mm: kernel BUG at mm/huge_memory.c:1371!

DISCUSSION Sasha Levin 2 participants 6 messages Feb 21, 2014 – Apr 10, 2014 Memory management

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Sasha Levin

author

2014-02-21 22:46 UTC #0 lore raw

Hi all,

While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled on the following (now with pretty line numbers!) spew:

[  746.125099] kernel BUG at mm/huge_memory.c:1371!
[  746.125775] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[  746.126774] Dumping ftrace buffer:
[  746.127484]    (ftrace buffer empty)
[  746.127781] Modules linked in:
[  746.128358] CPU: 2 PID: 19816 Comm: trinity-c127 Tainted: G        W 3.14.0-rc3-next-20140221-sasha-00008-g0e660cf-dirty #114
[  746.130196] task: ffff8803a7cc3000 ti: ffff8803a7f1c000 task.ti: ffff8803a7f1c000
[  746.130317] RIP: 0010:[<mm/huge_memory.c:1371>]  [<mm/huge_memory.c:1371>] zap_huge_pmd+0x17a/0x200
[  746.130317] RSP: 0018:ffff8803a7f1dca8  EFLAGS: 00010246
[  746.130317] RAX: ffff8801ab4ac000 RBX: ffff8803a7f1ddd8 RCX: 000000000000002e
[  746.130317] RDX: 0000000000000000 RSI: ffff8803a7cc3d00 RDI: 000000000172c000
[  746.130317] RBP: ffff8803a7f1dce8 R08: 0000000000000000 R09: 0000000000000000
[  746.130317] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0006a8fa00
[  746.130317] R13: ffffea0005cb0000 R14: 00007f784f800000 R15: 00007f785750bfff
[  746.130317] FS:  00007f785afbc700(0000) GS:ffff8801abc00000(0000) knlGS:0000000000000000
[  746.130317] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  746.130317] CR2: 0000000000000010 CR3: 00000003a9739000 CR4: 00000000000006e0
[  746.130317] DR0: 0000000000693000 DR1: 0000000000000000 DR2: 0000000000000000
[  746.130317] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[  746.130317] Stack:
[  746.130317]  00000000000004de ffff8803a9777390 ffff8803a7f1dce8 ffff8803a2afd3e0
[  746.130317]  00007f784f800000 00007f785750c000 ffff8803a7f1ddd8 00007f785750bfff
[  746.130317]  ffff8803a7f1dd78 ffffffff81285536 00000000001d8500 00007f784fa00000
[  746.130317] Call Trace:
[  746.130317]  [<mm/memory.c:1231 mm/memory.c:1265 mm/memory.c:1290>] unmap_page_range+0x2c6/0x410
[  746.130317]  [<mm/memory.c:1338>] unmap_single_vma+0xf1/0x110
[  746.130317]  [<mm/memory.c:1390>] zap_page_range+0x121/0x170
[  746.130317]  [<mm/madvise.c:271 mm/madvise.c:371>] madvise_vma+0x180/0x1c0
[  746.130317]  [<mm/madvise.c:518 mm/madvise.c:448>] SyS_madvise+0x17e/0x250
[  746.130317]  [<arch/x86/kernel/entry_64.S:749>] tracesys+0xdd/0xe2
[  746.152464] Code: 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 81 80 60 03 00 00 00 fe ff ff 49 8b 45 00 f6 c4 40 75 18 31 f6 4c 89 ef e8 26 29 f9 ff <0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 ff 48
[  746.152464] RIP  [<mm/huge_memory.c:1371>] zap_huge_pmd+0x17a/0x200
[  746.152464]  RSP <ffff8803a7f1dca8>

Thanks,
Sasha

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Kirill A. Shutemov

2014-02-21 23:51 UTC #1 lore raw

Quoted 6 lines · Sasha Levin

Hi all,
While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled on the following (now with pretty line numbers!) spew:
[  746.125099] kernel BUG at mm/huge_memory.c:1371!

