[tor-bugs] #29819 [Core Tor/Tor]: Linux kernel 5.0.3 crashes sandbox configured Tor client

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#29819: Linux kernel 5.0.3 crashes sandbox configured Tor client
--------------------------------+------------------------------
 Reporter:  toralf              |          Owner:  (none)
     Type:  defect              |         Status:  new
 Priority:  Medium              |      Component:  Core Tor/Tor
  Version:  Tor: 0.4.0.2-alpha  |       Severity:  Normal
 Keywords:                      |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
--------------------------------+------------------------------
 With Sandbox=1 I do get with the new stable Vanilla Linux kernel
 {{{
 ============================================================ T= 1553016509
 (Sandbox) Caught a bad syscall attempt (syscall rt_sigaction)
 /usr/bin/tor(+0x1ce5aa)[0x5636adfa15aa]
 /lib64/libpthread.so.0(+0x14125)[0x7f0d99074125]
 /lib64/libpthread.so.0(+0x14125)[0x7f0d99074125]
 /usr/lib64/libevent-2.1.so.6(evsig_set_handler_+0xeb)[0x7f0d99f4df8b]
 /usr/lib64/libevent-2.1.so.6(+0x2c0b6)[0x7f0d99f4e0b6]
 /usr/lib64/libevent-2.1.so.6(evmap_signal_add_+0xb5)[0x7f0d99f46b55]
 /usr/lib64/libevent-2.1.so.6(event_add_nolock_+0x74e)[0x7f0d99f421ce]
 /usr/lib64/libevent-2.1.so.6(event_add+0x3a)[0x7f0d99f423fa]
 /usr/bin/tor(handle_signals+0xa7)[0x5636ade2a0c7]
 /usr/bin/tor(run_tor_main_loop+0x1a)[0x5636ade2ac8a]
 /usr/bin/tor(tor_run_main+0x1045)[0x5636ade2bea5]
 /usr/bin/tor(tor_main+0x43)[0x5636ade293e3]
 /usr/bin/tor(main+0x19)[0x5636ade28f99]
 /lib64/libc.so.6(__libc_start_main+0xe7)[0x7f0d98cb9ae7]
 /usr/bin/tor(_start+0x2a)[0x5636ade28fea]
 }}}
 An strace narrows it down to
 {{{
 write(2, "(Sandbox) Caught a bad syscall a"..., 48(Sandbox) Caught a bad
 syscall attempt (syscall ) = 48
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29819>
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