* Re: KVM 12 and BUG with preempt kernel [not found] ` <45B72AC3.5050201-atKUWr5tajBWk0Htik3J/w@public.gmane.org> @ 2007-01-24 10:47 ` roucaries bastien [not found] ` <195c7a900701240247h3f478462w6f0d0c565550c480-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 0 siblings, 1 reply; 6+ messages in thread From: roucaries bastien @ 2007-01-24 10:47 UTC (permalink / raw) To: Avi Kivity; +Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f teThis time cc kvm-devel Problem summary: My host kernel oops: Unable to handle kernel paging request at 00000000b7f8143d RIP: > > [<ffffffff88376d73>] :kvm:paging32_gva_to_gpa+0x43/0x120 On 1/24/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote: > roucaries bastien wrote: > > Hi, > > > > First thank for your nice piece of software kvm. > > However I have to report some bugs and oops on the host side > > that seems to be related to preempt: > > Please post bugs to kvm-devel or to the sourceforge bug tracker. > > > > ----------------------------------------------------------------------------------------------------------------- > > > > Unable to handle kernel paging request at 00000000b7f8143d RIP: > > [<ffffffff88376d73>] :kvm:paging32_gva_to_gpa+0x43/0x120 > > Does the attached patch fix the bug? It seems yes (10 boots). Nethertheless I think it is time to report another bug (present without this patch therefore unrelated). Unfortunatly I have no trace because it crash my machine and I do not manage to find it. If I booot my debian guest with framebuffer activated after 20s to 15 minutes I see on my host screen a cloud of colorfull pixel. These pixel flash and seems related to guest frame buffer (same colors scheme but because it not the same resolution I can't read it). About 3s latter my box crash and is dead (cap lock does not even toggles the keyboard led). Therefore it seems that the guest achieve to write the host memory :-(, the good point is that he does not poke to my hard drive registers. This behavior is 100% reproductible. If I run the host and I switch to the text console I can't even get a trace because the screen is corrupted. Unfortunatly I have no serial port on this box (laptop). >Index: paging_tmpl.h >=================================================================== >--- paging_tmpl.h (revision 4320) >+++ paging_tmpl.h (working copy) >@@ -443,31 +443,17 @@ >static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) > { struct guest_walker walker; - pt_element_t guest_pte; - gpa_t gpa; + gpa_t gpa = UNMAPPED_GVA; + int r; - FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); - guest_pte = *walker.ptep; - FNAME(release_walker)(&walker); + r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); - if (!is_present_pte(guest_pte)) - return UNMAPPED_GVA; - - if (walker.level == PT_DIRECTORY_LEVEL) { - ASSERT((guest_pte & PT_PAGE_SIZE_MASK)); - ASSERT(PTTYPE == 64 || is_pse(vcpu)); - - gpa = (guest_pte & PT_DIR_BASE_ADDR_MASK) | (vaddr & - (PT_LEVEL_MASK(PT_PAGE_TABLE_LEVEL) | ~PAGE_MASK)); - - if (PTTYPE == 32 && is_cpuid_PSE36()) - gpa |= (guest_pte & PT32_DIR_PSE36_MASK) << - (32 - PT32_DIR_PSE36_SHIFT); - } else { - gpa = (guest_pte & PT_BASE_ADDR_MASK); - gpa |= (vaddr & ~PAGE_MASK); + if (r) { + gpa = (gpa_t)walker.gfn << PAGE_SHIFT; + gpa |= vaddr & ~PAGE_MASK; } + FNAME(release_walker)(&walker); return gpa; } ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ^ permalink raw reply [flat|nested] 6+ messages in thread
