kernel BUG at include/linux/swapops.h:LINE!

kernel BUG at include/linux/swapops.h:LINE!
Status: upstream: reported syz repro on 2020/05/30 17:05
Reported-by: syzbot+c48f34012b06c4ac67dd@syzkaller.appspotmail.com
First crash: 278d, last: 155d

Cause bisection: failed (bisect log)

Fix bisection: failed (bisect log)

Sample crash report:

------------[ cut here ]------------
kernel BUG at include/linux/swapops.h:197!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 11909 Comm: syz-executor.2 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:migration_entry_to_page include/linux/swapops.h:197 [inline]
RIP: 0010:migration_entry_to_page include/linux/swapops.h:190 [inline]
RIP: 0010:pmd_migration_entry_wait+0x493/0x520 mm/migrate.c:368
Code: 4d 8d 66 ff e9 1f fe ff ff e8 39 20 bf ff 49 8d 5f ff e9 58 fe ff ff e8 2b 20 bf ff 4d 8d 66 ff e9 a9 fe ff ff e8 1d 20 bf ff <0f> 0b e8 16 20 bf ff 0f 0b e8 0f 20 bf ff 4c 8d 65 ff eb a7 48 89
RSP: 0000:ffffc900034b7d30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81b49b54
RDX: ffff8880929c2500 RSI: ffffffff81b49c73 RDI: 0000000000000001
RBP: ffffea00084e8080 R08: 0000000000000000 R09: ffffea00084e8087
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00084e8080
R13: ffff8880a33d1c00 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000e04940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000700 CR3: 0000000214866000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __handle_mm_fault mm/memory.c:4339 [inline]
 handle_mm_fault+0x2220/0x43f0 mm/memory.c:4394
 do_user_addr_fault+0x5a2/0xd00 arch/x86/mm/fault.c:1295
 handle_page_fault arch/x86/mm/fault.c:1365 [inline]
 exc_page_fault+0xab/0x170 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:542
RIP: 0033:0x400604
Code: Bad RIP value.
RSP: 002b:00007ffe39bfd540 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000020000700 RDI: 0000000000000001
RBP: 0000000000790198 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffe39bfd650 R11: 0000000000000246 R12: 00000000007901a0
R13: 0000000000000000 R14: fffffffffffffffe R15: 000000000078bf0c
Modules linked in:
---[ end trace 4e96b38f190e325d ]---
RIP: 0010:migration_entry_to_page include/linux/swapops.h:197 [inline]
RIP: 0010:migration_entry_to_page include/linux/swapops.h:190 [inline]
RIP: 0010:pmd_migration_entry_wait+0x493/0x520 mm/migrate.c:368
Code: 4d 8d 66 ff e9 1f fe ff ff e8 39 20 bf ff 49 8d 5f ff e9 58 fe ff ff e8 2b 20 bf ff 4d 8d 66 ff e9 a9 fe ff ff e8 1d 20 bf ff <0f> 0b e8 16 20 bf ff 0f 0b e8 0f 20 bf ff 4c 8d 65 ff eb a7 48 89
RSP: 0000:ffffc900034b7d30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81b49b54
RDX: ffff8880929c2500 RSI: ffffffff81b49c73 RDI: 0000000000000001
RBP: ffffea00084e8080 R08: 0000000000000000 R09: ffffea00084e8087
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00084e8080
R13: ffff8880a33d1c00 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000e04940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000700 CR3: 0000000214866000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (7):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info
ci-upstream-kasan-gce-selinux-root	2020/07/24 07:55	upstream	d15be546	70c104a1	.config	log	report	syz
ci-upstream-kasan-gce-386	2020/07/21 15:14	upstream	4fa640dc	d88894e6	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2020/07/20 08:08	linux-next	4c43049f	9c812472	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2020/07/19 21:09	linux-next	4c43049f	9c812472	.config	log	report	syz
ci-upstream-kasan-gce-root	2020/05/26 12:29	upstream	9cb1fd0e	8ca3b7d2	.config	log	report
ci-upstream-kasan-gce-386	2020/09/26 03:01	upstream	171d4ff7	4a006f63	.config	log	report		info
ci-upstream-linux-next-kasan-gce-root	2020/07/19 16:31	linux-next	4c43049f	9c812472	.config	log	report