[tor-relays] Tor 0.4.7.7 Segmentation fault on Ubuntu 22.04 caused by "rseq"

[Peter Gerber]

There appears to be a merge request for this already:

https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/575

On 5/7/22 05:56, Xiaoqi Chen (Danny) wrote:
> Dear relay operators,
> 
> I recently upgraded one of my relays to Ubuntu 22.04 and now tor keeps
> crashing. I debugged a little bit and saw the following error in the log.
> It appears that it's due to seccomp not allowing "rseq" syscall, and
> possibly related to the latest version of Glibc.
> 
> I temporarily mitigated the issue by turning off sandbox mode (remove
> "Sandbox 1" in torrc). Does anyone know how to properly resolve the
> crashing issue?
> 
> Cheers,
> Danny Chen
> --
> 
> $ sudo tor -f /etc/tor/torrc
> May 07 02:10:46.831 [notice] Tor 0.4.7.7 running on Linux with Libevent
> 2.1.12-stable, OpenSSL 3.0.2, Zlib 1.2.11, Liblzma 5.2.5, Libzstd 1.4.8 and
> Glibc 2.35 as libc.
> ......
> May 07 02:10:46.833 [notice] Opening Directory listener on 0.0.0.0:8080
> May 07 02:10:46.833 [notice] Opened Directory listener connection (ready)
> on 0.0.0.0:8080
> Fatal glibc error: rseq registration failed
> 
> ============================================================ T=Fatal glibc
> error: rseq registration failed
>   1651889448
> Tor 0.4.7.7 died: Caught signal 11
> Fatal glibc error: rseq registration failed
> Fatal glibc error: rseq registration failed
> tor(+0xee525)[0x55c6431d6525]
> /lib/x86_64-linux-gnu/libc.so.6(abort+0x178)[0x7fe6da9ee898]
> /lib/x86_64-linux-gnu/libc.so.6(abort+0x178)[0x7fe6da9ee898]
> /lib/x86_64-linux-gnu/libc.so.6(+0x8945c)[0x7fe6daa4f45c]
> /lib/x86_64-linux-gnu/libc.so.6(+0x89770)[0x7fe6daa4f770]
> /lib/x86_64-linux-gnu/libc.so.6(+0x94b31)[0x7fe6daa5ab31]
> /lib/x86_64-linux-gnu/libc.so.6(+0x126a00)[0x7fe6daaeca00]
> Fatal glibc error: rseq registration failed
> 
> 
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