kernel BUG in __page

kernel BUG in __page_mapcount
Status: upstream: reported syz repro on 2021/05/31 00:53
Reported-by: syzbot+1f52b3a18d5633fa7f82@syzkaller.appspotmail.com
First crash: 146d, last: 14h53m

Cause bisection: failed (bisect log)

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	kernel BUG at include/linux/page-flags.h:LINE!				4	946d	1127d	0/22	auto-closed as invalid on 2019/09/14 22:37

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/06/07 15:13	19m	jannh@google.com	patch	git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 7ac3a1c1	OK

Sample crash report:

 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a60 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2160 kernel/signal.c:2808
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
------------[ cut here ]------------
kernel BUG at include/linux/page-flags.h:695!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 11807 Comm: syz-executor.2 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:PageDoubleMap include/linux/page-flags.h:695 [inline]
RIP: 0010:__page_mapcount+0x2d2/0x350 mm/util.c:728
Code: e8 23 c9 d1 ff 48 c7 c6 40 55 95 89 48 89 ef e8 e4 57 04 00 0f 0b e8 0d c9 d1 ff 48 c7 c6 a0 55 95 89 48 89 ef e8 ce 57 04 00 <0f> 0b e8 f7 c8 d1 ff 48 c7 c6 e0 55 95 89 4c 89 f7 e8 b8 57 04 00
RSP: 0018:ffffc9000b44f568 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888028254240 RSI: ffffffff81a2f7d2 RDI: 0000000000000003
RBP: ffffea00017394c0 R08: 0000000000000024 R09: 00000000ffffffff
R10: ffffffff88e9e6a8 R11: 00000000ffffffff R12: 00000000ffffffff
R13: 00000000ffffea00 R14: ffffc9000b44f938 R15: ffffea0001738000
FS:  00007fd1f83cf700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1f83ceff8 CR3: 0000000039a75000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 page_mapcount include/linux/mm.h:875 [inline]
 smaps_account+0x470/0xb30 fs/proc/task_mmu.c:467
 smaps_pte_entry fs/proc/task_mmu.c:531 [inline]
 smaps_pte_range+0x60d/0x1390 fs/proc/task_mmu.c:594
 walk_pmd_range mm/pagewalk.c:128 [inline]
 walk_pud_range mm/pagewalk.c:205 [inline]
 walk_p4d_range mm/pagewalk.c:240 [inline]
 walk_pgd_range mm/pagewalk.c:277 [inline]
 __walk_page_range+0xe23/0x1ea0 mm/pagewalk.c:379
 walk_page_vma+0x277/0x350 mm/pagewalk.c:530
 smap_gather_stats.part.0+0x1e1/0x2d0 fs/proc/task_mmu.c:765
 smap_gather_stats fs/proc/task_mmu.c:735 [inline]
 show_smaps_rollup+0x325/0x9c0 fs/proc/task_mmu.c:868
 seq_read_iter+0x4f6/0x1240 fs/seq_file.c:230
 seq_read+0x3dd/0x5b0 fs/seq_file.c:162
 do_loop_readv_writev fs/read_write.c:761 [inline]
 do_loop_readv_writev fs/read_write.c:748 [inline]
 do_iter_read+0x48e/0x6e0 fs/read_write.c:803
 vfs_readv+0xe5/0x150 fs/read_write.c:921
 do_preadv fs/read_write.c:1013 [inline]
 __do_sys_preadv fs/read_write.c:1063 [inline]
 __se_sys_preadv fs/read_write.c:1058 [inline]
 __x64_sys_preadv+0x231/0x310 fs/read_write.c:1058
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd1f83cf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000001 RSI: 0000000020000780 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff2aac209f R14: 00007fd1f83cf300 R15: 0000000000022000
Modules linked in:
---[ end trace aa1f1035361ec7a3 ]---
RIP: 0010:PageDoubleMap include/linux/page-flags.h:695 [inline]
RIP: 0010:__page_mapcount+0x2d2/0x350 mm/util.c:728
Code: e8 23 c9 d1 ff 48 c7 c6 40 55 95 89 48 89 ef e8 e4 57 04 00 0f 0b e8 0d c9 d1 ff 48 c7 c6 a0 55 95 89 48 89 ef e8 ce 57 04 00 <0f> 0b e8 f7 c8 d1 ff 48 c7 c6 e0 55 95 89 4c 89 f7 e8 b8 57 04 00
RSP: 0018:ffffc9000b44f568 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888028254240 RSI: ffffffff81a2f7d2 RDI: 0000000000000003
RBP: ffffea00017394c0 R08: 0000000000000024 R09: 00000000ffffffff
R10: ffffffff88e9e6a8 R11: 00000000ffffffff R12: 00000000ffffffff
R13: 00000000ffffea00 R14: ffffc9000b44f938 R15: ffffea0001738000
FS:  00007fd1f83cf700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1f83ceff8 CR3: 0000000039a75000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-smack-root	2021/06/26 08:02	upstream	b7050b242430	858ea628	.config	log	report	syz