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* Re: KVM 12 and BUG with preempt kernel [not found] ` <195c7a900701240247h3f478462w6f0d0c565550c480-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> @ 2007-01-24 13:24 ` Avi Kivity [not found] ` <45B75E19.7070803-atKUWr5tajBWk0Htik3J/w@public.gmane.org> 0 siblings, 1 reply; 6+ messages in thread From: Avi Kivity @ 2007-01-24 13:24 UTC (permalink / raw) To: roucaries bastien; +Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f roucaries bastien wrote: > > It seems yes (10 boots). Good. I'll commit the patch. > Nethertheless I think it is time to report > another bug (present without this patch therefore unrelated). > Unfortunatly I have no trace because it crash my machine and I do not > manage to find it. > > If I booot my debian guest with framebuffer activated after 20s to 15 > minutes I see on my host screen a cloud of colorfull pixel. These > pixel flash and seems related to guest frame buffer (same colors > scheme but because it not the same resolution I can't read it). About > 3s latter my box crash and is dead (cap lock does not even toggles the > keyboard led). Therefore it seems that the guest achieve to write the > host memory :-(, the good point is that he does not poke to my hard > drive registers. > > This behavior is 100% reproductible. If I run the host and I switch to > the text console I can't even get a trace because the screen is > corrupted. You can start the guest in vnc mode (-vnc 1), so the host can remain in text mode, or use netconsole. Alternatively, please post exact instructions for reproducing. >> Index: paging_tmpl.h >> =================================================================== >> --- paging_tmpl.h (revision 4320) >> +++ paging_tmpl.h (working copy) >> @@ -443,31 +443,17 @@ >> static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) >> { > struct guest_walker walker; > - pt_element_t guest_pte; > - gpa_t gpa; > + gpa_t gpa = UNMAPPED_GVA; > + int r; > > - FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); > - guest_pte = *walker.ptep; > - FNAME(release_walker)(&walker); > + r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); > > - if (!is_present_pte(guest_pte)) > - return UNMAPPED_GVA; > - > - if (walker.level == PT_DIRECTORY_LEVEL) { > - ASSERT((guest_pte & PT_PAGE_SIZE_MASK)); > - ASSERT(PTTYPE == 64 || is_pse(vcpu)); > - > - gpa = (guest_pte & PT_DIR_BASE_ADDR_MASK) | (vaddr & > - (PT_LEVEL_MASK(PT_PAGE_TABLE_LEVEL) | > ~PAGE_MASK)); > - > - if (PTTYPE == 32 && is_cpuid_PSE36()) > - gpa |= (guest_pte & PT32_DIR_PSE36_MASK) << > - (32 - PT32_DIR_PSE36_SHIFT); > - } else { > - gpa = (guest_pte & PT_BASE_ADDR_MASK); > - gpa |= (vaddr & ~PAGE_MASK); > + if (r) { > + gpa = (gpa_t)walker.gfn << PAGE_SHIFT; > + gpa |= vaddr & ~PAGE_MASK; > } > > + FNAME(release_walker)(&walker); > return gpa; > } -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ^ permalink raw reply [flat|nested] 6+ messages in thread
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* Re: KVM 12 and BUG with preempt kernel [not found] ` <45B75E19.7070803-atKUWr5tajBWk0Htik3J/w@public.gmane.org> @ 2007-01-24 16:10 ` roucaries bastien [not found] ` <195c7a900701240810n2c85c125ubad5ec6baa643fd8-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 0 siblings, 1 reply; 6+ messages in thread From: roucaries bastien @ 2007-01-24 16:10 UTC (permalink / raw) To: Avi Kivity; +Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f On 1/24/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote: > roucaries bastien wrote: > > > > It seems yes (10 boots). > > Good. I'll commit the patch. > > > Nethertheless I think it is time to report > > another bug (present without this patch therefore unrelated). > > Unfortunatly I have no trace because it crash my machine and I do not > > manage to find it. > > > > If I booot my debian guest with framebuffer activated after 20s to 15 > > minutes I see on my host screen a cloud of colorfull pixel. These > > pixel flash and seems related to guest frame buffer (same colors > > scheme but because it not the same resolution I can't read it). About > > 3s latter my box crash and is dead (cap lock does not even toggles the > > keyboard led). Therefore it seems that the guest achieve to write the > > host memory :-(, the good point is that he does not poke to my