On Wed, May 29, 2013 at 01:28:42PM +0800, Wang, Yalin wrote: > Hi all, > I am a new comer to this mailing list , > I am happy to join this community . > I have a bug reported from our android phones which > is caused by the system call . > It seems like kernel bugs from my view . Hmm, how is that Linux-VServer related? What kernel and Linux-VServer patch do you use? Thanks, Herbert > Crash in file arch\arm\kernel\ entry-common.S > #if defined(CONFIG_OABI_COMPAT) > /* > * If we have CONFIG_OABI_COMPAT then we need to look at the swi > * value to determine if it is an EABI or an old ABI call. > */ > #ifdef CONFIG_ARM_THUMB > tst r8, #PSR_T_BIT > movne r10, #0 @ no thumb OABI emulation > ldreq r10, [lr, #-4] @ get SWI instruction // crash at this instruction, when get SWI instruction > #else > ldr r10, [lr, #-4] @ get SWI instruction > A710( and ip, r10, #0x0f000000 @ check for SWI ) > A710( teq ip, #0x0f000000 ) > A710( bne .Larm710bug ) > #endif > #ifdef CONFIG_CPU_ENDIAN_BE8 > rev r10, r10 @ little endian instruction > #endif > Then reason why it will crash when get SWI instruction is maybe > This page is clear to aged by kernel, > But this MMU fault happpened in kernel, > So the kernel do_page_fault function will not clear this page to young, > So that will crash . > It should poll this page to make it present or the fault should be handled by fixup section , > Anyway, this place should not crash by kernel . > The kernel version I used is 3.4.0 > I have add the kernel log and the call stack recoverd by trace32 tools > Pls have a look at it . > Thanks . > Yalin.Wang > Software Engineer > OS Kernel&Graphics > Sony Mobile Communications > Tel: +86 10 5966 9819 > Phone: 18610323092 > Address: No.16 Guangshun South Street, Chaoyang, Beijing, P.R.C. > sonymobile.com<http://sonymobile.com/> > [cid:image001.jpg@01CE5C5F.6BD2AAE0] Content-Description: stack.txt > crash_notes_save_this_cpu(type = CRASH_NOTE_CRASHING, cpu = 1) > update_crash_notes(?, ?, ?) > notifier_call_chain(?, val = 0, v = 0xC0ECBE9C, nr_to_call = 5, nr_calls = 0x0) > __atomic_notifier_call_chain(nh = 0xC0ECC29C, val = 0, v = 0xC0ECBE9C, nr_to_call = -1, nr_calls = 0x0) > atomic_notifier_call_chain(?, ?, ?) > panic(fmt = 0xC098BC02) > die(?, regs = 0xE0601F68, err = 23) > __do_kernel_fault.part.8(mm = 0xC73E7DC0, addr = 1075872796, fsr = 23, regs = 0xE0601F68) > do_page_fault(addr = 3342761408, fsr = 23, regs = 0x4020841C) > do_DataAbort(addr = 1075872796, fsr = 23, regs = 0xE0601F68) > __dabt_svc(asm) > exception > vector_swi(asm) > ret_fast_syscall(asm) > exception > NUR:0xFFFF:0x40208420(asm) > end of frame