Hi Kirill,
I've hit the following while fuzzing with trinity on the latest -next kernel:
[ 321.348184] page:ffffea0011a20080 count:1 mapcount:1 mapping:ffff8802d745f601 index:0x1802
[ 321.350607] flags: 0x320035c00040078(uptodate|dirty|lru|active|swapbacked)
[ 321.453706] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[ 321.455353] page->mem_cgroup:ffff880286620000
[ 321.456482] ------------[ cut here ]------------
[ 321.457158] kernel BUG at mm/huge_memory.c:3272!
[ 321.457811] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 321.458598] Modules linked in:
[ 321.459057] CPU: 18 PID: 24106 Comm: trinity-c129 Not tainted 4.4.0-rc2-next-20151127-sasha-00012-gf0498ca-dirty #2661
[ 321.460516] task: ffff880042fd2000 ti: ffff8800428c0000 task.ti: ffff8800428c0000
[ 321.461732] RIP: split_huge_page_to_list (mm/huge_memory.c:3272 (discriminator 1))
[ 321.464004] RSP: 0000:ffff8800428c71d0 EFLAGS: 00010246
[ 321.464733] RAX: ffff880042fd2000 RBX: ffffea0011a20080 RCX: 0000000000000000
[ 321.465735] RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffffed0008518e1f
[ 321.466719] RBP: ffff8800428c72b0 R08: fffffbfff4f9eaf1 R09: ffffffffa7cf578f
[ 321.467704] R10: ffffed0105fe6293 R11: 1ffffffff4f9eaed R12: ffffea0011a20060
[ 321.468702] R13: ffffea0011a200a0 R14: ffffea0011a20080 R15: ffff8800428c7300
[ 321.469718] FS: 00007f9d611bb700(0000) GS:ffff880686800000(0000) knlGS:0000000000000000
[ 321.470807] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 321.471608] CR2: 0000000001b54fe8 CR3: 0000000042869000 CR4: 00000000000006a0
[ 321.472633] DR0: 00007f9d5cb76000 DR1: 0000000000000000 DR2: 0000000000000000
[ 321.473612] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 321.474619] Stack:
[ 321.474935] ffff8800428c7300 ffff8800428c72b0 ffffffff9950f2c8 dffffc0000000000
[ 321.476071] 0000000041b58ab3 ffffffffa4871335 ffffffff9950f0c0 dffffc0000000000
[ 321.477184] ffffea0011a20000 0000000000000000 0000000000000000 0000000000000001
[ 321.478297] Call Trace:
[ 321.481234] deferred_split_scan (mm/huge_memory.c:3392)
[ 321.484688] shrink_slab (mm/vmscan.c:354 mm/vmscan.c:446)
[ 321.488008] shrink_zone (mm/vmscan.c:2449)
[ 321.493105] do_try_to_free_pages (mm/vmscan.c:2600 mm/vmscan.c:2650)
[ 321.496657] try_to_free_pages (mm/vmscan.c:2858)
[ 321.498346] __alloc_pages_nodemask (mm/page_alloc.c:2878 mm/page_alloc.c:2896 mm/page_alloc.c:3149 mm/page_alloc.c:3260)
[ 321.508819] alloc_pages_vma (mm/mempolicy.c:2042)
[ 321.509629] wp_page_copy.isra.41 (mm/memory.c:2064)
[ 321.512347] do_wp_page (mm/memory.c:2339)
[ 321.518569] handle_mm_fault (mm/memory.c:3302 mm/memory.c:3396 mm/memory.c:3425)
[ 321.527500] __do_page_fault (arch/x86/mm/fault.c:1239)
[ 321.528411] do_page_fault (arch/x86/mm/fault.c:1301 include/linux/context_tracking_state.h:30 include/linux/context_tracking.h:50 arch/x86/mm/fault.c:1302)
[ 321.530053] do_async_page_fault (./arch/x86/include/asm/traps.h:82 arch/x86/kernel/kvm.c:264)
[ 321.532125] async_page_fault (arch/x86/entry/entry_64.S:989)
[ 321.533057] Code: ea 03 80 3c 02 00 74 08 48 89 df e8 58 4d fe ff 48 8b 03 a8 01 75 16 e8 7c 51 fe ff 48 c7 c6 80 3c 4f a2 4c 89 f7 e8 2d 84 f5 ff <0f> 0b e8 66 51 fe ff 48 8b 55 c8 48 b8 00 00 00 00 00 fc ff df
All code
========
0: ea (bad)
1: 03 80 3c 02 00 74 add 0x7400023c(%rax),%eax
7: 08 48 89 or %cl,-0x77(%rax)
a: df e8 fucomip %st(0),%st
c: 58 pop %rax
d: 4d fe rex.WRB (bad)
f: ff 48 8b decl -0x75(%rax)
12: 03 a8 01 75 16 e8 add -0x17e98aff(%rax),%ebp
18: 7c 51 jl 0x6b
1a: fe (bad)
1b: ff 48 c7 decl -0x39(%rax)
1e: c6 80 3c 4f a2 4c 89 movb $0x89,0x4ca24f3c(%rax)
25: f7 e8 imul %eax
27: 2d 84 f5 ff 0f sub $0xffff584,%eax
2c: 0b e8 or %eax,%ebp
2e: 66 51 push %cx
30: fe (bad)
31: ff 48 8b decl -0x75(%rax)
34: 55 push %rbp
35:* c8 48 b8 00 enterq $0xb848,$0x0 <-- trapping instruction
39: 00 00 add %al,(%rax)
3b: 00 00 add %al,(%rax)
3d: fc cld
3e: ff df lcallq *<internal disassembler error>
...
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: e8 66 51 fe ff callq 0xfffffffffffe516d
7: 48 8b 55 c8 mov -0x38(%rbp),%rdx
b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
12: fc ff df
...
[ 321.537072] RIP split_huge_page_to_list (mm/huge_memory.c:3272 (discriminator 1))
[ 321.537942] RSP <ffff8800428c71d0>
--
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