hard > > drive registers. > > > > This behavior is 100% reproductible. If I run the host and I switch to > > the text console I can't even get a trace because the screen is > > corrupted. > > > You can start the guest in vnc mode (-vnc 1), so the host can remain in > text mode, or use netconsole. The problem is not switching between x and console but read the oops because kvm write to video mem :-(. And I do not think netconsole could help because my computer does not answer to irq, I suspect something nasty. The only think that could help is nmi watchdog but unfortunatly the bios declare timer interupt as XT-pic and not io-apic (bios bug forwaded to asus), therefore no nmi. Moreover I try vnc switch and kvm is stable, stange isn't. To reproduce: - use an preempt host kernel on amd64, kvm compiled as x86_64 - install a testing debian on a guest using sdl display, use framebuffer install (default) - wait.... - when you see colorfull pixel on the top of your sceen, kill kvm (kill only accelerate the crash) - wait 1s - kernel will crash I suspect I am seeing this colorfull pixel because I use a vesa driver on X and the guest write to it. But I do not understand why because lspci of guest say: 00:02.0 VGA compatible controller: Cirrus Logic GD 5446 (prog-if 00 [VGA]) Flags: bus master, fast devsel, latency 0 Memory at e0000000 (32-bit, prefetchable) [size=32M] Memory at e2000000 (32-bit, non-prefetchable) [size=4K] and host: 02:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce Go 7600] (rev a1) (prog-if 00 [VGA]) Subsystem: ASUSTeK Computer Inc. Unknown device 1322 Flags: bus master, fast devsel, latency 0, IRQ 11 Memory at de000000 (32-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at dd000000 (64-bit, non-prefetchable) [size=16M] Memory resources do not overlap and other guest device are pio driven. I do not understand this kind of crash. Any idea? Thank you for your time bastien > > Alternatively, please post exact instructions for reproducing. > > > > >> Index: paging_tmpl.h > >> =================================================================== > >> --- paging_tmpl.h (revision 4320) > >> +++ paging_tmpl.h (working copy) > >> @@ -443,31 +443,17 @@ > >> static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) > >> { > > struct guest_walker walker; > > - pt_element_t guest_pte; > > - gpa_t gpa; > > + gpa_t gpa = UNMAPPED_GVA; > > + int r; > > > > - FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); > > - guest_pte = *walker.ptep; > > - FNAME(release_walker)(&walker); > > + r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); > > > > - if (!is_present_pte(guest_pte)) > > - return UNMAPPED_GVA; > > - > > - if (walker.level == PT_DIRECTORY_LEVEL) { > > - ASSERT((guest_pte & PT_PAGE_SIZE_MASK)); > > - ASSERT(PTTYPE == 64 || is_pse(vcpu)); > > - > > - gpa = (guest_pte & PT_DIR_BASE_ADDR_MASK) | (vaddr & > > - (PT_LEVEL_MASK(PT_PAGE_TABLE_LEVEL) | > > ~PAGE_MASK)); > > - > > - if (PTTYPE == 32 && is_cpuid_PSE36()) > > - gpa |= (guest_pte & PT32_DIR_PSE36_MASK) << > > - (32 - PT32_DIR_PSE36_SHIFT); > > - } else { > > - gpa = (guest_pte & PT_BASE_ADDR_MASK); > > - gpa |= (vaddr & ~PAGE_MASK); > > + if (r) { > > + gpa = (gpa_t)walker.gfn << PAGE_SHIFT; > > + gpa |= vaddr & ~PAGE_MASK; > > } > > > > + FNAME(release_walker)(&walker); > > return gpa; > > } > > > -- > error compiling committee.c: too many arguments to function > > ------------------------------------------------------------------------- Take Surveys. 