It "VM_BUG_ON_PAGE(!PageHead(page), page);", correct? I don't see dump_page() output.

Quoted 44 lines

[  746.125775] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[  746.126774] Dumping ftrace buffer:
[  746.127484]    (ftrace buffer empty)
[  746.127781] Modules linked in:
[  746.128358] CPU: 2 PID: 19816 Comm: trinity-c127 Tainted: G        W
3.14.0-rc3-next-20140221-sasha-00008-g0e660cf-dirty #114
[  746.130196] task: ffff8803a7cc3000 ti: ffff8803a7f1c000 task.ti: ffff8803a7f1c000
[  746.130317] RIP: 0010:[<mm/huge_memory.c:1371>]  [<mm/huge_memory.c:1371>] zap_huge_pmd+0x17a/0x200
[  746.130317] RSP: 0018:ffff8803a7f1dca8  EFLAGS: 00010246
[  746.130317] RAX: ffff8801ab4ac000 RBX: ffff8803a7f1ddd8 RCX: 000000000000002e
[  746.130317] RDX: 0000000000000000 RSI: ffff8803a7cc3d00 RDI: 000000000172c000
[  746.130317] RBP: ffff8803a7f1dce8 R08: 0000000000000000 R09: 0000000000000000
[  746.130317] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0006a8fa00
[  746.130317] R13: ffffea0005cb0000 R14: 00007f784f800000 R15: 00007f785750bfff
[  746.130317] FS:  00007f785afbc700(0000) GS:ffff8801abc00000(0000) knlGS:0000000000000000
[  746.130317] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  746.130317] CR2: 0000000000000010 CR3: 00000003a9739000 CR4: 00000000000006e0
[  746.130317] DR0: 0000000000693000 DR1: 0000000000000000 DR2: 0000000000000000
[  746.130317] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[  746.130317] Stack:
[  746.130317]  00000000000004de ffff8803a9777390 ffff8803a7f1dce8 ffff8803a2afd3e0
[  746.130317]  00007f784f800000 00007f785750c000 ffff8803a7f1ddd8 00007f785750bfff
[  746.130317]  ffff8803a7f1dd78 ffffffff81285536 00000000001d8500 00007f784fa00000
[  746.130317] Call Trace:
[  746.130317]  [<mm/memory.c:1231 mm/memory.c:1265 mm/memory.c:1290>] unmap_page_range+0x2c6/0x410
[  746.130317]  [<mm/memory.c:1338>] unmap_single_vma+0xf1/0x110
[  746.130317]  [<mm/memory.c:1390>] zap_page_range+0x121/0x170
[  746.130317]  [<mm/madvise.c:271 mm/madvise.c:371>] madvise_vma+0x180/0x1c0
[  746.130317]  [<mm/madvise.c:518 mm/madvise.c:448>] SyS_madvise+0x17e/0x250
[  746.130317]  [<arch/x86/kernel/entry_64.S:749>] tracesys+0xdd/0xe2
[  746.152464] Code: 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 81 80 60 03
00 00 00 fe ff ff 49 8b 45 00 f6 c4 40 75 18 31 f6 4c 89 ef e8 26 29 f9 ff
<0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 ff 48
[  746.152464] RIP  [<mm/huge_memory.c:1371>] zap_huge_pmd+0x17a/0x200
[  746.152464]  RSP <ffff8803a7f1dca8>

Thanks,
Sasha
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Signature · 7 lines

 Kirill A. Shutemov

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the body to [email protected].  For more info on Linux MM,
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Sasha Levin

author

2014-02-22 01:10 UTC #2 lore raw

Quoted 9 lines · Kirill A. Shutemov

Quoted 6 lines · Sasha Levin
Quoted 6 lines
Hi all,
While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled on the following (now with pretty line numbers!) spew:
[  746.125099] kernel BUG at mm/huge_memory.c:1371!
It "VM_BUG_ON_PAGE(!PageHead(page), page);", correct? I don't see dump_page() output.

