Date: Thu, 25 May 2023 16:33:21 -0400 From: Naman Sood <naman@freebsdfoundation.org> To: Mark Johnston <markj@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: APIC interrupting me while stepping through a kernel with kgdb Message-ID: <CACc-QYe8dQLhkVfUDsgkKK2U9wi8ffwt0k-HvT2Ly6OFqLg0rA@mail.gmail.com> In-Reply-To: <ZG_ErodCVMgJsTzN@nuc> References: <CACc-QYeCa-hRd7AO9Tpjg7Mt=mReaHDKazJQrX22r7UAyTbxGQ@mail.gmail.com> <ZG_ErodCVMgJsTzN@nuc>
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Oh. How convenient! I'm running 14.0-CURRENT, though I may have delayed system updates long enough to not have this patch at the moment. Let me get back to you after I run updates and retry - thanks! Naman. On Thu, May 25, 2023 at 4:27=E2=80=AFPM Mark Johnston <markj@freebsd.org> w= rote: > > On Thu, May 25, 2023 at 03:34:56PM -0400, Naman Sood wrote: > > Hello! > > > > I've been following this guide[1] to get kgdb to debug a FreeBSD guest > > on bhyve - I have a WIP patch for pfsync that I want to debug. I'm at > > the point where I can set breakpoints in if_pfsync.c and get them to > > break when I hit them. However, when I step/next from there, control > > always goes to the lapic_handle_timer(), which does its APIC timer > > things, returns control to the line where I set the breakpoint... and > > then immediately goes to the timer again, since presumably a timer > > tick has happened between me pressing Return repeatedly. > > > > Is there a way to get around this? Either turn off the timer (doesn't > > sound like a good idea?) or get kgdb to ignore it so I can debug the > > rest of the kernel? Running skip at the timer code didn't seem to > > help. > > Which revision of FreeBSD are you running? I believe this recent commit > will address the problem you're describing, but you won't have it unless > you're running the main branch: > https://cgit.freebsd.org/src/commit/?id=3Dfefac543590d
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