Gilles Chanteperdrix wrote:
> Jan Kiszka wrote:
>> Gilles Chanteperdrix wrote:
>>> Jan Kiszka wrote:
>>>> Gilles Chanteperdrix wrote:
>>>>> Jan Kiszka wrote:
>>>>>> BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
>>> Ok. Maybe printing pgd_page_vaddr(*pgd) and pgd_page_vaddr(*pgd_ref)
>>> would help ?
>> I don't see yet where you want to go. As I said, the issue is rare. I
>> rather think we need to approach it theoretically.
>
> Well the bug happens when the two virtual addresses are different (so, I
> do not think my original remark applies). So, I want to see what the two
> addresses look like, for instance if they are not 0 or ~0.
OK, will forward the request.
Not sure if this gives more context, but here is also the ipipe trace
that came with the oops:
...
| #func -14 notify_die+0xd (do_invalid_op+0x7a)
| #func -15 do_invalid_op+0x10
(__ipipe_handle_exception+0x18e)
| +func -15 __ipipe_handle_exception+0x16 (error_sti+0x1e)
+func -16 vmalloc_sync_one+0x16
(__ipipe_pin_range_globally+0x9a)
+func -16 page_to_pfn+0x9
(__ipipe_pin_range_globally+0x7d)
+func -17 _spin_lock+0x9 (__ipipe_pin_range_globally+0x68)
+func -17 __ipipe_pin_range_globally+0x16
(map_vm_area+0x29f)
+func -17 page_to_pfn+0x9 (map_vm_area+0x226)
+func -18 page_to_pfn+0x9 (map_vm_area+0x226)
+func -18 page_to_pfn+0x9 (map_vm_area+0x226)
+func -18 page_to_pfn+0x9 (map_vm_area+0x226)
+func -19 map_vm_area+0x16 (__vmalloc_area_node+0x173)
+func -19 page_to_pfn+0x9 (__alloc_pages+0x357)
| +end 0x80000000 -19 __ipipe_unstall_root+0x5e
(__ipipe_restore_root+0x2c)
| #begin 0x80000000 -19 __ipipe_unstall_root+0x1b
(__ipipe_restore_root+0x2c)
#func -20 __ipipe_unstall_root+0x9
(__ipipe_restore_root+0x2c)
#func -20 __ipipe_restore_root+0x9
(get_page_from_freelist+0x3c8)
#func -20 __inc_zone_state+0x9 (zone_statistics+0x69)
#func -20 __inc_zone_state+0x9 (zone_statistics+0x4a)
#func -20 zone_statistics+0xc
(get_page_from_freelist+0x3b3)
+func -20 ipipe_check_context+0xe
(get_page_from_freelist+0x26a)
+func -20 ipipe_check_context+0xe
(get_page_from_freelist+0x239)
+func -20 zone_watermark_ok+0xa
(get_page_from_freelist+0x169)
+func -20 get_page_from_freelist+0x16 (__alloc_pages+0x6f)
+func -21 cond_resched+0x9 (__alloc_pages+0x47)
+func -21 ipipe_check_context+0xe (__alloc_pages+0x42)
+func -21 __alloc_pages+0x16 (alloc_pages_current+0x7d)
+func -21 zonelist_policy+0x9 (alloc_pages_current+0x70)
+func -21 alloc_pages_current+0xc
(__vmalloc_area_node+0xc9)
+func -21 page_to_pfn+0x9 (__alloc_pages+0x357)
| +end 0x80000000 -21 __ipipe_unstall_root+0x5e
(__ipipe_restore_root+0x2c)
| #begin 0x80000000 -21 __ipipe_unstall_root+0x1b
(__ipipe_restore_root+0x2c)
#func -21 __ipipe_unstall_root+0x9
(__ipipe_restore_root+0x2c)
#func -21 __ipipe_restore_root+0x9
