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authorChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:34:26 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:35:44 +0000
commit25f8033d556aa17afaea4a5196ea7a69fe248320 (patch)
tree0f056db167683be54ea1e5e72d29d6069af55e7d /results/classifier/deepseek-2-tmp/output/KVM/1687653
parent8e6da29e4ee5fc14bc1cc816a24f21271f14090d (diff)
downloademulator-bug-study-25f8033d556aa17afaea4a5196ea7a69fe248320.tar.gz
emulator-bug-study-25f8033d556aa17afaea4a5196ea7a69fe248320.zip
add new temporary deepseek-r1:14b results
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diff --git a/results/classifier/deepseek-2-tmp/output/KVM/1687653 b/results/classifier/deepseek-2-tmp/output/KVM/1687653
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+
+QEMU-KVM / detect_zeroes causes KVM to start unlimited number of threads on Guest-Sided High-IO with big Blocksize
+
+QEMU-KVM in combination with "detect_zeroes=on" makes a Guest able to DoS the Host. This is possible if the Host itself has "detect_zeroes" enabled and the Guest writes a large Chunk of data with a huge blocksize onto the drive.
+
+E.g.: dd if=/dev/zero of=/tmp/DoS bs=1G count=1 oflag=direct
+
+All QEMU-Versions after implementation of detect_zeroes are affected. Prior are unaffected. This is absolutely critical, please fix this ASAP!
+
+#####
+
+Provided by Dominik Csapak:
+
+source , bs , count , O_DIRECT, behaviour
+
+urandom , bs 1M, count 1024, O_DIRECT: OK
+file , bs 1M, count 1024, O_DIRECT: OK
+/dev/zero , bs 1M, count 1024, O_DIRECT: OK
+zero file , bs 1M, count 1024, O_DIRECT: OK
+/dev/zero , bs 1G, count 1, O_DIRECT: NOT OK
+zero file , bs 1G, count 1, O_DIRECT: NOT OK
+zero file , bs 1G, count 1, no O_DIRECT: NOT OK
+rand file , bs 1G, count 1, O_DIRECT: OK
+rand file , bs 1G, count 1, no O_DIRECT: OK
+
+discard on:
+
+urandom , bs 1M, count 1024, O_DIRECT: OK
+rand file , bs 1M, count 1024, O_DIRECT: OK
+/dev/zero , bs 1M, count 1024, O_DIRECT: OK
+zero file , bs 1M, count 1024, O_DIRECT: OK
+/dev/zero , bs 1G, count 1, O_DIRECT: NOT OK
+zero file , bs 1G, count 1, O_DIRECT: NOT OK
+zero file , bs 1G, count 1, no O_DIRECT: NOT OK
+rand file , bs 1G, count 1, O_DIRECT: OK
+rand file , bs 1G, count 1, no O_DIRECT: OK
+
+detect_zeros off:
+
+urandom , bs 1M, count 1024, O_DIRECT: OK
+rand file , bs 1M, count 1024, O_DIRECT: OK
+/dev/zero , bs 1M, count 1024, O_DIRECT: OK
+zero file , bs 1M, count 1024, O_DIRECT: OK
+/dev/zero , bs 1G, count 1, O_DIRECT: OK
+zero file , bs 1G, count 1, O_DIRECT: OK
+zero file , bs 1G, count 1, no O_DIRECT: OK
+rand file , bs 1G, count 1, O_DIRECT: OK
+rand file , bs 1G, count 1, no O_DIRECT: OK
+
+#####
+
+Provided by Florian Strankowski
+
+bs - count - io-threads
+
+512K - 2048 - 2
+1M - 1024 - 2
+2M - 512 - 4
+4M - 256 - 6
+8M - 128 - 10
+16M - 64 - 18
+32M - 32 - uncountable
+
+Please refer to further information here:
+
+https://bugzilla.proxmox.com/show_bug.cgi?id=1368 \ No newline at end of file