Right. However, I'm not seeing the dump_page() output in the log.

I see that dump_page() has been modified not long ago, I'm looking into it.

Thanks,
Sasha

Sasha Levin

author

2014-02-28 17:20 UTC #3 lore raw

Quoted 7 lines · Sasha Levin

Quoted 6 lines · Kirill A. Shutemov
Quoted 5 lines · Sasha Levin
Quoted 5 lines
Hi all,
While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled on the following (now with pretty line numbers!) spew:

Quoted 7 lines

Quoted 3 lines
Quoted 1 line
Quoted 1 line
[  746.125099] kernel BUG at mm/huge_memory.c:1371!
It "VM_BUG_ON_PAGE(!PageHead(page), page);", correct? I don't see dump_page() output.
Right. However, I'm not seeing the dump_page() output in the log.
I see that dump_page() has been modified not long ago, I'm looking into it.

Alright, here we go:

[ 3323.062742] page:ffffea00080f0000 count:3 mapcount:0 mapping:ffff8802292ee0e1 index:0x7fa2e6800
[ 3323.065978] page flags: 0x16fffff80090018(uptodate|dirty|swapcache|swapbacked)
[ 3323.068535] ------------[ cut here ]------------
[ 3323.069669] kernel BUG at mm/huge_memory.c:1371!
[ 3323.070961] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 3323.071028] Dumping ftrace buffer:
[ 3323.071028]    (ftrace buffer empty)
[ 3323.071028] Modules linked in:
[ 3323.071028] CPU: 101 PID: 48284 Comm: trinity-c101 Tainted: G        W 3.14.0-rc4-next-20140228-sasha-00011-g4077c67 #25
[ 3323.071028] task: ffff8800c2718000 ti: ffff8800c26ec000 task.ti: ffff8800c26ec000
[ 3323.071028] RIP: 0010:[<ffffffff812c083a>]  [<ffffffff812c083a>] zap_huge_pmd+0x17a/0x200
[ 3323.071028] RSP: 0018:ffff8800c26edc78  EFLAGS: 00010246
[ 3323.071028] RAX: ffff88022febc000 RBX: ffff8800c26edde8 RCX: 0000000000000040
[ 3323.071028] RDX: 0000000000000000 RSI: ffff8800c2718cc0 RDI: 000000000203c000
[ 3323.071028] RBP: ffff8800c26edcb8 R08: 0000000000000000 R09: 0000000000000000
[ 3323.071028] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0008b9e240
[ 3323.071028] R13: ffffea00080f0000 R14: 00007fa2e6800000 R15: 00007fa2ffffffff
[ 3323.071028] FS:  00007fa31e1b8700(0000) GS:ffff880230600000(0000) knlGS:0000000000000000
[ 3323.071028] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3323.071028] CR2: 00007fa31e1e8990 CR3: 0000000005c25000 CR4: 00000000000006e0
[ 3323.071028] DR0: 0000000000698000 DR1: 0000000000698000 DR2: 0000000000698000
[ 3323.071028] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 3323.071028] Stack:
[ 3323.071028]  00000000000004de ffff88022e2139d0 ffff8800c26edcb8 ffff88021b7ef9a0
[ 3323.071028]  00007fa2e6800000 00007fa300000000 ffff8800c26edde8 00007fa2ffffffff
[ 3323.071028]  ffff8800c26edd48 ffffffff812800c6 ffffea0008454540 00007fa2e6a00000
[ 3323.071028] Call Trace:
[ 3323.071028]  [<ffffffff812800c6>] unmap_page_range+0x2c6/0x410
[ 3323.071028]  [<ffffffff81280301>] unmap_single_vma+0xf1/0x110
[ 3323.071028]  [<ffffffff81280381>] unmap_vmas+0x61/0xa0
[ 3323.071028]  [<ffffffff812875e0>] exit_mmap+0xd0/0x170
[ 3323.071028]  [<ffffffff811387a7>] mmput+0x77/0xe0
[ 3323.071028]  [<ffffffff8113c80d>] exit_mm+0x18d/0x1a0
[ 3323.071028]  [<ffffffff811ecea5>] ? acct_collect+0x175/0x1b0
[ 3323.071028]  [<ffffffff8113ec1a>] do_exit+0x26a/0x510
[ 3323.071028]  [<ffffffff8113ef61>] do_group_exit+0xa1/0xe0
[ 3323.071028]  [<ffffffff8113efb2>] SyS_exit_group+0x12/0x20
[ 3323.071028]  [<ffffffff8439f720>] tracesys+0xdd/0xe2
[ 3323.071028] Code: 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 81 80 60 03 00 00 00 fe ff ff 49 8b 45 00 f6 c4 40 75 18 31 f6 4c 89 ef e8 f6 1f f9 ff <0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 ff 48
[ 3323.071028] RIP  [<ffffffff812c083a>] zap_huge_pmd+0x17a/0x200
[ 3323.071028]  RSP <ffff8800c26edc78>

