fatal trap 12

[georg at dts.su]

Hello, Freebsd-questions.

After one of new crash I have this:

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Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x0
fault code              = supervisor read data, page not present
instruction pointer     = 0x8:0xffffffff804c4eb8
stack pointer           = 0x10:0xffffff807a0478f0
frame pointer           = 0x10:0xffffff807a047930
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 32668 (perl5.10.0)
Physical memory: 4082 MB
Dumping 1647 MB: 1632 1616 1600 1584 1568 1552 1536 1520 1504 1488 1472 1456 1440 1424 1408 1392 1376 1360 1344 1328 1312 1296 1280 1264 1248 1232 1216 1200 1184 1168 1152 1136 1120 1104 1088 1072 1056 1040 1024 1008 992 976 960 944 928 912 896 880 864 848 832 816 800 784 768 752 736 720 704 688 672 656 640 624 608 592 576 560 544 528 512 496 480 464 448 432 416 400 384 368 352 336 320 304 288 272 256 240 224 208 192 176 160 144 128 112 96 80 64 48 32 16

Reading symbols from /boot/kernel/accf_http.ko...Reading symbols from /boot/kernel/accf_http.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/accf_http.ko
#0  doadump () at pcpu.h:195
195             __asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb) list *0xffffffff804c4eb8
0xffffffff804c4eb8 is in pfs_ioctl (/usr/src/sys/fs/pseudofs/pseudofs_vnops.c:265).
260     static int
261     pfs_ioctl(struct vop_ioctl_args *va)
262     {
263             struct vnode *vn = va->a_vp;
264             struct pfs_vdata *pvd = vn->v_data;
265             struct pfs_node *pn = pvd->pvd_pn;
266             struct proc *proc;
267             int error;
268
269             PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command));
(kgdb) backtrace
#0  doadump () at pcpu.h:195
#1  0xffffffff801c8dac in db_fncall (dummy1=Variable "dummy1" is not available.
) at /usr/src/sys/ddb/db_command.c:516
#2  0xffffffff801c92df in db_command (last_cmdp=0xffffffff80b30c88, cmd_table=0x0, dopager=1) at /usr/src/sys/ddb/db_command.c:413
#3  0xffffffff801c94f0 in db_command_loop () at /usr/src/sys/ddb/db_command.c:466
#4  0xffffffff801cb0d9 in db_trap (type=Variable "type" is not available.
) at /usr/src/sys/ddb/db_main.c:228
#5  0xffffffff80554e55 in kdb_trap (type=12, code=0, tf=0xffffff807a047840) at /usr/src/sys/kern/subr_kdb.c:524
#6  0xffffffff807fae80 in trap_fatal (frame=0xffffff807a047840, eva=Variable "eva" is not available.
) at /usr/src/sys/amd64/amd64/trap.c:752
#7  0xffffffff807fb254 in trap_pfault (frame=0xffffff807a047840, usermode=0) at /usr/src/sys/amd64/amd64/trap.c:673
#8  0xffffffff807fbc02 in trap (frame=0xffffff807a047840) at /usr/src/sys/amd64/amd64/trap.c:444
#9  0xffffffff807df35e in calltrap () at /usr/src/sys/amd64/amd64/exception.S:209
#10 0xffffffff804c4eb8 in pfs_ioctl (va=0xffffff807a047a10) at /usr/src/sys/fs/pseudofs/pseudofs_vnops.c:264
#11 0xffffffff805bb1d3 in vn_ioctl (fp=Variable "fp" is not available.
) at vnode_if.h:437
#12 0xffffffff80562d02 in kern_ioctl (td=0xffffff0006682000, fd=3, com=1076655123, data=0xffffff00ad2b7d40 "") at file.h:269
#13 0xffffffff80563029 in ioctl (td=0xffffff0006682000, uap=0xffffff807a047bf0) at /usr/src/sys/kern/sys_generic.c:571
#14 0xffffffff807fb4d6 in syscall (frame=0xffffff807a047c80) at /usr/src/sys/amd64/amd64/trap.c:900
#15 0xffffffff807df56b in Xfast_syscall () at /usr/src/sys/amd64/amd64/exception.S:330
#16 0x0000000800c9c0ec in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)


Can You help me? What can I do? Server crash periodicaly...

>  For this question, you must debug the kernel by Serial. 
> when fatal, you use find the error by command "bt".

> ------------------                               
> Dean
> 2009-06-02

> -------------------------------------------------------------
> 发件人：georg
> 发送日期：2009-06-02 14:51:45
> 收件人：freebsd-questions
> 抄送：
> 主题：fatal trap 12

> Hello, Freebsd-questions.

>    I use FreeBSD 7.2-STABLE amd64. About month ago system was crashed
>    with  "Fatal trap 12"...
>    I bay new hardware and install new FreeBSD 7.2-STABLE amd64. cPanel
>    and ASSP (anti spam proxy). And one a day or two days have this:

>    Fatal trap 12: page fault while in kernel mode
>    cpuid: = 0; apic id = 00
>    fault virtual address     = 0x8000000000
>    fault code                = supervisor write data, page not present
>    instruction pointer       = 0x8:0xffffffff8018b839
>    stack pointer             = 0x10:0xffffff807a25d190
>    frame pointer             = 0x10:0xea5f
>    code segment              = base 0x0, limit 0xfffff, type 0x1b
>                              = DPL 0, pres 1, long 1, def32 0, gran 1
>    processor eflags          = interrupt enabled, resume, IOPL = 0
>    current process           = 59397 (perl5.10.0)
>    trap number               = 12

>    And alway, after crash, I see "current process = perl5.10.0"...

>    Can You help me?


-- 
Regards,                                  mailto:georg at dts.su
Yura