Crashes (32):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Title
ci-upstream-kasan-gce-selinux-root	2021/07/29 08:13	upstream	4010a528219e	9a4781d4	.config	log	report	syz		kernel BUG in __page_mapcount
ci-upstream-kasan-gce-smack-root	2021/05/27 07:29	upstream	7ac3a1c1ae51	858ea628	.config	log	report	syz		kernel BUG in __page_mapcount
ci-upstream-kasan-gce	2021/10/12 16:03	upstream	fa5878760579	838e7e2c	.config	log	report		info	kernel BUG in __page_mapcount
ci-upstream-kasan-gce	2021/10/08 14:00	upstream	1da38549dd64	efe0f24d	.config	log	report		info	kernel BUG in __page_mapcount
ci-upstream-kasan-gce-root	2021/09/24 13:36	upstream	f9e36107ec70	8cac236e	.config	log	report		info	kernel BUG in __page_mapcount
ci-upstream-kasan-gce-selinux-root	2021/07/29 07:23	upstream	4010a528219e	9a4781d4	.config	log	report		info	kernel BUG in __page_mapcount
ci-upstream-kasan-gce-smack-root	2021/05/27 00:37	upstream	7ac3a1c1ae51	858ea628	.config	log	report		info	kernel BUG in __page_mapcount
ci-upstream-linux-next-kasan-gce-root	2021/10/19 20:00	linux-next	60e8840126bd	466b7db1	.config	log	report		info	kernel BUG in __page_mapcount
ci-upstream-kasan-gce-smack-root	2021/10/01 16:42	upstream	4de593fb965f	cc80db95	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-smack-root	2021/09/26 21:23	upstream	996148ee05d0	78494d16	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-smack-root	2021/09/20 16:29	upstream	e4e737bb5c17	af796c18	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-smack-root	2021/09/13 12:40	upstream	6880fa6c5660	3ce60af8	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-smack-root	2021/09/11 03:19	upstream	926de8c4326c	5ae8508a	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/09/05 22:27	upstream	0319b848b155	d236a457	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/08/26 19:49	upstream	73f3af7b4611	b318694d	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/08/23 10:40	upstream	e22ce8eb631b	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-selinux-root	2021/08/23 00:50	upstream	1bdc3d5be7e1	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-selinux-root	2021/08/23 00:23	upstream	1bdc3d5be7e1	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-smack-root	2021/08/21 07:22	upstream	fa54d366a6e4	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-selinux-root	2021/08/20 17:37	upstream	d992fe5318d8	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-selinux-root	2021/08/20 17:24	upstream	d992fe5318d8	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/08/20 15:29	upstream	d992fe5318d8	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-smack-root	2021/08/20 01:51	upstream	f87d64319e6f	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/08/19 18:33	upstream	d6d09a694205	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/08/19 17:37	upstream	d6d09a694205	b599f2fc	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/08/18 11:29	upstream	614cb2751d31	a2fe1cb5	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-root	2021/08/16 22:07	upstream	a2824f19e606	33c26cb7	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-selinux-root	2021/08/15 13:12	upstream	0aa78d17099b	2489ab88	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-selinux-root	2021/08/12 23:57	upstream	f8fbb47c6e86	3fd2ea69	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-kasan-gce-selinux-root	2021/08/10 11:20	upstream	9a73fa375d58	6972b106	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-linux-next-kasan-gce-root	2021/08/26 19:48	linux-next	88fac11862d3	b318694d	.config	log	report		info	kernel BUG in do_read_cache_page
ci-upstream-linux-next-kasan-gce-root	2021/07/08 03:14	linux-next	ee268dee405b	95793bce	.config	log	report		info	kernel BUG in do_read_cache_page