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

kernel BUG at include/linux/mm.h:LINE! (6)
Status: upstream: reported C repro on 2020/04/19 15:28
Reported-by: syzbot+a923008018a2d298247b@syzkaller.appspotmail.com
First crash: 551d, last: 315d

Cause bisection: failed (bisect log)

Fix bisection: failed (bisect log)

similar bugs (7):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	kernel BUG at include/linux/mm.h:LINE! (3)	C			14	964d	964d	0/22	closed as invalid on 2019/02/27 20:54
linux-4.19	kernel BUG at include/linux/mm.h:LINE!	C			135	10h37m	915d	0/1	upstream: reported C repro on 2019/04/17 12:33
upstream	kernel BUG at include/linux/mm.h:LINE!	syz			68	1229d	1266d	6/22	fixed on 2018/06/07 13:52
upstream	kernel BUG at include/linux/mm.h:LINE! (2)	C			1009	965d	1228d	12/22	fixed on 2019/02/26 22:09
upstream	kernel BUG at include/linux/mm.h:LINE! (5)	C	done	done	129	888d	959d	16/22	fixed on 2020/01/08 01:07
linux-4.14	kernel BUG at include/linux/mm.h:LINE!				1	678d	678d	0/1	auto-closed as invalid on 2020/04/08 20:20
upstream	kernel BUG at include/linux/mm.h:LINE! (4)				2	962d	961d	0/22	closed as invalid on 2019/03/02 20:05

Sample crash report:

raw: 00fff00000000000 dead000000000100 ffffea0000993b40 0000000000000000
raw: 0000000000000000 ffff88801f05ac00 00000001fffffbff 0000000000000000
page dumped because: VM_BUG_ON_PAGE(page->pmd_huge_pte)
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:2268!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8784 Comm: syz-executor012 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pmd_ptlock_free include/linux/mm.h:2268 [inline]
RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2307 [inline]
RIP: 0010:___pmd_free_tlb+0x128/0x170 arch/x86/mm/pgtable.c:72
Code: 3f 00 48 89 df 48 89 ee e8 e5 d9 fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 27 61 3f 00 48 c7 c6 20 c1 48 89 48 89 ef e8 c8 44 6f 00 <0f> 0b e8 11 61 3f 00 48 c7 c6 80 c0 48 89 48 89 ef e8 b2 44 6f 00
RSP: 0018:ffffc90001df7908 EFLAGS: 00010292
RAX: 0000000000000000 RBX: ffffc90001df7a60 RCX: ffffffff88ae76f2
RDX: ffff8880145a4340 RSI: ffffffff88ae7741 RDI: ffffea00009dceb8
RBP: ffffea00009dce80 R08: 0000000000000037 R09: ffff8880b9e30627
R10: ffffffffffffffff R11: 0000000000000000 R12: ffff88802773a000
R13: ffffc90001df7a60 R14: ffff88802773b000 R15: 00000000211fffff
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faaaa271db8 CR3: 000000001c071000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __pmd_free_tlb arch/x86/include/asm/pgalloc.h:95 [inline]
 free_pmd_range mm/memory.c:254 [inline]
 free_pud_range mm/memory.c:272 [inline]
 free_p4d_range mm/memory.c:306 [inline]
 free_pgd_range+0x9c0/0xc00 mm/memory.c:386
 free_pgtables+0x230/0x2f0 mm/memory.c:418
 exit_mmap+0x2c0/0x530 mm/mmap.c:3221
 __mmput+0x122/0x470 kernel/fork.c:1079
 mmput+0x53/0x60 kernel/fork.c:1100
 exit_mm kernel/exit.c:486 [inline]
 do_exit+0xa72/0x29b0 kernel/exit.c:796
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x42a/0x1f10 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x447b99
Code: Unable to access opcode bytes at RIP 0x447b6f.
RSP: 002b:00007faaaa292db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006e39c8 RCX: 0000000000447b99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006e39c8
RBP: 00000000006e39c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e39cc
R13: 00007ffca9e785af R14: 00007faaaa2939c0 R15: 20c49ba5e353f7cf
Modules linked in:
---[ end trace 3adfc88612f04681 ]---
RIP: 0010:pmd_ptlock_free include/linux/mm.h:2268 [inline]
RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2307 [inline]
RIP: 0010:___pmd_free_tlb+0x128/0x170 arch/x86/mm/pgtable.c:72
Code: 3f 00 48 89 df 48 89 ee e8 e5 d9 fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 27 61 3f 00 48 c7 c6 20 c1 48 89 48 89 ef e8 c8 44 6f 00 <0f> 0b e8 11 61 3f 00 48 c7 c6 80 c0 48 89 48 89 ef e8 b2 44 6f 00
RSP: 0018:ffffc90001df7908 EFLAGS: 00010292
RAX: 0000000000000000 RBX: ffffc90001df7a60 RCX: ffffffff88ae76f2
RDX: ffff8880145a4340 RSI: ffffffff88ae7741 RDI: ffffea00009dceb8
RBP: ffffea00009dce80 R08: 0000000000000037 R09: ffff8880b9e30627
R10: ffffffffffffffff R11: 0000000000000000 R12: ffff88802773a000
R13: ffffc90001df7a60 R14: ffff88802773b000 R15: 00000000211fffff
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000180 CR3: 00000000132fa000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (8):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kasan-gce-selinux-root	2020/12/07 17:28	upstream	0477e9288185	1190297f	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/09/28 07:38	upstream	16bc1d5432eb	5dd8aee8	.config	log	report	syz	C
ci-upstream-kasan-gce-386	2020/09/28 07:28	upstream	16bc1d5432eb	5dd8aee8	.config	log	report	syz	C
ci-upstream-kasan-gce-386	2020/09/26 03:20	upstream	171d4ff79f96	4a006f63	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/01 00:15	linux-next	c6b11acc5f85	78d50c1d	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/07/02 18:18	upstream	cd77006e01b3	bed10395	.config	log	report
ci-upstream-kasan-gce-root	2020/05/31 08:14	upstream	ffeb595d8481	6f3e1c7c	.config	log	report
ci-upstream-kasan-gce	2020/04/15 15:13	upstream	8632e9b5645b	3f3c5574	.config	log	report