(get_page_from_freelist+0x3c8)
#func -22 __inc_zone_state+0x9 (zone_statistics+0x69)
#func -22 __inc_zone_state+0x9 (zone_statistics+0x4a)
#func -22 zone_statistics+0xc
(get_page_from_freelist+0x3b3)
+func -22 ipipe_check_context+0xe
(get_page_from_freelist+0x26a)
+func -22 ipipe_check_context+0xe
(get_page_from_freelist+0x239)
+func -22 zone_watermark_ok+0xa
(get_page_from_freelist+0x169)
+func -22 get_page_from_freelist+0x16 (__alloc_pages+0x6f)
+func -22 cond_resched+0x9 (__alloc_pages+0x47)
+func -22 ipipe_check_context+0xe (__alloc_pages+0x42)
+func -23 __alloc_pages+0x16 (alloc_pages_current+0x7d)
+func -23 zonelist_policy+0x9 (alloc_pages_current+0x70)
+func -23 alloc_pages_current+0xc
(__vmalloc_area_node+0xc9)
+func -23 page_to_pfn+0x9 (__alloc_pages+0x357)
| +end 0x80000000 -23 __ipipe_unstall_root+0x5e
(__ipipe_restore_root+0x2c)
| #begin 0x80000000 -23 __ipipe_unstall_root+0x1b
(__ipipe_restore_root+0x2c)
#func -23 __ipipe_unstall_root+0x9
(__ipipe_restore_root+0x2c)
#func -23 __ipipe_restore_root+0x9
(get_page_from_freelist+0x3c8)
#func -23 __inc_zone_state+0x9 (zone_statistics+0x69)
#func -24 __inc_zone_state+0x9 (zone_statistics+0x4a)
#func -24 zone_statistics+0xc
(get_page_from_freelist+0x3b3)
+func -24 ipipe_check_context+0xe
(get_page_from_freelist+0x26a)
+func -24 ipipe_check_context+0xe
(get_page_from_freelist+0x239)
+func -24 zone_watermark_ok+0xa
(get_page_from_freelist+0x169)
+func -24 get_page_from_freelist+0x16 (__alloc_pages+0x6f)
+func -24 cond_resched+0x9 (__alloc_pages+0x47)
+func -24 ipipe_check_context+0xe (__alloc_pages+0x42)
+func -25 __alloc_pages+0x16 (alloc_pages_current+0x7d)
+func -25 zonelist_policy+0x9 (alloc_pages_current+0x70)
+func -25 alloc_pages_current+0xc
(__vmalloc_area_node+0xc9)
+func -25 page_to_pfn+0x9 (__alloc_pages+0x357)
| +end 0x80000000 -25 __ipipe_unstall_root+0x5e
(__ipipe_restore_root+0x2c)
| #begin 0x80000000 -25 __ipipe_unstall_root+0x1b
(__ipipe_restore_root+0x2c)
#func -25 __ipipe_unstall_root+0x9
(__ipipe_restore_root+0x2c)
#func -25 __ipipe_restore_root+0x9
(get_page_from_freelist+0x3c8)
#func -26 __inc_zone_state+0x9 (zone_statistics+0x69)
#func -26 __inc_zone_state+0x9 (zone_statistics+0x4a)
#func -26 zone_statistics+0xc
(get_page_from_freelist+0x3b3)
+func -27 ipipe_check_context+0xe
(get_page_from_freelist+0x26a)
+func -27 ipipe_check_context+0xe
(get_page_from_freelist+0x239)
+func -27 zone_watermark_ok+0xa
(get_page_from_freelist+0x169)
+func -27 get_page_from_freelist+0x16 (__alloc_pages+0x6f)
+func -27 cond_resched+0x9 (__alloc_pages+0x47)
+func -27 ipipe_check_context+0xe (__alloc_pages+0x42)
+func -27 __alloc_pages+0x16 (alloc_pages_current+0x7d)
--
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
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