kvm: repeatable kernel crash with Athlon II cpu
Hello.
I've been running dosemu and found out that it hangs or reboots one of my PCs. This happens with any fedora-23 kernels and hand-compiled kernels. The latest I tried, were:
4.4.6-300.fc23.x86_64
4.5.0-rc6
I tried to put the debug printfs into dosemu, and it seems the crash happens on KVM_RUN ioctl, but of course the one can't say for sure when an instant reboot happens. Yet if I disable the KVM use, or try on a different CPU, there is no crash too, so I am pretty sure it is the KVM bug.
The CPU on which the problem happens:
AMD Athlon(tm) II X2 245 Processor
The CPUs on which the problem doesn't happen:
AMD FX 8350
Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz
I've set up the test-case here:
https://github.com/stsp/dosemu2/tree/bug
After checking out this branch, you need to get the file c_drive/c.tar.gz
and unpack it into ~/.dosemu/drives so that ~/.dosemu/drives/c exists.
After that you need to build and run dosemu.
Make sure to install slang-devel first, so that it can work on a text-console (kms or non-kms).
Then run dosemu. Dos Navigator should load. Hit Alt-x to exit, then Enter to confirm. At this point the host machine reboots, or, if there is a different CPU - dosemu just exits. The test must be repeated 2-3 times to make sure, but in most cases it works from the first time.
Hope someone can find such an old CPU an reproduce the problem. Please let me know what info should I provide or what debugging to do to help getting that fixed.
Paolo Bonzini
maintainerQuoted 5 lines · Stas Sergeev
I've been running dosemu and found out that it hangs or reboots one of my PCs. This happens with any fedora-23 kernels and hand-compiled kernels. The latest I tried, were:
4.4.6-300.fc23.x86_64
4.5.0-rc6
Can you check if 4.3 works?
Quoted 5 lines
I tried to put the debug printfs into dosemu, and it seems the crash happens on
KVM_RUNioctl, but of course the one can't say for sure when an instant reboot happens. Yet if I disable the KVM use, or try on a different CPU, there is no crash too, so I am pretty sure it is the KVM bug.
Yes, that's likely.
Quoted 3 lines
Hope someone can find such an old CPU an reproduce the problem. Please let me know what info should I provide or what debugging to do to help getting that fixed.
Do you have experience bisecting the kernel? If so perhaps you can try doing that.
Paolo
29.03.2016 18:37, Paolo Bonzini пишет:
Quoted 10 lines · Stas Sergeev
Quoted 5 lines
I've been running dosemu and found out that it hangs or reboots one of my PCs. This happens with any fedora-23 kernels and hand-compiled kernels. The latest I tried, were:
4.4.6-300.fc23.x86_64
4.5.0-rc6Can you check if 4.3 works?
Same crash on kernel-4.2.3-300.fc23.x86_64 - the oldest available for f23.
Quoted 6 lines
Quoted 3 lines
Hope someone can find such an old CPU an reproduce the problem. Please let me know what info should I provide or what debugging to do to help getting that fixed.
Do you have experience bisecting the kernel? If so perhaps you can try doing that.
But it looks like a genuine bug, not a regression. Of course I can check some 3.x versions...
Paolo Bonzini
maintainerQuoted 11 lines · Stas Sergeev
Quoted 7 lines
Quoted 5 lines
I've been running dosemu and found out that it hangs or reboots one of my PCs. This happens with any fedora-23 kernels and hand-compiled kernels. The latest I tried, were:
4.4.6-300.fc23.x86_64
4.5.0-rc6Can you check if 4.3 works?
Same crash on kernel-4.2.3-300.fc23.x86_64 - the oldest available for f23.
Quoted 7 lines
Quoted 6 lines
Quoted 6 lines
Quoted 3 lines
Quoted 3 lines
Hope someone can find such an old CPU an reproduce the problem. Please let me know what info should I provide or what debugging to do to help getting that fixed.
Do you have experience bisecting the kernel? If so perhaps you can try doing that.
But it looks like a genuine bug, not a regression.
