Date: Wed, 15 Jun 2022 04:55:42 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 264257] [tcp] Panic: Fatal trap 12: page fault while in kernel mode (if_io_tqg_4) - m_copydata ... at /usr/src/sys/kern/uipc_mbuf.c:659 Message-ID: <bug-264257-7501-tFGxAKzPQt@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-264257-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-264257-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D264257 --- Comment #55 from Richard Scheffenegger <rscheff@freebsd.org> --- Thanks for the core. For stable operation, please use an unpatched kernel, = and without net.inet.tcp.rfc6675_pipe=3D0 The patched cores confirm that during the very final phases, the stack increments one of the variables multiple times for the FIN bit, when it sho= uld only have incremented it once. Together with SACK rescue retransmissions (enabled by above sysctl) this leads to an attempt to send out non-existing data. the TCPPCAP and sudo syssctl net.inet.tcp.tcp_pcap_packets=3D10 would retai= n the last 10 packets of every session in-memory, in order to create a reproducti= on script, as the timing (relativ to retransmission timeouts, persist and keepalive timers) of the clients packets apparently has something to do with this problem. --=20 You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug.=
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