From: Andrew Morton <akpm@linux-foundation.org>
To: syzbot <syzbot+acf65ca584991f3cc447@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
llvm@lists.linux.dev, mike.kravetz@oracle.com, nathan@kernel.org,
ndesaulniers@google.com, syzkaller-bugs@googlegroups.com,
trix@redhat.com, Matthew Wilcox <willy@infradead.org>
Subject: Re: [syzbot] WARNING in follow_hugetlb_page
Date: Fri, 13 May 2022 10:26:17 -0700 [thread overview]
Message-ID: <20220513102617.c464c4f566052838e911a3ec@linux-foundation.org> (raw)
In-Reply-To: <00000000000077377c05dee75f63@google.com>
On Fri, 13 May 2022 09:43:24 -0700 syzbot <syzbot+acf65ca584991f3cc447@syzkaller.appspotmail.com> wrote:
> syzbot has found a reproducer for the following issue on:
Thanks.
> HEAD commit: 1e1b28b936ae Add linux-next specific files for 20220513
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=174ae715f00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=e4eb3c0c4b289571
> dashboard link: https://syzkaller.appspot.com/bug?extid=acf65ca584991f3cc447
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11531766f00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ce5a9ef00000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+acf65ca584991f3cc447@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 3611 at mm/hugetlb.c:6250 follow_hugetlb_page+0x1326/0x1c80 mm/hugetlb.c:6250
The try_grab_folio() added by 822951d84684d ("mm/hugetlb: Use
try_grab_folio() instead of try_grab_compound_head()"). That commit
has been there over a month so I guess it's something else. Does
someone have the time to bisect?
> Modules linked in:
> CPU: 1 PID: 3611 Comm: syz-executor603 Not tainted 5.18.0-rc6-next-20220513-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:follow_hugetlb_page+0x1326/0x1c80 mm/hugetlb.c:6250
> Code: 89 44 24 70 e8 2b 1d b7 ff 48 8b 44 24 70 48 85 c0 0f 84 f1 07 00 00 e8 88 1a b7 ff 48 83 ed 01 e9 09 fb ff ff e8 7a 1a b7 ff <0f> 0b 48 8b 7c 24 30 bb f4 ff ff ff e8 69 74 b8 07 4c 8b a4 24 b8
> RSP: 0018:ffffc90002f6f7e0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff88801bdd4e00 RCX: 0000000000000000
> RDX: ffff88801e4e3a80 RSI: ffffffff81c38f76 RDI: 0000000000000003
> RBP: ffffea0001fe8680 R08: 0000000000000000 R09: 0000000000000003
> R10: ffffffff81b128fb R11: 0000000000000008 R12: 000000000000001a
> R13: ffff88801bdd4e00 R14: ffff88801bdd5600 R15: 0000000000000019
> FS: 0000555556ad2300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000458 CR3: 000000001e850000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> __get_user_pages+0x27a/0xfa0 mm/gup.c:1146
> __get_user_pages_locked mm/gup.c:1365 [inline]
> __gup_longterm_locked+0x1d5/0xfe0 mm/gup.c:1985
> pin_user_pages+0x8e/0xe0 mm/gup.c:3118
> io_sqe_buffer_register+0x254/0x1710 fs/io_uring.c:10537
> io_sqe_buffers_register.cold+0x28e/0x443 fs/io_uring.c:10664
> __io_uring_register fs/io_uring.c:12682 [inline]
> __do_sys_io_uring_register+0xd21/0x1930 fs/io_uring.c:12816
> 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+0x46/0xb0
> RIP: 0033:0x7f5f42760cc9
> Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fffc3407aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
> RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f5f42760cc9
> RDX: 0000000020000380 RSI: 0000000000000000 RDI: 0000000000000004
> RBP: 00007f5f42724e70 R08: 0000000010000000 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000246 R12: 00007f5f42724f00
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> </TASK>
next prev parent reply other threads:[~2022-05-13 17:26 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-13 9:03 [syzbot] WARNING in follow_hugetlb_page syzbot
2022-05-13 16:43 ` syzbot
2022-05-13 17:26 ` Andrew Morton [this message]
2022-05-13 18:09 ` Mike Kravetz
2022-05-13 22:48 ` Mike Kravetz
2022-05-13 23:19 ` Andrew Morton
2022-05-13 23:54 ` Minchan Kim
2022-05-14 0:09 ` John Hubbard
2022-05-14 0:26 ` Minchan Kim
2022-05-14 0:56 ` John Hubbard
2022-05-14 1:16 ` John Hubbard
2022-05-17 3:37 ` Mike Kravetz
2022-05-18 7:12 ` John Hubbard
2022-05-20 22:19 ` Minchan Kim
2022-05-20 22:56 ` John Hubbard
2022-05-20 23:25 ` Minchan Kim
2022-05-20 23:31 ` Mike Kravetz
2022-05-20 23:43 ` Minchan Kim
2022-05-21 0:04 ` Mike Kravetz
2022-05-21 15:24 ` Minchan Kim
2022-05-21 15:51 ` David Hildenbrand
2022-05-21 16:36 ` Minchan Kim
2022-05-21 16:46 ` David Hildenbrand
2022-05-21 18:25 ` Minchan Kim
2022-05-21 23:50 ` Mike Kravetz
2022-05-14 0:18 ` Andrew Morton
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