Date: Mon, 9 Jan 2006 17:03:52 +0000 From: "Wojciech A. Koszek" <dunstan@freebsd.czest.pl> To: freebsd-current@freebsd.org Subject: [PANIC] More details about problem with syscons(4) Message-ID: <20060109170351.GA2024@FreeBSD.czest.pl>
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Hello, There is a problem I've reported earlier: http://lists.freebsd.org/pipermail/freebsd-current/2005-November/058221.html Analisis has shown that allscreen_flags="80x50" or allscreen_flags="MODE_278" is a reason. After I removed it and run my box with typical 80x25 console, everything seems to be fine. I'm getting that problem from time to time, which is really unpleasant (especially because it happens after fsck'ing your filesystem when it's mounted read/write). For some time I've been running modified schistory.c from src/sys/dev/syscons. It's here: http://freebsd.czest.pl/dunstan/FreeBSD/vidcontrol/schistory.c Successful booting with my printf's looks like that: http://freebsd.czest.pl/dunstan/FreeBSD/vidcontrol/dmesg_success.txt I got a panic, obtained a crash dump and was able to track it. Result is here: http://freebsd.czest.pl/dunstan/FreeBSD/vidcontrol/syscons_crash.txt As you see from attached information, I'm running with: options SC_PIXEL_MODE options SC_HISTORY_SIZE=20000 Complete kernel configuration is here: http://freebsd.czest.pl/dunstan/FreeBSD/vidcontrol/LAPTOP http://freebsd.czest.pl/dunstan/FreeBSD/vidcontrol/devel http://freebsd.czest.pl/dunstan/FreeBSD/vidcontrol/debug http://freebsd.czest.pl/dunstan/FreeBSD/vidcontrol/security rwatson@ suggested that this highly XXXed part in schistory might be a problem, since this area is where memory allocation happens. I belive my analisis can confirm it: (kgdb) list *0xc05db628 0xc05db628 is in sc_alloc_history_buffer (/usr/src/sys/dev/syscons/schistory.c:154). 149 150 /* FIXME: XXX no good? */ 151 152 sc_vtb_clear(history, scp->sc->scr_map[0x20], 153 SC_NORM_ATTR << 8); 154 SC_DBG("prev_history=%p", prev_history); 155 if (prev_history != NULL) 156 copy_history(prev_history, history); 157 scp->history_pos = sc_vtb_tail(history); 158 SC_DBG("scp->history_pos=%d", scp->history_pos); -- * Wojciech A. Koszek && dunstan@FreeBSD.czest.pl
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