Thanks,
Sasha

Sasha Levin

author

2014-04-08 20:56 UTC #4 lore raw

Quoted 51 lines · Sasha Levin

Quoted 7 lines · Sasha Levin

Quoted 6 lines · Kirill A. Shutemov
Quoted 5 lines · Sasha Levin
Quoted 5 lines
Hi all,
While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled on the following (now with pretty line numbers!) spew:

Quoted 7 lines

Quoted 3 lines
Quoted 1 line
Quoted 1 line
[  746.125099] kernel BUG at mm/huge_memory.c:1371!
It "VM_BUG_ON_PAGE(!PageHead(page), page);", correct? I don't see dump_page() output.
Right. However, I'm not seeing the dump_page() output in the log.
I see that dump_page() has been modified not long ago, I'm looking into it.

Alright, here we go:

[ 3323.062742] page:ffffea00080f0000 count:3 mapcount:0 mapping:ffff8802292ee0e1 index:0x7fa2e6800
[ 3323.065978] page flags: 0x16fffff80090018(uptodate|dirty|swapcache|swapbacked)
[ 3323.068535] ------------[ cut here ]------------
[ 3323.069669] kernel BUG at mm/huge_memory.c:1371!
[ 3323.070961] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 3323.071028] Dumping ftrace buffer:
[ 3323.071028]    (ftrace buffer empty)
[ 3323.071028] Modules linked in:
[ 3323.071028] CPU: 101 PID: 48284 Comm: trinity-c101 Tainted: G        W 3.14.0-rc4-next-20140228-sasha-00011-g4077c67 #25
[ 3323.071028] task: ffff8800c2718000 ti: ffff8800c26ec000 task.ti: ffff8800c26ec000
[ 3323.071028] RIP: 0010:[<ffffffff812c083a>]  [<ffffffff812c083a>] zap_huge_pmd+0x17a/0x200
[ 3323.071028] RSP: 0018:ffff8800c26edc78  EFLAGS: 00010246
[ 3323.071028] RAX: ffff88022febc000 RBX: ffff8800c26edde8 RCX: 0000000000000040
[ 3323.071028] RDX: 0000000000000000 RSI: ffff8800c2718cc0 RDI: 000000000203c000
[ 3323.071028] RBP: ffff8800c26edcb8 R08: 0000000000000000 R09: 0000000000000000
[ 3323.071028] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0008b9e240
[ 3323.071028] R13: ffffea00080f0000 R14: 00007fa2e6800000 R15: 00007fa2ffffffff
[ 3323.071028] FS:  00007fa31e1b8700(0000) GS:ffff880230600000(0000) knlGS:0000000000000000
[ 3323.071028] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3323.071028] CR2: 00007fa31e1e8990 CR3: 0000000005c25000 CR4: 00000000000006e0
[ 3323.071028] DR0: 0000000000698000 DR1: 0000000000698000 DR2: 0000000000698000
[ 3323.071028] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 3323.071028] Stack:
[ 3323.071028]  00000000000004de ffff88022e2139d0 ffff8800c26edcb8 ffff88021b7ef9a0
[ 3323.071028]  00007fa2e6800000 00007fa300000000 ffff8800c26edde8 00007fa2ffffffff
[ 3323.071028]  ffff8800c26edd48 ffffffff812800c6 ffffea0008454540 00007fa2e6a00000
[ 3323.071028] Call Trace:
[ 3323.071028]  [<ffffffff812800c6>] unmap_page_range+0x2c6/0x410
[ 3323.071028]  [<ffffffff81280301>] unmap_single_vma+0xf1/0x110
[ 3323.071028]  [<ffffffff81280381>] unmap_vmas+0x61/0xa0
[ 3323.071028]  [<ffffffff812875e0>] exit_mmap+0xd0/0x170
[ 3323.071028]  [<ffffffff811387a7>] mmput+0x77/0xe0
[ 3323.071028]  [<ffffffff8113c80d>] exit_mm+0x18d/0x1a0

