On 11-02-19 11:54 PM, Mark Lord wrote: > On 11-02-19 07:05 PM, Ted Ts'o wrote: >> On Sat, Feb 19, 2011 at 05:37:20PM -0500, Mark Lord wrote: >>> 32-bit x86 system, 2.6.37 SMP kernel, Core2duo, 3.3GB RAM, no swap. >>> >>> The system just suddenly switched to fbconsole and dumped a traceback. >>> Here's the screen-shot photo: http://rtr.ca/ext4_crash.jpg >>> >>> Is this a known bug that got fixed in 2.6.37.1 ? >> >> No, this looks like a new one. >> >> And I can't make the Code: line make sense. Can you send me the >> fs/ext4/mballoc.s file after running the command "make >> fs/ext4/mballoc.s" in your build tree where you built this kernel? > > Sent. And here's an extract: > > .globl ext4_discard_preallocations > .type ext4_discard_preallocations, @function > ext4_discard_preallocations: > pushl %ebp # > pushl %edi # > leal -136(%eax), %edi #, ei > pushl %esi # > pushl %ebx # > subl $80, %esp #, > movl 172(%eax), %esi # <variable>.i_sb, sb > movl $0, 76(%esp) #, group > movzwl 122(%eax), %edx # <variable>.i_mode, tmp85 > andl $61440, %edx #, tmp85 > cmpl $32768, %edx #, tmp85 > jne .L875 #, > leal 68(%esp), %edx #, tmp86 > leal 380(%eax), %ebx #, D.45176 > movl %edx, 68(%esp) # tmp86, list.next > addl $372, %eax #, > movl %edx, 72(%esp) # tmp86, list.prev > movl %eax, 28(%esp) #, %sfp > .L876: > movl %ebx, %eax # D.45176, > call _raw_spin_lock # > jmp .L861 # > .L867: > cmpl %ebx, 60(%ebp) # D.45176, <variable>.pa_obj_lock > je .L862 #, > #APP > # 3810 "fs/ext4/mballoc.c" 1 > 1: ud2 > > I wonder if the 003c offset is that "cmpl %ebx, 60(%ebp)" line? I suppose it must be, as there's no other 0x3c offset in that function. Which means it's probably this line that's crashing: BUG_ON(pa->pa_obj_lock != &ei->i_prealloc_lock); ...which could only happen if "pa" was NULL there. I wonder how that happened ? -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
