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Type:
Bug
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Resolution: Unresolved
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Priority:
P4
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None
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Affects Version/s: 27
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Component/s: hotspot
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None
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Environment:
+ hostname -I
10.59.82.23 172.17.0.1
+ uname -a
Linux napoleon 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
+ cat /etc/os-release
PRETTY_NAME="Ubuntu 22.04.5 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.5 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy
+ free -h
total used free shared buff/cache available
Mem: 755Gi 24Gi 673Gi 16Mi 57Gi 726Gi
Swap: 0B 0B 0B
+ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 52 bits physical, 57 bits virtual
Byte Order: Little Endian
CPU(s): 224
On-line CPU(s) list: 0-223
Vendor ID: GenuineIntel
Model name: Intel(R) Xeon(R) Platinum 8480+
CPU family: 6
Model: 143
Thread(s) per core: 2
Core(s) per socket: 56
Socket(s): 2
Stepping: 8
Frequency boost: enabled
CPU max MHz: 2001.0000
CPU min MHz: 800.0000
BogoMIPS: 4000.00
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cat_l2 cdp_l3 invpcid_single intel_ppin cdp_l2 ssbd mba ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb intel_pt avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local split_lock_detect avx_vnni avx512_bf16 wbnoinvd dtherm ida arat pln pts avx512vbmi umip pku ospke waitpkg avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg tme avx512_vpopcntdq la57 rdpid bus_lock_detect cldemote movdiri movdir64b enqcmd fsrm md_clear serialize tsxldtrk pconfig arch_lbr amx_bf16 avx512_fp16 amx_tile amx_int8 flush_l1d arch_capabilities ibpb_exit_to_user
Virtualization: VT-x
L1d cache: 5.3 MiB (112 instances)
L1i cache: 3.5 MiB (112 instances)
L2 cache: 224 MiB (112 instances)
L3 cache: 210 MiB (2 instances)
NUMA node(s): 2
NUMA node0 CPU(s): 0-55,112-167
NUMA node1 CPU(s): 56-111,168-223
Vulnerability Gather data sampling: Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Not affected
Vulnerability Mds: Not affected
Vulnerability Meltdown: Not affected
Vulnerability Mmio stale data: Not affected
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Not affected
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; Enhanced / Automatic IBRS; IBPB conditional; PBRSB-eIBRS SW sequence; BHI BHI_DIS_S
Vulnerability Srbds: Not affected
Vulnerability Tsa: Not affected
Vulnerability Tsx async abort: Not affected
Vulnerability Vmscape: Mitigation; IBPB before exit to userspace
+ ldd --version
ldd (Ubuntu GLIBC 2.35-0ubuntu3.11) 2.35
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
+ ulimit -a
real-time non-blocking time (microseconds, -R) unlimited
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 3094007
max locked memory (kbytes, -l) 99023708
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) unlimited
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
+ java -version
openjdk version "27" 2026-09-15
OpenJDK Runtime Environment HJDK-0 (build 27+-4c9103f7)
OpenJDK 64-Bit Server VM HJDK-0 (build 27+-4c9103f7, mixed mode, sharing)
+ java -Xinternalversion
OpenJDK 64-Bit Server VM (27+-4c9103f7) for linux-amd64 JRE (27+-4c9103f7), built on 2026-01-21T14:30:39Z with gcc 10.2.1 20210130 (Red Hat 10.2.1-11)
+ jtreg -version
jtreg 8.1-dev+0
Installed in /home/yansendao/JDK/tools/jtreg/jtreg-8.1.1/lib/jtreg.jar
Running on platform version 27 from /home/yansendao/git/jdk/build/linux-x86_64-server-release/images/jdk.
Built with Java(TM) 2 SDK, Version 17.0.13-testing+0-builds on December 01, 2025.
JT Harness, version 6.0 ea b24 (December 01, 2025)
Java Assembler Tools, version 8.1 ea 01 (December 01, 2025)
TestNG: testng-7.3.0.jar, guice-5.1.0.jar, jcommander-1.82.jar
JUnit: junit-platform-console-standalone-1.13.4.jar
+ git remote -v
origin git@github.com:openjdk/jdk.git (fetch)
origin git@github.com:openjdk/jdk.git (push)
+ git branch- master
+ git log -n 1
+ head -n 1
commit 4c9103f7b6c91b0f237859516ef72bb9ee27157e
+ git status
On branch master
Your branch is up to date with 'origin/master'.
