Hello,
We run CRIU tests for linux-next and today they triggered a kernel
bug. I want to mention that this kernel is built with kasan. This bug
was triggered in travis-ci. I can't reproduce it on my host. Without
kasan, kernel crashed but it is impossible to get a kernel log for
this case.
[ 699.207570] BUG: Bad page state in process ip6tables-save pfn:1499f4
[ 699.214542] page:ffffea0005267d00 count:-1 mapcount:0 mapping:
(null) index:0x1
[ 699.222758] flags: 0x17fff8000000000()
[ 699.226632] raw: 017fff8000000000 0000000000000000 0000000000000001
ffffffffffffffff
[ 699.234495] raw: dead000000000100 dead000000000200 0000000000000000
0000000000000000
[ 699.242359] page dumped because: nonzero _count
[ 699.247006] Modules linked in:
[ 699.247022] CPU: 0 PID: 19609 Comm: ip6tables-save Not tainted
4.12.0-rc6-next-20170622 #1
[ 699.247029] Hardware name: Google Google Compute Engine/Google
Compute Engine, BIOS Google 01/01/2011
[ 699.247035] Call Trace:
[ 699.247054] dump_stack+0x85/0xc2
[ 699.247070] bad_page+0xea/0x160
[ 699.247086] check_new_page_bad+0xc2/0xe0
[ 699.247103] get_page_from_freelist+0xfec/0x1270
[ 699.247161] __alloc_pages_nodemask+0x1cf/0x4b0
[ 699.247188] ? __alloc_pages_slowpath+0x1610/0x1610
[ 699.247214] ? mark_lock+0x6d/0x860
[ 699.247223] ? alloc_set_pte+0x7db/0x8f0
[ 699.247247] alloc_pages_vma+0x85/0x250
[ 699.247270] wp_page_copy+0x13c/0xad0
[ 699.247285] ? do_wp_page+0x292/0x9a0
[ 699.247309] ? lock_downgrade+0x2c0/0x2c0
[ 699.247320] ? __do_fault+0x140/0x140
[ 699.247341] ? do_raw_spin_unlock+0x88/0x130
[ 699.247361] do_wp_page+0x29a/0x9a0
[ 699.247386] ? finish_mkwrite_fault+0x250/0x250
[ 699.247403] ? do_raw_spin_lock+0x93/0x120
[ 699.247427] __handle_mm_fault+0xb94/0x1790
[ 699.247450] ? __pmd_alloc+0x270/0x270
[ 699.247466] ? find_held_lock+0x119/0x150
[ 699.247528] handle_mm_fault+0x235/0x490
[ 699.247553] __do_page_fault+0x332/0x680
[ 699.247586] do_page_fault+0x22/0x30
[ 699.247601] page_fault+0x28/0x30
[ 699.247609] RIP: 0033:0x2aaea0abef2b
[ 699.247616] RSP: 002b:00007ffe1deecd20 EFLAGS: 00010206
[ 699.247628] RAX: 00002aaea12f6e60 RBX: 000000037ffff1a0 RCX: 0000000000000028
[ 699.247635] RDX: 00002aaea12f6f10 RSI: 00002aaea0af0040 RDI: 00002aaea10ec000
[ 699.247642] RBP: 00007ffe1deece70 R08: 000000006fffffff R09: 0000000070000021
[ 699.247649] R10: 0000000000000031 R11: 000000006ffffdff R12: 00002aaea0af0000
[ 699.247655] R13: 00007ffe1deecf40 R14: 0000000000000003 R15: 000000006ffffeff
[ 699.247697] Disabling lock debugging due to kernel taint
Here is a whole log: https://goo.gl/5xekS3
Thanks,
Andrei
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