > > Qemu segfaults. > > > > We recently tried upgrading to Centos 6 and the problem there is much > > worse, making it basically unusable. > > > > The same programs have no problem when running on Ubuntu. > > They likely are using different QEMU versions, and distros may have > different patches applied on top. > Please provide some more info on what version, what ABI (which > executable), what -cpu parameter (if any), etc. you are using. Does a > gdb backtrace indicate any QEMU function or is it from translated code? > > For n64 there were some patches in need of testing, review and fixing. > [cc'ing Khansa] > > For n32 there's signal handling missing. (openSUSE for one ignores the > build warning and provides it non the less.) > > No known issues specific to o32 that I'm aware of, but the two Richards > had patches for some instructions. Shouldn't lead to segfaults though. > > Regards, > Andreas > > -- > SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany > GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg [-- Attachment #2: ReedSolomon.mipsgcc --] [-- Type: application/x-executable, Size: 16759 bytes --] [-- Attachment #3: bisort.llc.mips32r2 --] [-- Type: application/x-executable, Size: 12406 bytes --] [-- Attachment #4: bisort.mipsgcc --] [-- Type: application/x-executable, Size: 13350 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] Fwd: Re: [target-mips] qemu on centos 2011-12-23 18:05 ` [Qemu-devel] Fwd: " Brendan Kirby @ 2011-12-23 22:57 ` Stefan Weil 2011-12-23 23:27 ` [Qemu-devel] " Stefan Weil 0 siblings, 1 reply; 3+ messages in thread From: Stefan Weil @ 2011-12-23 22:57 UTC (permalink / raw) To: Brendan Kirby; +Cc: qemu-devel Am 23.12.2011 19:05, schrieb Brendan Kirby: > Attached are three MIPS binaries that I have seen segfault > intermittently on CentOS 6 machines. Just run them with no arguments > several times. > > Brendan > > On Fri, 2011-12-23 at 09:00 -0800, Reed Kotler wrote: >> >> Please work with this guy. >> >> If possible, submit some test cases to them of some code that causes >> segfaults on Centos 6, even if intermittent. >> >> Reed >> >> -------- Original Message -------- >> Subject: >> Re: [Qemu-devel] [target-mips] qemu >> on centos >> Date: >> Fri, 23 Dec 2011 14:25:57 +0100 >> From: >> Andreas Färber <afaerber@suse.de> >> Organization: >> SUSE LINUX Products GmbH >> To: >> Reed Kotler <rkotler@mips.com> >> CC: >> <qemu-devel@nongnu.org>, Khansa >> Butt <khansa@kics.edu.pk>, Richard >> Henderson <rth@twiddle.net>, >> Richard Sandiford >> <rdsandiford@googlemail.com> >> >> >> Hi, >> >> Am 23.12.2011 13:44, schrieb Reed Kotler: >>> We have been seeing various problems running qemu for MIPS target on >>> Centos 5. >>> We are running linux user mode programs. >>> >>> Qemu segfaults. >>> >>> We recently tried upgrading to Centos 6 and the problem there is much >>> worse, making it basically unusable. >>> >>> The same programs have no problem when running on Ubuntu. >> >> They likely are using different QEMU versions, and distros may have >> different patches applied on top. >> Please provide some more info on what version, what ABI (which >> executable), what -cpu parameter (if any), etc. you are using. Does a >> gdb backtrace indicate any QEMU function or is it from translated code? >> >> For n64 there were some patches in need of testing, review and fixing. >> [cc'ing Khansa] >> >> For n32 there's signal handling missing. (openSUSE for one ignores the >> build warning and provides it non the less.) >> >> No known issues specific to o32 that I'm aware of, but the two Richards >> had patches for some instructions. Shouldn't lead to segfaults though. >> >> Regards, >> Andreas >> >> -- >> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany >> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg > Please add your message at the bottom of the mail, not at the top. I tried your binaries with latest QEMU. All three fail here each time with SIGSEGV. This is caused by a jump to address 0 (pc = 0). Up to now I don't know the reason for this jump. Call stack: #0 0x00005555555f62d2 in ldl_le_p (ptr=0x0) at /home/stefan/src/qemu/qemu.org/qemu/bswap.h:477 #1 0x000055555561333e in gen_intermediate_code_internal (env=0x555557ca0b10, tb=0x7ffff3982108, search_pc=0) at /home/stefan/src/qemu/qemu.org/qemu/target-mips/translate.c:12442 #2 0x0000555555613709 in gen_intermediate_code (env=0x555557ca0b10, tb=0x7ffff3982108) at /home/stefan/src/qemu/qemu.org/qemu/target-mips/translate.c:12528 #3 0x00005555555f5f8d in cpu_mips_gen_code (env=0x555557ca0b10, tb=0x7ffff3982108, gen_code_size_ptr=0x7fffffffd748) at /home/stefan/src/qemu/qemu.org/qemu/translate-all.c:66 #4 0x00005555555a33b3 in tb_gen_code (env=0x555557ca0b10, pc=0, cs_base=0, flags=34, cflags=0) at /home/stefan/src/qemu/qemu.org/qemu/exec.c:1003 #5 0x000055555559c5b2 in tb_find_slow (env=0x555557ca0b10, pc=0, cs_base=0, flags=34) at /home/stefan/src/qemu/qemu.org/qemu/cpu-exec.c:126 #6 0x000055555559c73c in tb_find_fast (env=0x555557ca0b10) at /home/stefan/src/qemu/qemu.org/qemu/cpu-exec.c:153 #7 0x000055555559cb2a in cpu_mips_exec (env=0x555557ca0b10) at /home/stefan/src/qemu/qemu.org/qemu/cpu-exec.c:536 #8 0x00005555555bf780 in cpu_loop (env=0x555557ca0b10) at /home/stefan/src/qemu/qemu.org/qemu/linux-user/main.c:2160 #9 0x00005555555c16ac in main (argc=7, argv=0x7fffffffe1c8, envp=0x7fffffffe208) at /home/stefan/src/qemu/qemu.org/qemu/linux-user/main.c:3812 