nothing to commit, working tree clean
+ git diff+ hostname -I 10.59.82.23 172.17.0.1 + uname -a Linux napoleon 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux + cat /etc/os-release PRETTY_NAME="Ubuntu 22.04.5 LTS" NAME="Ubuntu" VERSION_ID="22.04" VERSION="22.04.5 LTS (Jammy Jellyfish)" VERSION_CODENAME=jammy ID=ubuntu ID_LIKE=debian HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" UBUNTU_CODENAME=jammy + free -h total used free shared buff/cache available Mem: 755Gi 24Gi 673Gi 16Mi 57Gi 726Gi Swap: 0B 0B 0B + lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 52 bits physical, 57 bits virtual Byte Order: Little Endian CPU(s): 224 On-line CPU(s) list: 0-223 Vendor ID: GenuineIntel Model name: Intel(R) Xeon(R) Platinum 8480+ CPU family: 6 Model: 143 Thread(s) per core: 2 Core(s) per socket: 56 Socket(s): 2 Stepping: 8 Frequency boost: enabled CPU max MHz: 2001.0000 CPU min MHz: 800.0000 BogoMIPS: 4000.00 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cat_l2 cdp_l3 invpcid_single intel_ppin cdp_l2 ssbd mba ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb intel_pt avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local split_lock_detect avx_vnni avx512_bf16 wbnoinvd dtherm ida arat pln pts avx512vbmi umip pku ospke waitpkg avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg tme avx512_vpopcntdq la57 rdpid bus_lock_detect cldemote movdiri movdir64b enqcmd fsrm md_clear serialize tsxldtrk pconfig arch_lbr amx_bf16 avx512_fp16 amx_tile amx_int8 flush_l1d arch_capabilities ibpb_exit_to_user Virtualization: VT-x L1d cache: 5.3 MiB (112 instances) L1i cache: 3.5 MiB (112 instances) L2 cache: 224 MiB (112 instances) L3 cache: 210 MiB (2 instances) NUMA node(s): 2 NUMA node0 CPU(s): 0-55,112-167 NUMA node1 CPU(s): 56-111,168-223 Vulnerability Gather data sampling: Not affected Vulnerability Indirect target selection: Not affected Vulnerability Itlb multihit: Not affected Vulnerability L1tf: Not affected Vulnerability Mds: Not affected Vulnerability Meltdown: Not affected Vulnerability Mmio stale data: Not affected Vulnerability Reg file data sampling: Not affected Vulnerability Retbleed: Not affected Vulnerability Spec rstack overflow: Not affected Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Vulnerability Spectre v2: Mitigation; Enhanced / Automatic IBRS; IBPB conditional; PBRSB-eIBRS SW sequence; BHI BHI_DIS_S Vulnerability Srbds: Not affected Vulnerability Tsa: Not affected Vulnerability Tsx async abort: Not affected Vulnerability Vmscape: Mitigation; IBPB before exit to userspace + ldd --version ldd (Ubuntu GLIBC 2.35-0ubuntu3.11) 2.35 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Written by Roland McGrath and Ulrich Drepper. + ulimit -a real-time non-blocking time (microseconds, -R) unlimited core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 3094007 max locked memory (kbytes, -l) 99023708 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited + java -version openjdk version "27" 2026-09-15 OpenJDK Runtime Environment HJDK-0 (build 27+-4c9103f7) OpenJDK 64-Bit Server VM HJDK-0 (build 27+-4c9103f7, mixed mode, sharing) + java -Xinternalversion OpenJDK 64-Bit Server VM (27+-4c9103f7) for linux-amd64 JRE (27+-4c9103f7), built on 2026-01-21T14:30:39Z with gcc 10.2.1 20210130 (Red Hat 10.2.1-11) + jtreg -version jtreg 8.1-dev+0 Installed in /home/yansendao/JDK/tools/jtreg/jtreg-8.1.1/lib/jtreg.jar Running on platform version 27 from /home/yansendao/git/jdk/build/linux-x86_64-server-release/images/jdk. Built with Java(TM) 2 SDK, Version 17.0.13-testing+0-builds on December 01, 2025. JT Harness, version 6.0 ea b24 (December 01, 2025) Java Assembler Tools, version 8.1 ea 01 (December 01, 2025) TestNG: testng-7.3.0.jar, guice-5.1.0.jar, jcommander-1.82.jar JUnit: junit-platform-console-standalone-1.13.4.jar + git remote -v origin git@github.com:openjdk/jdk.git (fetch) origin git@github.com:openjdk/jdk.git (push) + git branch master + git log -n 1 + head -n 1 commit 4c9103f7b6c91b0f237859516ef72bb9ee27157e + git status On branch master Your branch is up to date with 'origin/master'. nothing to commit, working tree clean + git diff - master
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generic
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linux
stderr: [Exception in thread "main" java.lang.RuntimeException: assertLessThan: expected that 968884224 < 968884224
at jdk.test.lib.Asserts.fail(Asserts.java:715)
at jdk.test.lib.Asserts.assertLessThan(Asserts.java:105)
at jdk.test.lib.Asserts.assertLessThan(Asserts.java:88)
at gc.stress.StressUncommit.main(TestStressG1Uncommit.java:116)
- caused by
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JDK-8238686 G1 may waste lots of space or fail to uncommit when observing MinHeapFreeRatio during sizing after full gc
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- Resolved
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