Re: panic: tcp_setpersist: retransmit pending

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

On Sun, Dec 14, 2008 at 9:44 PM, Rumko <rumcic@gmail.com> wrote:
> With almost latest -HEAD (from about Dec 13 01:30:43 CET) I get the mentioned
> panic. Panic message:
> panic: tcp_setpersist: retransmit pending
> mp_lock = 00000001; cpuid = 1
> Trace beginning at frame 0xdca71cfc
> panic(dca71d20,dd6e96a0,2,dd6e96a0,dca71d24) at panic+0x14d
> panic(c0544cf8,dd6e96a0,dca71d34,c033d52e,dd6e96a0) at panic+0x14d
> tcp_setpersist(dd6e96a0,1,dca71d50,c033d854,dd6e96a0) at tcp_setpersist+0x23
> tcp_timer_persist_handler(dd6e96a0,dd6e987c,1,dd6e987c,0) at
> tcp_timer_persist_handler+0x98
> tcp_timer_handler(dd6e987c) at tcp_timer_handler+0xa4
> netmsg_service(dd6e987c,0,1,ff8083b0,ff808000) at netmsg_service+0x79
> tcpmsg_service_loop(0,0,0,0,0) at tcpmsg_service_loop+0x1d
> lwkt_exit() at lwkt_exit
>
>
> I'm in the process of uploading the cores, but the connection seems a bit slow
> today so it will take quite a while.
>
> I can't reproduce this panic, since it happened while I was sleeping (I know
> rtorrent was running and I was updating applications from pkgsrc, but that
> should have been it).
>
> Also the backtrace:
> (kgdb) bt
> #0  dumpsys () at ./machine/thread.h:83
> #1  0xc02852fd in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:375
> #2  0xc02855c0 in panic (fmt=0xc0544cf8 "tcp_setpersist: retransmit pending")
> at /usr/src/sys/kern/kern_shutdown.c:800
> #3  0xc033787b in tcp_setpersist (tp=0xdd6e96a0)
> at /usr/src/sys/netinet/tcp_output.c:1039
> #4  0xc033d52e in tcp_timer_persist_handler (tp=0xdd6e96a0)
> at /usr/src/sys/netinet/tcp_timer.c:427
> #5  0xc033d854 in tcp_timer_handler (nmsg=0xdd6e987c)
> at /usr/src/sys/netinet/tcp_timer.c:667
> #6  0xc0317043 in netmsg_service (msg=0xdd6e987c, mpsafe_mode=0, mplocked=1)
> at /usr/src/sys/net/netisr.c:307
> #7  0xc033a2cb in tcpmsg_service_loop (dummy=0x0)
> at /usr/src/sys/netinet/tcp_subr.c:400
> #8  0xc028c712 in lwkt_deschedule_self (td=Cannot access memory at address 0x8
> ) at /usr/src/sys/kern/lwkt_thread.c:228

Please test/review following patch:
http://leaf.dragonflybsd.org/~sephe/0001-Restore-the-semantic-of-callout_active-testing-on.patch

Best Regards,
sephe

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