Closed Bug 1310286 Opened 3 years ago Closed 3 years ago
Ignore the SIG64 signal that the Linux sandboxing code triggers on older kernels
Bug 1310286 - Instruct gdb to ignore certain signals for which it is not useful to stop. DONTBUILD NPOTB
58 bytes, text/x-review-board-request
On Linux kernel versions that don't support seccomp tsync (such as the 3.16 that ships with current Debian stable), the sandboxing code  produces SIG64 signals in rapid succession near the child process's startup, which makes debugging with rr (and with regular gdb, if you're attached to the child process from the start of its lifetime) annoying. See  for the initial investigation where we discovered this. I'd like to propose amending our .gdbinit file to ignore this signal.  http://searchfox.org/mozilla-central/rev/d96317a351af8aa78ab9847e7feed964bbaac7d7/security/sandbox/linux/Sandbox.cpp#360  https://github.com/mozilla/rr/issues/1832
Comment on attachment 8801211 [details] Bug 1310286 - Instruct gdb to ignore certain signals for which it is not useful to stop. DONTBUILD NPOTB https://reviewboard.mozilla.org/r/85938/#review85314 ::: .gdbinit:14 (Diff revision 1) > # Don't stop for the SIG32/33/etc signals that Flash produces > handle SIG32 noprint nostop pass > handle SIG33 noprint nostop pass > handle SIGPIPE noprint nostop pass > > +# Don't stop for the SIG64 signals triggered by the Linux trailing whitespace ::: .gdbinit:16 (Diff revision 1) > handle SIG33 noprint nostop pass > handle SIGPIPE noprint nostop pass > > +# Don't stop for the SIG64 signals triggered by the Linux > +# sandboxing code on older kernels. > +handle SIG64 noprint nostop pass While you're here, you might as well add SIG38. Not sure what's producing them, but they're happening all the time for me and a lot of people.
Attachment #8801211 - Flags: review?(mh+mozilla) → review+
Updated to address review comment.
Pushed by email@example.com: https://hg.mozilla.org/integration/autoland/rev/976afe660227 Instruct gdb to ignore certain signals for which it is not useful to stop. r=glandium DONTBUILD NPOTB
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