x/tools/cmd/signature-fuzzer/fuzz-runner: TestRunner/Minimization2 failures

[gopherbot]

#!watchflakes
default <- pkg == "golang.org/x/tools/cmd/signature-fuzzer/fuzz-runner" && test == "TestRunner/Minimization2"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestRunner/Minimization2
=== PAUSE TestRunner/Minimization2
=== CONT  TestRunner/Minimization2
    rnr_test.go:131: ... begin iteration 0 with current seed 55909
        error executing cmd /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/fzTest: exit status 2
        starting main
        panic: runtime error: invalid memory address or nil pointer dereference
        [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x86d28]
        
        goroutine 19 [running]:
...
        panic: runtime error: invalid memory address or nil pointer dereference
        [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x86d28]
        
        goroutine 19 [running]:
        fmt.(*buffer).writeString(...)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/fmt/print.go:108
        fmt.(*fmt).padString(0x4b8028, {0x0, 0x7})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/fmt/format.go:113 +0x288
        fmt.(*fmt).fmtS(0x4b8028, {0x0, 0x7})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/fmt/format.go:362 +0x4c
...
        main.main.func2(0x496040)
        	/home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/Main.go:30 +0x54
        created by main.main in goroutine 1
        	/home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/Main.go:27 +0x1a0
        ... starting minimization for failed directory /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest
        error executing cmd /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/fzTest: exit status 1
        package minimization succeeded: found bad pkg 1
        error executing cmd /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/fzTest: exit status 1
        function minimization succeeded: found bad fcn 1
--- FAIL: TestRunner/Minimization2 (25.80s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/tools/cmd/signature-fuzzer/fuzz-runner" && test == "TestRunner/Minimization2"

2025-01-09 15:57 x_tools-go1.23-netbsd-arm tools@ae303ab9 release-branch.go1.23@1dde0b48 x/tools/cmd/signature-fuzzer/fuzz-runner.TestRunner/Minimization2 (log)

=== RUN   TestRunner/Minimization2
=== PAUSE TestRunner/Minimization2
=== CONT  TestRunner/Minimization2
    rnr_test.go:131: ... begin iteration 0 with current seed 55909
        error executing cmd /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/fzTest: exit status 2
        starting main
        panic: runtime error: invalid memory address or nil pointer dereference
        [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x86d28]
        
        goroutine 19 [running]:
...
        panic: runtime error: invalid memory address or nil pointer dereference
        [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x86d28]
        
        goroutine 19 [running]:
        fmt.(*buffer).writeString(...)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/fmt/print.go:108
        fmt.(*fmt).padString(0x4b8028, {0x0, 0x7})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/fmt/format.go:113 +0x288
        fmt.(*fmt).fmtS(0x4b8028, {0x0, 0x7})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/fmt/format.go:362 +0x4c
...
        main.main.func2(0x496040)
        	/home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/Main.go:30 +0x54
        created by main.main in goroutine 1
        	/home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/Main.go:27 +0x1a0
        ... starting minimization for failed directory /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest
        error executing cmd /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/fzTest: exit status 1
        package minimization succeeded: found bad pkg 1
        error executing cmd /home/swarming/.swarming/w/ir/x/t/fuzzrun641481422/fuzzTest/fzTest: exit status 1
        function minimization succeeded: found bad fcn 1
--- FAIL: TestRunner/Minimization2 (25.80s)

— watchflakes