Messages in this thread Patch in this message | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: Linux 2.6.3-rc1 | Date | Mon, 9 Feb 2004 02:34:20 +0100 |
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On Monday 09 of February 2004 01:08, Andre Tomt wrote: > Bartlomiej Zolnierkiewicz wrote: > >>>Can you disassemble ide_pci_register_host_proc using gdb? > >> > >>I'd need a walkthrough, not very familiar with gdb other than getting a > >>backtrace out of it > > > > Make sure to enable following options in kernel config: > > CONFIG_DEBUG_KERNEL ("Kernel hacking"->"Kernel debugging" ) and > > CONFIG_DEBUG_INFO ("Kernel debugging"->"Compile the kernel with debug > > info"). > > > > Recompile kernel. > > > > $ gdb /usr/src/linux/vmlinux > > (gdb) disassemble ide_pci_register_host_proc > > > > That's all :-). > > Ahh. However, as ide-core is a module in this case, I had to run gdb on > the module instead. Anyway..
Yep.
> (gdb) disassemble ide_pci_register_host_proc > Dump of assembler code for function ide_pci_register_host_proc: > 0xe940 <ide_pci_register_host_proc>: mov 0x4(%esp,1),%ecx > 0xe944 <ide_pci_register_host_proc+4>: test %ecx,%ecx > 0xe946 <ide_pci_register_host_proc+6>: je 0xe978 > <ide_pci_register_host_proc+56> > 0xe948 <ide_pci_register_host_proc+8>: movl $0x0,0x10(%ecx) > 0xe94f <ide_pci_register_host_proc+15>: movb $0x1,0x4(%ecx) > 0xe953 <ide_pci_register_host_proc+19>: mov 0x3910,%eax > 0xe958 <ide_pci_register_host_proc+24>: test %eax,%eax > 0xe95a <ide_pci_register_host_proc+26>: je 0xe972 > <ide_pci_register_host_proc+50> > 0xe95c <ide_pci_register_host_proc+28>: mov %eax,%edx > 0xe95e <ide_pci_register_host_proc+30>: mov 0x10(%eax),%eax > 0xe961 <ide_pci_register_host_proc+33>: test %eax,%eax > 0xe963 <ide_pci_register_host_proc+35>: je 0xe96e > <ide_pci_register_host_proc+46> > 0xe965 <ide_pci_register_host_proc+37>: mov %eax,%edx
Access to ide_pci_proc_host_list->next.
> 0xe967 <ide_pci_register_host_proc+39>: mov 0x10(%eax),%eax > 0xe96a <ide_pci_register_host_proc+42>: test %eax,%eax > 0xe96c <ide_pci_register_host_proc+44>: jne 0xe965 > <ide_pci_register_host_proc+37> > 0xe96e <ide_pci_register_host_proc+46>: mov %ecx,0x10(%edx) > 0xe971 <ide_pci_register_host_proc+49>: ret > 0xe972 <ide_pci_register_host_proc+50>: mov %ecx,0x3910 > 0xe978 <ide_pci_register_host_proc+56>: ret > End of assembler dump.
Ok thanks, I got the same dump. I think the problem is that memory used by previously registered ide_pci_host_proc_list entry (for pdc202xx_new driver) is already unmapped because of __initdata in pdc202xx_new.h. (This doesn't happen in built-in case because this memory is freed after all drivers are initialized.)
Does this patch help?
linux-2.6.3-rc1-bk1-root/drivers/ide/pci/pdc202xx_new.h | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN drivers/ide/pci/pdc202xx_new.h~pdc202xx_old_oops drivers/ide/pci/pdc202xx_new.h --- linux-2.6.3-rc1-bk1/drivers/ide/pci/pdc202xx_new.h~pdc202xx_old_oops 2004-02-09 02:20:24.816898368 +0100 +++ linux-2.6.3-rc1-bk1-root/drivers/ide/pci/pdc202xx_new.h 2004-02-09 02:20:57.167980256 +0100 @@ -172,7 +172,7 @@ static u8 pdcnew_proc; static int pdcnew_get_info(char *, char **, off_t, int); -static ide_pci_host_proc_t pdcnew_procs[] __initdata = { +static ide_pci_host_proc_t pdcnew_procs[] = { { .name = "pdcnew", .set = 1, _
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