Date: Thu, 5 Jul 2001 22:38:45 +0200 (CEST) From: Thomas Quinot <thomas@cuivre.fr.eu.org> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/28736: sysctl -a: kernel trap 12. Message-ID: <20010705203845.1F87024D08@melusine.cuivre.fr.eu.org>
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>Number: 28736
>Category: kern
>Synopsis: sysctl -a: kernel trap 12.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Jul 05 13:40:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Thomas Quinot
>Release: FreeBSD 4.3-STABLE i386
>Organization:
>Environment:
System: FreeBSD melusine.cuivre.fr.eu.org 4.3-STABLE FreeBSD 4.3-STABLE #6: Wed Jun 20 17:13:34 CEST 2001 thomas@melusine.cuivre.fr.eu.org:/usr/obj/usr/src/sys/MELUSINE i386
>Description:
Running 'sysctl -a' reproduceably causes a null pointer dereference
in kernel:
Script started on Thu Jul 5 22:31:02 2001
(root@melusine) /var/crash # gdb -k /usr/obj/usr/src/sys/MELUSINE/kernel.debug vmcore.3
GNU gdb 4.18
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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-unknown-freebsd"...
IdlePTD 4087808
initial pcb at 343a60
panicstr: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x14
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc0176bf9
stack pointer = 0x10:0xc8f28e00
frame pointer = 0x10:0xc8f28e10
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 1633 (sysctl)
interrupt mask = none
trap number = 12
panic: page fault
syncing disks... 13 2 1 1
done
Uptime: 24m20s
dumping to dev #ad/0x20009, offset 270360
dump ata0: resetting devices .. done
127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:472
472 if (dumping++) {
(kgdb) bt
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:472
#1 0xc016d765 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:312
#2 0xc016dafd in panic (fmt=0xc02ec7cf "page fault")
at /usr/src/sys/kern/kern_shutdown.c:559
#3 0xc02a4506 in trap_fatal (frame=0xc8f28dc0, eva=20)
at /usr/src/sys/i386/i386/trap.c:951
#4 0xc02a41c5 in trap_pfault (frame=0xc8f28dc0, usermode=0, eva=20)
at /usr/src/sys/i386/i386/trap.c:844
#5 0xc02a3d6b in trap (frame={tf_fs = -923664368, tf_es = -1071382512,
tf_ds = -1070333936, tf_edi = 20, tf_esi = -923627932,
tf_ebp = -923628016, tf_isp = -923628052, tf_ebx = -1060872140,
tf_edx = -1070599904, tf_ecx = -1, tf_eax = -1060872192, tf_trapno = 12,
tf_err = 0, tf_eip = -1072206855, tf_cs = 8, tf_eflags = 66054,
tf_esp = 2, tf_ss = -923627932}) at /usr/src/sys/i386/i386/trap.c:443
#6 0xc0176bf9 in sysctl_disks (oidp=0xc02ff120, arg1=0x0, arg2=0,
req=0xc8f28e64) at /usr/src/sys/kern/subr_disk.c:149
#7 0xc017223d in sysctl_root (oidp=0x0, arg1=0xc8f28ef4, arg2=2,
req=0xc8f28e64) at /usr/src/sys/kern/kern_sysctl.c:1033
#8 0xc0172401 in userland_sysctl (p=0xc857f440, name=0xc8f28ef4, namelen=2,
old=0x0, oldlenp=0xbfbfeedc, inkernel=0, new=0x0, newlen=0,
retval=0xc8f28ef0) at /usr/src/sys/kern/kern_sysctl.c:1126
#9 0xc01722a8 in __sysctl (p=0xc857f440, uap=0xc8f28f80)
at /usr/src/sys/kern/kern_sysctl.c:1062
#10 0xc02a47a6 in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = 0, tf_esi = 2, tf_ebp = -1077940600, tf_isp = -923627564,
tf_ebx = -1077938344, tf_edx = -1077940516, tf_ecx = 0, tf_eax = 202,
tf_trapno = 12, tf_err = 2, tf_eip = 134559840, tf_cs = 31,
tf_eflags = 643, tf_esp = -1077940660, tf_ss = 47})
at /usr/src/sys/i386/i386/trap.c:1150
#11 0xc0296015 in Xint0x80_syscall ()
#12 0x8048ab5 in ?? ()
#13 0x8048fe7 in ?? ()
#14 0x8048307 in ?? ()
#15 0x8048137 in ?? ()
(kgdb) fr 6
#6 0xc0176bf9 in sysctl_disks (oidp=0xc02ff120, arg1=0x0, arg2=0,
req=0xc8f28e64) at /usr/src/sys/kern/subr_disk.c:149
149 error = SYSCTL_OUT(req, disk->d_dev->si_name, strlen(disk->d_dev->si_name));
(kgdb) print disk
$1 = (struct disk *) 0x0
(kgdb) quit
The following dmesg snippet might be relevant (some of the disk
structures corresponding to the SCSI CD bruner get removed?)
ad0: 6149MB <QUANTUM FIREBALL EX6.4A> [13328/15/63] at ata0-master UDMA33
ad1: 14324MB <QUANTUM FIREBALLlct15 15> [29104/16/63] at ata0-slave UDMA33
acd0: DVD-ROM <Pioneer DVD-ROM ATAPIModel DVD-105S 0122> at ata1-master using PIO4
Waiting 3 seconds for SCSI devices to settle
sa0 at sym0 bus 0 target 5 lun 0
sa0: <HP C1533A HP00> Removable Sequential Access SCSI-2 device
sa0: 10.000MB/s transfers (10.000MHz, offset 8)
Mounting root from ufs:/dev/ad1s1a
WARNING: / was not properly dismounted
da0 at sym0 bus 0 target 6 lun 0
da0: <IBM DDRS-39130W S71D> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled
da0: 8715MB (17850000 512 byte sectors: 255H 63S/T 1111C)
(cd0:sym0:0:2:0): got CAM status 0x4c
(cd0:sym0:0:2:0): fatal error, failed to attach to device
(cd0:sym0:0:2:0): lost device
(cd0:sym0:0:2:0): removing device entry
See also PR kern/24596 for a similar problem noted in sysinstall.
At this site, the above CAM messages have probably appeared about
at the same time as the panics.
>How-To-Repeat:
sysctl -a
>Fix:
None known so far.
>Release-Note:
>Audit-Trail:
>Unformatted:
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