Date: Fri, 19 Jun 2020 17:49:07 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 246819] Kernel panic with ifconfig destroy Message-ID: <bug-246819-7501-FlWp6cFm6o@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-246819-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-246819-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246819 Mark Johnston <markj@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Open CC| |markj@FreeBSD.org --- Comment #3 from Mark Johnston <markj@FreeBSD.org> --- (In reply to Ashish Gupta from comment #2) Looks like we are panicking because the counters in the in6_ifstat block are freed. In particular, the panic happens while executing: 790 in6_ifstat_inc(ifp, ifs6_out_request); which expands to 545 #define in6_ifstat_inc(ifp, tag) \=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20 546 do { \=20=20= =20=20=20=20=20=20=20=20=20 547 if (ifp) \=20=20= =20=20=20=20=20=20=20=20=20 548 counter_u64_add(((struct in6_ifextra *) \=20=20= =20=20=20=20=20=20=20=20=20 549 ((ifp)->if_afdata[AF_INET6]))->in6_ifstat[ \=20=20= =20=20=20=20=20=20=20=20=20 550 offsetof(struct in6_ifstat, tag) / sizeof(uint64_t)= ], 1);\=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 551 } while (/*CONSTCOND*/ 0) and the fault address is 0, so it shouldn't be from the if_afdata dereferen= ce or the in6_ifstat dereference (since ifs6_out_request is not the first coun= ter in the block). So the interface is already destroyed, but we are sending TCP keepalives through it. --=20 You are receiving this mail because: You are the assignee for the bug.=
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