Quoted 8 lines

[ 3323.071028]  [<ffffffff811ecea5>] ? acct_collect+0x175/0x1b0
[ 3323.071028]  [<ffffffff8113ec1a>] do_exit+0x26a/0x510
[ 3323.071028]  [<ffffffff8113ef61>] do_group_exit+0xa1/0xe0
[ 3323.071028]  [<ffffffff8113efb2>] SyS_exit_group+0x12/0x20
[ 3323.071028]  [<ffffffff8439f720>] tracesys+0xdd/0xe2
[ 3323.071028] Code: 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 81 80 60 03 00 00 00 fe ff ff 49 8b 45 00 f6 c4 40 75 18 31 f6 4c 89 ef e8 f6 1f f9 ff <0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 ff 48
[ 3323.071028] RIP  [<ffffffff812c083a>] zap_huge_pmd+0x17a/0x200
[ 3323.071028]  RSP <ffff8800c26edc78>

This is still happening in -next. Anything else I can provide that'll be useful?

Thanks,
Sasha

Kirill A. Shutemov

2014-04-10 10:37 UTC #5 lore raw

Quoted 61 lines · Sasha Levin

Quoted 51 lines · Sasha Levin

Quoted 7 lines · Sasha Levin

Quoted 6 lines · Kirill A. Shutemov
Quoted 5 lines · Sasha Levin
Quoted 5 lines
Hi all,
While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled on the following (now with pretty line numbers!) spew:

Quoted 7 lines

Quoted 3 lines
Quoted 1 line
Quoted 1 line
[  746.125099] kernel BUG at mm/huge_memory.c:1371!
It "VM_BUG_ON_PAGE(!PageHead(page), page);", correct? I don't see dump_page() output.
Right. However, I'm not seeing the dump_page() output in the log.
I see that dump_page() has been modified not long ago, I'm looking into it.

Alright, here we go:

