Compiling the Linux kernel 2.0.33 with haifa-enabled egcs 1.0.1 causes a
repeatable kernel oops for me in vortex_open() during ifconfig.
I had used "-O3 -fomit-frame-pointer -mcpu=pentium" as the
architecture-specific settings for a 586. This does not happen with
gcc 2.7.2.1.
Unable to handle kernel paging request at virtual address f6003b0d
current->tss.cr3 = 01d36000,
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<001a7cf6>]
EFLAGS: 00010246
eax: 360036c0 ebx: 01020010 ecx: 00000000 edx: 00006000
esi: 001da00b edi: 01f36f49 ebp: 00001002 esp: 01f36ed4
ds: 0018 es: 0018 fs: 002b gs: 002b ss: 0018
Process ifconfig (pid: 42, process nr: 9, stackpage=01f36000)
Stack: 001f68d0 001da00b 01f36f49 00001002 01fa43d8 01d672e8 00000001 01f36f00
40008000 00000000 bffffd48 01d47414 08003e6a 00008914 00124a05 0010a010
00000000 360036c0 00006000 0013cdc6 001f68d0 bffffd48 01d47414 08003e6a
Call Trace: [<00124a05>] [<0010a010>] [<0013cdc6>] [<0013d687>] [<001544d6>] [<0013a7c1>] [<0012d0f9>]
[<0010a8d5>]
Code: 8a 88 4d 04 00 00 83 e1 07 83 f9 07 74 6c 83 3d 90 6c 1f 00
Using `../System.map' to map addresses to symbols.
>>EIP: 1a7cf6 <vortex_open+3a/768>
Trace: 124a05 <getblk+29/470>
Trace: 10a010 <dump_thread+c8/d0>
Trace: 13cdc6 <dev_ifsioc+2aa/664>
Trace: 13d687 <dev_ioctl+1b7/1f8>
Trace: 1544d6 <inet_ioctl+326/354>
Trace: 13a7c1 <sock_ioctl+1d/24>
Trace: 12d0f9 <sys_ioctl+105/114>
Trace: 10a8d5 <system_call+55/80>
Code: 1a7cf6 <vortex_open+3a/768>
Code: 1a7cf6 <vortex_open+3a/768> 8a 88 4d 04 00 movb 0x44d(%eax),%cl
Code: 1a7cfb <vortex_open+3f/768> 00
Code: 1a7cfc <vortex_open+40/768> 83 e1 07 andl $0x7,%ecx
Code: 1a7cff <vortex_open+43/768> 83 f9 07 cmpl $0x7,%ecx
Code: 1a7d08 <vortex_open+4c/768> 74 6c je 1a7d70 <vortex_open+b4/768>
Code: 1a7d0a <vortex_open+4e/768> 83 3d 90 6c 1f cmpl $0x0,0x1f6c90
Code: 1a7d0f <vortex_open+53/768> 00 00
Code: 1a7d17 <vortex_open+5b/768> 90 nop
Code: 1a7d18 <vortex_open+5c/768> 90 nop
Code: 1a7d19 <vortex_open+5d/768> 90 nop
$ gcc -v
Reading specs from /usr/local/lib/gcc-lib/i586-pc-linux-gnulibc1/egcs-2.90.23/specs
gcc version egcs-2.90.23 980102 (egcs-1.0.1 release)
Here's a disassembly of the 3c59x.o file, up to the relevant place.
00000bc8 <vortex_open>:
bc8: 83 ec 3c subl $0x3c,%esp
bcb: 55 pushl %ebp
bcc: 57 pushl %edi
bcd: 56 pushl %esi
bce: 53 pushl %ebx
bcf: 8b 44 24 50 movl 0x50(%esp,1),%eax
bd3: 8b 54 24 50 movl 0x50(%esp,1),%edx
bd7: 8b 40 14 movl 0x14(%eax),%eax
bda: 89 44 24 48 movl %eax,0x48(%esp,1)
bde: 8b 52 44 movl 0x44(%edx),%edx
be1: 8b 4c 24 48 movl 0x48(%esp,1),%ecx
be5: 89 54 24 44 movl %edx,0x44(%esp,1)
be9: 83 c1 0e addl $0xe,%ecx
bec: b8 03 08 00 00 movl $0x803,%eax
bf1: 89 ca movl %ecx,%edx
bf3: 66 ef outw %ax,(%dx)
bf5: 8b 54 24 48 movl 0x48(%esp,1),%edx
bf9: ed inl (%dx),%eax
bfa: 89 c3 movl %eax,%ebx
bfc: 8b 44 24 44 movl 0x44(%esp,1),%eax
c00: 31 c9 xorl %ecx,%ecx
c02: 8a 88 4d 04 00 movb 0x44d(%eax),%cl
c07: 00
c08: 83 e1 07 andl $0x7,%ecx
c0b: 83 f9 07 cmpl $0x7,%ecx
c0e: 74 6c je c7c <vortex_open+b4>
c10: 83 3d 14 00 00 cmpl $0x1,0x14
[...]
-- Thomas Koenig, Thomas.Koenig@ciw.uni-karlsruhe.de, ig25@dkauni2.bitnet. The joy of engineering is to find a straight line on a double logarithmic diagram.