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I've upgraded to 0.4.2.6 (as a good software user, but also because I noticed the seccomp changes).

Tor successfully starts with seccomp, but 'soft fails' because it can't write to its data directory (here: /var/lib/tor/data). Tor has permissions to write to this directory - fine with Sandbox 0.

Log:

# cat /var/log/tor/log
Feb 16 00:46:56.000 [notice] Tor 0.4.2.6 opening new log file.
Feb 16 00:46:56.000 [notice] Parsing GEOIP IPv4 file /usr/share/tor/geoip.
Feb 16 00:46:57.000 [notice] Parsing GEOIP IPv6 file /usr/share/tor/geoip6.
Feb 16 00:46:57.000 [notice] Bootstrapped 0% (starting): Starting
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/cached-certs": Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/cached-consensus" for mmap(): Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/unverified-consensus" for mmap(): Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/cached-microdesc-consensus" for mmap(): Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/unverified-microdesc-consensus" for mmap(): Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/cached-microdescs" for mmap(): Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/cached-microdescs.new": Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/cached-descriptors" for mmap(): Operation not permitted
Feb 16 00:46:57.000 [warn] Could not open "/var/lib/tor/data/cached-extrainfo" for mmap(): Operation not permitted
Feb 16 00:46:57.000 [notice] Starting with guard context "default"
Feb 16 00:46:58.000 [warn] Couldn't open "/var/lib/tor/data/state.tmp" (/var/lib/tor/data/state) for writing: Operation not permitted
Feb 16 00:46:58.000 [warn] Unable to write state to file "/var/lib/tor/data/state"; will try again later
Feb 16 00:46:58.000 [notice] Bootstrapped 5% (conn): Connecting to a relay
Feb 16 00:46:58.000 [notice] Bootstrapped 10% (conn_done): Connected to a relay
Feb 16 00:46:58.000 [notice] Bootstrapped 14% (handshake): Handshaking with a relay
Feb 16 00:46:58.000 [notice] Bootstrapped 15% (handshake_done): Handshake with a relay done
Feb 16 00:46:58.000 [notice] Bootstrapped 20% (onehop_create): Establishing an encrypted directory connection
Feb 16 00:46:58.000 [notice] Bootstrapped 25% (requesting_status): Asking for networkstatus consensus
Feb 16 00:46:58.000 [notice] Bootstrapped 30% (loading_status): Loading networkstatus consensus
Feb 16 00:46:59.000 [warn] Couldn't open "/var/lib/tor/data/unverified-microdesc-consensus.tmp" (/var/lib/tor/data/unverified-microdesc-consensus) for writing: Operation not permitted
Feb 16 00:46:59.000 [notice] I learned some more directory information, but not enough to build a circuit: We have no usable consensus.
Feb 16 00:46:59.000 [notice] Bootstrapped 40% (loading_keys): Loading authority key certs
Feb 16 00:46:59.000 [warn] Couldn't open "/var/lib/tor/data/cached-certs.tmp" (/var/lib/tor/data/cached-certs) for writing: Operation not permitted
Feb 16 00:46:59.000 [warn] Error writing certificates to disk.
Feb 16 00:46:59.000 [warn] Could not open "/var/lib/tor/data/unverified-microdesc-consensus" for mmap(): Operation not permitted
Feb 16 00:46:59.000 [notice] I learned some more directory information, but not enough to build a circuit: We have no usable consensus.

Appendix

Environment

Tor: 0.4.2.6
OS: Gentoo arm64
Hardware: Raspberry Pi 4
Kernel: 4.19.102-v8+ (RPi base)

Other info

When running 0.4.2.5, I experienced a crash with seccomp (possibly related to #27315 (moved))?

# tor
Feb 16 00:37:42.963 [notice] Tor 0.4.2.5 running on Linux with Libevent 2.1.8-stable, OpenSSL 1.1.1d, Zlib 1.2.11, Liblzma N/A, and Libzstd N/A.
Feb 16 00:37:42.963 [notice] Tor can't help you if you use it wrong! Learn how to be safe at https://www.torproject.org/download/download#warning
Feb 16 00:37:42.963 [notice] Read configuration file "/etc/tor/torrc".
Feb 16 00:37:42.966 [notice] Opening Socks listener on 127.0.0.1:9050
Feb 16 00:37:42.966 [notice] Opened Socks listener on 127.0.0.1:9050

============================================================ T= 1581813463
(Sandbox) Caught a bad syscall attempt (syscall unlinkat)
tor(+0x1cd714)[0x5571820714]
linux-vdso.so.1(__kernel_rt_sigreturn+0x0)[0x7f8bde0658]
/lib64/libc.so.6(unlink+0x30)[0x7f8b8058d8]
tor(run_tor_main_loop+0x74)[0x55716ae874]
tor(tor_run_main+0x11c)[0x55716aead4]
tor(tor_main+0x50)[0x55716ad458]
tor(main+0x24)[0x55716acf74]
/lib64/libc.so.6(__libc_start_main+0xe4)[0x7f8b758cac]
tor(+0x59fd0)[0x55716acfd0]

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