Seen this before.
Does one of these issues match your case?
https://bugs.freebsd.org/bugzilla/buglist.cgi?quicksearch=Tcp_do_segment&list_id=789107
Regards,
Ronald
Van: Kyle Evans <kev...@freebsd.org>
Datum: 13 januari 2025 02:45
Aan: freebsd-net@freebsd.org
Onderwerp: panic: tcp_do_segment: sent too much
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 ''
(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.
Thanks,
Kyle Evans
