panic on kldunload ipfw.ko
Andre Oppermann
andre at freebsd.org
Thu Aug 19 17:39:18 PDT 2004
Nate Lawson wrote:
>
> Easy to reproduce -- boot single user. kldload ipfw.ko; kldunload
> ipfw.ko. Next timeout, you get the following panic:
The bug is fixed in 'netinet/ip_fw_pfil.c' rev 1.5 a few minutes ago.
--
Andre
> panic: write, page not present
> callout_reset() + 0x12c
> tcp_isn_tick() + 0x3f
> softclock
> ithread_loop
>
> (gdb) l *callout_reset+0x12c
> 0xc05011e8 is in callout_reset (../../../kern/kern_timeout.c:437).
> 432
> 433 c->c_arg = arg;
> 434 c->c_flags |= (CALLOUT_ACTIVE | CALLOUT_PENDING);
> 435 c->c_func = ftn;
> 436 c->c_time = ticks + to_ticks;
> 437 TAILQ_INSERT_TAIL(&callwheel[c->c_time & callwheelmask],
> 438 c, c_links.tqe);
> 439 mtx_unlock_spin(&callout_lock);
> 440 }
> 441
>
> (gdb) l *tcp_isn_tick+0x3f
> 0xc0588c4f is in tcp_isn_tick (../../../netinet/tcp_subr.c:1368).
> 1363 if (projected_offset > isn_offset)
> 1364 isn_offset = projected_offset;
> 1365
> 1366 isn_offset_old = isn_offset;
> 1367 callout_reset(&isn_callout, 1, tcp_isn_tick, NULL);
> 1368 }
> 1369
> 1370 /*
> 1371 * When a source quench is received, close congestion window
> 1372 * to one segment. We will gradually open it again as we proceed.
>
> -Nate
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