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* Re: KVM 12 and BUG with preempt kernel [not found] ` <195c7a900701240810n2c85c125ubad5ec6baa643fd8-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> @ 2007-01-24 16:53 ` Avi Kivity [not found] ` <195c7a900701240949h781c00aembfdbbf2644250769@mail.gmail.com> 0 siblings, 1 reply; 6+ messages in thread From: Avi Kivity @ 2007-01-24 16:53 UTC (permalink / raw) To: roucaries bastien; +Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f roucaries bastien wrote: >> >> > Nethertheless I think it is time to report >> > another bug (present without this patch therefore unrelated). >> > Unfortunatly I have no trace because it crash my machine and I do not >> > manage to find it. >> > >> > If I booot my debian guest with framebuffer activated after 20s to 15 >> > minutes I see on my host screen a cloud of colorfull pixel. These >> > pixel flash and seems related to guest frame buffer (same colors >> > scheme but because it not the same resolution I can't read it). About >> > 3s latter my box crash and is dead (cap lock does not even toggles the >> > keyboard led). Therefore it seems that the guest achieve to write the >> > host memory :-(, the good point is that he does not poke to my hard >> > drive registers. >> > >> > This behavior is 100% reproductible. If I run the host and I switch to >> > the text console I can't even get a trace because the screen is >> > corrupted. >> >> >> You can start the guest in vnc mode (-vnc 1), so the host can remain in >> text mode, or use netconsole. > The problem is not switching between x and console but read the oops > because kvm write to video mem :-(. And I do not think netconsole > could help because my computer does not answer to irq, I suspect > something nasty. The only think that could help is nmi watchdog but > unfortunatly the bios declare timer interupt as XT-pic and not io-apic > (bios bug forwaded to asus), therefore no nmi. > > Moreover I try vnc switch and kvm is stable, stange isn't. > > To reproduce: > - use an preempt host kernel on amd64, kvm compiled as x86_64 Which host kernel version are you using? > - install a testing debian on a guest using sdl display, use > framebuffer install (default) Please provide a link to the installer so I can try it too. > - wait.... > - when you see colorfull pixel on the top of your sceen, kill kvm > (kill only accelerate the crash) > - wait 1s > - kernel will crash > > I suspect I am seeing this colorfull pixel because I use a vesa driver > on X and the guest write to it. No, the guest cannot write directly to host memory. It writes to a virtualized framebuffer. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ^ permalink raw reply [flat|nested] 6+ messages in thread
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* Re: KVM 12 and BUG with preempt kernel [not found] ` <45B8861B.5050809-atKUWr5tajBWk0Htik3J/w@public.gmane.org> @ 2007-01-26 0:09 ` roucaries bastien [not found] ` <195c7a900701251609t3558f40cp9e89d63dd1c2eb94-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 0 siblings, 1 reply; 6+ messages in thread From: roucaries bastien @ 2007-01-26 0:09 UTC (permalink / raw) To: Avi Kivity; +Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f On 1/25/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote: > roucaries bastien wrote: > > On 1/24/07, roucaries bastien <roucaries.bastien-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > >> On 1/24/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote: > >> > roucaries bastien wrote: > >> > >> > > > >> > >> PS2: -vnc flag seems to be a good workarround, 4 hours without any > >> crash. > >> > > After 4 hours and a half it crach with -vnc only a little bit harder > > to get. > > > > I tried installing debian testing on an amd machine. So far everything > works. > > You'll need to give more details about your machine or about how to > reproduce this if you want progress. Ok using all the debugs option on a new kernel I achieve to get this during the problem. I think it is a non sense but... BUG: soft lockup detected on CPU#1! Call Trace: <IRQ> [<ffffffff802c28a9>] softlockup_tick+0xf9/0x140 [<ffffffff8029d167>] update_process_times+0x57/0x90 [<ffffffff8027dda4>] smp_local_timer_interrupt+0x34/0x60 [<ffffffff8027e56f>] smp_apic_timer_interrupt+0x5f/0x80 [<ffffffff802712f5>] default_idle+0x35/0x60 [<ffffffff802712c0>] default_idle+0x0/0x60 [<ffffffff80265d8b>] apic_timer_interrupt+0x6b/0x70 <EOI> [<ffffffff802712f5>] default_idle+0x35/0x60 [<ffffffff802712f7>] default_idle+0x37/0x60 [<ffffffff802712f5>] default_idle+0x35/0x60 [<ffffffff8024f952>] cpu_idle+0xa2/0xe0 [<ffffffff8027db73>] start_secondary+0x4d3/0x4f0 And I achieve to recover my system killing X. Perhaps an interruption problem. Using full debug the hang disapear strange isn't (smell like a race condition). Regards bastien > -- > error compiling committee.c: too many arguments to function > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ^ permalink raw reply [flat|nested] 6+ messages in thread
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* Re: KVM 12 and BUG with preempt kernel [not found] ` <195c7a900701251609t3558f40cp9e89d63dd1c2eb94-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> @ 2007-01-26 0:14 ` roucaries bastien 0 siblings, 0 replies; 6+ messages in thread From: roucaries bastien @ 2007-01-26 0:14 UTC (permalink / raw) To: Avi Kivity; +Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f On 1/26/07, roucaries bastien <roucaries.bastien-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > On 1/25/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote: > > roucaries bastien wrote: > > > On 1/24/07, roucaries bastien <roucaries.bastien-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > >> On 1/24/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote: > > >> > roucaries bastien wrote: > > >> > >> > > > > > >> > > >> PS2: -vnc flag seems to be a good workarround, 4 hours without any > > >> crash. > > >> > > > After 4 hours and a half it crach with -vnc only a little bit harder > > > to get. > > > > > > > I tried installing debian testing on an amd machine. So far everything > > works. > > > > You'll need to give more details about your machine or about how to > > reproduce this if you want progress. > > Ok using all the debugs option on a new kernel I achieve to get this > during the problem. I think it is a non sense but... > BUG: soft lockup detected on CPU#1! > > Call Trace: > <IRQ> [<ffffffff802c28a9>] softlockup_tick+0xf9/0x140 > [<ffffffff8029d167>] update_process_times+0x57/0x90 > [<ffffffff8027dda4>] smp_local_timer_interrupt+0x34/0x60 > [<ffffffff8027e56f>] smp_apic_timer_interrupt+0x5f/0x80 > [<ffffffff802712f5>] default_idle+0x35/0x60 > [<ffffffff802712c0>] default_idle+0x0/0x60 > [<ffffffff80265d8b>] apic_timer_interrupt+0x6b/0x70 > <EOI> [<ffffffff802712f5>] default_idle+0x35/0x60 > [<ffffffff802712f7>] default_idle+0x37/0x60 > [<ffffffff802712f5>] default_idle+0x35/0x60 > [<ffffffff8024f952>] cpu_idle+0xa2/0xe0 > [<ffffffff8027db73>] start_secondary+0x4d3/0x4f0 > > And I achieve to recover my system killing X. Perhaps an interruption > problem. Using full debug the hang disapear strange isn't (smell like > a race condition). Sorry to answer myself this time with full debug only the geust freeze during harwware access any idea in order to debug? > Regards bastien > > -- > > error compiling committee.c: too many arguments to function > > > > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ^ permalink raw reply [flat|nested] 6+ messages in thread
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2007-01-24 10:47 ` KVM 12 and BUG with preempt kernel roucaries bastien
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2007-01-24 13:24 ` Avi Kivity
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2007-01-24 16:10 ` roucaries bastien
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2007-01-24 16:53 ` Avi Kivity
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2007-01-26 0:09 ` roucaries bastien
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2007-01-26 0:14 ` roucaries bastien
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