Thanks Konstantin. [snip]
>>> >>> Looks like degree (%edx) is 1 on anon-vma desruction. >>> Probably I've overlooked some weird conrner case in vma splitting/merging. >>> >>> Could you try this patch. It disables vma merging end eliminates half >>> of complicated paths. >>> As I see merging is optional, everything should work fine without it. >>> >>> --- a/mm/mmap.c >>> +++ b/mm/mmap.c >>> @@ -1048,7 +1048,7 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm, >>> * We later require that vma->vm_flags == vm_flags, >>> * so this tests vma->vm_flags & VM_SPECIAL, too. >>> */ >>> - if (vm_flags & VM_SPECIAL) >>> + if (1) >>> return NULL; >>> >>> if (prev) >>> >>> >>> >>> >>> Code from your oops. >>> >>> Code: 00 ad de 48 89 43 18 e8 c5 f9 00 00 48 8b 45 10 48 8d 55 10 48 >>> 83 e8 10 49 39 d6 74 54 48 8b 7d 08 48 89 eb 8b 57 34 85 d2 74 9e <0f> >>> 0b 0f 1f 40 00 e8 6b fc ff ff eb 9a 66 0f 1f 84 00 00 00 00 >>> All code >>> ======== >>> 0: 00 ad de 48 89 43 add %ch,0x438948de(%rbp) >>> 6: 18 e8 sbb %ch,%al >>> 8: c5 f9 00 (bad) >>> b: 00 48 8b add %cl,-0x75(%rax) >>> e: 45 10 48 8d adc %r9b,-0x73(%r8) >>> 12: 55 push %rbp >>> 13: 10 48 83 adc %cl,-0x7d(%rax) >>> 16: e8 10 49 39 d6 callq 0xffffffffd639492b >>> 1b: 74 54 je 0x71 >>> 1d: 48 8b 7d 08 mov 0x8(%rbp),%rdi >>> 21: 48 89 eb mov %rbp,%rbx >>> 24: 8b 57 34 mov 0x34(%rdi),%edx >>> 27: 85 d2 test %edx,%edx >>> 29: 74 9e je 0xffffffffffffffc9 >>> 2b:* 0f 0b ud2 <-- trapping instruction >>> 2d: 0f 1f 40 00 nopl 0x0(%rax) >>> 31: e8 6b fc ff ff callq 0xfffffffffffffca1 >>> 36: eb 9a jmp 0xffffffffffffffd2 >>> 38: 66 data16 >>> 39: 0f .byte 0xf >>> 3a: 1f (bad) >>> 3b: 84 00 test %al,(%rax) >>> 3d: 00 00 add %al,(%rax) >>> ... >>> >>> Code starting with the faulting instruction >>> =========================================== >>> 0: 0f 0b ud2 >>> 2: 0f 1f 40 00 nopl 0x0(%rax) >>> 6: e8 6b fc ff ff callq 0xfffffffffffffc76 >>> b: eb 9a jmp 0xffffffffffffffa7 >>> d: 66 data16 >>> e: 0f .byte 0xf >>> f: 1f (bad) >>> 10: 84 00 test %al,(%rax) >>> 12: 00 00 add %al,(%rax) >>> >>> >>> +Added Oded Gabbay <oded.gab...@amd.com> into cc, he's reported this >>> problem too. >>> >> Thanks for the fast reply. >> >> I applied the patch and tested it. I wasn't able to reproduce *my* problem, >> so you are definitely in the right direction :) > > Ok. I've found something. Try patch from attachment. > Your patch has fixed the BUG for me. Thank you. Tested-by: Chris Clayton <chris2...@googlemail.com> >> >> Oded >> >>>> >>>> In case it helps, I've attached the xz-compressed related config file. >>>> >>>> Chris >>>> >>>>> >>>>> I've attached the full kernel log file for that boot. >>>>> >>>>> Chris >>>>> >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >>> the body of a message to majord...@vger.kernel.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> Please read the FAQ at http://www.tux.org/lkml/ >>> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