Try running a working version and the bad version with mipsel-linux-user/qemu-mipsel -d in_asm,cpu -singlestep ... and compare the resulting output file /tmp/qemu.log. For programs without external events (timers and other interrupt sources), the program flow should be identical (same instructions, same register values). This should identify the mips code which is handled differently by the two versions. Here is an extract of my qemu.log which shows the jump to address 0. pc=0x004027d8 HI=0x0000018a LO=0x0000f816 ds 0022 004027c0 0 GPR00: r0 00000000 at fffffff8 v0 4081190c v1 00000814 GPR04: a0 0040248c a1 00000001 a2 4080042c a3 00402650 GPR08: t0 004026f4 t1 0ffffffe t2 00000063 t3 00000002 GPR12: t4 40800180 t5 40800228 t6 ffffffff t7 00400538 GPR16: s0 4083a010 s1 004004f0 s2 00000000 s3 00000000 GPR20: s4 00000000 s5 00000000 s6 00000000 s7 00000000 GPR24: t8 00000002 t9 00000000 k0 00000000 k1 00000000 GPR28: gp 00412804 sp 40800408 s8 00000000 ra 00400538 CP0 Status 0x00000000 Cause 0x00000000 EPC 0x00000000 Config0 0x80000482 Config1 0x9e190c8f LLAddr 0xffffffff CP1 FCR0 0x00000000 FCR31 0x00000000 SR.FR 0 fp_status 0x00 f0: w:3f800000 d:400000003f800000 fd: 4.61169e+18 fs: 1.06535e+09 psu: 1.07374e+09 f2: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f4: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f6: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f8: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f10: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f12: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f14: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f16: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f18: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f20: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f22: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f24: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f26: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f28: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f30: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 IN: 0x004027d8: jalr t9 An older qemu-mipsel from August fails, too. Regards, Stefan Weil ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [target-mips] qemu on centos 2011-12-23 22:57 ` Stefan Weil @ 2011-12-23 23:27 ` Stefan Weil 0 siblings, 0 replies; 3+ messages in thread From: Stefan Weil @ 2011-12-23 23:27 UTC (permalink / raw) To: Brendan Kirby; +Cc: Riku Voipio, qemu-devel, Aurelien Jarno Am 23.12.2011 23:57, schrieb Stefan Weil: > Am 23.12.2011 19:05, schrieb Brendan Kirby: >> Attached are three MIPS binaries that I have seen segfault >> intermittently on CentOS 6 machines. Just run them with no arguments >> several times. >> >> Brendan >> > I tried your binaries with latest QEMU. All three fail here each time > with SIGSEGV. This is caused by a jump to address 0 (pc = 0). > Up to now I don't know the reason for this jump. [snip] > An older qemu-mipsel from August fails, too. > > Regards, > Stefan Weil A version from May is better: it also has a jump to address 0, but handles it correctly: qemu-mipsel -L /media/vm/tftpboot/mips/malta-le mipsbin/bisort.llc.mips32r2 qemu: unhandled CPU exception 0xc - aborting pc=0x00000000 HI=0x0000018a LO=0x0000f816 ds 0022 00000000 0 GPR00: r0 00000000 at fffffff8 v0 4081190c v1 00000814 GPR04: a0 0040107c a1 00000001 a2 4080043c a3 004012a0 GPR08: t0 00401344 t1 0ffffffe t2 00000063 t3 00000002 GPR12: t4 40800190 t5 40800238 t6 ffffffff t7 004006a8 GPR16: s0 4083a010 s1 00400660 s2 00000000 s3 00000000 GPR20: s4 00000000 s5 00000000 s6 00000000 s7 00000000 GPR24: t8 00000000 t9 00000000 k0 00000000 k1 00000000 GPR28: gp 00411544 sp 40800418 s8 00000000 ra 00401520 CP0 Status 0x00000000 Cause 0x00000000 EPC 0x00000000 Config0 0x80000482 Config1 0x9e190c8f LLAddr 0xffffffff CP1 FCR0 0x00000000 FCR31 0x00000000 SR.FR 0 fp_status 0x00 f0: w:3f800000 d:400000003f800000 fd: 4.61169e+18 fs: 1.06535e+09 psu: 1.07374e+09 f2: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f4: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f6: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f8: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f10: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f12: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f14: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f16: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f18: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f20: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f22: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f24: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f26: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f28: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 f30: w:00000000 d:0000000000000000 fd: 0 fs: 0 psu: 0 qemu: uncaught target signal 6 (Aborted) - core dumped Obviously signal handling for SIGSEGV in user code changed. It now raises a SIGSEGV on the host... Merry Christmas Stefan Weil ^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-12-23 12:44 [Qemu-devel] qemu on centos Reed Kotler
2011-12-23 13:25 ` [Qemu-devel] [target-mips] " Andreas Färber
[not found] <4EF4B3C0.8030204@mips.com>
2011-12-23 18:05 ` [Qemu-devel] Fwd: " Brendan Kirby
2011-12-23 22:57 ` Stefan Weil
2011-12-23 23:27 ` [Qemu-devel] " Stefan Weil
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