Re: [kvm-devel] [GIT PULL][RESEND] Late KVM Updates for the 2.6.23 merge window
Linus Torvalds wrote: > On Sat, 21 Jul 2007, S.Çağlar Onur wrote: > >> With Linus's latest git, shutting down a guest (fired with -smp 2 -m 512) >> sometimes >> ends up like [1], this occured as soon as qemu window closed. >> >> [1] http://cekirdek.pardus.org.tr/~caglar/kvm/dmesg.latest >> > > [ 737.460654] Bad page state in process 'qemu-kvm' > [ 737.460656] page:f5e68000 flags:0xea02 mapping: mapcount:2 > count:0 > [ 737.460657] Trying to fix it up, but a reboot is needed > [ 737.460659] Backtrace: > [ 737.460691] [] bad_page+0x64/0x8e > [ 737.460733] [] free_hot_cold_page+0x68/0x15a > > That's the "free_pages_check()", and in particular it seems to be > "page_mapcount()" being non-zero that triggered that thing. > > So it looks like something in KVM isn't coherent about the mapping vs the > usage counters.. > > Far more prosaic. It calls __free_page() on the cleanup path with the page's virtual address instead of the struct page. I guess __free_page() is happy with a zeroed out blob, which is the most likely contents. Trivial patch shortly. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [kvm-devel] [GIT PULL][RESEND] Late KVM Updates for the 2.6.23 merge window
Linus Torvalds wrote: On Sat, 21 Jul 2007, S.Çağlar Onur wrote: With Linus's latest git, shutting down a guest (fired with -smp 2 -m 512) sometimes ends up like [1], this occured as soon as qemu window closed. [1] http://cekirdek.pardus.org.tr/~caglar/kvm/dmesg.latest [ 737.460654] Bad page state in process 'qemu-kvm' [ 737.460656] page:f5e68000 flags:0xea02 mapping: mapcount:2 count:0 [ 737.460657] Trying to fix it up, but a reboot is needed [ 737.460659] Backtrace: [ 737.460691] [c0159e70] bad_page+0x64/0x8e [ 737.460733] [c015a7ee] free_hot_cold_page+0x68/0x15a That's the free_pages_check(), and in particular it seems to be page_mapcount() being non-zero that triggered that thing. So it looks like something in KVM isn't coherent about the mapping vs the usage counters.. Far more prosaic. It calls __free_page() on the cleanup path with the page's virtual address instead of the struct page. I guess __free_page() is happy with a zeroed out blob, which is the most likely contents. Trivial patch shortly. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [kvm-devel] [GIT PULL][RESEND] Late KVM Updates for the 2.6.23 merge window
On Sat, 21 Jul 2007, S.Çağlar Onur wrote: > > With Linus's latest git, shutting down a guest (fired with -smp 2 -m 512) > sometimes > ends up like [1], this occured as soon as qemu window closed. > > [1] http://cekirdek.pardus.org.tr/~caglar/kvm/dmesg.latest [ 737.460654] Bad page state in process 'qemu-kvm' [ 737.460656] page:f5e68000 flags:0xea02 mapping: mapcount:2 count:0 [ 737.460657] Trying to fix it up, but a reboot is needed [ 737.460659] Backtrace: [ 737.460691] [] bad_page+0x64/0x8e [ 737.460733] [] free_hot_cold_page+0x68/0x15a That's the "free_pages_check()", and in particular it seems to be "page_mapcount()" being non-zero that triggered that thing. So it looks like something in KVM isn't coherent about the mapping vs the usage counters.. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [kvm-devel] [GIT PULL][RESEND] Late KVM Updates for the 2.6.23 merge window
Hi; 20 Tem 2007 Cum tarihinde, Avi Kivity şunları yazmıştı: > Please pull from the git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm.git for-linus > > to get the following changes: > > Avi Kivity (4): > KVM: MMU: Store nx bit for large page shadows > KVM: Fix memory slot management functions for guest smp > KVM: x86 emulator: implement rdmsr and wrmsr > KVM: MMU: Fix oopses with SLUB > > The last commit is new since the last pull request. With Linus's latest git, shutting down a guest (fired with -smp 2 -m 512) sometimes ends up like [1], this occured as soon as qemu window closed. [1] http://cekirdek.pardus.org.tr/~caglar/kvm/dmesg.latest Cheers -- S.Çağlar Onur <[EMAIL PROTECTED]> http://cekirdek.pardus.org.tr/~caglar/ Linux is like living in a teepee. No Windows, no Gates and an Apache in house! signature.asc Description: This is a digitally signed message part.
Re: [kvm-devel] [GIT PULL][RESEND] Late KVM Updates for the 2.6.23 merge window
Hi; 20 Tem 2007 Cum tarihinde, Avi Kivity şunları yazmıştı: Please pull from the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm.git for-linus to get the following changes: Avi Kivity (4): KVM: MMU: Store nx bit for large page shadows KVM: Fix memory slot management functions for guest smp KVM: x86 emulator: implement rdmsr and wrmsr KVM: MMU: Fix oopses with SLUB The last commit is new since the last pull request. With Linus's latest git, shutting down a guest (fired with -smp 2 -m 512) sometimes ends up like [1], this occured as soon as qemu window closed. [1] http://cekirdek.pardus.org.tr/~caglar/kvm/dmesg.latest Cheers -- S.Çağlar Onur [EMAIL PROTECTED] http://cekirdek.pardus.org.tr/~caglar/ Linux is like living in a teepee. No Windows, no Gates and an Apache in house! signature.asc Description: This is a digitally signed message part.
Re: [kvm-devel] [GIT PULL][RESEND] Late KVM Updates for the 2.6.23 merge window
On Sat, 21 Jul 2007, S.Çağlar Onur wrote: With Linus's latest git, shutting down a guest (fired with -smp 2 -m 512) sometimes ends up like [1], this occured as soon as qemu window closed. [1] http://cekirdek.pardus.org.tr/~caglar/kvm/dmesg.latest [ 737.460654] Bad page state in process 'qemu-kvm' [ 737.460656] page:f5e68000 flags:0xea02 mapping: mapcount:2 count:0 [ 737.460657] Trying to fix it up, but a reboot is needed [ 737.460659] Backtrace: [ 737.460691] [c0159e70] bad_page+0x64/0x8e [ 737.460733] [c015a7ee] free_hot_cold_page+0x68/0x15a That's the free_pages_check(), and in particular it seems to be page_mapcount() being non-zero that triggered that thing. So it looks like something in KVM isn't coherent about the mapping vs the usage counters.. Linus - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
