> On 13. Jan 2025, at 02:44, Kyle Evans <kev...@freebsd.org> wrote: > > Hi, > > I seem to have hit this panic during normal laptop usage with a -CURRENT > running at 2832af7b4ea256b18ef4dbf2ff97a50765f0609a: > > panic: tcp_do_segment: sent too much > cpuid = 5 > time = 1736731772 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe015b74b9b0 > vpanic() at vpanic+0x136/frame 0xfffffe015b74bae0 > panic() at panic+0x43/frame 0xfffffe015b74bb40 > tcp_do_segment() at tcp_do_segment+0x2998/frame 0xfffffe015b74bc20 > tcp_input_with_port() at tcp_input_with_port+0x10f8/frame 0xfffffe015b74bd70 > tcp_input() at tcp_input+0xb/frame 0xfffffe015b74bd80 > ip_input() at ip_input+0x28f/frame 0xfffffe015b74bde0 > swi_net() at swi_net+0x19b/frame 0xfffffe015b74be60 > ithread_loop() at ithread_loop+0x266/frame 0xfffffe015b74bef0 > fork_exit() at fork_exit+0x82/frame 0xfffffe015b74bf30 > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe015b74bf30 > > Doing a little bit of inspection: > > (kgdb) print tp->t_dupacks > $1 = 1 > (kgdb) print tp->snd_limited > $6 = 0 '\000' > (kgdb) p/x tp->t_flags > $4 = 0x10000264 > (kgdb) print maxseg > $1 = 1428 > > `sent` appears to be optimized out. As far as I know, I don't hit this one > often, but I'm wondering if there's anything else useful I could extract here > / if anyone has a theory about what happened. Hi Kyle,
you can run your system with TCP black box logging enabled by using sysctl net.inet.tcp.bb.log_auto_all=1 sysctl net.inet.tcp.bb.log_auto_ratio=1 sysctl net.inet.tcp.bb.log_auto_mode=1 Also have the tcplog_dumper running. You can use tcplog_dumper_enable="YES" in /etc/rc.conf You can install tcplog_dumper by pkg intall tcplog_dumper Using these settings (mode = TCP_LOG_STATE_TAIL), keeps the trailing events of all TCP connections, but does not dump anything to disk. If the kernel panics, we can get the BBLog information from the core. Please note that Gleb has just committed two fixes which also address a panic() like the one you are experiencing. Best regards Michael > > Thanks, > > Kyle Evans >
