Date: Mon, 4 Sep 2023 10:32:41 -0500 From: Kyle Evans <kevans@FreeBSD.org> To: Souradeep Chakrabarti <schakrabarti@microsoft.com>, "freebsd-hackers@FreeBSD.org" <freebsd-hackers@freebsd.org>, "freebsd-arm@FreeBSD.org" <freebsd-arm@FreeBSD.org> Cc: Wei Hu <weh@microsoft.com> Subject: Re: FreeBSD arm64 Azure panic during reboot in add_route Message-ID: <d17f777a-e97a-a22d-a80a-1fc07b9491e6@FreeBSD.org> In-Reply-To: <PUZP153MB07888CFDD2AB9105920A1C29CCE9A@PUZP153MB0788.APCP153.PROD.OUTLOOK.COM> References: <PUZP153MB07888CFDD2AB9105920A1C29CCE9A@PUZP153MB0788.APCP153.PROD.OUTLOOK.COM>
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On 9/4/23 05:13, Souradeep Chakrabarti wrote: > Hi > I am working on bringing FreeBSD on Azure ARM64. When I am rebooting the FreeBSD arm64 in Azure public preview, > we are hitting following panic sometime for page fault: > db_trace_self_wrapper() at db_trace_self_wrapper+0x30 > vpanic() at vpanic+0x13c > panic() at panic+0x44 > data_abort() at data_abort+0x30c > handle_el1h_sync() at handle_el1h_sync+0x14 > --- exception, esr 0x8600000e > (null)() at 0xffffa0000c93bb00 > add_route() at add_route+0xc4 > add_route_flags() at add_route_flags+0x1b0 > rib_add_route() at rib_add_route+0x324 > ifa_maintain_loopback_route() at ifa_maintain_loopback_route+0xf4 > in6_update_ifa() at in6_update_ifa+0x994 > in6_ifattach() at in6_ifattach+0x1bc > in6_if_up() at in6_if_up+0x90 > if_up() at if_up+0xd8 > ifhwioctl() at ifhwioctl+0xb7c > ifioctl() at ifioctl+0x860 > kern_ioctl() at kern_ioctl+0x2dc > sys_ioctl() at sys_ioctl+0x118 > do_el0_sync() at do_el0_sync+0x520 > handle_el0_sync() at handle_el0_sync+0x44 > > The panic is coming when add_route is called for loopback interface ipv6 attachment. > Upon more investigating it looks like the panic happens in rib_notify() . > > Please let me know how to debug it further to find the RC. > I have already opened a bug to track it : https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272666 > Hi, I note that Andy has an unanswered question in that PR (comment #9) from 2023/08/14. Do you have a coredump from this that you can poke around in easily with kgdb? Thanks, Kyle Evans
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