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Date: Mon, 30 Jun 2003 03:05:35 +0200
To: rwatson@freebsd.org, stable@freebsd.org
From: Gianmarco Giovannelli <gmarco@scotty.masternet.it>
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Subject: Re: apache panics on a recent 4.8-STABLE
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At 30/06/2003, Gianmarco Giovannelli wrote:

>Infact making a little script in this way:
>---> begin <---
>#!/bin/sh
>
>eval `limits -e -U www` >/dev/null 2>&1
>---> end <---
>
>panics the box too ...

If you use csh instead of sh it works ...

This crashes...
---> begin <---
#!/bin/sh

limits -e -U www
--> end <---

This doesn't crash
---> begin <---
#!/bin/csh

limits -e -U www
---> end <---

A little of kernel debugging:

freebsd:/usr/obj/usr/src/sys/FREEBSD# gdb -k
GNU gdb 4.18 (FreeBSD)
Copyright 1998 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-unknown-freebsd".
(kgdb) symbol-file kernel.debug
Reading symbols from kernel.debug...Deprecated bfd_read called at 
/usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/gdb/gdb/dbxread.c 
line 2627 in elfstab_build_psymtabs
Deprecated bfd_read called at 
/usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/gdb/gdb/dbxread.c 
line 933 in fill_symbuf
done.
[...]
orm0: <Option ROM> at iomem 0xcc800-0xd47ff on isa0
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: Generic chipset (ECP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/16 bytes threshold
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
DUMMYNET initialized (011031)
ipfw2 initialized, divert enabled, rule-based forwarding enabled, default 
to deny, logging unlimited
ad0: 19092MB <ST320413A> [38792/16/63] at ata0-master PIO4
acd0: CDROM <CD-ROM Drive/F5E> at ata1-master PIO4
ata1-slave: <IOMEGA ZIP 100 ATAPI/13.A> - NO DRIVER!
Mounting root from ufs:/dev/ad0s1a


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x14
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc124ea3f
stack pointer           = 0x10:0xd16d9ce8
frame pointer           = 0x10:0xd16d9e18
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         = 121 (limits)
interrupt mask          = none
trap number             = 12
panic: page fault

syncing disks... 12 12 12 2 1 1 1
done
Uptime: 46s

dumping to dev #ad/0x20001, offset 524416
dump ata0: resetting devices .. done
255 254 253 252 251 250 249 248 247 246 245 244 243 242 241 240 239 238 237 
236 235 234 233 232 231 230 229 228 227 226 225 224 223 222 221 220 219 218 
217 216 215 214 213 212 211 210 209 208 207 206 205 204 203 202 201 200 199 
198 197 196 195 194 193 192 191 190 189 188 187 186 185 184 183 182 181 180 
179 178 177 176 175 174 173 172 171 170 169 168 167 166 165 164 163 162 161 
160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 144 143 142 
141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 124 123 
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:487
487             if (dumping++) {

(kgdb) where
#0  dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
#1  0xc0169bd3 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:316
#2  0xc0169ff8 in poweroff_wait (junk=0xc026090c, howto=-1071250417) at 
/usr/src/sys/kern/kern_shutdown.c:595
#3  0xc0220c6e in trap_fatal (frame=0xd16d9ca8, eva=20) at 
/usr/src/sys/i386/i386/trap.c:974
#4  0xc0220941 in trap_pfault (frame=0xd16d9ca8, usermode=0, eva=20) at 
/usr/src/sys/i386/i386/trap.c:867
#5  0xc02204ff in trap (frame={tf_fs = -1072103408, tf_es = -781582320, 
tf_ds = 16, tf_edi = -1054504672,
       tf_esi = -872841856, tf_ebp = -781345256, tf_isp = -781345580, 
tf_ebx = -872841856, tf_edx = 3,
       tf_ecx = -872841856, tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip 
= -1054545345, tf_cs = 8,
       tf_eflags = 66178, tf_esp = -781345068, tf_ss = -872841856}) at 
/usr/src/sys/i386/i386/trap.c:466
#6  0xc124ea3f in ?? ()
#7  0xc124f2a8 in ?? ()
#8  0xc019edec in vn_read (fp=0xc1315b00, uio=0xd16d9ed4, cred=0xc125d400, 
flags=0, p=0xcbf97be0) at vnode_if.h:334
#9  0xc0178924 in dofileread (p=0xcbf97be0, fp=0xc1315b00, fd=3, 
buf=0x8050000, nbyte=4096, offset=-1, flags=0)
     at /usr/src/sys/sys/file.h:147
#10 0xc01787ea in read (p=0xcbf97be0, uap=0xd16d9f80) at 
/usr/src/sys/kern/sys_generic.c:117
#11 0xc0220f1d in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47, 
tf_edi = 672172128, tf_esi = 672172128,
       tf_ebp = -1077939296, tf_isp = -781344812, tf_ebx = 672096940, 
tf_edx = 672040824, tf_ecx = 134545408,
       tf_eax = 3, tf_trapno = 12, tf_err = 2, tf_eip = 672050184, tf_cs = 
31, tf_eflags = 663, tf_esp = -1077939340,
       tf_ss = 47}) at /usr/src/sys/i386/i386/trap.c:1175
#12 0xc02144b5 in Xint0x80_syscall ()
#13 0x280d8b92 in ?? ()
#14 0x280d0ae8 in ?? ()
#15 0x8049dab in ?? ()
#16 0x804951e in ?? ()
#17 0x8048caa in ?? ()


I am really not able to provide any further information because my kernel 
knowledge is soo small.
If someone need something else, please ask (providing a step by step 
istruction :-)

Thanks...


Best Regards,
Gianmarco Giovannelli ,  "Unix expert since yesterday"
http://www.gufi.org/~gmarco