kernel BUG at include/linux/mm.h:LINE! (6)

kernel BUG at include/linux/mm.h:LINE! (6)
Status: upstream: reported on 2020/04/19 15:28
Reported-by: syzbot+a923008018a2d298247b@syzkaller.appspotmail.com
First crash: 114d, last: 36d

similar bugs (7):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	kernel BUG at include/linux/mm.h:LINE! (3)	C		14	528d	527d	0/17	closed as invalid on 2019/02/27 20:54
linux-4.19	kernel BUG at include/linux/mm.h:LINE!	C		21	19d	478d	0/1	upstream: reported C repro on 2019/04/17 12:33
upstream	kernel BUG at include/linux/mm.h:LINE!	syz		68	792d	829d	6/17	fixed on 2018/06/07 13:52
upstream	kernel BUG at include/linux/mm.h:LINE! (2)	C		1009	528d	791d	12/17	fixed on 2019/02/26 22:09
upstream	kernel BUG at include/linux/mm.h:LINE! (5)	C	cause+fix	129	452d	522d	16/17	fixed on 2020/01/08 01:07
linux-4.14	kernel BUG at include/linux/mm.h:LINE!			1	241d	241d	0/1	auto-closed as invalid on 2020/04/08 20:20
upstream	kernel BUG at include/linux/mm.h:LINE! (4)			2	525d	524d	0/17	closed as invalid on 2019/03/02 20:05

Sample crash report:

raw: 0000000000000000 ffff888042abc960 00000001ffffffff 0000000000000000
page dumped because: VM_BUG_ON_PAGE(page->pmd_huge_pte)
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:2285!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 16462 Comm: syz-executor.4 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2285 [inline]
RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2282 [inline]
RIP: 0010:___pmd_free_tlb+0x108/0x140 arch/x86/mm/pgtable.c:72
Code: ee e8 dc 92 fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 5e 87 3f 00 0f 0b e8 57 87 3f 00 48 c7 c6 c0 fa 48 88 48 89 ef e8 d8 2f 6d 00 <0f> 0b e8 41 87 3f 00 0f 0b 48 c7 c7 00 e1 b4 89 e8 b3 dc 7e 00 e9
RSP: 0018:ffffc900053178f8 EFLAGS: 00010296
RAX: 0000000000000000 RBX: 0000000000000110 RCX: ffffffff81a17049
RDX: ffff88808de6a180 RSI: ffffffff81a17098 RDI: ffffea0000004438
RBP: ffffea0000004400 R08: 0000000000000037 R09: ffff8880ae720fcb
R10: ffffffffffffffff R11: 0000000000000000 R12: ffffc90005317a58
R13: ffff888000110000 R14: 0000000021000fff R15: 0000000000000000
FS:  00007ffb77a25700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005611adfd99a7 CR3: 000000009a613000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __pmd_free_tlb arch/x86/include/asm/pgalloc.h:118 [inline]
 free_pmd_range mm/memory.c:251 [inline]
 free_pud_range mm/memory.c:269 [inline]
 free_p4d_range mm/memory.c:303 [inline]
 free_pgd_range+0xa3f/0xf90 mm/memory.c:383
 free_pgtables+0x230/0x2f0 mm/memory.c:415
 exit_mmap+0x2c0/0x510 mm/mmap.c:3151
 __mmput+0x122/0x470 kernel/fork.c:1093
 mmput+0x53/0x60 kernel/fork.c:1114
 exit_mm kernel/exit.c:482 [inline]
 do_exit+0xa8f/0x2a40 kernel/exit.c:792
 do_group_exit+0x125/0x310 kernel/exit.c:903
 get_signal+0x428/0x1fc0 kernel/signal.c:2739
 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline]
 __prepare_exit_to_usermode+0x156/0x1f0 arch/x86/entry/common.c:246
 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007ffb77a24cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000078bf08 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bf08
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffd499bb34f R14: 00007ffb77a259c0 R15: 000000000078bf0c
Modules linked in:
---[ end trace 731cf08682b945c1 ]---
RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2285 [inline]
RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2282 [inline]
RIP: 0010:___pmd_free_tlb+0x108/0x140 arch/x86/mm/pgtable.c:72
Code: ee e8 dc 92 fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 5e 87 3f 00 0f 0b e8 57 87 3f 00 48 c7 c6 c0 fa 48 88 48 89 ef e8 d8 2f 6d 00 <0f> 0b e8 41 87 3f 00 0f 0b 48 c7 c7 00 e1 b4 89 e8 b3 dc 7e 00 e9
RSP: 0018:ffffc900053178f8 EFLAGS: 00010296
RAX: 0000000000000000 RBX: 0000000000000110 RCX: ffffffff81a17049
RDX: ffff88808de6a180 RSI: ffffffff81a17098 RDI: ffffea0000004438
RBP: ffffea0000004400 R08: 0000000000000037 R09: ffff8880ae720fcb
R10: ffffffffffffffff R11: 0000000000000000 R12: ffffc90005317a58
R13: ffff888000110000 R14: 0000000021000fff R15: 0000000000000000
FS:  00007ffb77a25700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe4b9ec800 CR3: 000000008fe00000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce-selinux-root	2020/07/02 18:18	upstream	cd77006e	bed10395	.config	log	report	bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org
ci-upstream-kasan-gce-root	2020/05/31 08:14	upstream	ffeb595d	6f3e1c7c	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci-upstream-kasan-gce	2020/04/15 15:13	upstream	8632e9b5	3f3c5574	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org