x/crypto/ssh/test: TestKeyChange failures

[gopherbot]

#!watchflakes
default <- pkg == "golang.org/x/crypto/ssh/test" && test == "TestKeyChange"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestKeyChange
    session_test.go:96: unable to create new session: EOF
    test_unix_test.go:124: sshd:
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 9: Deprecated option KeyRegenerationInterval
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 10: Deprecated option ServerKeyBits
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 16: Deprecated option RSAAuthentication
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 21: Deprecated option RhostsRSAAuthentication
        debug1: rexec start in -1 out -1 newsock -1 pipe -1 sock 8/9
        rexec line 9: Deprecated option KeyRegenerationInterval
        rexec line 10: Deprecated option ServerKeyBits
...
        debug1: auth_activate_options: setting new authentication options
        Accepted publickey for swarming from UNKNOWN port 65535 ssh2: ECDSA SHA256:DbuSF5a8c3JMmpZ5WiK8oLAx97Uu8zIAFReb/NyTPuo
        debug1: monitor_child_preauth: user swarming authenticated by privileged process
        debug1: auth_activate_options: setting new authentication options [preauth]
        debug2: userauth_pubkey: authenticated 1 pkalg ecdsa-sha2-nistp256 [preauth]
        debug1: monitor_read_log: child log fd closed
        BSM audit: bsm_audit_session_setup: setaudit_addr failed: Invalid argument
        Could not create new audit session
        debug1: do_cleanup
--- FAIL: TestKeyChange (0.26s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/crypto/ssh/test" && test == "TestKeyChange"

2026-09-02 18:02 x_crypto-gotip-darwin-arm64-longtest crypto@86efde54 go@4cff6b26 x/crypto/ssh/test.TestKeyChange (log)

=== RUN   TestKeyChange
    session_test.go:96: unable to create new session: EOF
    test_unix_test.go:124: sshd:
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 9: Deprecated option KeyRegenerationInterval
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 10: Deprecated option ServerKeyBits
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 16: Deprecated option RSAAuthentication
        /Users/swarming/.swarming/w/ir/x/t/sshtest508364749/sshd_config line 21: Deprecated option RhostsRSAAuthentication
        debug1: rexec start in -1 out -1 newsock -1 pipe -1 sock 8/9
        rexec line 9: Deprecated option KeyRegenerationInterval
        rexec line 10: Deprecated option ServerKeyBits
...
        debug1: auth_activate_options: setting new authentication options
        Accepted publickey for swarming from UNKNOWN port 65535 ssh2: ECDSA SHA256:DbuSF5a8c3JMmpZ5WiK8oLAx97Uu8zIAFReb/NyTPuo
        debug1: monitor_child_preauth: user swarming authenticated by privileged process
        debug1: auth_activate_options: setting new authentication options [preauth]
        debug2: userauth_pubkey: authenticated 1 pkalg ecdsa-sha2-nistp256 [preauth]
        debug1: monitor_read_log: child log fd closed
        BSM audit: bsm_audit_session_setup: setaudit_addr failed: Invalid argument
        Could not create new audit session
        debug1: do_cleanup
--- FAIL: TestKeyChange (0.26s)

— watchflakes

[JunyangShao]

Might just be a flake, keep open but wait for into