[ 3323.062742] page:ffffea00080f0000 count:3 mapcount:0 mapping:ffff8802292ee0e1 index:0x7fa2e6800
[ 3323.065978] page flags: 0x16fffff80090018(uptodate|dirty|swapcache|swapbacked)
[ 3323.068535] ------------[ cut here ]------------
[ 3323.069669] kernel BUG at mm/huge_memory.c:1371!
[ 3323.070961] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 3323.071028] Dumping ftrace buffer:
[ 3323.071028]    (ftrace buffer empty)
[ 3323.071028] Modules linked in:
[ 3323.071028] CPU: 101 PID: 48284 Comm: trinity-c101 Tainted: G        W 3.14.0-rc4-next-20140228-sasha-00011-g4077c67 #25
[ 3323.071028] task: ffff8800c2718000 ti: ffff8800c26ec000 task.ti: ffff8800c26ec000
[ 3323.071028] RIP: 0010:[<ffffffff812c083a>]  [<ffffffff812c083a>] zap_huge_pmd+0x17a/0x200
[ 3323.071028] RSP: 0018:ffff8800c26edc78  EFLAGS: 00010246
[ 3323.071028] RAX: ffff88022febc000 RBX: ffff8800c26edde8 RCX: 0000000000000040
[ 3323.071028] RDX: 0000000000000000 RSI: ffff8800c2718cc0 RDI: 000000000203c000
[ 3323.071028] RBP: ffff8800c26edcb8 R08: 0000000000000000 R09: 0000000000000000
[ 3323.071028] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0008b9e240
[ 3323.071028] R13: ffffea00080f0000 R14: 00007fa2e6800000 R15: 00007fa2ffffffff
[ 3323.071028] FS:  00007fa31e1b8700(0000) GS:ffff880230600000(0000) knlGS:0000000000000000
[ 3323.071028] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3323.071028] CR2: 00007fa31e1e8990 CR3: 0000000005c25000 CR4: 00000000000006e0
[ 3323.071028] DR0: 0000000000698000 DR1: 0000000000698000 DR2: 0000000000698000
[ 3323.071028] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 3323.071028] Stack:
[ 3323.071028]  00000000000004de ffff88022e2139d0 ffff8800c26edcb8 ffff88021b7ef9a0
[ 3323.071028]  00007fa2e6800000 00007fa300000000 ffff8800c26edde8 00007fa2ffffffff
[ 3323.071028]  ffff8800c26edd48 ffffffff812800c6 ffffea0008454540 00007fa2e6a00000
[ 3323.071028] Call Trace:
[ 3323.071028]  [<ffffffff812800c6>] unmap_page_range+0x2c6/0x410
[ 3323.071028]  [<ffffffff81280301>] unmap_single_vma+0xf1/0x110
[ 3323.071028]  [<ffffffff81280381>] unmap_vmas+0x61/0xa0
[ 3323.071028]  [<ffffffff812875e0>] exit_mmap+0xd0/0x170
[ 3323.071028]  [<ffffffff811387a7>] mmput+0x77/0xe0
[ 3323.071028]  [<ffffffff8113c80d>] exit_mm+0x18d/0x1a0

Quoted 8 lines

[ 3323.071028]  [<ffffffff811ecea5>] ? acct_collect+0x175/0x1b0
[ 3323.071028]  [<ffffffff8113ec1a>] do_exit+0x26a/0x510
[ 3323.071028]  [<ffffffff8113ef61>] do_group_exit+0xa1/0xe0
[ 3323.071028]  [<ffffffff8113efb2>] SyS_exit_group+0x12/0x20
[ 3323.071028]  [<ffffffff8439f720>] tracesys+0xdd/0xe2
[ 3323.071028] Code: 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 81 80 60 03 00 00 00 fe ff ff 49 8b 45 00 f6 c4 40 75 18 31 f6 4c 89 ef e8 f6 1f f9 ff <0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 ff 48
[ 3323.071028] RIP  [<ffffffff812c083a>] zap_huge_pmd+0x17a/0x200
[ 3323.071028]  RSP <ffff8800c26edc78>

Quoted 1 line

This is still happening in -next. Anything else I can provide that'll be useful?

I don't know... :(

One theory I have is that the root cause of the bug is the same as with mm/huge_memory.c:1829 bug. If the compound page has been split but we miss the vma where PMD should be split, then we could see the effect. It could happend due anon_vma_interval_tree_foreach() vs. anon_vma_interval_tree_insert() race or something else.

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 Kirill A. Shutemov