Hi, I'm running a relatively recent -CURRENT: root_at_nucleus:/usr/obj/usr/src/sys/NUCLEUS # uname -a FreeBSD nucleus 10.0-CURRENT FreeBSD 10.0-CURRENT #50 r244773: Mon Dec 31 16:07:53 EST 2012 root_at_nucleus:/usr/obj/usr/src/sys/NUCLEUS amd64 I ran into this panic twice over the past 24 hours. Both times, Chromium was the program I was actively using, with a few ssh sessions in the background. Below follows kgdb session and hopefully useful information. Any advice on how to further debug this would be appreciated. Glen Script started on Fri Jan 11 14:58:16 2013 root_at_nucleus:/usr/obj/usr/src/sys/NUCLEUS # kgdb kernel.debug /var/crash/vmcore.6 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 "amd64-marcel-freebsd"... Unread portion of the kernel message buffer: panic: Unknown caching mode 8198 cpuid = 3 KDB: stack backtrace: #0 0xffffffff80605a76 at kdb_backtrace+0x66 #1 0xffffffff805cbbbb at panic+0x13b #2 0xffffffff80879748 at pmap_cache_bits+0x58 #3 0xffffffff80880fb4 at pmap_enter+0xa4 #4 0xffffffff8084ed25 at vm_fault_hold+0x1a15 #5 0xffffffff8084f8d3 at vm_fault+0x73 #6 0xffffffff8088593a at trap_pfault+0x13a #7 0xffffffff80886184 at trap+0x4f4 #8 0xffffffff8086f853 at calltrap+0x8 Uptime: 1d14h30m4s Dumping 4646 out of 7951 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91% Reading symbols from /boot/kernel/zfs.ko...Reading symbols from /bootdir/boot/kernel/zfs.ko.symbols...done. done. Loaded symbols for /boot/kernel/zfs.ko Reading symbols from /boot/kernel/opensolaris.ko...Reading symbols from /bootdir/boot/kernel/opensolaris.ko.symbols...done. done. Loaded symbols for /boot/kernel/opensolaris.ko Reading symbols from /boot/kernel/geom_eli.ko...Reading symbols from /bootdir/boot/kernel/geom_eli.ko.symbols...done. done. Loaded symbols for /boot/kernel/geom_eli.ko Reading symbols from /boot/kernel/linux.ko...Reading symbols from /bootdir/boot/kernel/linux.ko.symbols...done. done. Loaded symbols for /boot/kernel/linux.ko Reading symbols from /boot/kernel/coretemp.ko...Reading symbols from /bootdir/boot/kernel/coretemp.ko.symbols...done. done. Loaded symbols for /boot/kernel/coretemp.ko Reading symbols from /boot/kernel/acpi_video.ko...Reading symbols from /bootdir/boot/kernel/acpi_video.ko.symbols...done. done. Loaded symbols for /boot/kernel/acpi_video.ko Reading symbols from /boot/kernel/sem.ko...Reading symbols from /bootdir/boot/kernel/sem.ko.symbols...done. done. Loaded symbols for /boot/kernel/sem.ko Reading symbols from /boot/kernel/acpi_asus.ko...Reading symbols from /bootdir/boot/kernel/acpi_asus.ko.symbols...done. done. Loaded symbols for /boot/kernel/acpi_asus.ko Reading symbols from /boot/kernel/aesni.ko...Reading symbols from /bootdir/boot/kernel/aesni.ko.symbols...done. done. Loaded symbols for /boot/kernel/aesni.ko Reading symbols from /boot/kernel/pf.ko...Reading symbols from /bootdir/boot/kernel/pf.ko.symbols...done. done. Loaded symbols for /boot/kernel/pf.ko Reading symbols from /boot/kernel/i915kms.ko...Reading symbols from /bootdir/boot/kernel/i915kms.ko.symbols...done. done. Loaded symbols for /boot/kernel/i915kms.ko Reading symbols from /boot/kernel/iicbb.ko...Reading symbols from /bootdir/boot/kernel/iicbb.ko.symbols...done. done. Loaded symbols for /boot/kernel/iicbb.ko Reading symbols from /boot/kernel/iicbus.ko...Reading symbols from /bootdir/boot/kernel/iicbus.ko.symbols...done. done. Loaded symbols for /boot/kernel/iicbus.ko Reading symbols from /boot/kernel/iic.ko...Reading symbols from /bootdir/boot/kernel/iic.ko.symbols...done. done. Loaded symbols for /boot/kernel/iic.ko Reading symbols from /boot/kernel/agp.ko...Reading symbols from /bootdir/boot/kernel/agp.ko.symbols...done. done. Loaded