[Bug 289237] sys/fs/fusefs/last_local_modify:main testcase fails intermittently on arm64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289237

            Bug ID: 289237
           Summary: sys/fs/fusefs/last_local_modify:main testcase fails
                    intermittently on arm64 in CI
           Product: Base System
           Version: CURRENT
          Hardware: arm64
               URL: https://ci.freebsd.org/view/Test/job/FreeBSD-main-aarc
                    h64-test/1756/testReport/sys.fs.fusefs/last_local_modi
                    fy/main/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: asomers@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: testing@FreeBSD.org

Created attachment 263385
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=263385&action=edit
kyua test report

The 'sys/fs/fusefs/last_local_modify:main' testcase fails intermittently on
arm64 with the following message:


Standard output: 
[==========] Running 8 tests from 1 test suite. 
[----------] Global test environment set-up. 
[----------] 8 tests from LLM/LastLocalModify 
[ RUN      ] LLM/LastLocalModify.lookup/0 
[       OK ] LLM/LastLocalModify.lookup/0 (8 ms) 
[ RUN      ] LLM/LastLocalModify.lookup/1 
[       OK ] LLM/LastLocalModify.lookup/1 (5 ms) 
[ RUN      ] LLM/LastLocalModify.lookup/2 
[       OK ] LLM/LastLocalModify.lookup/2 (5 ms) 
[ RUN      ] LLM/LastLocalModify.lookup/3 
/usr/src/tests/sys/fs/fusefs/last_local_modify.cc:337: Failure 
Expected equality of these values: 
  (off_t)newsize 
    Which is: 15 
  sb.st_size 
    Which is: 10 

[  FAILED  ] LLM/LastLocalModify.lookup/3, where GetParam() = "VOP_WRITE" (4
ms) 
[ RUN      ] LLM/LastLocalModify.vfs_vget/0 
[       OK ] LLM/LastLocalModify.vfs_vget/0 (5 ms) 
[ RUN      ] LLM/LastLocalModify.vfs_vget/1 
[       OK ] LLM/LastLocalModify.vfs_vget/1 (5 ms) 
[ RUN      ] LLM/LastLocalModify.vfs_vget/2 
[       OK ] LLM/LastLocalModify.vfs_vget/2 (4 ms) 
[ RUN      ] LLM/LastLocalModify.vfs_vget/3 
[       OK ] LLM/LastLocalModify.vfs_vget/3 (5 ms) 
[----------] 8 tests from LLM/LastLocalModify (45 ms total) 

[----------] Global test environment tear-down 
[==========] 8 tests from 1 test suite ran. (45 ms total) 
[  PASSED  ] 7 tests. 
[  FAILED  ] 1 test, listed below: 
[  FAILED  ] LLM/LastLocalModify.lookup/3, where GetParam() = "VOP_WRITE" 

 1 FAILED TEST 
===> Failed tests 
sys/fs/fusefs/last_local_modify:main  ->  failed: Returned non-success exit
status 1  [0.060s]


This failure is also visible in CI here:
https://ci.freebsd.org/view/Test/job/FreeBSD-main-aarch64-test/1756/testReport/sys.fs.fusefs/last_local_modify/main/

I have reproduced this error using Bricoler with 100 runs for good measure:

$ bricoler run freebsd-src-regression-suite --param freebsd-src:url=/usr/src
--param freebsd-src:branch= --param
freebsd-src-regression-suite:hypervisor=bhyve --param
freebsd-src-regression-suite:memory=4096 --param
freebsd-src-regression-suite:ncpus=2 --param
freebsd-src-regression-suite:parallelism=1 --param
freebsd-src-regression-suite:count=100 --param
freebsd-src-regression-suite:tests='sys/fs/fusefs/last_local_modify:main'

@asomers I see that you have written the tests in
https://cgit.freebsd.org/src/commit/?id=13d593a5b060cf7be40acfa2ca9dc9e0e2339a31
(Fix a race in fusefs that can corrupt a file's size). Please triage as
necessary.

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