A few seconds after changing wlan0's mtu to 100 (to debug an application problem), the system froze. Reproducing the problem without Xorg running I got: fk_at_TP51 /usr/crash $ kgdb /boot/kernel/kernel.symbols vmcore.4 GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-marcel-freebsd"... Unread portion of the kernel message buffer: Fatal double fault: eip = 0xc04a63d4 esp = 0xf3c06ff4 ebp = 0xf3c07010 cpuid = 0; apic id = 00 panic: double fault cpuid = 0 KDB: enter: panic panic: from debugger cpuid = 0 Uptime: 4m54s Physical memory: 998 MB Dumping 138 MB: 123 107 91 75 59 43 27 11 Reading symbols from /boot/kernel/unionfs.ko...Reading symbols from /boot/kernel/unionfs.ko.symbols...done. done. Loaded symbols for /boot/kernel/unionfs.ko Reading symbols from /boot/kernel/if_tap.ko...Reading symbols from /boot/kernel/if_tap.ko.symbols...done. done. Loaded symbols for /boot/kernel/if_tap.ko Reading symbols from /boot/kernel/if_iwi.ko...Reading symbols from /boot/kernel/if_iwi.ko.symbols...done. done. Loaded symbols for /boot/kernel/if_iwi.ko Reading symbols from /boot/kernel/snd_ich.ko...Reading symbols from /boot/kernel/snd_ich.ko.symbols...done. done. Loaded symbols for /boot/kernel/snd_ich.ko Reading symbols from /boot/kernel/sound.ko...Reading symbols from /boot/kernel/sound.ko.symbols...done. done. Loaded symbols for /boot/kernel/sound.ko Reading symbols from /boot/kernel/acpi_video.ko...Reading symbols from /boot/kernel/acpi_video.ko.symbols...done. done. Loaded symbols for /boot/kernel/acpi_video.ko Reading symbols from /boot/kernel/radeon.ko...Reading symbols from /boot/kernel/radeon.ko.symbols...done. done. Loaded symbols for /boot/kernel/radeon.ko Reading symbols from /boot/kernel/drm.ko...Reading symbols from /boot/kernel/drm.ko.symbols...done. done. Loaded symbols for /boot/kernel/drm.ko Reading symbols from /boot/kernel/acpi_ibm.ko...Reading symbols from /boot/kernel/acpi_ibm.ko.symbols...done. done. Loaded symbols for /boot/kernel/acpi_ibm.ko Reading symbols from /boot/kernel/geom_eli.ko...Reading symbols from /boot/kernel/geom_eli.ko.symbols...done. done. Loaded symbols for /boot/kernel/geom_eli.ko Reading symbols from /boot/kernel/nullfs.ko...Reading symbols from /boot/kernel/nullfs.ko.symbols...done. done. Loaded symbols for /boot/kernel/nullfs.ko Reading symbols from /boot/kernel/zfs.ko...Reading symbols from /boot/kernel/zfs.ko.symbols...done. done. Loaded symbols for /boot/kernel/zfs.ko Reading symbols from /boot/kernel/opensolaris.ko...Reading symbols from /boot/kernel/opensolaris.ko.symbols...done. done. Loaded symbols for /boot/kernel/opensolaris.ko Reading symbols from /boot/kernel/iwi_bss.ko...Reading symbols from /boot/kernel/iwi_bss.ko.symbols...done. done. Loaded symbols for /boot/kernel/iwi_bss.ko Reading symbols from /boot/kernel/fdescfs.ko...Reading symbols from /boot/kernel/fdescfs.ko.symbols...done. done. Loaded symbols for /boot/kernel/fdescfs.ko #0 doadump () at pcpu.h:246 246 pcpu.h: No such file or directory. in pcpu.h (kgdb) where #0 doadump () at pcpu.h:246 #1 0xc0648486 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:420 #2 0xc06486c2 in panic (fmt=Variable "fmt" is not available. ) at /usr/src/sys/kern/kern_shutdown.c:576 #3 0xc04d5c87 in db_panic (addr=Could not find the frame base for "db_panic". ) at /usr/src/sys/ddb/db_command.c:478 #4 0xc04d6211 in db_command (last_cmdp=0xc09b501c, cmd_table=0x0, dopager=1) at /usr/src/sys/ddb/db_command.c:445 #5 0xc04d636a in db_command_loop () at /usr/src/sys/ddb/db_command.c:498 #6 0xc04d812d in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:229 #7 0xc0672626 in kdb_trap (type=3, code=0, tf=0xc172d170) at /usr/src/sys/kern/subr_kdb.c:534 #8 0xc08be28b in trap (frame=0xc172d170) at /usr/src/sys/i386/i386/trap.c:678 #9 0xc08a399b in calltrap () at /usr/src/sys/i386/i386/exception.s:165 #10 0xc06727aa in kdb_enter (why=0xc092aadd "panic", msg=0xc092aadd "panic") at cpufunc.h:71 #11 0xc06486a6 in panic (fmt=0xc0954134 "double fault") at /usr/src/sys/kern/kern_shutdown.c:559 #12 0xc08bd236 in dblfault_handler () at /usr/src/sys/i386/i386/trap.c:959 #13 0xc04a63d4 in pf_pull_hdr (m=0xc50fd700, off=20, p=0xf3c07080, len=32, actionp=0x0, reasonp=0x0, af=2 '\002') at /usr/src/sys/contrib/pf/net/pf.c:5927 #14 0xc04c166e in pf_normalize_tcp_stateful (m=0xc50fd700, off=20, pd=0xf3c07268, reason=0xf3c07264, th=0xf3c07240, state=0xc69d18e0, src=0xc69d196c, dst=0xc69d1988, writeback=0xf3c0716c) at /usr/src/sys/contrib/pf/net/pf_norm.c:1645 #15 0xc04abd92 in pf_test_state_tcp (state=0xf3c07258, direction=2, kif=0xc667e800, m=0xc50fd700, off=20, h=0xc50fd760, pd=0xf3c07268, reason=0xf3c07264) at /usr/src/sys/contrib/pf/net/pf.c:4952 #16 0xc04b2b0d in pf_test (dir=2, ifp=0xc5d5a400, m0=0xf3c07338, eh=0x0, inp=0xc69bc000) at /usr/src/sys/contrib/pf/net/pf.c:6912 #17 0xc04b9a26 in pf_check_out (arg=0x0, m=0xf3c07338, ifp=0xc5d5a400, dir=2, inp=0xc69bc000) at /usr/src/sys/contrib/pf/net/pf_ioctl.c:3689 #18 0xc06e1418 in pfil_run_hooks (ph=0xc16e2760, mp=0xf3c073a0, ifp=0xc5d5a400, dir=2, inp=0xc69bc000) at /usr/src/sys/net/pfil.c:79 #19 0xc072f951 in ip_output (m=0xc50fd700, opt=0x0, ro=0xf3c073a8, flags=0, imo=0x0, inp=0xc69bc000) at /usr/src/sys/netinet/ip_output.c:470 #20 0xc0790b8d in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1189 #21 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #22 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #23 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #24 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #25 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #26 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #27 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #28 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #29 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #30 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #31 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #32 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #33 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #34 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #35 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 #36 0xc0790c85 in tcp_output (tp=0xc8cda5b8) at /usr/src/sys/netinet/tcp_output.c:1250 #37 0xc0792c8f in tcp_mtudisc (inp=0xc69bc000, errno=0) at tcp_offload.h:269 ---Type <return> to continue, or q <return> to quit---q Quit (kgdb) f 13 #13 0xc04a63d4 in pf_pull_hdr (m=0xc50fd700, off=20, p=0xf3c07080, len=32, actionp=0x0, reasonp=0x0, af=2 '\002') at /usr/src/sys/contrib/pf/net/pf.c:5927 5927 m_copydata(m, off, len, p); (kgdb) l 5922 } 5923 break; 5924 } 5925 #endif /* INET6 */ 5926 } 5927 m_copydata(m, off, len, p); 5928 return (p); 5929 } 5930 5931 int The kernel is FreeBSD 8.0-CURRENT #1: Fri Mar 27 18:07:57 CET 2009. Fabian
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