symbols for /boot/kernel/agp.ko Reading symbols from /boot/kernel/drm2.ko...Reading symbols from /bootdir/boot/kernel/drm2.ko.symbols...done. done. Loaded symbols for /boot/kernel/drm2.ko Reading symbols from /usr/local/libexec/linux_adobe/linux_adobe.ko...done. Loaded symbols for /usr/local/libexec/linux_adobe/linux_adobe.ko #0 doadump (textdump=<value optimized out>) at pcpu.h:229 229 __asm("movq %%gs:%1,%0" : "=r" (td) (kgdb) bt #0 doadump (textdump=<value optimized out>) at pcpu.h:229 #1 0xffffffff805cb724 in kern_reboot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:446 #2 0xffffffff805cbba5 in panic (fmt=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:753 #3 0xffffffff80879748 in pmap_cache_bits (mode=<value optimized out>, is_pde=<value optimized out>) at /usr/src/sys/amd64/amd64/pmap.c:863 #4 0xffffffff80880fb4 in pmap_enter (pmap=0xfffffe01bfa66440, va=34636066816, access=<value optimized out>, m=0xfffffe023dfc1b70, prot=<value optimized out>, wired=<value optimized out>) at /usr/src/sys/amd64/amd64/pmap.c:3456 #5 0xffffffff8084ed25 in vm_fault_hold (map=0xfffffe01bfa66310, vaddr=34636066816, fault_type=1 '\001', fault_flags=<value optimized out>, m_hold=0x0) at /usr/src/sys/vm/vm_fault.c:914 #6 0xffffffff8084f8d3 in vm_fault (map=0xfffffe01bfa66310, vaddr=34636066816, fault_type=<value optimized out>, fault_flags=0) at /usr/src/sys/vm/vm_fault.c:224 #7 0xffffffff8088593a in trap_pfault (frame=0xffffff8239b37ac0, usermode=1) at /usr/src/sys/amd64/amd64/trap.c:756 #8 0xffffffff80886184 in trap (frame=0xffffff8239b37ac0) at /usr/src/sys/amd64/amd64/trap.c:363 #9 0xffffffff8086f853 in calltrap () at /usr/src/sys/amd64/amd64/exception.S:228 #10 0x000000080b0f2200 in ?? () Previous frame inner to this frame (corrupt stack?) (kgdb) frame 3 #3 0xffffffff80879748 in pmap_cache_bits (mode=<value optimized out>, is_pde=<value optimized out>) at /usr/src/sys/amd64/amd64/pmap.c:863 863 panic("Unknown caching mode %d\n", mode); (kgdb) list *0xffffffff80879748 0xffffffff80879748 is at /usr/src/sys/amd64/amd64/pmap.c:863. 858 pmap_cache_bits(int mode, boolean_t is_pde) 859 { 860 int cache_bits, pat_flag, pat_idx; 861 862 if (mode < 0 || mode >= PAT_INDEX_SIZE || pat_index[mode] < 0) 863 panic("Unknown caching mode %d\n", mode); 864 865 /* The PAT bit is different for PTE's and PDE's. */ 866 pat_flag = is_pde ? PG_PDE_PAT : PG_PTE_PAT; 867 (kgdb) frame 4 #4 0xffffffff80880fb4 in pmap_enter (pmap=0xfffffe01bfa66440, va=34636066816, access=<value optimized out>, m=0xfffffe023dfc1b70, prot=<value optimized out>, wired=<value optimized out>) at /usr/src/sys/amd64/amd64/pmap.c:3456 3456 newpte |= pmap_cache_bits(m->md.pat_mode, 0); (kgdb) p *m $1 = {pageq = {tqe_next = 0x0, tqe_prev = 0xffffffff80d2f1b8}, listq = {tqe_next = 0x0, tqe_prev = 0xfffffe023dfc1b08}, left = 0xfffffe023dfc1af8, right = 0x0, object = 0xfffffe00219a93a0, pindex = 2905, phys_addr = 8809881600, md = {pv_list = {tqh_first = 0x0, tqh_last = 0xfffffe023dfc1bb8}, pat_mode = 8198}, queue = 255 'ÿ', segind = 10 '\n', hold_count = 0, order = 13 '\r', pool = 0 '\0', cow = 0, wire_count = 0, aflags = 0 '\0', oflags = 1 '\001', flags = 0, act_count = 0 '\0', busy = 0 '\0', valid = 255 'ÿ', dirty = 0 '\0'} (kgdb) list *0xffffffff80880fb4 0xffffffff80880fb4 is in pmap_enter (/usr/src/sys/amd64/amd64/pmap.c:3461). 3456 newpte |= pmap_cache_bits(m->md.pat_mode, 0); 3457 3458 mpte = NULL; 3459 3460 lock = NULL; 3461 rw_rlock(&pvh_global_lock); 3462 PMAP_LOCK(pmap); 3463 3464 /* 3465 * In the case that a page table page is not (kgdb) root_at_nucleus:/usr/obj/usr/src/sys/NUCLEUS # ^D Script done on Fri Jan 11 14:58:54 2013
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