How to disable the builtin SIGSEGV handler in ROOT

[karuboniru]

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ROOT Version: 6.26/00
Platform: linuxx8664gcc
Compiler: g++ (GCC) 12.0.1 20220308 (Red Hat 12.0.1-0)

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I am writing some small program that is using and linked to ROOT, I noticed a mechanism that when program (linked to ROOT) gets a SIGSEGV, it will spawn a GDB and print backtrace, instead of just crashing and letting kernel/systemd-coredumpd to kick in to grab a coredump file. (Nevertheless to say the backtrace printing is broken on my Fedora 36 machine, but this specific problem should be reported to Fedora maintainers I think.)

While the built in SIGSEGV handler can be distrubing when I want to get a coredump from systemd-coredumpd for further debugging, is there anyway to disable/bypass it?

[Wile_E_Coyote]

Maybe:
Fedora Project Wiki → Automatic Bug Reporting Tool
Fedora Project Wiki → StackTraces
Fedora Project Wiki → Features → CrashHandling
Fedora Project Wiki → Features → Apport

[karuboniru]

Yes, this will help for me to report about the problem that the builtin straceback generator from ROOT shipped with Fedora. While I wanted to disable the mechanism of the builtin straceback completely, could it be possible?

[eguiraud]

Hi @karuboniru,
if there is a way to disable it (without patching ROOT, that is), @pcanal will know, let’s ping him.

On the other hand, if it can help, please note that you can attach a debugger to the process and it will work as usual.

Cheers,
Enrico

[pcanal]

It is:

gSystem->ResetSignal(kSigBus);
gSystem->ResetSignal(kSigSegmentationViolation);
gSystem->ResetSignal(kSigIllegalInstruction);