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Subject[BUG] pl2303 oops in 2.4.20-pre10 (and 2.5 too)
On one of my systems, when minicom opens /dev/ttyUSB0 (a PL2303) and
the kernel is 2.4.20-pre10 (compiled with Mandrake 9's gcc 3.2),
minicom segfaults and the kernel oopses.

2.4.19 does not have this problem, whether compiled with gcc 2.96 from
Mandrake 8.2 or gcc 3.2 from Mandrake 9.0. The oops happens with
2.4.20-pre5 and -pre9, 2.5.41, and 2.5.41-ac1 as well.

The decoded oops (from 2.4.20-pre10), and the .config (with blank/comment
lines stripped), follow. FWIW, it's a monolithic kernel (module support
disabled). If any more info or data is needed, I'll try my best to
provide it. This bug is 100% reproducible.

ksymoops 2.4.5 on i686 2.4.19-16mdksmp. Options used
-v vmlinux (specified)
-K (specified)
-L (specified)
-O (specified)
-m System.map (specified)

Unable to handle kernel NULL pointer dereference at virtual address 00000010
c01d8cd8
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c01d8cd8>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000 ebx: c1339400 ecx: 00000021 edx: c134b800
esi: c133941c edi: 00000000 ebp: cd993e9c esp: cd993e2c
ds: 0018 es: 0018 ss: 0018
Process minicom (pid: 110, stackpage=cd993000)
Stack: c133f600 cd993e60 00000001 00000040 00000002 00000004 00000000 00000000
00000064 cd936006 c0295f5c cd993e70 c017b921 cd936000 00000000 00001000
c02e0d20 cd993ebc c0178123 00000000 00000000 00000024 00000000 00000000
Call Trace: [<c017b921>] [<c0178123>] [<c01d57bb>] [<c0178e44>] [<c01413a3>]
[<c015914a>] [<c01378aa>] [<c0136081>] [<c0135fa6>] [<c0140953>] [<c0136351>]
[<c0107417>]
Code: 89 50 10 8b 46 20 89 04 24 e8 5a e9 fe ff 85 c0 75 76 a1 1c


>>EIP; c01d8cd8 <pl2303_open+508/890> <=====

>>ebx; c1339400 <END_OF_CODE+10553a8/????>
>>edx; c134b800 <END_OF_CODE+10677a8/????>
>>esi; c133941c <END_OF_CODE+10553c4/????>
>>ebp; cd993e9c <END_OF_CODE+d6afe44/????>
>>esp; cd993e2c <END_OF_CODE+d6afdd4/????>

Trace; c017b921 <n_tty_open+91/b0>
Trace; c0178123 <init_dev+a3/4d0>
Trace; c01d57bb <serial_open+fb/140>
Trace; c0178e44 <tty_open+244/3d0>
Trace; c01413a3 <link_path_walk+593/710>
Trace; c015914a <ext2_free_blocks+21a/300>
Trace; c01378aa <chrdev_open+5a/60>
Trace; c0136081 <dentry_open+d1/1e0>
Trace; c0135fa6 <filp_open+66/70>
Trace; c0140953 <getname+93/d0>
Trace; c0136351 <sys_open+51/a0>
Trace; c0107417 <system_call+33/38>

Code; c01d8cd8 <pl2303_open+508/890>
00000000 <_EIP>:
Code; c01d8cd8 <pl2303_open+508/890> <=====
0: 89 50 10 mov %edx,0x10(%eax) <=====
Code; c01d8cdb <pl2303_open+50b/890>
3: 8b 46 20 mov 0x20(%esi),%eax
Code; c01d8cde <pl2303_open+50e/890>
6: 89 04 24 mov %eax,(%esp,1)
Code; c01d8ce1 <pl2303_open+511/890>
9: e8 5a e9 fe ff call fffee968 <_EIP+0xfffee968> c01c7640 <usb_submit_urb+0/50>
Code; c01d8ce6 <pl2303_open+516/890>
e: 85 c0 test %eax,%eax
Code; c01d8ce8 <pl2303_open+518/890>
10: 75 76 jne 88 <_EIP+0x88> c01d8d60 <pl2303_open+590/890>
Code; c01d8cea <pl2303_open+51a/890>
12: a1 1c 00 00 00 mov 0x1c,%eax

CONFIG_X86=y
CONFIG_UID16=y
CONFIG_EXPERIMENTAL=y
CONFIG_M686=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_X86_L1_CACHE_SHIFT=5
CONFIG_X86_HAS_TSC=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_PGE=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_PPRO_FENCE=y
CONFIG_X86_F00F_WORKS_OK=y
CONFIG_X86_MCE=y
CONFIG_MICROCODE=y
CONFIG_NOHIGHMEM=y
CONFIG_MTRR=y
CONFIG_X86_UP_APIC=y
CONFIG_X86_UP_IOAPIC=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_TSC=y
CONFIG_NET=y
CONFIG_PCI=y
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_ISA=y
CONFIG_PCI_NAMES=y
CONFIG_HOTPLUG=y
CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
CONFIG_BLK_DEV_FD=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_PACKET=y
CONFIG_NETFILTER=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_IP_ROUTE_VERBOSE=y
CONFIG_INET_ECN=y
CONFIG_SYN_COOKIES=y
CONFIG_IP_NF_COMPAT_IPCHAINS=y
CONFIG_IP_NF_NAT_NEEDED=y
CONFIG_IDE=y
CONFIG_BLK_DEV_IDE=y
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_IDEDISK_MULTI_MODE=y
CONFIG_BLK_DEV_IDECD=y
CONFIG_IDE_TASK_IOCTL=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_BLK_DEV_ADMA=y
CONFIG_BLK_DEV_SIS5513=y
CONFIG_IDEDMA_AUTO=y
CONFIG_BLK_DEV_IDE_MODES=y
CONFIG_NETDEVICES=y
CONFIG_DUMMY=y
CONFIG_NET_ETHERNET=y
CONFIG_NET_PCI=y
CONFIG_PCNET32=y
CONFIG_PPP=y
CONFIG_PPP_ASYNC=y
CONFIG_PPP_DEFLATE=y
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_SERIAL=y
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=256
CONFIG_RTC=y
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_TMPFS=y
CONFIG_RAMFS=y
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
CONFIG_MINIX_FS=y
CONFIG_PROC_FS=y
CONFIG_DEVPTS_FS=y
CONFIG_EXT2_FS=y
CONFIG_MSDOS_PARTITION=y
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_CODEPAGE_850=y
CONFIG_NLS_ISO8859_1=y
CONFIG_NLS_ISO8859_15=y
CONFIG_NLS_UTF8=y
CONFIG_VGA_CONSOLE=y
CONFIG_USB=y
CONFIG_USB_DEVICEFS=y
CONFIG_USB_OHCI=y
CONFIG_USB_SERIAL=y
CONFIG_USB_SERIAL_PL2303=y
CONFIG_ZLIB_INFLATE=y
CONFIG_ZLIB_DEFLATE=y
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