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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:24:58 +0000 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:27:06 +0000 |
| commit | 33606b41d35115f887ea688b1a16f2ff85bf2fe4 (patch) | |
| tree | 406b2c7b19a087ba437c68f3dbf0b589fa1d6150 /results/scraper/launchpad-without-comments/1813940 | |
| parent | adedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff) | |
| download | emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip | |
add launchpad bug reports without comments
Diffstat (limited to 'results/scraper/launchpad-without-comments/1813940')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1813940 | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1813940 b/results/scraper/launchpad-without-comments/1813940 new file mode 100644 index 00000000..78cccf23 --- /dev/null +++ b/results/scraper/launchpad-without-comments/1813940 @@ -0,0 +1,46 @@ +kvm_mem_ioeventfd_add: error adding ioeventfd: No space left on device + +Latest QEMU master fails to run with too many MMIO devices specified. + +After patch 3ac7d43a6fb [1] QEMU just prints an error message and exits. +> kvm_mem_ioeventfd_add: error adding ioeventfd: No space left on device + +This is reproducible e.g. with the following setup: + +qemu-3.1.50-dirty \ + -machine pc-i440fx-2.7,accel=kvm \ + -cpu host -m 4096 \ + -smp 2,sockets=2,cores=1,threads=1 \ + -drive file=freebsd_vm_1.qcow2,format=qcow2,if=none,id=bootdr \ + -device ide-hd,drive=bootdr,bootindex=0 \ + -device virtio-scsi-pci,id=vc0 \ + -device virtio-scsi-pci,id=vc1 \ + -device virtio-scsi-pci,id=vc2 \ + -device virtio-scsi-pci,id=vc3 \ + +Running with just 3 Virtio-SCSI controllers seems to work fine, adding more than that causes the error above. Note that this is not Virtio-SCSI specific. I've also reproduced this without any Virtio devices whatsoever. + +strace shows the following ioctl chain over and over: + +145787 ioctl(11, KVM_UNREGISTER_COALESCED_MMIO, 0x7f60a4985410) = 0 +145787 ioctl(11, KVM_UNREGISTER_COALESCED_MMIO, 0x7f60a4985410) = 0 +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = 0 +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) +145787 ioctl(11, KVM_REGISTER_COALESCED_MMIO, 0x7f60a49853b0) = -1 ENOSPC (No space left on device) + +Which suggests there's some kind of MMIO region leak. + +[1] +commit 3ac7d43a6fbb5d4a3d01fc9a055c218030af3727 +Author: Paolo Bonzini <email address hidden> +AuthorDate: Wed Nov 28 17:28:45 2018 +0100 +Commit: Paolo Bonzini <email address hidden> +CommitDate: Fri Jan 11 13:57:24 2019 +0100 + + memory: update coalesced_range on transaction_commit \ No newline at end of file |