Yeah, I was hoping it was introduced recently.
Quoted 1 line
Of course I can check some 3.x versions...
That would help a lot, thanks.
Paolo
29.03.2016 19:27, Paolo Bonzini пишет:
Quoted 18 lines · Stas Sergeev
Quoted 17 lines
Quoted 7 lines
Quoted 5 lines
I've been running dosemu and found out that it hangs or reboots one of my PCs. This happens with any fedora-23 kernels and hand-compiled kernels. The latest I tried, were:
4.4.6-300.fc23.x86_64
4.5.0-rc6Can you check if 4.3 works?
Same crash on kernel-4.2.3-300.fc23.x86_64 - the oldest available for f23.
Quoted 6 lines
Quoted 6 lines
Quoted 3 lines
Quoted 3 lines
Hope someone can find such an old CPU an reproduce the problem. Please let me know what info should I provide or what debugging to do to help getting that fixed.
Do you have experience bisecting the kernel? If so perhaps you can try doing that.
Quoted 7 lines
Quoted 1 line
But it looks like a genuine bug, not a regression.
Yeah, I was hoping it was introduced recently.
Quoted 1 line
Of course I can check some 3.x versions...
That would help a lot, thanks.
Same on 3.18, and that's the oldest kernel that can be built on f23 (gcc5).
So that's a genuine bug after all, not a regression.
So does anyone have the AMD AthlonII X2 245 to try reproducing this?
Paolo Bonzini
maintainerQuoted 2 lines · Stas Sergeev
Same on 3.18, and that's the oldest kernel that can be built on f23 (gcc5).
Can you try getting even older kernel directly from Koji? Worst case it doesn't boot. :)
Paolo
Quoted 2 lines
So that's a genuine bug after all, not a regression.
So does anyone have the AMD AthlonII X2 245 to try reproducing this?
29.03.2016 20:13, Paolo Bonzini пишет:
Quoted 8 lines · Stas Sergeev
Quoted 2 lines
Same on 3.18, and that's the oldest kernel that can be built on f23 (gcc5).
Can you try getting even older kernel directly from Koji? Worst case it doesn't boot. :)
Could you please send me the URLs?
This koji server is too slow to successfully browse it.
Paolo Bonzini
maintainerQuoted 12 lines · Stas Sergeev
29.03.2016 20:13, Paolo Bonzini пишет:
Quoted 8 lines · Stas Sergeev
Quoted 2 lines
Same on 3.18, and that's the oldest kernel that can be built on f23 (gcc5).
Can you try getting even older kernel directly from Koji? Worst case it doesn't boot. :)
Could you please send me the URLs?
This koji server is too slow to successfully browse it.
Here they are:
kernel-2.6.35.6-45.fc14
http://koji.fedoraproject.org/koji/buildinfo?buildID=201002
kernel-2.6.38.6-26.rc1.fc15
http://koji.fedoraproject.org/koji/buildinfo?buildID=243161
kernel-3.1.0-7.fc16
http://koji.fedoraproject.org/koji/buildinfo?buildID=271832
kernel-3.3.4-5.fc17
http://koji.fedoraproject.org/koji/buildinfo?buildID=317848
kernel-3.6.10-4.fc18
http://koji.fedoraproject.org/koji/buildinfo?buildID=372260
kernel-3.9.5-301.fc19
http://koji.fedoraproject.org/koji/buildinfo?buildID=426020
kernel-3.11.10-301.fc20
http://koji.fedoraproject.org/koji/buildinfo?buildID=483008
kernel-3.17.4-301.fc21
http://koji.fedoraproject.org/koji/buildinfo?buildID=596012
Paolo
29.03.2016 20:13, Paolo Bonzini пишет:
Quoted 6 lines · Stas Sergeev
Quoted 2 lines
Same on 3.18, and that's the oldest kernel that can be built on f23 (gcc5).
Can you try getting even older kernel directly from Koji? Worst case it doesn't boot. :)
kernel-3.9.5-301.fc19.x86_64: crash happens
any older: no boot.